A resonance suppression design method for transmission tower pole and transmission tower pole

Abstract

The present invention provides a resonance suppression design method for transmission tower poles and transmission tower poles. The method comprises constructing a pole simulation member and a wind-breaking rib simulation member according to a preset scale ratio; simulating different arrangement modes of the wind-breaking rib simulation member on the pole simulation member to obtain a simulation result value corresponding to each arrangement mode, and the simulation result value comprises a test simulated wind acceleration; comparing the test simulated wind acceleration in the simulation result value corresponding to each arrangement mode, and determining the arrangement mode corresponding to the minimum test simulated wind acceleration as the target arrangement mode of the wind-breaking rib simulation member on the pole simulation member; converting and obtaining the actual arrangement height and arrangement length of the tower wind-breaking rib according to the target arrangement mode and the preset scale ratio. The transmission tower pole member comprises a spoiler shell and a tower wind-breaking rib manufactured by the above method. The present invention has the advantages of efficiently suppressing the vibration of the transmission tower pole member and ensuring the safety and reliability of the transmission tower.

Description

Technical Field

[0001] The present invention relates to the field of resonance suppression of transmission and transformation tower poles, and in particular to a resonance suppression design method for transmission and transformation tower poles and the transmission and transformation tower poles. Background Art

[0002] Transmission towers are overhead transmission and transformation lines that support conductors and lightning conductors. Transmission towers have the characteristics of bearing large loads, large structures, and large self-bearing capacity. Therefore, the transmission tower poles are mainly made of circular cross-section steel pipes. Circular cross-section steel pipe components have the advantages of reducing the wind load on the tower body, reducing the length of the poles, and ensuring the safety and stability of the transmission tower.

[0003] The transmission tower poles of the power transmission tower are slender components, especially the poles that tend to be arranged horizontally. When the wind speed is low, breeze vibrations will occur perpendicular to the wind direction (crosswind direction), which is characterized by a high frequency of occurrence under natural wind conditions. The amplitude of this breeze vibration is generally at the millimeter level. A single impact force does not cause structural damage to the transmission tower pole itself, but long-term vibration will cause fatigue damage to the pole. Common forms include: the pole tower bolts at the pole connection nodes loosen, causing the pole to fall off; the connecting plates connected at both ends of the pole are damaged, and local connecting plates may crack under long-term vibration, causing the connecting plates and the transmission tower poles to fall off. In addition, there is a vibration coupling effect between the transmission tower and the ground wire. The high-frequency vibration of the transmission tower pole at the hanging point will resonate with the high-order vibration of the conductor, affecting the normal operation of the ground wire vibration isolation device, and even affecting the service life of the vibration isolation device under long-term vibration. It can be seen that the breeze vibration phenomenon of the existing transmission and transformation tower poles occurs frequently, which has a huge impact on the overall durability and safety of the transmission and transformation towers, as well as the stable operation of the transmission and transformation lines. If not controlled, it will affect the normal operation of the entire power project.

[0004] To solve the above problems, the existing method is to adopt pneumatic measures to suppress vibration, which includes: setting a sleeve on the transmission tower pole and setting a tower wind-breaking rib on the sleeve. However, the above pneumatic measures are usually selected and installed based on human experience, which is highly subjective and cannot judge the degree of vibration suppression, resulting in that the vibration reduction effect is usually far from expectations; at the same time, it is difficult to manufacture and apply in large quantities based on experience, and pneumatic measures are usually processed and set after the transmission tower pole is processed or even installed on site, which has low installation efficiency, wastes manpower and economic costs, and leads to poor aesthetics and coordination of the transmission tower pole. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a resonance suppression design method for transmission and transformation tower poles and a transmission and transformation tower pole that can effectively suppress the vibration of transmission and transformation tower poles and ensure the safety and reliability of transmission and transformation tower poles.

[0006] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0007] A resonance suppression design method for a transmission and transformation tower pole, comprising:

[0008] Constructing a rod simulation part simulating a transmission tower rod according to a preset scale ratio, and a wind-breaking rib simulation part simulating a tower rod wind-breaking rib on a transmission tower rod, wherein the wind-breaking rib simulation part is arranged on the outer surface of the rod simulation part;

[0009] Simulate different arrangements of the wind-breaking rib simulation member on the rod simulation member to obtain simulation result values ​​corresponding to each arrangement, wherein the simulation result values ​​include test simulated wind acceleration, and each arrangement corresponds to a combination of different values ​​of two or more influencing factors of the wind-breaking rib simulation member, wherein the influencing factors include the arrangement height and arrangement length of the wind-breaking rib simulation member, and the test simulated wind acceleration is the acceleration of the rod simulation member under the test simulated wind;

[0010] Compare the test simulated wind accelerations in the simulation result values ​​corresponding to each arrangement mode, and determine the arrangement mode corresponding to the minimum test simulated wind acceleration as the target arrangement mode of the wind-breaking rib simulation member on the rod simulation member;

[0011] According to the target arrangement mode and the preset scale ratio, the actual arrangement height and arrangement length of the tower wind-breaking ribs are converted, and the tower wind-breaking ribs are arranged according to the actual arrangement height and arrangement length of the tower wind-breaking ribs, so as to achieve resonance suppression of the transmission and transformation tower.

[0012] As a further improvement of the above technical solution:

[0013] The rod simulation member is a tubular rod member, and the rod simulation member for simulating the transmission and transformation tower rod member and the wind-breaking rib simulation member for simulating the wind-breaking rib on the transmission and transformation tower rod member include:

[0014] Configuring configuration parameters of the rod simulation component, wherein the configuration parameters include the length, outer diameter, inner diameter, natural frequency and test simulation wind speed of the rod simulation component; the test simulation wind speed is the test vibration wind speed applied to the rod simulation component in the simulation scene;

[0015] The length, outer diameter and inner diameter of the rod simulation member are determined according to the length, outer diameter and inner diameter of the transmission and transformation tower rod to be simulated, and the preset scale ratio;

[0016] The natural frequency of the rod simulation component is calculated according to the length, outer diameter and inner diameter of the rod simulation component. The natural frequency of the rod simulation component includes the first-order natural frequency and the second-order and higher natural frequencies of the rod simulation component.

[0017] The test simulation wind speed of the rod simulation member is configured, including:

[0018] The natural frequency of the transmission and transformation tower pole is calculated according to the length, outer diameter and inner diameter of the transmission and transformation tower pole;

[0019] According to the first-order natural frequency and the second-order and above natural frequencies in the natural frequency of the transmission and transformation tower pole, the vortex-vibration initiation wind speed of the transmission and transformation tower pole when the pole vibrates at different orders is determined, and a target vortex-vibration initiation wind speed that is less than a preset safety wind speed is selected from the vortex-vibration initiation wind speeds of the transmission and transformation tower pole when the pole vibrates at each order, and the selected target vortex-vibration initiation wind speed is used as the simulated initiation wind speed of the transmission and transformation tower pole;

[0020] The test simulated wind speed of the pole simulation member is determined according to the simulated vibration wind speed of the transmission and transformation tower pole member and a preset wind speed ratio.

[0021] The calculation formula for the vortex vibration initiation wind speed of the transmission tower pole when the pole vibrates at different orders is:

[0022] ,

[0023] in, is the vortex-induced vibration wind speed of the transmission and transformation tower poles, is the outer diameter of the transmission tower pole, is the Stothal number; It represents the natural frequency of any order of the transmission tower pole, among which the first-order natural frequency of the transmission tower pole is and the second-order natural frequencies of the transmission tower components The calculation formulas are:

[0024] ,

[0025] ,

[0026] in, L is the length of the transmission tower pole, E is the elastic modulus of the transmission tower pole, is the density of the transmission tower poles, is the ratio of the inner and outer diameters of the transmission tower pole, A is the cross-sectional area of ​​the transmission tower pole, n is the order of vibration of the transmission tower pole, is the section inertia moment of the transmission tower pole in the vibration direction.

[0027] When constructing a rod simulation part simulating a transmission tower rod, and a wind-breaking rib simulation part simulating a tower rod wind-breaking rib on a transmission tower rod, it also includes constructing a support column simulation part and an adjustment clamp simulation part, wherein the support column simulation part is two support column simulation parts arranged opposite to each other perpendicular to the wind direction of the test simulated wind; the two ends of the rod simulation part are respectively installed horizontally or obliquely on the support column simulation part through an adjustment clamp simulation part;

[0028] The adjustable clamp simulation component includes a clamp body, an annular adjustment disk connected to the clamp body, and a rotating plate connected to the rod simulation component. The rotating plate is provided with an adjusting arc surface adapted to the annular outer surface of the annular adjustment disk. The rotating plate can rotate circumferentially relative to the annular adjustment disk when the rod simulation component adjusts its angle, and can be limited and fixed when the rod simulation component is adjusted to a preset angle.

[0029] Simulating different arrangements of the wind-breaking rib simulation member on the rod simulation member includes:

[0030] At least two first values ​​are configured for the arrangement height of the wind-breaking rib simulation member, at least two second values ​​are configured for the designated influencing factor of the wind-breaking rib simulation member, and at least two third values ​​are configured for the arrangement length of the wind-breaking rib simulation member, wherein the first value is proportional to the outer diameter of the rod simulation member, and the third value is proportional to the length of the rod simulation member, when the wind-breaking rib simulation member is a rectangular wind-breaking rib, the designated influencing factor is the arrangement quantity of the wind-breaking rib simulation member; when the wind-breaking rib simulation member is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member;

[0031] Selecting one of the first values, one of the second values, and one of the third values ​​from at least two of the first values, the second values, and the third values, respectively, to obtain a plurality of selection combinations, wherein at least one of the first values, the second values, and the third values ​​of different selection combinations is different;

[0032] Orthogonal tests are performed on multiple groups of the selected combinations to obtain optimized selected combinations, which are used as multiple arrangements of wind-breaking rib simulation members on the rod simulation members.

[0033] Simulating different arrangements of the wind-breaking rib simulation member on the rod simulation member includes:

[0034] According to different values ​​of the influencing factors, three arrangement mode sets are established, and the three arrangement mode sets respectively use the arrangement height of the wind-breaking rib simulation member, the arrangement length of the wind-breaking rib simulation member, and one of the designated influencing factors determined according to the shape of the wind-breaking rib simulation member as fixed influencing factors with unchanged values; each of the arrangement mode sets includes a plurality of horizontal groups, and the number of the horizontal groups is the number of values ​​of the fixed influencing factors; each of the horizontal groups includes a plurality of arrangement modes, and each arrangement mode of the same horizontal group has different values ​​of influencing factors except the fixed influencing factors, wherein when the wind-breaking rib simulation member is a rectangular wind-breaking rib, the designated influencing factor is the arrangement number of the wind-breaking rib simulation member; when the wind-breaking rib simulation member is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member;

[0035] Multi-factor variance analysis was used to conduct inter-group and intra-group variation of the horizontal groups in each layout set, as well as interactive variation analysis between layout sets, and the target influencing factors that have a significant impact on the experimental simulated wind acceleration were determined based on the analysis;

[0036] A linear relationship is obtained based on the degree of influence of the determined target influencing factor on the test simulated wind acceleration. The in-group sums of squares of different level groups are multiplied by the normalized coefficients of the corresponding target influencing factors. The level group with the smallest product under each influencing factor is selected as the preferred level group. The interaction variance coefficient is used to weight each preferred level group to form a linear relationship. The result value of the linear relationship within the minimum or preset error range is determined as the theoretical optimal arrangement of the wind-breaking rib simulation part on the rod simulation part, and is used as a variety of arrangement methods of the wind-breaking rib simulation part on the rod simulation part.

[0037] Simulate different arrangements of the wind-breaking rib simulation member on the rod simulation member to obtain simulation result values ​​corresponding to each arrangement, including:

[0038] A detection device is provided, wherein the detection device includes an acceleration detection member, wherein the acceleration detection member includes a first-order acceleration detection member provided at the axial center of the rod simulation member, and a second-order acceleration detection member provided at one-quarter or three-quarters of the axial direction of the rod simulation member;

[0039] The test simulated wind acceleration corresponding to each arrangement is obtained by using the detection device, wherein the test simulated wind acceleration includes the first-order vibration acceleration detected by the first-order acceleration detection component and the second-order vibration acceleration detected by the second-order acceleration detection component.

[0040] The detection device further comprises a wind speed detection member and / or a displacement detection member, wherein the wind speed detection member is arranged on the rod simulation member, and the wind speed detection member detects the simulated wind speed to obtain the corresponding wind speed when the rod simulation member starts to vibrate, stops vibrating and has the maximum vibration amplitude;

[0041] The displacement detection component is arranged on the leeward side of the rod simulation component, the displacement detection component is arranged at the axial center of the rod simulation component, and at one quarter or three quarters of the axial direction of the rod simulation component, and the displacement detection component is used to detect the first-order vibration displacement and the second-order vibration displacement of the rod simulation component for comparison with the experimental simulated wind acceleration.

[0042] A power transmission and transformation tower pole comprises a spoiler shell and a tower pole wind-breaking rib manufactured by adopting the above-mentioned resonance suppression design method for a power transmission and transformation tower pole, wherein the tower pole wind-breaking rib is arranged on the spoiler shell.

[0043] Compared with the prior art, the advantages of the present invention are:

[0044] The method of the present invention first constructs a rod simulation part and a wind-breaking rib simulation part according to a preset scale ratio, and forms an aeroelastic model with the wind-breaking rib simulation part as the basis for vibration reduction simulation; simulates different arrangements of the wind-breaking rib simulation part on the rod simulation part, obtains the test simulated wind acceleration corresponding to each arrangement, compares the test simulated wind acceleration corresponding to each arrangement, and determines the arrangement method corresponding to the minimum test simulated wind acceleration as the target arrangement method of the wind-breaking rib simulation part on the rod simulation part; according to the target arrangement method and the preset scale ratio, the arrangement height and arrangement length of the actual tower wind-breaking rib are converted to achieve the optimal arrangement of the tower wind-breaking rib on the transmission and transformation tower rod, thereby effectively avoiding the problem that the wind-breaking rib arrangement method is highly subjective and has a poor vibration reduction effect through experience-based selection, and maximally improves the resonance suppression effect of the transmission and transformation tower rod, and ensures the safety and reliability of the transmission and transformation tower rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0046] Figure 1 It is a flow chart of the resonance suppression design method of the transmission and transformation tower pole member of the present invention;

[0047] Figure 2 is a schematic diagram of the rod simulation member of the present invention in a simulation scene (the rod simulation member is in a horizontal state);

[0048] Figure 3 is a schematic diagram of the rod simulation member of the present invention in a simulation scene (different tilt states of the rod simulation member);

[0049] Figure 4Schematic diagram of the positional relationship between the wind-breaking rib simulation part and the rod simulation part of the present invention;

[0050] Figure 5 It is a three-dimensional structural schematic diagram of the adjusting clamp simulation component of the present invention;

[0051] Figure 6 This is a front view of the adjusting clamp simulation component of the present invention;

[0052] Figure 7 Schematic diagram of different end connection structures of the rod simulation member of the present invention;

[0053] Figure 8 It is a comparison diagram of the detection results of the displacement detection element and the acceleration detection element of the present invention;

[0054] Fig. 9 This is a comparison diagram of the effects of not using pneumatic measures and using pneumatic measures in Example 1;

[0055] Fig.10 It is a three-dimensional schematic diagram of a transmission and transformation tower pole member according to Embodiment 1 of the present invention;

[0056] Fig.11 It is a three-dimensional schematic diagram of a transmission and transformation tower pole member according to Embodiment 2 of the present invention;

[0057] Fig.12 This is a comparison diagram of the effects of not using pneumatic measures and using pneumatic measures in Example 2;

[0058] The symbols in the figure represent:

[0059] 1. Rod simulation part; 11. Single connecting plate; 12. U-shaped connecting plate; 13. Cross-shaped connecting plate; 2. Wind-breaking rib simulation part; 3. Support column simulation part; 4. Adjustment clamp simulation part; 41. Clamp body; 42. Annular adjustment disk; 43. Rotating plate; 5. Detection device; 51. First-order acceleration detection part; 52. Second-order acceleration detection part; 6. Transmission tower pole part; 61. Spoiler shell; 62. Tower wind-breaking rib. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereby.

[0061] Example 1

[0062] Figure 1The resonance suppression design method of the transmission and transformation tower pole of the present embodiment is shown. The method of the present invention first constructs a pole simulation member 1 and a wind-breaking rib simulation member 2 according to a preset scale ratio to form an aeroelastic model with the wind-breaking rib simulation member 2 as the basis for vibration reduction simulation; simulates different arrangements of the wind-breaking rib simulation member 2 on the pole simulation member 1 to obtain the test simulated wind acceleration corresponding to each arrangement, the test simulated wind acceleration is the acceleration of the pole simulation member 1 under the test simulated wind, compares the test simulated wind acceleration corresponding to each arrangement, and determines the arrangement corresponding to the minimum test simulated wind acceleration as the target arrangement of the wind-breaking rib simulation member 2 on the pole simulation member 1; according to the target arrangement and the preset scale ratio, the arrangement height and arrangement length of the actual tower pole wind-breaking rib 62 are converted to achieve the optimal arrangement of the tower pole wind-breaking rib 62 on the transmission and transformation tower pole 6, effectively avoiding the problem of large subjectivity and poor vibration reduction effect of the wind-breaking rib arrangement selected through experience, maximizing the resonance suppression effect of the transmission and transformation tower pole 6, and ensuring the safety and reliability of the transmission and transformation tower pole 6.

[0063] Each arrangement mode of the present invention corresponds to a combination of different values ​​of at least two influencing factors of the wind-breaking rib simulation member 2, and the influencing factors include the arrangement height of the wind-breaking rib simulation member 2 and the arrangement length of the wind-breaking rib simulation member 2. The influencing factors of the wind-breaking rib simulation member 2 are determined during simulation, and a variety of arrangement modes of the wind-breaking rib simulation member 2 on the rod simulation member 1 can be obtained through the combination of different values ​​of the influencing factors of the wind-breaking rib simulation member 2, thereby providing test data for subsequent simulations, so as to facilitate the acquisition of the final arrangement height and arrangement length of the tower pole wind-breaking rib 62.

[0064] Further, the influencing factor also includes a designated influencing factor. When the wind-breaking rib simulation member 2 is a rectangular wind-breaking rib, the designated influencing factor is the number of wind-breaking rib simulation members 2 arranged, so as to facilitate obtaining the final arranged height of the tower wind-breaking rib 62, the number of tower wind-breaking ribs 62 arranged, and the arranged length of the tower wind-breaking rib 62. When the wind-breaking rib simulation member 2 is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member 2, so as to facilitate obtaining the final arranged height of the tower wind-breaking rib 62, the pitch of the tower wind-breaking rib 62, and the arranged length of the tower wind-breaking rib 62.

[0065] The present invention adopts the test simulated wind acceleration as the simulation result value. The test simulated wind acceleration can accurately measure the high-frequency vibration of the rod simulation part 1, and effectively monitor the loose connection and wear of the rod simulation part 1 during the test simulation process; at the same time, the impact force vibration borne by the constantly changing rod simulation part 1 can be intuitively reflected by measuring the acceleration response, and the degree of damage to the structure can be evaluated. At the same time, the test simulated wind acceleration further verifies that the unreasonable arrangement of the rod breaking wind ribs can significantly amplify the structural response, and the unreasonable rectangular breaking wind rib acceleration response value often presents a multiple surge. If it occurs, it will constitute a serious threat and damage to the performance of the transmission tower rod 6. It verifies that at least two influencing factors of the breaking wind rib simulation part 2 (the arrangement height of the breaking wind rib simulation part 2, the arrangement number of the breaking wind rib simulation part 2, and the arrangement length of the breaking wind rib simulation part 2) are key parameters that affect the control effect, and the value of the influencing factor is crucial to the safe and reliable operation of the transmission tower rod 6.

[0066] At the same time, the present invention compares the test simulated wind acceleration in the simulation result value corresponding to each arrangement mode. The smaller the test simulated wind acceleration, the better the corresponding arrangement mode. The arrangement mode corresponding to the minimum test simulated wind acceleration is determined as the target arrangement mode of the wind-breaking rib simulation member 2 on the rod simulation member 1. While the present invention can accurately measure the high-frequency vibration of the rod simulation member 1, it can accurately determine the optimal arrangement mode of the wind-breaking rib simulation member 2 on the rod simulation member 1 through the minimum test simulated wind acceleration, thereby converting and obtaining the optimal arrangement mode of the tower pole wind-breaking rib 62, and finally achieving the purpose of efficient vibration suppression of the transmission tower pole 6.

[0067] Since the optimal arrangement of the tower wind-breaking ribs 62 on the transmission and transformation tower poles 6 is obtained, the tower wind-breaking ribs 62 can be mass-produced and assembled with the transmission and transformation tower poles 6, which avoids the problems of delayed production and processing and high costs when subjectively selecting wind-breaking ribs.

[0068] It can be seen that the arrangement of the tower wind-breaking ribs 62 obtained by the present invention on the transmission tower pole 6 can maximally destroy the Karman vortex on the surface of the transmission tower pole 6 under light wind and extreme vibration conditions, achieve optimal resonance suppression for the transmission tower poles 6 with different slenderness ratios, ensure the durability and safety of the transmission tower pole 6 and the transmission tower as a whole, and ensure the stable operation of the transmission and transformation line. It also has high installation efficiency, simple structure, and good aesthetics.

[0069] See also Figure 1 The specific steps of the resonance suppression design method of the power transmission tower pole of the present invention are as follows:

[0070] Step 1), a rod simulation part 1 simulating a transmission tower rod 6 and a wind-breaking rib simulation part 2 simulating a tower wind-breaking rib 62 on the transmission tower rod 6 are constructed according to a preset scale ratio, and the wind-breaking rib simulation part 2 is arranged on the outer surface of the rod simulation part 1. In this embodiment, the preset scale ratio sets the maximum length of the rod simulation part 1 according to the cross-sectional size of the test wind tunnel, and then is determined according to the maximum length of the rod simulation part 1 and the actual size of the transmission tower rod 6.

[0071] In this embodiment, the rod simulation member 1 is a tubular rod member, and the rod simulation member 1 simulating the transmission tower rod member 6 and the wind-breaking rib simulation member 2 simulating the tower wind-breaking rib 62 on the transmission tower rod member 6 are constructed, including:

[0072] The configuration parameters of the rod simulation member 1 are determined, and the configuration parameters include the length of the rod simulation member 1, the outer diameter of the rod simulation member 1, the inner diameter of the rod simulation member 1, the natural frequency of the rod simulation member 1, and the test simulation wind speed of the rod simulation member 1. The natural frequency of the rod simulation member 1 is the frequency of the rod simulation member 1 when the vortex-induced vibration occurs at a specific wind speed; the test simulation wind speed of the rod simulation member 1 is the test vibration wind speed applied to the rod simulation member 1 in the simulation scene. Determining the configuration parameters can realize the real simulation of the transmission tower poles 6 with different slenderness ratios, and ensure the accuracy of the test results.

[0073] The length of the rod simulation member 1, the outer diameter of the rod simulation member 1, and the inner diameter of the rod simulation member 1 are determined according to the length of the transmission tower rod 6 to be simulated, the outer diameter of the transmission tower rod 6, the inner diameter of the transmission tower rod 6, and the preset scale ratio. The outer diameter of the rod simulation member 1 can be calculated according to the outer diameter of the transmission tower rod 6 to be simulated and the preset scale ratio according to the following formula (1):

[0074] ,

[0075] in, is the outer diameter of the rod simulation part 1, is the outer diameter of the transmission tower rod 6, The preset scaling ratio. It is determined according to the cross-sectional size of the wind tunnel. For example, if the cross-sectional size of the wind tunnel is three meters, the maximum length of the rod simulation part 1 can be within two meters.

[0076] In this embodiment, the length of the rod simulation member 1 and the inner diameter of the rod simulation member 1 can also be calculated according to formula (1). When calculating the length of the rod simulation member 1, is the length of the bar simulation member 1, is the length of the transmission tower rod 6; when calculating the inner diameter of the rod simulation part 1, is the inner diameter of the rod simulation component 1, is the inner diameter of the transmission and transformation tower pole 6.

[0077] In this embodiment, the test simulation wind speed of the rod simulation member 1 is configured, including:

[0078] Step 11), according to the length of the transmission and transformation tower pole 6, the outer diameter of the transmission and transformation tower pole 6, and the inner diameter of the transmission and transformation tower pole 6, the natural frequency of the transmission and transformation tower pole 6 is calculated; the natural frequency of the transmission and transformation tower pole 6 includes the first-order natural frequency of the transmission and transformation tower pole 6 and the second-order and above natural frequencies of the transmission and transformation tower pole 6.

[0079] Preferably, the first-order natural frequency and the second-order and higher-order natural frequencies of the transmission tower rod 6 can be calculated using different calculation formulas. That is, the first-order natural frequency of the transmission tower rod 6 can be calculated according to the length of the transmission tower rod 6, the outer diameter of the transmission tower rod 6 and the inner-outer diameter ratio of the transmission tower rod 6 according to the following formula (2):

[0080] ,

[0081] in, is the first-order natural frequency of the transmission tower member 6, is the outer diameter of the transmission tower rod 6, is the length of the transmission tower pole 6, E is the elastic modulus of the transmission tower pole 6, is the density of the transmission tower pole 6, The ratio of the inner diameter of the transmission tower rod 6 to the outer diameter of the transmission tower rod 6. The elastic modulus of the transmission tower rod 6 E， Density of transmission tower pole 6 Determined by material properties.

[0082] In extreme weather, high-order vortex vibration (second-order or higher vortex vibration) of the transmission tower pole 6 is easily aroused. The present invention configures the high-order natural frequency of the transmission tower pole 6, thereby providing a simulation basis for the aeroelastic modulus type wind tunnel test of the transmission tower pole 6 during high-order vortex vibration. Preferably, the second-order or higher natural frequency of the transmission tower pole 6 can be calculated according to the length of the transmission tower pole 6 according to the following formula (3):

[0083] ,

[0084] in, is the second-order or higher natural frequency of the transmission tower rod 6, A is the cross-sectional area of ​​the transmission tower rod 6, n is the order of vibration of the transmission tower rod 6, n≥2, is the section inertia moment of the transmission tower rod 6 in the vibration direction. The section inertia moment of the transmission tower rod 6 in the vibration direction is determined according to the characteristics of the transmission tower rod 6 itself.

[0085] The present invention adopts the above-mentioned preferred formula to obtain the first-order natural frequency of the transmission and transformation tower pole 6 and the second-order and above natural frequencies of the transmission and transformation tower pole 6 respectively, and the error between the formula and the actually measured pole frequency does not exceed 5%. The first-order natural frequency and the second-order and above natural frequencies of the transmission and transformation tower pole 6 can be obtained with high precision, thereby ensuring the true and effective simulation of the transmission and transformation tower pole 6, and providing a calculation basis for the subsequent accurate acquisition of the vortex-induced vibration wind speed of different vibration orders of the transmission and transformation tower pole 6 and ultimately determining the experimental simulation wind speed of the pole simulation component 1.

[0086] In other embodiments, the first-order natural frequency of the transmission and transformation tower pole 6 and the second-order and higher natural frequencies of the transmission and transformation tower pole 6 may also be determined according to other calculation formulas or methods as required.

[0087] Step 12), according to the first-order natural frequency and the second-order and above natural frequencies of the transmission and transformation tower rod 6, determine the vortex vibration initiation wind speed of the transmission and transformation tower rod 6 when vibrating at different orders, select the target vortex vibration initiation wind speed that is less than the preset safety wind speed from the vortex vibration initiation wind speed of the transmission and transformation tower rod 6 at each order of vibration, and use the selected target vortex vibration initiation wind speed as the simulated vibration initiation wind speed of the transmission and transformation tower rod 6. The preset safety wind speed is the basic wind speed of the transmission and transformation tower rod 6 installation area, which can be determined by referring to the basic wind speed table of various places and combining with field observations. The preset safety wind speed is generally not more than 20m / s.

[0088] For example, if the preset safety wind speed is 15m / s, and the vortex vibration initiation wind speed of the transmission tower pole 6 during the second-order vibration is 20m / s (greater than 15m / s), the vortex vibration initiation wind speed of the transmission tower pole 6 during the second-order vibration and above is not used as the simulated vibration initiation wind speed of the transmission tower pole 6. If the vortex vibration initiation wind speed of the transmission tower pole 6 during the second-order vibration is 12m / s (less than 15m / s), the vortex vibration initiation wind speed of the transmission tower pole 6 during the second-order vibration is used as the simulated vibration initiation wind speed of the transmission tower pole 6, and then, according to the above method, continue to consider whether the vortex vibration initiation wind speed of the transmission tower pole 6 during the second-order vibration and above is used as the simulated vibration initiation wind speed of the transmission tower pole 6.

[0089] Preferably, the following preferred formula (4) can be used to calculate the vortex vibration initiation wind speed of the transmission tower pole 6 when it vibrates at different orders:

[0090] ,

[0091] in, is the vortex-induced vibration wind speed of the transmission tower pole 6, is the outer diameter of the transmission tower rod 6, is the Stothal number, It represents the natural frequency of any order of the transmission and transformation tower pole 6.

[0092] Among them, the natural frequency of any order of the transmission tower rod 6 is Including the first order natural frequency of the transmission tower pole 6 and the second-order natural frequency of the transmission tower pole 6 . According to the Stohal number, which is a dimensionless constant used to describe the relationship between the vortex frequency of the fluid shedding on the surface of an object and the incoming flow velocity and characteristic length, the Stohal number can be taken according to the European standard, and the Stohal number is 0.18. In other embodiments, the Stohal number can also be taken according to the national standard, and the Stohal number is 0.2.

[0093] The first-order natural frequency of the transmission and transformation tower pole 6 and the second-order and higher natural frequencies of the transmission and transformation tower pole 6 can be determined by using the above preferred formula (4) to determine the vortex-vibration initiation wind speed of the transmission and transformation tower pole 6 when the transmission and transformation tower pole 6 vibrates at different orders, including the vortex-vibration initiation wind speed during the first-order vibration and the second-order and higher vibrations; the target vortex-vibration initiation wind speed that is less than the preset safety wind speed is screened out from the vortex-vibration initiation wind speed of the transmission and transformation tower pole 6 during the vibration of each order, and the screened target vortex-vibration initiation wind speed is used as the simulated initiation wind speed of the transmission and transformation tower pole 6.

[0094] In other embodiments, the vortex-induced vibration wind speed of the transmission and transformation tower pole 6 when vibrating at different orders can also be determined according to other calculation formulas or methods as required.

[0095] Step 13), according to the simulated vibration wind speed of the transmission tower pole 6 and the preset wind speed ratio, determine the test simulated wind speed of the pole simulation member 1. The test simulated wind speed of the pole simulation member 1 can be obtained according to the following formula:

[0096] ,

[0097] in, is the simulated vibration wind speed of the transmission tower pole 6; is the test simulated wind speed of the rod simulation member 1; The preset wind speed ratio can be preset according to the test conditions of the wind tunnel structure. The preset wind speed ratio is generally set to 0.85~1.5 when there is light wind vibration.

[0098] The present invention obtains the vortex-induced vibration wind speeds of the transmission and transformation tower rod 6 during the first-order vibration and the second-order and above vibration respectively according to the first-order natural frequency of the transmission and transformation tower rod 6 and the second-order and above natural frequencies of the transmission and transformation tower rod 6; selects the target vortex-induced vibration wind speed that is less than the preset safety wind speed from the vortex-induced vibration wind speeds of the transmission and transformation tower rod 6 during vibrations of each order, and uses the selected target vortex-induced vibration wind speed as the simulated vibration wind speed of the transmission and transformation tower rod 6; obtains the test simulated wind speed of the rod simulation member 1 according to the simulated vibration wind speed of the transmission and transformation tower rod 6 and the preset wind speed ratio to determine the wind speed range of the simulation scene, so that the test simulated wind speed of the rod simulation member 1 is finally determined based on a comprehensive consideration of the vortex-induced vibration wind speeds of the transmission and transformation tower rods 6 of different orders and the actual pressure-bearing conditions (preset safety wind speed) of the transmission and transformation tower rod 6.

[0099] At the same time, the test simulation wind speed of the pole simulation member 1 can be used as a criterion for judging whether to perform simulation. When the blowing wind speed exceeds the test simulation wind speed of the pole simulation member 1, it is assumed that this situation will not actually occur in the transmission tower pole 6, and no simulation is required. This allows the test simulation to be selected according to the actual needs of the transmission tower pole 6, avoiding the problems of low simulation efficiency and poor simulation effect due to the actual situation of the transmission tower pole 6. It improves the simulation efficiency and accuracy, and greatly reduces the number of simulations.

[0100] In this embodiment, the natural frequency of the rod simulation component 1 is calculated based on the length of the rod simulation component 1, the outer diameter of the rod simulation component 1, and the inner diameter of the rod simulation component 1. The natural frequency of the rod simulation component 1 includes the first-order natural frequency of the rod simulation component 1 and the second-order and above natural frequencies of the rod simulation component.

[0101] Preferably, the first-order natural frequency of the rod simulation member 1 can also be calculated using the formula of formula (2), and the second-order and higher natural frequencies of the rod simulation member 1 can also be calculated using the formula of formula (3). In this case, is the first-order natural frequency of the rod simulation component 1; is the outer diameter of the rod simulation part 1 ; L is the length of the bar simulation member 1; E is the elastic modulus of the rod simulation member 1; is the density of the bar simulation member 1, is the ratio of the inner diameter of the rod simulation part 1 to the outer diameter of the rod simulation part 1. is the second-order or higher natural frequency of the rod simulation component 1, n is the vibration order of the rod simulation member 1, E is the elastic modulus of the rod simulation member 1, is the section inertia moment of the rod simulation component 1 in the vibration direction, is the density of the bar simulation member 1,L is the length of the rod simulation member 1.

[0102] The present invention also adopts the above formulas (2) and (3) to obtain the first-order natural frequency of the rod simulation member 1 and the second-order and above natural frequencies of the rod simulation member 1 respectively, thereby obtaining the natural frequencies of the rod simulation member 1 at different vibration orders with high precision, providing a reliable adjustment reference for the adjustment of the configuration components in the subsequent simulation scene, thereby ensuring the true and effective simulation of the transmission tower rod 6.

[0103] Afterwards, the rod simulation member 1 is configured according to the determined length, outer diameter and inner diameter of the rod simulation member 1. The connection form at both ends of the rod simulation member 1, the arrangement height of the rod simulation member 1 and the size of the supporting column simulation member 3 are set according to the determined natural frequency of the rod simulation member 1, so as to ensure that the test device meets the natural frequency of the rod simulation member 1, and the test device is always in a stable state under the test simulated wind speed of the rod simulation member 1, so as to ensure the real safety simulation of the transmission tower rod 6 at different natural frequencies. Specifically:

[0104] The present invention can adjust the natural frequency of the rod simulation member 1 by the connection form at both ends of the rod simulation member 1, that is, select end connection structures of different strengths of the rod simulation member 1. When the required natural frequency of the rod simulation member 1 is low, a low-strength end connection structure is selected; when the natural frequency of the rod simulation member 1 increases, a high-strength end connection structure is selected.

[0105] Preferably, if Figure 7 As shown, end connection structures are provided at both ends of the rod simulation member 1, and the end connection structures are connected to the support column simulation member 3 by adjusting the clamp simulation member 4. Figure 7 As shown in (a), when the natural frequency of the rod simulation member 1 is low, the end connection structure is set as a single connection plate 11; Figure 7 As shown in (b), when the natural frequency of the rod simulation member 1 increases, end reinforcement ribs are added on both sides of the single connection plate 11 to form a U-shaped connection plate 12. The U-shaped connection plate 12 can improve the strength of the rod simulation member 1 and meet the requirement of increasing the natural frequency of the rod simulation member 1; Figure 7 As shown in (c), when the natural frequency of the rod simulation member 1 is further increased, middle reinforcement ribs are set in the middle of both end faces of the single connection plate 11 to form a cross-shaped connection plate 13. The cross-shaped connection plate 13 can further improve the strength of the rod simulation member 1 on the basis of the U-shaped connection plate 12, and meet the requirement of further increasing the natural frequency of the rod simulation member 1. The setting of the end connection structure ensures that the test device can adapt to the reliable and real simulation of the multi-order natural frequencies of the transmission tower rod 6. The specific selection of the end connection structure can be adjusted according to the actual situation of the transmission tower and the natural frequency of the rod simulation member 1.

[0106] The present invention can also adjust the natural frequency of the rod simulation member 1 by arranging the height of the rod simulation member 1. When the natural frequency of the required rod simulation member 1 is low, the rod simulation member 1 is arranged close to the two ends of the support column simulation member 3; when the natural frequency of the rod simulation member 1 is increased, the rod simulation member 1 is arranged close to the middle of the support column simulation member 3. The specific position of the rod simulation member 1 on the support column simulation member 3 can be adjusted according to actual conditions.

[0107] Preferably, a height adjustment component is provided at the top and / or bottom of the support column simulation member 3. In this embodiment, the height adjustment component includes a column clamp and a fixing plate, the fixing plate is fixed to the ground or top surface of the wind tunnel test, the column clamp is installed on the fixing plate, and one end of the support column simulation member 3 can be relatively movably arranged on the column clamp and can move within the length range of the column clamp. When the rod simulation member 1 moves to the desired height, the support column simulation member 3 is fixedly connected to the column clamp by a fastener, thereby facilitating the height adjustment of the rod simulation member 1.

[0108] The present invention can also adjust the natural frequency of the rod simulation member 1 by the length and diameter of the support column simulation member 3. When the natural frequency of the rod simulation member 1 is low, the support column simulation member 3 can be selected as a support column simulation member 3 with a long length and / or a small diameter; when the natural frequency of the rod simulation member 1 is increased, the support column simulation member 3 can be selected as a support column simulation member 3 with a short length and / or a large diameter. The specific size of the support column simulation member 3 can be adjusted according to actual conditions.

[0109] The specific method of adjusting the natural frequency of the rod simulation member 1 can be selected according to the actual situation. For example, only the connection form at both ends of the rod simulation member 1 or the arrangement height of the rod simulation member 1 can be adjusted, or they can be adjusted in combination, which is not limited here.

[0110] Preferably, the test device can construct a finite element model according to the configuration parameters of the simulation scene, and perform modeling calculations to obtain accurate influencing factors that need to be adjusted to ensure the true simulation of the test. For example, if an elastic modulus wind tunnel test is performed on a transmission tower pole 6 with a length of 7103 mm, a slenderness ratio of 165, and a wall thickness of 4 mm, the constraint stiffness at both ends of the transmission tower pole 6 corresponds to the weak axis connected by the single connection plate 11. After finite element calculation simulation error does not exceed 1% (the difference is less than 1% obtained by comparing the theoretical calculation formula and the actual articulated simulation of the finite element), it can be seen that the end connection structure using the single connection plate 11 can truly and effectively simulate the articulation of the two ends of the transmission tower pole 6.

[0111] The present invention can construct a simulation scenario that realizes a real simulation of the transmission and transformation tower pole 6 under different conditions (such as different fixed frequencies) by adjusting the size of the pole simulation part 1, the size of the supporting column simulation part 3, the arrangement height of the pole simulation part 1, and the support direction, thereby providing a reliable guarantee for subsequently obtaining the optimal arrangement form of the tower pole wind-breaking ribs 62.

[0112] Preferably, in step 1), a rod simulation part 1 simulating a transmission tower rod 6 and a wind-breaking rib simulation part 2 simulating a tower rod wind-breaking rib 62 on the transmission tower rod 6 are constructed, and a support column simulation part 3 and an adjustment clamp simulation part 4 are also constructed. Figure 2 and Figure 3 As shown, the support column simulation member 3 is two support column simulation members 3 arranged opposite to each other perpendicular to the wind direction of the test simulated wind, so that the rod simulation member 1 is perpendicular to the wind direction of the test simulated wind; the two ends of the rod simulation member 1 are respectively installed horizontally or obliquely on the support column simulation member 3 through an adjustable clamp simulation member 4. In practice, the transmission tower pole member 6 is placed in an inclined form. In order to meet the simulation requirements of the inclined transmission tower pole member 6 and explore the optimal angle of the inclined transmission tower pole member 6 in actual setting, the pole simulation member 1 can also be installed obliquely on the support column simulation member 3 by adjusting the clamp simulation member 4.

[0113] Preferably, in order to facilitate the tilting arrangement and angle adjustment of the rod simulation member 1, as Figure 5 and Figure 6 As shown, the adjusting clamp simulation part 4 includes a clamp body 41, an annular adjusting disk 42 and a rotating plate 43. Among them, the annular adjusting disk 42 is connected to the clamp body 41; the rotating plate 43 is connected to the rod simulation part 1, and the rotating plate 43 is provided with an adjusting arc surface adapted to the annular outer surface of the annular adjusting disk 42. The rotating plate 43 can rotate relative to the circumferential direction of the annular adjusting disk 42 when the rod simulation part 1 adjusts the angle, and is limited and fixed when the rod simulation part 1 is adjusted to a preset angle. Its adjusting clamp simulation part 4 has a simple structure and is easy to adjust, thereby realizing the real simulation of the horizontal and inclined states of the transmission and transformation tower rod 6.

[0114] Step 2), simulate different arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1 to obtain simulation result values ​​corresponding to each arrangement, the simulation result values ​​including test simulated wind acceleration, each arrangement corresponds to a combination of different values ​​of at least two influencing factors of the wind-breaking rib simulation member 2, the influencing factors include the arrangement height and arrangement length of the wind-breaking rib simulation member 2, and the test simulated wind acceleration is the acceleration of the rod simulation member 1 under the test simulated wind.

[0115] In this embodiment, Figure 4As shown, the influencing factor also includes a specified influencing factor. The wind-breaking rib simulation member 2 is a rectangular wind-breaking rib, and the specified influencing factor is the number of wind-breaking rib simulation members 2 arranged. The simulation of different arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1 includes determining multiple arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1, which includes the following steps:

[0116] Step A21), configure at least two first values ​​for the arrangement height of the wind-breaking rib simulation member 2, configure at least two second values ​​for the number of wind-breaking rib simulation members 2, and configure at least two third values ​​for the arrangement length of the wind-breaking rib simulation member 2, wherein the first value is proportional to the outer diameter of the rod simulation member 1, and the third value is proportional to the length of the rod simulation member 1. The specific configuration value of each influencing factor can be adjusted according to the actual simulation requirements of the transmission tower rod 6. In other embodiments, when the wind-breaking rib simulation member 2 is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member 2, and at this time, at least two second values ​​are configured for the pitch of the wind-breaking rib simulation member 2.

[0117] The value of the influencing factor can be determined according to the actual situation of the transmission tower pole 6. For example, the height of the wind-breaking rib simulation part 2 can be considered in addition to the ratio of the outer diameter of the pole simulation part 1, and the aesthetics and economy can be considered. Usually, the height of the wind-breaking rib simulation part 2 is / 10 or less. The number of wind-breaking rib simulation members 2 can be considered from the perspective of aerodynamics and structural stress stability. Too many wind-breaking rib simulation members 2 may change the cross-sectional shape and size of the rod simulation member 1, causing the stress distribution and deformation mode of the rod simulation member 1 to change when subjected to stress, thereby reducing the bearing capacity and service life of the rod simulation member 1. The standard is to ensure that the transmission tower rod 6 is stable and safe under various working conditions, avoid excessive windshield area leading to increased wind load impact, increased cross-sectional turbulence, etc., and the number of wind-breaking rib simulation members 2 can also be set to 5, 7, etc.

[0118] In step A22, a first value, a second value and a third value are selected from at least two first values, second values ​​and third values ​​respectively to obtain multiple groups of selection combinations, and at least one of the first value, the second value and the third value of different groups of selection combinations is different.

[0119] Step A23), orthogonal tests are performed on multiple selection combinations to obtain optimized selection combinations, which are used as multiple arrangements of the wind-breaking rib simulation parts on the rod simulation parts.

[0120] In a specific embodiment, as shown in Table 1, the arrangement height of the wind-breaking rib simulation member 2 is configured with three first values, which are respectively / 20, / 10 and 3 / 20, is the outer diameter of the rod simulation member 1; the number of the wind-breaking rib simulation members 2 is configured with three second values, which are 4, 6 and 8 respectively; the length of the wind-breaking rib simulation members 2 is configured with three third values, which are 1 / 3 L , 2 / 3 L and L , L is the length of the rod simulation member 1.

[0121] ,

[0122] Afterwards, a first value, a second value, and a third value are selected from the three first values, the three second values, and the three third values, respectively, to obtain 27 groups of selection combinations. Afterwards, the 27 groups of selection combinations are determined as multiple arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1, and the 27 groups of arrangements are simulated in the constructed simulation scene.

[0123] Preferably, an orthogonal test can also be performed on the 27 selected combinations. As shown in Table 2, the orthogonal test method ( ) The 27 selection combinations can be simplified into 9 selection combinations. The orthogonal test can select the optimal selection combination of the wind-breaking rib simulation component 2, thereby greatly simplifying the test process and greatly improving the test efficiency while ensuring the accuracy of the test simulation results. Afterwards, the 9 optimized selection combinations are determined as 9 sets of arrangement methods of the wind-breaking rib simulation component 2 on the rod simulation component 1, and the 9 sets of arrangement methods are simulated in the constructed simulation scene.

[0124] ,

[0125] The orthogonal test of the present invention uses an orthogonal table and a minimum number of experiments to examine the effects of multiple influencing factors on the experimental results, and quickly find the optimal combination. The present invention conducts an orthogonal test on multiple selection combinations consisting of the influencing factors of the wind-breaking rib simulation part 2. The orthogonal test design can systematically consider the influencing factors of the wind-breaking rib simulation part 2 and their interactions, ensuring the comprehensiveness and reliability of the test results. Through the orthogonal test, the test points will be evenly distributed within the test range, and each test point is representative, which can fully reflect the effects of the influencing factors of each wind-breaking rib simulation part 2 on the test results, and obtain an optimized and representative selection combination. The maximum amount of information can be obtained with the minimum number of experiments, improving the test efficiency; through reasonable sample selection and influencing factor combination, a lot of time and cost can be saved; the results of the orthogonal test are reliable and repeatable.

[0126] More preferably, the determination of the multiple arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1 may include: determining the theoretical optimal arrangement of the wind-breaking rib simulation member 2 on the rod simulation member 1 according to the influencing factor, and determining the multiple arrangements of the wind-breaking rib simulation member 2 on the rod simulation member 1 in the theoretical optimal arrangement, which includes the following steps:

[0127] Step B21), according to different values ​​of the influencing factors, three arrangement sets are established, each arrangement set includes multiple horizontal groups, and each horizontal group includes multiple arrangement methods. In this embodiment, the wind-breaking rib simulation member 2 is a rectangular wind-breaking rib, and each arrangement group includes the arrangement height of the wind-breaking rib simulation member 2, the arrangement number of the wind-breaking rib simulation member 2, and the arrangement length of the wind-breaking rib simulation member 2. In other embodiments, when the wind-breaking rib simulation member 2 is a spiral wind-breaking rib, the arrangement number of the wind-breaking rib simulation member 2 is replaced by the pitch of the wind-breaking rib simulation member 2.

[0128] Among them, the three arrangement mode sets respectively use the arrangement height of the wind-breaking rib simulation member 2, the arrangement length of the wind-breaking rib simulation member 2, and one of the designated influencing factors determined according to the shape of the wind-breaking rib simulation member 2 as fixed influencing factors with unchanged values ​​in the multi-factor variance analysis. In this embodiment, the wind-breaking rib simulation member 2 is a rectangular wind-breaking rib, and the designated influencing factor is the arrangement number of the wind-breaking rib simulation member 2. At this time, the first arrangement mode set uses the arrangement height of the wind-breaking rib simulation member 2 as a fixed influencing factor, the second arrangement mode set uses the arrangement number of the wind-breaking rib simulation member 2 as a fixed influencing factor, and the third arrangement mode set uses the arrangement length of the wind-breaking rib simulation member 2 as a fixed influencing factor, thereby forming three arrangement mode sets. In other embodiments, when the wind-breaking rib simulation member 2 is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member 2. At this time, the second arrangement mode set uses the pitch of the wind-breaking rib simulation member 2 as a fixed influencing factor.

[0129] The number of horizontal groups is the number of fixed influence factor values. For example, if the number of fixed influence factor values ​​is 3, then the number of horizontal groups in the layout set is 3.

[0130] Each arrangement mode in the same horizontal group has different values ​​of influencing factors except the fixed influencing factors. For example, in the first arrangement mode set, the arrangement height of the wind-breaking rib simulation member 2 of each arrangement mode in the same horizontal group is the same, and the arrangement quantity of the wind-breaking rib simulation member 2 and the arrangement length of the wind-breaking rib simulation member 2 are different; in the second arrangement mode set, the arrangement quantity of the wind-breaking rib simulation member 2 of each arrangement mode in the same horizontal group is the same, and the arrangement height of the wind-breaking rib simulation member 2 and the arrangement length of the wind-breaking rib simulation member 2 are different; in the third arrangement mode set, the arrangement length of the wind-breaking rib simulation member 2 of each arrangement mode in the same horizontal group is the same, and the arrangement height of the wind-breaking rib simulation member 2 and the arrangement quantity of the wind-breaking rib simulation member 2 are different.

[0131] For example, the nine groups of arrangement modes obtained by orthogonal test in Table 2 are grouped to obtain three arrangement mode sets. Table 3 shows the first arrangement mode set, in which the arrangement heights of the wind-breaking rib simulation members 2 of each horizontal group are different (respectively / 20, / 10 and 3 / 20), the arrangement heights of the wind-breaking rib simulation members 2 in the same horizontal group are the same, and the arrangement numbers and arrangement lengths of the wind-breaking rib simulation members 2 are different. In other embodiments, selection combinations without orthogonal experiments can also be used, such as the 27 selection combinations obtained in Table 1 as the influencing factors of the three arrangement mode sets. In this case, the horizontal group of each arrangement mode set is the number of fixed influencing factor values, that is, 9 horizontal groups.

[0132] ,

[0133] The present invention divides the three influencing factors into three arrangement sets for separate analysis, sets a horizontal group with different values ​​of the fixed influencing factors in each arrangement set, sets other two fixed influencing factors with different values ​​in the horizontal group, and clarifies the three influencing factors of the wind-breaking rib simulation part 2 as control variables, which provides a basis for using multi-factor variance analysis to perform different combination analyses of the three influencing factors, thereby analyzing the vibration reduction effect of the influencing factors on the tower wind-breaking rib 62 and the joint effects of the influencing factors on the vibration reduction effect of the tower wind-breaking rib 62 according to the actual application of the wind-breaking rib simulation part 2, thereby efficiently and accurately determining the degree of influence of each influencing factor on the vibration reduction effect of the tower wind-breaking rib 62.

[0134] Step B22), multi-factor variance analysis is used to perform inter-group variation and intra-group variation of the horizontal groups in each arrangement set, as well as interactive variation analysis between arrangement sets, and the target influencing factors that have a significant impact on the test simulated wind acceleration are determined based on the analysis. The present invention can intuitively reflect the vibration reduction effect of the wind-breaking rib simulation member 2 through the test simulated wind acceleration.

[0135] Among them, the between-group variation reflects the difference in means between different level groups in the same layout set, that is, the influence of different level groups under a single fixed influence factor in the layout set on the experimental simulated wind acceleration; the within-group variation reflects the difference between the other two influencing factors in the same level group, that is, the influence of the other two influencing factors in the level group except the fixed influence factor on the experimental simulated wind acceleration; the interactive variation reflects the difference in means between the fixed influence factors in different layout sets, that is, the influence of a single fixed influence factor in the three layout sets and the interaction of fixed influence factors on the experimental simulated wind acceleration.

[0136] In this embodiment, the inter-group and intra-group variance analysis of the level groups in each arrangement set uses the F test (including the intra-group mean square sum (MSA, MSB, MSC) and the inter-group mean square sum (MSEA, MSEB, MSEC) in the multi-factor analysis of variance. , , ) to determine the target influencing factors that have a significant impact on the experimental simulated wind acceleration. The interactive variance analysis between the layout sets uses the interactive sum of squares ( ), interactive degrees of freedom ( ) of the F test (including , and ) Determine the target influencing factors that have a significant impact on the test simulation wind acceleration. The specific steps include:

[0137] Step B221), obtain the F statistics of the inter-group variation and intra-group variation of the level groups in each arrangement set, and the F statistics of the interaction variation between the arrangement sets.

[0138] The existing single-factor variance analysis table includes the following key parts: SST (total deviation sum of squares), SSA (within-group sum of squares), SSE (between-group sum of squares), MSE (between-group mean sum of squares), MSA (within-group mean sum of squares). The present invention considers three interacting influencing factors, introduces the within-group sum of squares corresponding to the three arrangement sets (respectively expressed as SSA, SSB, SSC), the between-group sum of squares (respectively expressed as SSEA, SSEB, SSEC) and the interactive influence factor sum of squares of the three arrangement sets (respectively expressed as SSAB, SSAC, SSBC).

[0139] The F statistic is obtained based on the within-group sum of squares, between-group sum of squares, and interaction factor sum of squares. The F statistic includes the sum of squares of each fixed factor in the three arrangement sets. , and (the ratio of the between-group mean square sum to the within-group mean square sum), and the interaction effects of the three placement methods , and (ratio of the interaction sum of squares to the degrees of freedom for the interaction).

[0140] Where, optionally, calculation The calculation formula is:

[0141] ,

[0142] Where, optionally, calculation The calculation formula is:

[0143] ,

[0144] Where a is the number of arrangements in a single arrangement set, k is the amount of data in each level group in a single arrangement set, k-1 is the degree of freedom within the group, is the degree of freedom between groups. F() is the distribution function, which represents the distribution form after the random variable is divided by the degree of freedom within the group and the degree of freedom between the groups. is the mean square and MSE between groups. It is the F test of the first arrangement mode set, wherein A represents the arrangement mode set whose fixed influencing factor is the arrangement height of the wind-breaking rib simulation member 2. is the F test of the interaction between the first arrangement set and the second arrangement set, where AB represents the interaction sum of squares between the first arrangement set and the second arrangement set.

[0145] In a specific embodiment, as shown in Table 3, the number of arrangement modes a in a single arrangement mode set is 9, and the amount of data k of the horizontal group in a single arrangement mode set is 3. Substituting a and k into the above formula for calculation, we can get In other embodiments, the number of settings of a and k can be adjusted according to actual experimental requirements.

[0146] is the F test for the second set of arrangements, It is the F test of the third arrangement mode set, wherein B represents the arrangement mode set whose fixed influencing factor is the arrangement number of the wind-breaking rib simulation parts, and C represents the arrangement mode set whose fixed influencing factor is the arrangement length of the wind-breaking rib simulation parts. and The above formula is also used to obtain. At this time, replace SSA with the corresponding SSB and SSC; Replace with corresponding SSEB and SSEC; Replace with the corresponding , ; Replace with the corresponding and .

[0147] This is the F test for the interaction between the second and third arrangement sets. is the F test of the interaction between the first arrangement set and the third arrangement set, wherein BC represents the interaction sum of squares between the second arrangement set and the third arrangement set, and AC represents the interaction sum of squares between the first arrangement set and the third arrangement set. and The above formula is also used to obtain. At this time, Replaced with corresponding SSAC and SSBC; Replace with the corresponding , , that is, replace it with the formula: , . Replace with corresponding SSEB, SSEC; Replace with the corresponding , .

[0148] In this embodiment, SSA (SSB and SSC) and MSA ( , ) The influence of the other two influencing factors in the horizontal group considered, except the fixed influencing factor, on the experimental simulated wind acceleration. (SSEA, SSEB and SSEC) and MSE (MSEA, MSEB and MSEC) consider the influence of fixed influencing factors of different values ​​between different level groups on the test simulated wind acceleration. SSE considers the changing trend of vibration reduction between different level groups on the basis of SSA. SSAB, SSAC and SSBC consider the influence of the interaction of fixed influencing factors in the three arrangement sets on the test simulated wind acceleration.

[0149] Preferably, the statistical software SPSSAU can be used to perform inter-group variation and intra-group variation of the horizontal groups in each arrangement set, as well as interactive variation analysis between arrangement sets, so as to obtain the F statistic quickly and accurately.

[0150] Step B222), the obtained F statistic is subjected to hypothesis tests of inter-group variation and intra-group variation, as well as hypothesis tests of interactive variation, to obtain the target influencing factors that have a significant impact on the experimental simulated wind acceleration. Hypothesis testing is a test under the null hypothesis (H0), with a significance level of ɑ=0.05, and the statistic follows the F distribution.

[0151] In this embodiment, the hypothesis test of inter-group variation and intra-group variation within a single influencing factor includes: judging whether there are statistically significant differences between different level groups in the same arrangement set. The basic principle is to infer whether there are significant differences between corresponding level groups by comparing the variation between different level groups. Specifically:

[0152] The initial significance level is α=0.05 (α is a commonly used value in probability and statistical theory, and 0.05 can meet most engineering requirements). The hypothesis test interval (the acceptance domain when the significance level is equal to 0.05) is 1-α=0.95. Determine whether the F distribution is within the test interval. If the F distribution is within the test interval, it means that there are obvious differences between the level groups in the layout set, and the level group under the fixed influence factor has an important influence on the test results. In this case, the level group under the fixed influence factor meets the hypothesis; if the F distribution exceeds the test interval, it means that the level group under the fixed influence factor has a small influence on the test results and the influence on the experiment can be ignored. In this case, the level group under the fixed influence factor does not meet the hypothesis. Similar calculations can be performed on the level groups under all influencing factors to obtain all data results, and the data results that meet the requirements are recorded.

[0153] The analysis is performed on a set of layout methods with the fixed influencing factor being the layout height of the wind-breaking rib simulation member 2. The analysis is performed according to the maximum value of the acceleration response of the vibration under the horizontal group in the layout method set (the layout method with the maximum value of the test simulated wind acceleration response is taken from the three layout methods of a horizontal group). The SSA (respectively recorded as SSA1, SSA2 and SSA3) and SSEA (respectively recorded as SSEA1, SSEA2 and SSEA3) of the three horizontal groups at the layout height of the wind-breaking rib simulation member 2 are calculated, and the statistical distribution is obtained, i.e., the distribution (i.e., FA1, FA2 and FA3 of the three horizontal groups). If If it falls within the test interval, it means that the level group under the fixed influence factor meets the hypothesis; if it is not within the acceptance area, the level group under the fixed influence factor does not meet the hypothesis.

[0154] For example, in the arrangement mode set with the arrangement height of the wind-breaking rib simulation member 2 as a fixed influencing factor, if If the distribution meets the assumption, it means that the corresponding level group under the influencing factor has an impact on the vibration reduction effect. If FA1 does not meet the assumption, it means that the corresponding level group under the influencing factor has a negligible impact on the vibration reduction effect.

[0155] In this embodiment, the hypothesis test of interactive variation includes: determining whether there are statistically significant differences between different sets of arrangement modes. The basic principle is to infer whether there are significant differences between different sets of arrangement modes by comparing the variation (variance) between different sets of arrangement modes. Specifically:

[0156] The same hypothesis test method as the above inter-group variation and intra-group variation was used. The initial significance level was α=0.05, and the hypothesis test interval was 1-α=0.95. The F distribution (including , and ) is within the test interval. For example, The distribution is within the inspection range, indicating that the two influencing factors, the number of wind-breaking rib simulation pieces 2 and the length of wind-breaking rib simulation pieces 2, interfere with the height of wind-breaking rib simulation pieces 2. The assumption is met; if the F distribution exceeds the test interval, it means that the influencing factor does not interfere with the layout height and can be ignored. At this time, the data results that meet the assumption are recorded to obtain the target influencing factor that has a significant impact on the test simulation wind acceleration.

[0157] Step B23), a linear relationship is obtained according to the influence of the determined target influencing factor on the test simulated wind acceleration, the intra-group sums of squares of different level groups are multiplied by the normalized coefficients of the corresponding target influencing factors, and the level group with the smallest product under each target influencing factor is selected as the preferred level group, and the interaction variance coefficient is used to weight each preferred level group to form a linear relationship; the result value of the linear relationship within the minimum or preset error range is determined as the theoretical optimal arrangement of the wind-breaking rib simulation member 2 on the rod simulation member 1, and as a plurality of arrangement methods of the wind-breaking rib simulation member 2 on the rod simulation member 1.

[0158] Specific:

[0159] For the target impact factor that meets the hypothesis, the variance coefficient is obtained according to the calculation of the F test. Specifically, using statistics, a point with a density function integral area of ​​α (α=0.05) is obtained for the target impact factor that meets the hypothesis according to the F distribution (analogous to the normal distribution), which is recorded as the upper α quantile. F (α) is the upper α quantile, which is the variance coefficient, recorded as k.

[0160] Taking the assumption that all three influencing factors meet the assumption as an example, the three variance coefficients k are ka1, ka2, and ka3 (corresponding to FA1, FA2, and FA3, respectively). To facilitate subsequent analysis, the three variance coefficients are normalized, that is, the three variance coefficients are divided by the largest variance coefficient, and the sign remains unchanged after normalization; the mean of each level group in the same level arrangement set is multiplied by the normalized variance coefficient to obtain the level combination with the smallest variance under each fixed influencing factor.

[0161] For example, for the description of "three horizontal groups in the set of layout modes with the layout length of the wind-breaking rib simulation component 2 as the fixed influencing factor", the sum of squares within the three horizontal groups are SSA1, SSA2 and SSA3 (respectively denoted as a1, a2, and a3), that is, a1, a2, and a3 are multiplied by the normalized coefficient k of the corresponding influencing factor, respectively, denoted as a1×ka1, a2×ka2, and a3×ka3, respectively. The corresponding horizontal group a×ka with the smallest product is selected, that is, the horizontal group with the smallest variance under the fixed influencing factor is the preferred horizontal group. Similarly, the corresponding values ​​of the other two influencing factor groups can be obtained by calculation, that is, b1×kb1, b2×kb2, d3×kd3; c1×kc1, c2×kc2, and c3×kc3. The corresponding horizontal groups b×kb and c×kc with the smallest product are selected, that is, the horizontal group with the smallest variance under the fixed influencing factor is the preferred horizontal group.

[0162] In order to consider the influence of multiple influencing factors, the interaction variance coefficients kab, kac and kbc are introduced. Specifically, taking the arrangement height of the wind-breaking rib simulation part 2 as a set of fixed influencing factors as an example, the F distribution of SSAB and SSAC is used to calculate F (α), and kAB and kAC are obtained. The product of kAB and kAC is recorded as kbc. Similarly, the interaction variance coefficients of the other two influencing factor groups can be obtained by calculating them separately and recorded as kac and kab.

[0163] The optimization results of the three different layouts are recorded as: S=a×ka×kbc+b×kb×kac+c×kc×kab. In this embodiment, the smaller the result value S of the linear relationship, the better the corresponding layout. The result value of the linear relationship within the minimum or error range is determined as the theoretical optimal layout of the wind-breaking rib simulation part 2 on the rod simulation part 1. The present invention is for vibration reduction control of the transmission tower rod 6. The smaller the S value, the better the vibration reduction effect. Of course, there are also preferred layouts with close S values ​​(difference within ±5%). The closer preferred layout is determined as the theoretical optimal layout of the wind-breaking rib simulation part 2 on the rod simulation part 1, and the theoretical optimal layout is determined as a variety of layouts of the wind-breaking rib simulation part 2 on the rod simulation part 1.

[0164] The present invention obtains the level group under the fixed influence factor that meets the hypothesis through the F test, and then obtains the intra-group sum of squares (SSA, SSB, SSC) of the level group that meets the hypothesis, which represents the vibration reduction value of this level group; then optimizes the inter-group influence in the same arrangement set; at the same time, introduces the interference of multiple influence factors to carry out the interactive influence of fixed influence factors in different arrangement sets, and corrects different influence factors (introduces the interaction variance coefficient), and finally uses the linear hypothesis to obtain the linear relationship under the combination of three different level groups, and obtains the theoretical optimal arrangement of one or more windbreak rib simulation parts 2 on the rod simulation part 1 according to the result value of the linear relationship. The obtained theoretical optimal arrangement can be simulated in the constructed simulation scene to more accurately and quickly obtain the arrangement with the best vibration reduction effect, so as to determine the target arrangement of the windbreak rib simulation part 2 on the rod simulation part 1.

[0165] Furthermore, different arrangements of the wind-breaking rib simulation member on the rod simulation member are simulated to obtain the experimental simulated wind acceleration of the simulation result value corresponding to each arrangement, including:

[0166] A detection device 5 is provided, and the detection device 5 includes an acceleration detection member to accurately detect the test simulated wind acceleration. The acceleration detection member includes a first-order acceleration detection member 51 and a second-order acceleration detection member 52. The first-order acceleration detection member 51 is provided at the axial center of the rod simulation member 1 to accurately detect the first-order test simulated wind acceleration at the first-order maximum amplitude position; the second-order acceleration detection member 52 is provided at one-fourth or three-fourths of the axial direction of the rod simulation member 1 to accurately detect the second-order test simulated wind acceleration at the second-order maximum amplitude position. In other embodiments, the mechanical model of the test rod simulation member 1 is similar to the mechanical model of a simply supported beam, and the acceleration detection member is placed at the peak point of the vibration mode of the nth order natural frequency investigated in the test. For example, when a higher-order vibration simulation of the third order or higher occurs to the transmission tower rod 6, the setting position of the acceleration detection member can be determined according to the existing vibration mode diagram of the simply supported beam.

[0167] Preferably, two first-order acceleration detection members 51 are symmetrically arranged on the upper and lower sides of the rod simulation member 1, and the second-order acceleration detection member 52 is symmetrically arranged on the upper and lower sides of the rod simulation member 1. The average value of the detection values ​​of the two first-order acceleration detection members 51 is the final first-order acceleration detection value, and the average value of the detection values ​​of the two second-order acceleration detection members 52 is the final second-order acceleration detection value. This avoids the detection error caused by the deadweight of the rod simulation member 1 and ensures the accuracy of the detection result. In this embodiment, the acceleration detection member can be an acceleration sensor, etc.

[0168] In addition to considering the first-order vibration simulation, the first-order acceleration detection component 51 and the second-order acceleration detection component 52 of the present invention also consider the simulation of high-order vortex vibration under extreme weather conditions to provide data support for high-order vortex vibration phenomena. At the same time, the acceleration detected by the acceleration detection component is used as the simulation result value to ensure the accuracy of the detection result and facilitate the precise determination of the optimal setting position of the wind-breaking rib simulation component. Specifically:

[0169] From the perspective of the test object, breeze vibration itself is a relatively high-frequency vibration, and its aeroelastic modulus high-frequency vibration is more significant, while existing detection methods are difficult to detect high-frequency vibrations of structures. The present invention uses an acceleration detection component to measure acceleration, which can accurately measure the high-frequency vibrations of structures. At the same time, measuring acceleration can effectively monitor the loose connection and wear of the rod simulation component 1 during the test simulation process. For example, when performing a first-order vibration simulation, when the mid-span acceleration of the rod simulation component 1 is greater than the preset evaluation standard, it means that the rod simulation component 1 has loose connection and wear.

[0170] In terms of assessing the degree of damage, most of the transmission tower poles 6 are fatigue damage at the node connection, which is mainly affected by the acceleration of the poles when they vibrate in the breeze. By measuring the acceleration response, the impact force borne by the transmission tower poles 6 can be intuitively and reliably reflected, and the degree of damage to the structure can be assessed. However, the vibration amplitude of this impact force is often variable, and it is difficult to measure using stress sensors and other means. At the same time, when the transmission tower poles 6 are subjected to short-term strong impact loads, they are instantaneous and strong. By measuring the acceleration, data capture and monitoring of such events can be carried out, providing a database for subsequent accident handling and future prevention and control methods.

[0171] Furthermore, the detection device 5 also includes a wind speed detection component, which is arranged on the rod simulation component 1 to detect the simulated wind speed, and can be used to determine whether the simulated wind speed reaches the test simulated wind speed of the rod simulation component 1; at the same time, it is convenient to understand the vibration conditions under different wind speeds in real time and determine the vibration range, such as the simulated wind speed corresponding to the start of vibration, stop of vibration and maximum vibration amplitude. In this embodiment, the wind speed detection component can be an ultrasonic anemometer, etc.

[0172] More preferably, the detection device 5 further includes a displacement detection member, which is arranged on the leeward side of the rod simulation member 1, and the displacement detection member is arranged at the axial center of the rod simulation member 1, and at one quarter or three quarters of the axial length of the rod simulation member 1, to detect the displacement of the rod simulation member 1 during first-order vibration and second-order vibration. The displacement of the rod simulation member 1 can be used as a comparative example to compare with the experimental simulated wind acceleration, which further proves the accuracy of the experimental simulated wind acceleration, and the obtained displacement data can also be used as auxiliary reference data. In this embodiment, the displacement detection member is a laser displacement meter, etc.

[0173] Figure 8(a) is the detection data of the displacement detection component. It can be seen that the displacement response of the rod simulation component 1 is less than 0.5mm when responding to breeze vibration. Its accuracy is low and the error is large. In addition, due to the low amplitude of the breeze vibration displacement of the transmission tower pole 6, the rod simulation component 1 is a scaled transmission tower pole. Its displacement during vibration is smaller than that of the actual transmission tower pole 6. The displacement detection component cannot accurately capture high-frequency vibrations of the transmission tower pole 6. It can be seen that the data obtained by detecting the displacement of the rod simulation component 1 has low accuracy and poor reliability. Figure 8 (b) is the test data of the acceleration detection component. It can be seen that the acceleration response can reach 0.3m / s 2 It has high precision, small error, high data reliability and stability, and can accurately capture the high-frequency vibration of the transmission tower pole 6.

[0174] Step 3) compare the experimental simulated wind accelerations in the simulation result values ​​corresponding to each arrangement mode, and determine the arrangement mode corresponding to the minimum experimental simulated wind acceleration as the target arrangement mode of the wind-breaking rib simulation member 2 on the rod simulation member 1.

[0175] In a specific embodiment, according to step 1), the rod simulation member 1 is fixed on the support column simulation member 3 with an outer diameter of 50mm, a wall thickness of 10mm and a length of 2.5m. The height of the two ends of the rod simulation member 1 from the ground is 0.6m, the length of the rod simulation member 1 (excluding the end connection length) is 2.256m, the outer diameter of the rod simulation member 1 is 40mm, the inner diameter of the rod simulation member 1 is 1.2mm, and the test simulated wind speed of the rod simulation member 1 is 0-25m / s; according to the natural frequencies of the rod simulation member 1 at different orders obtained by calculation, the two ends of the rod simulation member 1 are connected to the support column simulation member 3 by a single connecting plate 11. The acceleration sensor is installed on the upper and lower surfaces of the center and one-quarter of the rod simulation member 1 and is perpendicular to the flow field direction; the laser displacement meter is installed on the leeward side parallel to the flow field at the center and one-quarter of the rod simulation member 1, and markers are attached at the corresponding positions to facilitate laser measurement.

[0176] The 9 sets of arrangement of the wind-breaking rib simulation member 2 in the rod simulation member 1 in Table 2 are simulated in the above constructed simulation scene. Specifically, the wind-breaking rib simulation member 2 is a rectangular wind-breaking rib, and the arrangement height of the rectangular wind-breaking rib is 2 mm ( / 20), 4mm ( / 10) and 6mm (3 / 20, the lengths of the rectangular wind-breaking ribs are 0.752m (1 / 3 L )、1.504m(2 / 3 L ) and 2.256m ( L), the number of rectangular wind-breaking ribs are 4, 6 and 8 respectively, and the rectangular wind-breaking ribs are evenly arranged on the periphery of the rod simulation part 1.

[0177] Afterwards, the experimental simulated wind accelerations of the nine groups of arrangements detected by the acceleration sensor were compared. Judging from the result values ​​of the experimental simulated wind acceleration corresponding to each arrangement, the vibration reduction effect is better when the arrangement length of the rectangular wind-breaking rib is 1.504m and 2.256m, and the breeze vibration suppression effect is best when the arrangement length of the rectangular wind-breaking rib is 2.256m. It also has a certain vibration reduction effect on high-order vortex-induced vibrations in extreme weather. The arrangement corresponding to the smallest experimental simulated wind acceleration is determined as the target arrangement of the wind-breaking rib simulation component 2 on the rod simulation component 1. Specifically:

[0178] The first-order vertical vortex-induced resonance represents the vibration of the rod simulation component 1 under normal breeze, and the second-order vertical vortex-induced resonance represents the vibration of the rod simulation component 1 under extreme weather. The maximum amplitude is the test simulated wind acceleration detected by the acceleration sensor, which is used as the evaluation value of the control effect. The smaller the test simulated wind acceleration, the better the control effect, and the better the corresponding arrangement. As shown in Table 4, the arrangement of the rod simulation component 1 with the wind-breaking rib simulation component 2 having the best control effect in this specific embodiment (the maximum amplitude of the first-order vertical vortex-induced resonance is 0.071m / s 2 The maximum amplitude of the second-order vertical vortex-induced resonance is 2.400 m / s 2 ) is the arrangement height of the wind-breaking ribs. / 20, the number of arranged wind-breaking rib simulation members 2 is 4, and the 4 wind-breaking rib simulation members 2 are evenly arranged along the circumference of the rod simulation member 1, and the arrangement length of the wind-breaking rib simulation member 2 is the length of the rod simulation member 1.

[0179] ,

[0180] At the same time, it can be seen from Table 4 that the number of rectangular wind-breaking ribs increases and the circumferential arrangement interval of the rectangular wind-breaking ribs on the rod simulation member 1 is denser, but the vibration suppression effect is not good; at the same time, due to the influence of the rectangular wind-breaking ribs, the aerodynamic shape of the rod simulation member 1 is changed, and there is a phenomenon of prominent vibration under certain wind speeds. It can be seen that the unreasonable setting of the rod wind-breaking ribs can significantly amplify the structural response, and the acceleration response value surges by multiples. If it occurs, it will seriously threaten and damage the performance of the transmission tower rod 6. The configuration parameters of the tower wind-breaking rib 62 (the arrangement height, arrangement number and arrangement length of the wind-breaking ribs) are key parameters that affect the control effect, and their reasonable and accurate values ​​are crucial to the safety and reliability of the transmission tower rod 6. The resonance suppression design method of the transmission tower rod 6 of the present invention effectively solves the above problems.

[0181] Step 4) According to the target arrangement mode and the preset scale ratio, the actual arrangement height, arrangement quantity and arrangement length of the tower wind-breaking ribs 62 are converted and obtained, so that the tower wind-breaking ribs 62 are arranged according to the actual arrangement height, arrangement quantity and arrangement length of the tower wind-breaking ribs 62, so as to realize the resonance suppression of the transmission and transformation tower pole 6.

[0182] In the specific embodiment of Table 4, the arrangement height of the tower wind-breaking rib 62 is obtained by conversion: / 20, is the outer diameter of the transmission tower pole 6; the arrangement length of the tower pole wind-breaking rib 62 is the length of the transmission tower pole 6; the number of tower pole wind-breaking ribs 62 is 4, and the 4 tower pole wind-breaking ribs 62 are evenly arranged along the circumference of the transmission tower pole 6. In other embodiments, the setting parameters of the tower pole wind-breaking rib 62 can be adjusted according to actual conditions and the resonance suppression design method to ensure that the transmission tower pole resonance suppression effect is optimal.

[0183] Fig. 9 (a) is a rendering of a transmission and transformation tower pole 6 without adopting pneumatic measures, serving as a comparative example of a transmission and transformation tower pole 6 adopting pneumatic measures according to the present invention. Fig. 9 The acceleration response of the rod midpoint in is the acceleration response of the axial center (i.e., the axial 1 / 2 point) of the transmission tower rod 6. From the acceleration response of the rod midpoint, it can be seen that the first-order vortex vibration interval response amplitude of the rod simulation member 1 without control measures is 0.16m / s 2 ;at the same time, Fig. 9 The 1 / 4 point acceleration response is the average response of the second-order acceleration at the quarter point and three-quarter point of the axial direction of the transmission tower pole 6. From the 1 / 4 point acceleration response, it can be seen that the high-order vortex vibration under extreme weather conditions has two-order vortex-induced vibration in the wind speed range of 4-5m / s and 13-25m / s. Theoretically, the axial quarter point and three-quarter point responses are consistent, but in order to reduce installation or test errors, taking the average response of the second-order acceleration at the quarter point and three-quarter point can obtain more accurate test data.

[0184] Fig. 9 (b) is a rendering of the arrangement of the wind-breaking rib simulation member 2 on the rod simulation member 1 with the best control effect in this embodiment 1. It can be seen that the maximum amplitude of the first-order vertical vortex-induced resonance of the rod simulation member 1 is 0.071 m / s 2 , the vibration reduction rate reaches 60%, compared with Fig. 9 (a) The rod simulation method 1 without aerodynamic measures greatly suppresses the vortex-induced vibration of the rod; at the same time, the maximum amplitude of the second-order vertical vortex-induced resonance is 2.400m / s 2, and its vibration reduction rate for high-order vortex-induced vibrations occurring in extreme weather can reach more than 55%. It can be seen that the arrangement of the wind-breaking rib simulation member 2 of the present invention can achieve efficient resonance suppression for high-order vortex-induced vibrations in extreme weather in addition to conventional breeze vibrations.

[0185] Fig.10 The embodiment of the transmission tower pole 6 of the present invention is shown, the transmission tower pole 6 comprises a spoiler shell 61 and a tower pole wind-breaking rib 62 manufactured by adopting the resonance suppression design method of the transmission tower pole 6 of the above embodiment, and the tower pole wind-breaking rib 62 is arranged on the spoiler shell 61. The transmission tower pole 6 of the present invention also has the above advantages of the resonance suppression design method of the transmission tower pole, and has a simple and compact structure.

[0186] In this embodiment, when the transmission and transformation tower pole 6 vibrates in a breeze at a wind speed of 15m / s, a continuous energy input will be generated due to the stable external wind excitation. At this time, the tower wind-breaking rib 62 will interfere with the flow field near the transmission and transformation tower pole 6, destroy the Karman vortex, and suppress the vibration of the transmission and transformation tower pole 6. After the rectangular wind-breaking ribs of the present embodiment are arranged on the transmission tower pole 6 according to the above-mentioned resonance suppression design method, when the natural wind passes through the transmission tower pole 6 and the upper and lower airflows in the wake just form vortices, they are disrupted by the rectangular wind-breaking ribs on the upper and lower surfaces of the transmission tower pole 6. On this basis, the rectangular wind-breaking ribs on the front and rear surfaces of the transmission tower pole 6 act at the same time. The former first disrupts and separates the incoming wind, and the latter disturbs the disrupted airflow again. Under their joint action, the vortex area cannot form a stable vortex that alternates between upper and lower parts, and the entire transmission tower pole 6 area is covered by irregular turbulence. The air cannot give the transmission tower pole 6 a stable excitation force, so that the breeze vibration of the transmission tower pole 6 is greatly suppressed.

[0187] In this embodiment, the rectangular wind-breaking ribs and the spoiler shell 61 are made of high-strength, corrosion-resistant fiberglass. The spoiler shells 61 of adjacent transmission and transformation tower poles 6 are connected to each other through connecting clamps, which makes the spoiler shells 61 reliably fixed, easy to disassemble, low in cost, and good in appearance.

[0188] Example 2

[0189] Fig.11Another embodiment of the transmission and transformation tower pole member and the resonance suppression design method of the present invention is shown. This embodiment is basically the same as the previous embodiment, except that the wind-breaking rib simulation member 2 of this embodiment is set as a spiral wind-breaking rib, and the arrangement number of the wind-breaking rib simulation member 2 in the specified influencing factor of the wind-breaking rib simulation member 2 is replaced by the pitch of the spiral wind-breaking rib. After that, after determining the target arrangement of the spiral wind-breaking rib on the pole member simulation member 1, the actual arrangement height of the tower pole wind-breaking rib, the pitch of the tower pole wind-breaking rib and the arrangement length of the tower pole wind-breaking rib are obtained according to the target arrangement and the preset scale ratio conversion. In this embodiment, the tower pole wind-breaking rib can be made of flexible PVC material.

[0190] In a specific embodiment, the present invention adopts the resonance suppression design method described in the above embodiment 1 to obtain the optimal arrangement of the spiral wind-breaking ribs: the height of the spiral wind-breaking ribs is / 10, the pitch of the spiral wind-breaking rib is 12 The arrangement length of the spiral wind-breaking rib is the length of the rod simulation member 1.

[0191] Fig.12 (a) is a rendering of a transmission and transformation tower pole 6 without adopting pneumatic measures, serving as a comparative example of a transmission and transformation tower pole 6 adopting pneumatic measures in this embodiment. Fig.12 The acceleration response of the rod midpoint in is the acceleration response of the axial center (i.e., the axial 1 / 2 point) of the transmission tower rod 6. From the acceleration response of the rod midpoint, it can be seen that the first-order vortex vibration interval response amplitude of the rod simulation member 1 without control measures is 0.16m / s 2 ;at the same time, Fig.12 The 1 / 4 point acceleration response is the average response of the second-order acceleration at one-quarter and three-quarters of the axial direction of the transmission tower pole 6. From the 1 / 4 point acceleration response, it can be seen that the high-order vortex vibration under extreme weather conditions has two-order vortex-induced vibration in the wind speed range of 4~5m / s and 13-25m / s.

[0192] Figure 12 (b) is a rendering of the optimal arrangement of the spiral wind-breaking ribs on the rod simulation member 1 in Example 2. It can be seen that the first-order vortex-induced vibration of the rod simulation member 1 has basically disappeared, indicating that the airflow vortex has been completely disrupted. It can be seen that the arrangement of the spiral wind-breaking ribs on the rod simulation member 1 has an almost complete inhibitory effect on the first-order vortex-induced vibration of the rod simulation member 1; at the same time, its second-order vortex-induced vibration curve at high wind speed is compared with Fig.12 (a) For the transmission tower pole 6 without aerodynamic measures, the vortex-induced vibration wind speed range is also reduced to a certain extent, and the value of vortex-induced vibration is greatly reduced to 86.2%. It can be seen that the optimal arrangement of the spiral wind-breaking ribs in this embodiment can achieve efficient resonance suppression for high-order vortex-induced vibration in extreme weather in addition to breeze vibration.

[0193] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for designing resonance suppression of transmission tower poles, characterized in that: include: Constructing a rod simulation part simulating a transmission tower rod according to a preset scale ratio, and a wind-breaking rib simulation part simulating a tower rod wind-breaking rib on a transmission tower rod, wherein the wind-breaking rib simulation part is arranged on the outer surface of the rod simulation part; Simulate different arrangements of the wind-breaking rib simulation member on the rod simulation member to obtain simulation result values ​​corresponding to each arrangement, wherein the simulation result values ​​include test simulated wind acceleration, and each arrangement corresponds to a combination of different values ​​of two or more influencing factors of the wind-breaking rib simulation member, wherein the influencing factors include the arrangement height and arrangement length of the wind-breaking rib simulation member, and the test simulated wind acceleration is the acceleration of the rod simulation member under the test simulated wind; Compare the test simulated wind accelerations in the simulation result values ​​corresponding to each arrangement mode, and determine the arrangement mode corresponding to the minimum test simulated wind acceleration as the target arrangement mode of the wind-breaking rib simulation member on the rod simulation member; according to the target arrangement mode and the preset scale ratio, convert and obtain the actual arrangement height and arrangement length of the tower wind-breaking rib, so as to arrange the tower wind-breaking rib according to the obtained actual arrangement height and arrangement length of the tower wind-breaking rib, so as to realize the resonance suppression of the transmission and transformation tower; When constructing a rod simulation part simulating a transmission tower rod, and a wind-breaking rib simulation part simulating a tower rod wind-breaking rib on a transmission tower rod, it also includes constructing a support column simulation part and an adjustment clamp simulation part, wherein the support column simulation part is two support column simulation parts arranged opposite to each other perpendicular to the wind direction of the test simulated wind; the two ends of the rod simulation part are respectively installed horizontally or obliquely on the support column simulation part through an adjustment clamp simulation part; The adjustable clamp simulation component includes a clamp body, an annular adjustment disk connected to the clamp body, and a rotating plate connected to the rod simulation component. The rotating plate is provided with an adjusting arc surface adapted to the annular outer surface of the annular adjustment disk. The rotating plate can rotate circumferentially relative to the annular adjustment disk when the rod simulation component adjusts its angle, and can be limited and fixed when the rod simulation component is adjusted to a preset angle.

2. The resonance suppression design method for transmission and transformation tower poles according to claim 1 is characterized in that: The rod simulation member is a tubular rod member, and the rod simulation member for simulating the transmission and transformation tower rod member and the wind-breaking rib simulation member for simulating the wind-breaking rib on the transmission and transformation tower rod member include: Configuring configuration parameters of the rod simulation component, wherein the configuration parameters include the length, outer diameter, inner diameter, natural frequency and test simulation wind speed of the rod simulation component; the test simulation wind speed is the test vibration wind speed applied to the rod simulation component in the simulation scene; The length, outer diameter and inner diameter of the rod simulation member are determined according to the length, outer diameter and inner diameter of the transmission and transformation tower rod to be simulated, and the preset scale ratio; The natural frequency of the rod simulation component is calculated according to the length, outer diameter and inner diameter of the rod simulation component. The natural frequency of the rod simulation component includes the first-order natural frequency and the second-order and higher natural frequencies of the rod simulation component.

3. The resonance suppression design method for transmission and transformation tower poles according to claim 2 is characterized in that: The test simulation wind speed of the rod simulation member is configured, including: The natural frequency of the transmission and transformation tower pole is calculated according to the length, outer diameter and inner diameter of the transmission and transformation tower pole; According to the first-order natural frequency and the second-order and above natural frequencies in the natural frequency of the transmission and transformation tower pole, the vortex-vibration initiation wind speed of the transmission and transformation tower pole when the pole vibrates at different orders is determined, and a target vortex-vibration initiation wind speed that is less than a preset safety wind speed is selected from the vortex-vibration initiation wind speeds of the transmission and transformation tower pole when the pole vibrates at each order, and the selected target vortex-vibration initiation wind speed is used as the simulated initiation wind speed of the transmission and transformation tower pole; The test simulated wind speed of the pole simulation member is determined according to the simulated vibration wind speed of the transmission and transformation tower pole member and a preset wind speed ratio.

4. The resonance suppression design method for transmission and transformation tower poles according to claim 3 is characterized in that: The calculation formula for the vortex vibration initiation wind speed of the transmission tower pole when the pole vibrates at different orders is: in, is the vortex-induced vibration wind speed of the transmission and transformation tower poles, is the outer diameter of the transmission tower pole, is the Stothal number; It represents the natural frequency of any order of the transmission tower pole, among which the first-order natural frequency of the transmission tower pole is and the second-order natural frequencies of the transmission tower components The calculation formulas are: in, is the length of the transmission tower pole, is the elastic modulus of the transmission tower pole, is the density of the transmission tower poles, is the ratio of inner and outer diameters of the transmission tower pole, is the cross-sectional area of ​​the transmission tower pole, is the order of vibration of the transmission tower pole, It is the section inertia moment of the transmission tower pole in the vibration direction.

5. The resonance suppression design method for transmission and transformation tower poles according to any one of claims 1 to 4, characterized in that: Simulating different arrangements of the wind-breaking rib simulation member on the rod simulation member includes: At least two first values ​​are configured for the arrangement height of the wind-breaking rib simulation member, at least two second values ​​are configured for the designated influencing factor of the wind-breaking rib simulation member, and at least two third values ​​are configured for the arrangement length of the wind-breaking rib simulation member, wherein the first value is proportional to the outer diameter of the rod simulation member, and the third value is proportional to the length of the rod simulation member, when the wind-breaking rib simulation member is a rectangular wind-breaking rib, the designated influencing factor is the arrangement quantity of the wind-breaking rib simulation member; when the wind-breaking rib simulation member is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member; Selecting one of the first values, one of the second values, and one of the third values ​​from at least two of the first values, the second values, and the third values, respectively, to obtain a plurality of selection combinations, wherein at least one of the first values, the second values, and the third values ​​of different selection combinations is different; Orthogonal tests are performed on multiple groups of the selected combinations to obtain optimized selected combinations, which are used as multiple arrangements of wind-breaking rib simulation members on the rod simulation members.

6. The resonance suppression design method for transmission and transformation tower poles according to any one of claims 1 to 4, characterized in that: Simulating different arrangements of the wind-breaking rib simulation member on the rod simulation member includes: According to different values ​​of the influencing factors, three arrangement mode sets are established, and the three arrangement mode sets respectively use the arrangement height of the wind-breaking rib simulation member, the arrangement length of the wind-breaking rib simulation member, and one of the designated influencing factors determined according to the shape of the wind-breaking rib simulation member as fixed influencing factors with unchanged values; each of the arrangement mode sets includes a plurality of horizontal groups, and the number of the horizontal groups is the number of values ​​of the fixed influencing factors; each of the horizontal groups includes a plurality of arrangement modes, and each arrangement mode of the same horizontal group has different values ​​of influencing factors except the fixed influencing factors, wherein when the wind-breaking rib simulation member is a rectangular wind-breaking rib, the designated influencing factor is the arrangement number of the wind-breaking rib simulation member; when the wind-breaking rib simulation member is a spiral wind-breaking rib, the designated influencing factor is the pitch of the wind-breaking rib simulation member; Multi-factor variance analysis was used to conduct inter-group and intra-group variation of the horizontal groups in each layout set, as well as interactive variation analysis between layout sets, and the target influencing factors that have a significant impact on the experimental simulated wind acceleration were determined based on the analysis; A linear relationship is obtained based on the degree of influence of the determined target influencing factor on the test simulated wind acceleration. The in-group sums of squares of different level groups are multiplied by the normalized coefficients of the corresponding target influencing factors. The level group with the smallest product under each influencing factor is selected as the preferred level group. The interaction variance coefficient is used to weight each preferred level group to form a linear relationship. The result value of the linear relationship within the minimum or preset error range is determined as the theoretical optimal arrangement of the wind-breaking rib simulation part on the rod simulation part, and is used as a variety of arrangement methods of the wind-breaking rib simulation part on the rod simulation part.

7. The resonance suppression design method for transmission and transformation tower poles according to any one of claims 1 to 4, characterized in that: Simulate different arrangements of the wind-breaking rib simulation member on the rod simulation member to obtain simulation result values ​​corresponding to each arrangement, including: A detection device is provided, wherein the detection device includes an acceleration detection member, wherein the acceleration detection member includes a first-order acceleration detection member provided at the axial center of the rod simulation member, and a second-order acceleration detection member provided at one-quarter or three-quarters of the axial direction of the rod simulation member; The test simulated wind acceleration corresponding to each arrangement is obtained by using the detection device, wherein the test simulated wind acceleration includes the first-order vibration acceleration detected by the first-order acceleration detection component and the second-order vibration acceleration detected by the second-order acceleration detection component.

8. The resonance suppression design method for transmission and transformation tower poles according to claim 7, characterized in that: The detection device further comprises a wind speed detection member and / or a displacement detection member, wherein the wind speed detection member is arranged on the rod simulation member, and the wind speed detection member detects the simulated wind speed to obtain the corresponding wind speed when the rod simulation member starts to vibrate, stops vibrating and has the maximum vibration amplitude; The displacement detection component is arranged on the leeward side of the rod simulation component, the displacement detection component is arranged at the axial center of the rod simulation component, and at one quarter or three quarters of the axial direction of the rod simulation component, and the displacement detection component is used to detect the first-order vibration displacement and the second-order vibration displacement of the rod simulation component for comparison with the experimental simulated wind acceleration.

9. A transmission tower pole, characterized in that: It comprises a spoiler shell and a tower wind-breaking rib made by adopting the resonance suppression design method of a transmission and transformation tower pole according to any one of claims 1 to 8, wherein the tower wind-breaking rib is arranged on the spoiler shell.

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