Self-resetting variable-stiffness vibration double-control damper suitable for strut type electrical equipment and application of self-resetting variable-stiffness vibration double-control damper

Abstract

The invention relates to a self-resetting variable-stiffness vibration double-control damper suitable for supporting column type electrical equipment and application of the self-resetting variable-stiffness vibration double-control damper, and belongs to the technical field of vibration double control of the electrical equipment. In order to solve the problems that an existing damper is single in function and the like, the damper comprises an outer cylinder, an inner cylinder, an energy dissipation inner rod and an energy dissipation mechanism, the outer cylinder is of a two-section type splicing structure, the inner cylinder is coaxially arranged in the outer cylinder in a sleeved mode and connected with the outer cylinder through a first fastener, and the bottom of the inner cylinder is aligned with a splicing seam of the outer cylinder; the energy consumption inner rod is arranged in the outer cylinder in a penetrating mode, one end of the energy consumption inner rod extends out of the outer cylinder, the energy consumption mechanism is arranged in the outer cylinder, the energy consumption mechanism is distributed on the periphery of the energy consumption inner rod in the length direction of the energy consumption inner rod, high energy consumption capacity and reset capacity are achieved, variable-stiffness vibration double control and self-reset can be conducted, the safety of electrical equipment is improved, and residual deformation is reduced; a design method and a safety monitoring method are provided for the damper, the design efficiency and accuracy are improved, and safe and stable operation of equipment is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration and shock dual control for electrical equipment, and particularly relates to a self-resetting variable stiffness vibration and shock dual control damper applicable to pillar-type electrical equipment and its application. Background Art

[0002] China has a large east-west span of territory, with a terrain distributed in steps. It is located between the Eurasian Plate, the Pacific Plate and the Indian Ocean Plate. It is connected to the Eurasian seismic belt in the west and the circum-Pacific seismic belt in the east. It has a vast territory and a long coastline, facing the world's largest typhoon source, resulting in frequent natural disasters such as earthquakes, strong winds and rainfall in China. The electrical equipment in substations in China is inevitably built in locations with relatively high seismic intensities and strong wind speeds, and will inevitably be affected by multiple disasters such as earthquakes and strong winds during its entire life cycle.

[0003] Pillar-type electrical equipment is a main component of the power lifeline project and is expensive. Since the insulation part is composed of brittle porcelain bushings and its structure is slender, with a high center of gravity, high height and large mass, it is more sensitive to the effects of earthquakes and strong winds and has a higher vulnerability.

[0004] The dominant frequencies of wind and earthquake are different. Currently, the dampers for pillar-type electrical equipment usually target one type of disaster. At the same time, the residual deformation of electrical equipment will greatly reduce the ability of the electrical equipment to resist the recurrence of wind or earthquake. However, the existing dampers do not have the functions of vibration and shock dual control and self-resetting; at the same time, the current design and monitoring methods for vibration and shock dual control are relatively complex and mainly target building structures. Currently, there is no reasonable process and method applicable to pillar-type electrical equipment in the application process, which often has a great impact on the accuracy and efficiency of design and monitoring.

[0005] In view of the above practical problems, researching an efficient and reasonable self-resetting variable stiffness vibration and shock dual control damper, design method and safety monitoring method for pillar-type electrical equipment is an urgent problem to be solved by relevant researchers and industry technicians. Summary of the Invention

[0006] Aiming at the deficiencies existing in the above-mentioned prior art, the present invention aims to provide a self-resetting variable stiffness vibration and shock dual control damper applicable to pillar-type electrical equipment and its application. Based on the special shape of pillar-type electrical equipment, the functions of variable stiffness vibration and shock dual control and self-resetting of the damper are realized through the combination of two groups of disc springs and lead energy dissipation rings. At the same time, a design method for vibration and shock dual control of pillar-type electrical equipment and a safety monitoring method for vibration and shock during the operation of pillar-type electrical equipment are provided, which can cover the entire process of design and monitoring of the vibration and shock dual control damper for pillar-type electrical equipment, and effectively solve the problems existing in the above-mentioned background art part.

[0007] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows:

[0008] The technical solution of the first aspect provided by the present invention is as follows: A self-resetting variable stiffness vibration and shock dual-control damper, which includes an outer cylinder, an inner cylinder, an energy-consuming inner rod, and an energy-consuming mechanism. The inner cylinder is coaxially disposed inside the outer cylinder and connected to the outer cylinder through a first fastener. The energy-consuming inner rod is disposed in the outer cylinder and penetrates through the inner cylinder. The energy-consuming mechanism is disposed inside the outer cylinder and is distributed along the length direction of the energy-consuming inner rod on its outer periphery.

[0009] As a further preferred solution of the above technical solution: The outer cylinder is a hollow cylindrical shape with one end closed and one end open, which includes an upper outer cylinder and a lower outer cylinder. The upper outer cylinder and the lower outer cylinder are connected through a second fastener, and a third fastener is provided at the open end of the upper outer cylinder. The inner cylinder is located inside the upper outer cylinder and is connected to the upper outer cylinder through a first fastener. The lower end of the inner cylinder is aligned with the lower end of the upper outer cylinder and the upper end of the lower outer cylinder.

[0010] As a further preferred solution of the above technical solution: A fourth fastener, a first energy-consuming plate, an extrusion energy-consuming head, and a second energy-consuming plate are provided on the energy-consuming inner rod. A plurality of fourth fasteners are provided and are all located outside the outer cylinder. The first energy-consuming plate, the extrusion energy-consuming head, and the second energy-consuming plate are sequentially located inside the outer cylinder from top to bottom. Among them, the first energy-consuming plate is located in the middle upper section of the upper outer cylinder, the extrusion energy-consuming head is located in the middle section of the inner cylinder, and the second energy-consuming plate is located in the middle section of the lower outer cylinder.

[0011] As a further preferred solution of the above technical solution: The energy-consuming mechanism includes a first disc spring group, a lead energy-consuming ring, and a second disc spring group that are sequentially distributed from top to bottom. Two first disc spring groups and two second disc spring groups are provided respectively. The two first disc spring groups are fixedly connected between the upper outer cylinder and the inner cylinder and are closely distributed on both sides of the first energy-consuming plate. The two second disc spring groups are fixedly connected between the lower outer cylinder and the inner cylinder and are located on both sides of the second energy-consuming plate. And a movable gap is reserved between the second disc spring group and the second energy-consuming plate. The lead energy-consuming ring is fixedly connected to the inner cylinder and is located between the inner cylinder and the extrusion energy-consuming head.

[0012] The technical solution of the second aspect provided by the present invention is as follows: A pillar-type electrical equipment, which includes a self-resetting variable stiffness vibration and shock dual-control damper described in any one of the above.

[0013] As a further preferred solution of the above technical solution: The self-resetting variable stiffness vibration and shock dual-control damper is installed between the equipment and the bracket. A spherical hinge is provided at the connection between the bottom plate of the equipment and the top plate of the bracket. The self-resetting variable stiffness vibration and shock dual-control damper is arranged in a circumferential direction with central symmetry. The upper part of the self-resetting variable stiffness vibration and shock dual-control damper is connected to the bottom plate of the equipment through a fourth fastener, and the lower part of the self-resetting variable stiffness vibration and shock dual-control damper is connected to the top plate of the bracket through a third fastener.

[0014] The technical solution of the third aspect provided by the present invention is as follows: A method for the vibration and shock dual-control design of a pillar-type electrical equipment, which includes the following steps:

[0015] Step 1: Based on the dimensions of the pillar-type electrical equipment and the conditions of the substation site where it is located, establish a three-dimensional finite element model of the pillar-type electrical equipment;

[0016] Step 2: Conduct vibration reduction design based on the three-dimensional finite element model, and preliminarily determine the two-part vertical stiffness of the self-resetting variable stiffness vibration and shock dual-control damper. The two-part vertical stiffness includes the size of the first disc spring group, the size of the lead energy dissipation ring, and the size of the second disc spring group;

[0017] Step 3: Conduct seismic isolation design based on the three-dimensional finite element model, and further adjust the size of the second disc spring group on the basis of Step 2 to determine the final parameters of the self-resetting variable stiffness vibration and shock dual-control damper.

[0018] A further preferred solution of the above technical solution is as follows: The process of vibration reduction design in Step 2 is as follows:

[0019] Step 201: Calculate the wind load of the substation where it is located, and clarify the self-vibration characteristics of the pillar-type electrical equipment;

[0020] Step 202: Arrange a self-resetting variable stiffness vibration and shock dual-control damper between the pillar-type electrical equipment and the bracket to obtain the size of the first disc spring group, the size of the lead energy dissipation ring, and the size of the second disc spring group of the self-resetting variable stiffness vibration and shock dual-control damper;

[0021] Step 203: Conduct a wind load dynamic response analysis on the pillar-type electrical equipment, evaluate the operation stability of the pillar-type electrical equipment according to the analysis results, clarify whether the wind load has an impact on the stable operation of the pillar-type electrical equipment. If not satisfied, adjust the size of the first disc spring group and the size of the lead energy dissipation ring, and repeat Step 202 - Step 203 until the operation stability evaluation is passed;

[0022] Step 204: Obtain the preliminarily determined size of the first disc spring group, the size of the lead energy dissipation ring, and the size of the second disc spring group.

[0023] A further preferred solution is as follows: The process of seismic isolation design in Step 3 is as follows:

[0024] Step 301: Design a seismic test to further adjust the size of the second disc spring group determined preliminarily;

[0025] Step 302: Conduct a seismic dynamic response analysis on the pillar-type electrical equipment, evaluate the safety of the pillar-type electrical equipment according to the analysis results, clarify that the earthquake will not have a destructive impact on the pillar-type electrical equipment within the allowable ground peak acceleration specified in the code. If not satisfied, re-adjust the size of the first disc spring group and the size of the lead energy dissipation ring until the operation stability evaluation is passed, and then repeat Step 301 - Step 302 to adjust the size of the second disc spring group until the seismic isolation check meets the standards;

[0026] Step 303: Design the vibration and shock dual-control scheme for the pillar-type electrical equipment according to the finally determined sizes of the first disc spring group, the lead energy dissipation ring, and the second disc spring group.

[0027] The technical solution provided in the fourth aspect of the present invention is: A vibration and shock safety monitoring method for pillar-type electrical equipment, including the following steps:

[0028] S1: Arrange wireless transmission vibration pickups for collecting real-time acceleration values and wind pressure sensors for wind speed on the flange of the pillar-type electrical equipment to monitor the vibration and shock of the pillar-type electrical equipment, and judge whether there is any abnormal situation. If so, perform corresponding processing;

[0029] S2: Install displacement sensors between the support foundation, the bottom plate of the equipment and the top plate of the support to monitor and record the overall deformation of the pillar-type electrical equipment, and judge whether there is any abnormal situation. If so, perform corresponding processing;

[0030] S3: Evaluate the damage conditions of the pillar-type electrical equipment and the self-resetting variable stiffness vibration and shock dual-control damper according to the monitoring data obtained in steps S1 - S2. If it is clear that damage has occurred, perform corresponding repairs or replacements on the pillar-type electrical equipment or the self-resetting variable stiffness vibration and shock dual-control damper.

[0031] Compared with the prior art, the improvements of the present invention can produce the following beneficial effects:

[0032] 1. The self-resetting variable stiffness vibration and shock dual-control damper of the present invention combines vibration and shock dual-control, combines the first disc spring group, the second disc spring group and the lead energy dissipation ring by controlling the stroke, realizes variable stiffness during the vibration / shock process, effectively absorbs and dissipates vibration / shock energy, significantly reduces the displacement and acceleration under the action of vibration / shock, extends the natural vibration period of the pillar-type electrical equipment, and reduces the risk of damage to the pillar-type electrical equipment.

[0033] 2. The first disc spring group in the present invention drives the first energy dissipation plate, the energy dissipation inner rod and the top plate of the support to realize self-resetting of the pillar-type electrical equipment, reduces the residual deformation, and greatly improves the safety of the pillar-type electrical equipment.

[0034] 3. The installation of the self-resetting variable stiffness vibration and shock dual-control damper of the present invention does not change the existing installation connection method of the equipment, and has the advantages of simple structure, low cost, easy installation, easy maintenance, and convenient factory manufacturing, has high practical value and stable energy consumption, and at the same time has good durability.

[0035] 4. Compared with the prior art, the present invention not only solves the problem of energy consumption caused by vibration / shock of electrical equipment, but also provides a vibration reduction and isolation design method and a safety monitoring method during the operation of pillar-type electrical equipment, improving the design efficiency and accuracy, achieving the purpose of vibration / shock monitoring and safety assessment, clarifying damage, giving early warnings, reducing losses, and ensuring the stable and safe operation of pillar-type electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention.

[0037] Figure 1 It is a schematic cross-sectional view of the overall structure of the self-resetting variable stiffness vibration / shock dual-control damper for pillar-type electrical equipment of the present invention;

[0038] Figure 2 It is along the Figure 1 cross-sectional structure schematic diagram in the A direction of the overall structure of the present invention;

[0039] Figure 3 It is a schematic plan view of the overall structure of the self-resetting variable stiffness vibration / shock dual-control damper for pillar-type electrical equipment of the present invention;

[0040] Figure 4 It is an installation schematic diagram of the self-resetting variable stiffness vibration / shock dual-control damper and related sensors for pillar-type electrical equipment of the present invention;

[0041] Figure 5 It is an installation schematic diagram of related sensors at the top of the electrical equipment of the present invention;

[0042] Figure 6 It is an installation schematic diagram of related sensors at the foundation of the electrical equipment of the present invention;

[0043] Figure 7 It is a flowchart of the vibration / shock dual-control design method for pillar-type electrical equipment of the present invention;

[0044] Figure 8 It is a flowchart of the vibration / shock safety monitoring method during the operation of pillar-type electrical equipment of the present invention;

[0045] In the figure: 1. Outer cylinder; 101. Upper outer cylinder; 102. Lower outer cylinder; 103. Second fastener; 104. Third fastener; 2. Inner cylinder; 201. First fastener; 3. Energy-consuming inner rod; 301. Fourth fastener; 302. First energy-consuming plate; 303. Extrusion energy-consuming head; 304. Second energy-consuming plate; 4. First disc spring group; 5. Lead energy-consuming ring; 6. Second disc spring group; 7. Bottom plate of the equipment; 8. Ball hinge; 9. Top plate of the bracket; 10. Flange; 11. Bracket foundation; 12. Wireless transmission vibration pick-up; 13. Displacement sensor; 14. Wind pressure sensor. Specific embodiments

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention.

[0047] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0048] Refer to Figures 1-8 , the present invention discloses a self-resetting variable stiffness vibration and shock dual-control damper applicable to pillar-type electrical equipment and its application, including a self-resetting variable stiffness vibration and shock dual-control damper, a pillar-type electrical equipment based on the self-resetting variable stiffness vibration and shock dual-control damper, a vibration and shock dual-control design method for pillar-type electrical equipment, and a running vibration and shock safety monitoring method for pillar-type electrical equipment. The following is a detailed description of the technical solutions of the present invention in combination with Embodiment 1 to Embodiment 3.

[0049] Embodiment 1:

[0050] As Figures 1-3 shown, a self-resetting variable stiffness vibration and shock dual-control damper includes an outer cylinder 1, an inner cylinder 2, an energy-consuming inner rod 3, and an energy-consuming mechanism. The outer cylinder 1 adopts a two-section splicing structure. The inner cylinder 2 is coaxially sleeved inside the outer cylinder 1 and is connected to the outer cylinder 1 through a first fastener 201. Preferably, the first fastener 201 adopts, for example, Figure 2The inner cylinder connecting bolt shown is installed such that the bottom of the inner cylinder 2 is aligned with the splicing seam of the outer cylinder 1. The energy dissipation inner rod 3 passes through the outer cylinder 1 and one end thereof extends out of the outer cylinder 1. The energy dissipation mechanism is arranged inside the outer cylinder 1 and is distributed along the length direction of the energy dissipation inner rod 3 on its outer periphery.

[0051] Specifically, the outer cylinder 1 is a hollow cylindrical shape with one end closed and one end open, and it includes an upper outer cylinder 101 and a lower outer cylinder 102. The upper outer cylinder 101 and the lower outer cylinder 102 are connected by a second fastener 103. Preferably, the second fastener 103 is Figure 1 the outer cylinder connecting bolt shown, and a third fastener 104 is arranged at the open end of the upper outer cylinder 101. The third fastener 104 is Figure 1 、 Figure 3 the outer cylinder anchoring nut shown. The inner cylinder 2 is located inside the upper outer cylinder 101, and the inner cylinder 2 and the upper outer cylinder 101 are connected by a first fastener 201. The lower end of the inner cylinder 2 is aligned with the lower end of the upper outer cylinder 101 and the upper end of the lower outer cylinder 102.

[0052] As Figure 3 shown, a fourth fastener 301, a first energy dissipation plate 302, an extrusion energy dissipation head 303, and a second energy dissipation plate 304 are arranged on the energy dissipation inner rod 3. The first energy dissipation plate 302, the extrusion energy dissipation head 303, and the second energy dissipation plate 304 are sequentially connected to one end of the energy dissipation inner rod 3 located inside the open end of the outer cylinder 1 from top to bottom. In this embodiment, the fourth fastener 301 is threadedly connected to the outer end of the energy dissipation inner rod 3. There are three fourth fasteners 301, and they are Figure 1 、 Figure 3 the inner rod anchoring nuts shown. The fourth fastener 301 is connected to one end of the energy dissipation inner rod 3 located outside the open end of the outer cylinder 1. The two fourth fasteners 301 close to the outer end of the energy dissipation inner rod 3 are tightly connected, and there is a gap between one fourth fastener 301 far from the outer end of the energy dissipation inner rod 3 and the adjacent fourth fastener 301.

[0053] Combined with Figure 1 shown, in some preferred embodiments, the first energy dissipation plate 302, the extrusion energy dissipation head 303, the second energy dissipation plate 304, and the energy dissipation inner rod 3 are all integrally formed. Among them, the first energy dissipation plate 302 is located in the middle upper section of the upper outer cylinder 101, the extrusion energy dissipation head 303 is located in the middle section of the inner cylinder 2, and the second energy dissipation plate 304 is located in the middle section of the lower outer cylinder 102.

[0054] In this embodiment, the description is based on the orientation of the self - reset variable stiffness vibration and shock dual - control damper during use. As Figure 1As shown in the figure, the energy dissipation mechanism includes a first disc spring group 4, a lead energy dissipation ring 5, and a second disc spring group 6 that are distributed in sequence from top to bottom. There are two first disc spring groups 4 and two second disc spring groups 6 respectively. The two first disc spring groups 4 are fixedly connected between the upper outer cylinder 101 and the inner cylinder 2 and are closely distributed on both sides of the first energy dissipation plate 302. The two second disc spring groups 6 are fixedly connected between the lower outer cylinder 102 and the inner cylinder 2 and are located on both sides of the second energy dissipation plate 304. And there is an activity gap reserved between the second disc spring group 6 and the second energy dissipation plate 304. The lead energy dissipation ring 5 is fixedly connected in the inner cylinder 2, and the lead energy dissipation ring 5 is located between the inner cylinder 2 and the extrusion energy dissipation head 303.

[0055] In this embodiment, the self-resetting variable stiffness vibration and shock double-control damper is installed between the equipment and the bracket or between the bracket and the foundation. Preferably, the method of installing between the equipment and the bracket is selected. Combined with Figure 4 As shown in the figure, a spherical hinge 8 is provided at the connection between the bottom plate 7 of the equipment and the top plate 9 of the bracket. The self-resetting variable stiffness vibration and shock double-control damper is arranged in a circumferential direction with central symmetry. The upper part of the self-resetting variable stiffness vibration and shock double-control damper is connected to the bottom plate 7 of the equipment through the fourth fastener 301, and the lower part of the self-resetting variable stiffness vibration and shock double-control damper is connected to the top plate 9 of the bracket through the third fastener 104.

[0056] The working principle of a self-resetting variable stiffness vibration and shock double-control damper applicable to pillar-type electrical equipment is as follows:

[0057] (1) In the normal use stage, when the pillar-type electrical equipment encounters wind vibration, it will sway slightly, and there will be a small vertical relative displacement between the bottom plate 7 of the equipment and the top plate 9 of the bracket. The elastic support is realized through the first disc spring group 4 with lower vertical stiffness and the lead energy dissipation ring 5 of the self-resetting variable stiffness vibration and shock double-control damper, reducing the vertical vibration of the pillar-type electrical equipment, avoiding the dominant frequency of the wind load, and reducing the influence of the wind load on the substation system;

[0058] (2) When the pillar-type electrical equipment encounters earthquake action, its swaying amplitude increases, and the vertical relative displacement between the bottom plate 7 of the equipment and the top plate 9 of the bracket increases, and the stroke is greater than the activity gap between the second disc spring group 6 and the second energy dissipation plate 304 of the self-resetting variable stiffness vibration and shock double-control damper. The second disc spring group 6, the first disc spring group 4, and the lead energy dissipation ring 5 work together in parallel, and the vertical stiffness increases, improving the vertical bearing capacity of the pillar-type electrical equipment; if the vertical relative displacement between the bottom plate 7 of the equipment and the top plate 9 of the bracket is too large to generate an uplift force, the excessive upward displacement and slippage of the first energy dissipation plate 302 and the second energy dissipation plate 304 are blocked by the first disc spring group 4 and the second disc spring group 6, improving the anti-overturning and anti-pulling capabilities of the self-resetting variable stiffness vibration and shock double-control damper;

[0059] (3) After the vibration / shock ends, the first disc spring group 4 drives the first energy dissipation plate 302, the energy dissipation inner rod 3 and the top plate 9 of the bracket to achieve self-resetting of the pillar-type electrical equipment, reducing residual deformation.

[0060] Embodiment 2:

[0061] A pillar-type electrical equipment includes the self-resetting variable stiffness vibration / shock double-control damper described above. Referring to Figure 7 as shown, on the basis of the above Embodiment 1, this embodiment also proposes a vibration / shock double-control design method for pillar-type electrical equipment, including the following steps:

[0062] Step 1: Define the dimensions of the pillar-type electrical equipment and the conditions of the substation site where it is located, including altitude, environmental temperature, average maximum temperature in the hottest month, ground roughness, design wind speed, seismic fortification intensity, design basic seismic acceleration, and site category. Based on the above conditions, establish a three-dimensional finite element model of the pillar-type electrical equipment;

[0063] Step 2: Conduct vibration reduction design based on the three-dimensional finite element model, and preliminarily determine the two vertical stiffnesses of the self-resetting variable stiffness vibration / shock double-control damper. The two vertical stiffnesses include the dimensions of the first disc spring group 4, the lead energy dissipation ring 5, and the second disc spring group 6;

[0064] In this step, first calculate the wind load of the substation where it is located, including average wind calculation and pulsating wind calculation. Among them, the calculation formula for the average wind is:

[0065]

[0066] In the formula: z b , are the standard reference height and the average wind speed at that place respectively; z, are any height and the average wind speed at that place respectively; α is the ground roughness index;

[0067] The calculation formula for the pulsating wind is:

[0068]

[0069] In the formula: f is the frequency; is the overall turbulence scale; k is the coefficient reflecting the ground roughness; V 10 is the average wind speed at a height of 10m.

[0070] At the same time, clarify the natural vibration characteristics of the pillar-type electrical equipment before the damper is installed;

[0071] Next is the arrangement of the self - resetting variable - stiffness vibration - shock dual - control damper and the preliminary determination of its dual stiffness. Specifically, install the self - resetting variable - stiffness vibration - shock dual - control damper between the pillar - type electrical equipment and the support. The self - resetting variable - stiffness vibration - shock dual - control dampers are distributed in a circumferential pattern with central symmetry. According to relevant factors such as the mass of the pillar - type electrical equipment in the substation, preliminarily determine the two - part vertical stiffness of the self - resetting variable - stiffness vibration - shock dual - control damper, including relevant parameters such as the size of the first disc spring group 4, the size of the lead energy - dissipating ring 5, and the size of the second disc spring group 6;

[0072] Then, conduct a dynamic response analysis of the pillar - type electrical equipment under wind load. Based on the analysis results, evaluate the operational stability of the pillar - type electrical equipment. The evaluation indicators include the stress, acceleration, and displacement of each part of the equipment, and clarify whether the wind load affects the stable operation of the pillar - type electrical equipment. If there is an impact, adjust relevant parameters such as the size of the first disc spring group 4 and the size of the lead energy - dissipating ring 5, and repeat the above steps until the operational stability evaluation is passed;

[0073] Finally, preliminarily determine the two - part vertical stiffness of the self - resetting variable - stiffness vibration - shock dual - control damper, including relevant parameters such as the size of the first disc spring group 4, the size of the lead energy - dissipating ring 5, and the size of the second disc spring group 6.

[0074] Step 3: Conduct seismic isolation design based on the three - dimensional finite - element model, and further adjust the size of the second disc spring group 6 on the basis of Step 2 to determine the final parameters of the self - resetting variable - stiffness vibration - shock dual - control damper.

[0075] In this step, first, it is necessary to clarify the seismic action, design a seismic test according to the provisions of the "Code for Seismic Design of Electric Power Facilities" (GB 50260 - 2013). When using the dynamic time - history analysis method for seismic design, at least three sets of ground motion time - histories should be input, and the artificial wave should not be less than one set. The duration of the ground motion time - history should not be less than 30 s, and the strong - motion part should not be less than 6 s;

[0076] Secondly, it is the adjustment of the second - order stiffness of the self - resetting variable - stiffness vibration - shock dual - control damper. On the basis of the two - part vertical stiffness of the self - resetting variable - stiffness vibration - shock dual - control damper preliminarily determined in the above Step 2, further adjust the size of the second disc spring group 6;

[0077] Then, perform seismic dynamic response analysis on the pillar-type electrical equipment. Based on the analysis results, conduct safety evaluation on the pillar-type electrical equipment. The evaluation indicators include the stress, acceleration, and displacement of each part of the equipment, and clarify that within the allowable ground peak acceleration specified in the code, the earthquake will not cause destructive effects on the pillar-type electrical equipment. If not satisfied, re-adjust the vertical stiffness of the vibration control part of the self-resetting variable stiffness vibration and shock dual-control damper, including relevant parameters such as the size of the first disc spring group 4 and the size of the lead energy dissipation ring 5, until the operation stability evaluation passes. Then, repeat the steps of the seismic isolation design, adjust the vertical stiffness of the vibration control part of the self-resetting variable stiffness vibration and shock dual-control damper, including relevant parameters such as the size of the second disc spring group 6, until the seismic isolation check in the vibration and shock dual-control bearing meets the standards;

[0078] Finally, determine the final parameters of the vertical stiffness of the two parts of the self-resetting variable stiffness vibration and shock dual-control damper (including the size of the first disc spring group 4, the size of the lead energy dissipation ring 5, the size of the second disc spring group 6, etc.), and conduct the design of the vibration and shock dual-control scheme for the pillar-type electrical equipment.

[0079] Embodiment 3:

[0080] Refer to Figure 8 As shown, a method for monitoring the vibration and shock safety of pillar-type electrical equipment includes the following steps:

[0081] S1: Vibration and shock monitoring: Arrange a wireless transmission vibration pick-up 12 for collecting real-time acceleration values and a wind pressure sensor for wind speed on the flange 10 of the pillar-type electrical equipment, conduct vibration and shock monitoring on the pillar-type electrical equipment, and judge whether there is any abnormal situation. If there is an abnormal situation, corresponding treatment shall be carried out;

[0082] S2: Deformation monitoring: Install displacement sensors 13 between the support foundation 11, the bottom plate 7 of the equipment, and the top plate 9 of the support, monitor and record the overall deformation of the pillar-type electrical equipment, and judge whether there is any abnormal situation. If there is an abnormal situation, corresponding treatment shall be carried out;

[0083] S3: Safety assessment of pillar-type electrical equipment: According to the monitoring data obtained in steps S1 - S2, evaluate the damage conditions of the pillar-type electrical equipment and the self-resetting variable stiffness vibration and shock dual-control damper, locate the damage position. If it is clear that damage has occurred, corresponding repair or replacement shall be carried out on the pillar-type electrical equipment or the self-resetting variable stiffness vibration and shock dual-control damper.

[0084] The above abnormal situations and treatments include at least one of the following:

[0085] At present, the acceleration values and wind speeds of the corresponding areas collected by each wireless transmission vibration pickup 12 and the wind pressure sensor 14 are compared with the acceleration values and wind speeds collected in the same area previously, and it is judged whether the deviation value between the two is greater than a predetermined value. If the deviation between the two is greater than or equal to the predetermined value, it is judged that there is an abnormal situation and corresponding processing is carried out;

[0086] When the equipment is subjected to external excitation (wind / earthquake), the self-vibration frequency of the equipment is analyzed by comprehensively using all the wireless transmission vibration pickups 12, and the self-vibration frequency of the equipment previously synthesized is compared to obtain the degree of change in the self-vibration frequency of the equipment, and it is judged whether the change deviation value is greater than a predetermined value. If the change deviation value is greater than or equal to the predetermined value, it is judged that there is an abnormal situation and corresponding processing is carried out.

[0087] The displacement sensor 13 collects the real-time displacement data of the pillar-type electrical equipment, and judges whether the fluctuation is abnormal according to the real-time displacement data. If the fluctuation is greater than the predetermined range, the pillar-type electrical equipment and the self-resetting variable stiffness vibration and shock double-control damper are repaired or replaced in time to prevent affecting the power supply.

[0088] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-resetting variable stiffness vibration dual-control damper, characterized in that: The invention comprises an outer cylinder (1), an inner cylinder (2), an energy-absorbing inner rod (3) and an energy-absorbing mechanism. The inner cylinder (2) is coaxially arranged inside the outer cylinder (1) and connected to the outer cylinder (1) via a first fastener (201). One end of the energy-absorbing inner rod (3) is arranged inside the outer cylinder (1) and passes through the inner cylinder (2). The energy-absorbing mechanism is arranged inside the outer cylinder (1) and is distributed on the periphery of the energy-absorbing inner rod (3) along its length direction.

2. The self-resetting variable stiffness dual-control vibration damper according to claim 1, characterized in that: The outer cylinder (1) comprises an upper outer cylinder (101) and a lower outer cylinder (102); the upper outer cylinder (101) and the lower outer cylinder (102) are connected via a second fastener (103); a third fastener (104) is provided at the open end of the upper outer cylinder (101); the inner cylinder (2) is located inside the upper outer cylinder (101); the inner cylinder (2) and the upper outer cylinder (101) are connected via a first fastener (201); the lower end of the inner cylinder (2) is aligned with the lower end of the upper outer cylinder (101) and the upper end of the lower outer cylinder (102).

3. The self-resetting variable stiffness dual-control vibration damper according to claim 2, characterized in that: The energy-absorbing inner rod (3) is provided with a fourth fastener (301), a first energy-absorbing plate (302), an extrusion energy-absorbing head (303) and a second energy-absorbing plate (304). A plurality of fourth fasteners (301) are provided and are all located outside the outer cylinder (1). The first energy-absorbing plate (302), the extrusion energy-absorbing head (303) and the second energy-absorbing plate (304) are located inside the outer cylinder (1) in sequence from top to bottom. The first energy-absorbing plate (302) is located in the middle upper section of the upper outer cylinder (101), the extrusion energy-absorbing head (303) is located in the middle section of the inner cylinder (2), and the second energy-absorbing plate (304) is located in the middle section of the lower outer cylinder (102).

4. The self-resetting variable stiffness dual-control vibration damper according to claim 3 is characterized in that: The energy dissipation mechanism comprises a first disc spring group (4), a lead energy dissipation ring (5) and a second disc spring group (6) which are sequentially arranged from top to bottom. Two first disc spring groups (4) and two second disc spring groups (6) are respectively arranged. The two first disc spring groups (4) are fixedly connected between the upper outer cylinder (101) and the inner cylinder (2) and are closely arranged on both sides of the first energy dissipation plate (302). The two second disc spring groups (6) are fixedly connected between the lower outer cylinder (102) and the inner cylinder (2) and are located on both sides of the second energy dissipation plate (304). A movable gap is reserved between the second disc spring group (6) and the second energy dissipation plate (304). The lead energy dissipation ring (5) is fixedly connected in the inner cylinder (2), and the lead energy dissipation ring (5) is located between the inner cylinder (2) and the extrusion energy dissipation head (303).

5. A pillar type electrical equipment, characterized in that: A self-resetting variable stiffness vibration dual-control damper comprising any one of claims 1-4.

6. A pillar-type electrical equipment according to claim 5, characterized in that: The self-resetting variable stiffness vibration dual-control damper is installed between the equipment and the bracket. A ball joint (8) is provided at the connection between the bottom plate (7) of the equipment and the top plate (9) of the bracket. The self-resetting variable stiffness vibration dual-control damper is arranged in a centrally symmetrical annular direction. The top of the self-resetting variable stiffness vibration dual-control damper is connected to the bottom plate (7) of the equipment via a fourth fastener (301), and the bottom of the self-resetting variable stiffness vibration dual-control damper is connected to the top plate (9) of the bracket via a third fastener (104).

7. A vibration dual control design method for pillar-type electrical equipment according to any one of claim 6, characterized in that: The following steps are involved: Step 1: Based on the size of the pillar electrical equipment and the site conditions of the substation where it is located, establish a three-dimensional finite element model of the pillar electrical equipment; Step 2: Based on the three-dimensional finite element model, the vibration reduction design is performed to preliminarily determine the vertical stiffness of the two parts of the self-resetting variable stiffness vibration dual-control damper, which includes the size of the first disc spring group (4), the size of the lead energy dissipation ring (5), and the size of the second disc spring group (6); Step 3: Perform seismic isolation design based on the three-dimensional finite element model, and further adjust the size of the second disc spring group (6) based on step 2 to determine the final parameters of the self-resetting variable stiffness vibration dual-control damper.

8. A vibration dual control design method for pillar-type electrical equipment according to claim 7, characterized in that: The process of vibration reduction design in step 2 is as follows: Step 201: Calculate the wind load of the substation and clarify the natural vibration characteristics of the pillar electrical equipment; Step 202: a self-resetting variable stiffness vibration dual-control damper is arranged between the pillar-type electrical equipment and the bracket, and the size of the first disc spring group (4), the size of the lead energy dissipation ring (5), and the size of the second disc spring group (6) of the self-resetting variable stiffness vibration dual-control damper are obtained; Step 203: Perform wind load dynamic response analysis on the pillar-type electrical equipment, and perform operation stability evaluation based on the analysis results to determine whether the wind load has an impact on the stable operation of the pillar-type electrical equipment. If not, adjust the size of the first disc spring group (4) and the size of the lead energy dissipation ring (5), and repeat steps 202 to 203 until the operation stability evaluation is passed; Step 204: Obtain the preliminarily determined dimensions of the first disc spring group (4), the lead energy dissipation ring (5), and the second disc spring group (6).

9. A vibration dual control design method for pillar-type electrical equipment according to claim 8, characterized in that: The process of seismic isolation design in step 3 is as follows: Step 301: Design a seismic test and further adjust the size of the second disc spring group (6) that has been initially determined; Step 302: Perform earthquake dynamic response analysis on the pillar-type electrical equipment, and perform safety evaluation based on the analysis results to make it clear that the earthquake will not have a destructive effect on the pillar-type electrical equipment within the ground peak acceleration allowed by the specification. If it is not satisfied, readjust the size of the first disc spring group (4) and the size of the lead energy dissipation ring (5) until the operation stability evaluation is passed, and then repeat steps 301-302 to adjust the size of the second disc spring group (6) until the seismic isolation verification meets the standard; Step 303: Design a dual vibration control scheme for pillar-type electrical equipment based on the finally determined size of the first disc spring group (4), the size of the lead energy dissipation ring (5), and the size of the second disc spring group (6).

10. A vibration safety monitoring method for pillar-type electrical equipment according to claim 6, characterized in that: The following steps are involved: S1: Arrange a wireless transmission vibration pickup (12) for collecting real-time acceleration values ​​and a wind speed and pressure sensor on the flange (10) of the pillar-type electrical equipment, monitor the vibration of the pillar-type electrical equipment, determine whether there is any abnormality, and if so, perform corresponding processing; S2: Install a displacement sensor (13) between the support base (11), the bottom plate (7) of the equipment and the top plate (9) of the support to monitor and record the overall deformation of the pillar-type electrical equipment, determine whether there is any abnormality, and if so, take corresponding measures; S3: Based on the monitoring data obtained from step S1-step S2, the damage of the pillar-type electrical equipment and the self-resetting variable stiffness vibration dual-control damper is evaluated. If damage is clearly caused, the pillar-type electrical equipment or the self-resetting variable stiffness vibration dual-control damper is repaired or replaced accordingly.

Images