Tuned mass vibration absorption device for aeolian vibration of steel tube tower rod piece

Abstract

The invention belongs to the technical field of wind vibration control of power equipment, and provides a tuned mass vibration absorption device for aeolian vibration of a steel tube tower rod piece, comprising spring pieces (1) which are uniformly arranged along the circumferential direction of a steel tube; a plurality of holes are formed in the spring piece (1); the arc-shaped hoops (3) are uniformly arranged along the circumferential direction of the steel pipe; every two adjacent arc-shaped hoops (3) penetrate through the middles of the corresponding spring pieces (1) through bolts to be connected in a fastened mode, and the middles of the spring pieces (1) are wrapped with damping gaskets (101). The two ends of each spring piece (1) are connected with the mass blocks (2) respectively. The annular hoops (4) are arranged at the two ends of the spring piece (1) and arranged on the outer side of the steel pipe, a plurality of metal plates (401) are evenly embedded into the annular hoops (4) in the circumferential direction of the steel pipe, and the center of each metal plate (401) is aligned with the center of the corresponding mass block (2).

Description

Technical Field

[0001] The present invention belongs to the technical field of wind vibration control of electric power equipment, and in particular relates to a tuned mass vibration absorbing device for wind-induced vibration of a steel pipe tower member. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Ultra-high voltage AC (UHV) transmission line projects often utilize steel tubular towers. The slender, long poles in these towers are susceptible to light wind vibration. This continuous and repetitive vibration can cause fatigue failure at the pole end connections. In recent years, fatigue failure of the pole connection plates in steel tubular towers caused by light wind vibration has been reported in several UHV AC transmission line projects, posing a threat to the safe operation of the power grid.

[0004] The breeze vibration of steel tube tower poles is essentially the vortex-induced vibration of the circular tube. The current treatment measures are mainly to add supporting components or install spoilers on the steel tube tower poles. Adding supporting components changes the natural frequency of the poles and can fundamentally solve the breeze vibration problem, but the design and construction are relatively complicated; spoilers change the surface vortex of the poles and have a certain inhibitory effect on the vibration of steel tube tower poles, but the number of installations limits their inhibitory effect. Summary of the Invention

[0005] In order to solve at least one technical problem existing in the above-mentioned background technology, the present invention provides a tuned mass vibration absorption device for breeze vibration of steel tube tower members, which greatly reduces the vortex-induced vibration of steel tube tower members through high-impedance tuned vibration absorption measures.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A tuned mass vibration absorbing device for a steel pipe tower member vibrating in a breeze, comprising: Spring sheet (1), mass block (2), arc-shaped hoop (3) and annular hoop (4); The spring sheets (1) are evenly arranged along the circumferential direction of the steel pipe; a plurality of holes are provided on the spring sheets (1); The arc-shaped clamps (3) are evenly arranged along the circumferential direction of the steel pipe; two adjacent arc-shaped clamps (3) are fastened together by bolts passing through the middle of the corresponding spring sheets (1), and the middle of the spring sheets (1) is wrapped with a damping gasket (101); Both ends of each spring sheet (1) are also connected to the mass block (2) respectively; The annular hoop (4) is arranged at both ends of the spring sheet (1) and outside the steel pipe. The annular hoop (4) is evenly embedded in a plurality of metal plates (401) along the circumferential direction of the steel pipe, and the center of each metal plate (401) is aligned with the center of the corresponding mass block (2).

[0007] As an embodiment, the hole is located on a side of the spring sheet (1) close to the mass block (2).

[0008] As an embodiment, the length of the hole area on the spring sheet (1) is 1 / 3 of the length of the entire spring steel sheet.

[0009] As an embodiment, the porosity of the hole area does not exceed 50%.

[0010] As an embodiment, the mass block (2) is composed of a permanent magnet and a steel plate, and the magnetic pole direction of the permanent magnet is parallel to the width direction of the spring sheet (1).

[0011] As an embodiment, the number of the spring sheets (1) is four, two of which are placed vertically and the other two are placed horizontally; As an embodiment, the number of the arc-shaped clamps (3) is four, and they are evenly arranged along the circumference of the steel pipe; As an embodiment, the annular clamp (4) is evenly embedded in four metal plates (401) along the circumferential direction of the steel pipe.

[0012] As an embodiment, the size of the metal plate (401) on the annular hoop (4) is determined according to the maximum vibration displacement of the mass block (2).

[0013] As an embodiment, the gap between the metal plate (401) and the mass block (2) is determined according to the optimal tuning damping ratio.

[0014] As an implementation method, the process of determining the optimal tuning damping ratio is as follows: According to the ratio of the first-order modal mass of the mass block and the steel tube member , determine the optimal tuning ratio .

[0015] The beneficial effects of the present invention are: The present invention combines several spring sheets and a mass block into a spring-mass system. During the vibration of the mass block, the metal plate cuts the magnetic lines of force to generate magnetic damping, and the damping gasket wrapped around the spring plate generates viscous damping. The optimal tuning design can be achieved according to the vibration frequency of the steel pipe, greatly reducing the vortex-induced vibration of the steel pipe.

[0016] The two adjacent arc-shaped clamps of the present invention are fastened together by passing bolts through the middle of the corresponding spring sheets, and a damping gasket is wrapped around the middle of the spring sheet. The damping gasket can avoid direct friction between the spring plate and the arc-shaped clamp, thereby improving the fatigue life of the spring sheet.

[0017] The spring sheet of the present invention is provided with a plurality of holes, which can reduce the wind load and the pressure of the spring sheet, and reduce the vortex-induced vibration of the steel pipe tower member.

[0018] Advantages of additional aspects of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 2. It is a schematic structural diagram of a tuned mass vibration absorbing device for a steel pipe tower member vibrating in a breeze according to an embodiment of the present invention; Figure 2 2. This is a schematic diagram of the connection between the arc-shaped clamp and the steel pipe according to an embodiment of the present invention; Figure 3 2. This is a schematic diagram of the connection between an annular clamp and a steel pipe according to an embodiment of the present invention; FIG4 (a) shows the displacement amplification coefficient of the steel pipe corresponding to different frequency ratios of the mixed steel pipe under load according to an embodiment of the present invention; FIG4( b ) shows the displacement amplification coefficient of the mass block corresponding to different frequency ratios of the loaded hybrid steel pipe according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] In the present invention, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", "bottom", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are relational words determined only for the convenience of describing the structural relationships of the various parts or elements of the present invention, and do not specifically refer to any part or element in the present invention, and should not be understood as limiting the present invention.

[0025] In the present invention, terms such as "fixed connection," "connected," and "connection" should be interpreted broadly to mean a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediary. Relevant researchers or technicians in this field may determine the specific meanings of these terms in the present invention based on specific circumstances, and they should not be construed as limitations of the present invention.

[0026] like Figure 1-Figure 3 As shown, a tuned mass vibration absorbing device for a steel pipe tower member subjected to breeze vibration according to an embodiment of the present invention comprises: a spring sheet (1), a mass block (2), an arc-shaped clamp (3) and an annular clamp (4); The spring sheets (1) are evenly arranged along the circumferential direction of the steel pipe; a plurality of holes are provided on the spring sheets (1); The arc-shaped clamps (3) are evenly arranged along the circumferential direction of the steel pipe; two adjacent arc-shaped clamps (3) are fastened together by bolts passing through the middle of the corresponding spring sheets (1), and the middle of the spring sheets (1) is wrapped with a damping gasket (101); Both ends of each spring sheet (1) are also connected to the mass block (2) respectively; The annular hoop (4) is arranged at both ends of the spring sheet (1) and outside the steel pipe. The annular hoop (4) is evenly embedded in a plurality of metal plates (401) along the circumferential direction of the steel pipe, and the center of each metal plate (401) is aligned with the center of the corresponding mass block (2).

[0027] It should be noted that the spring sheet (1) can be a spring steel sheet, and its material can be specifically set according to actual conditions; the metal plate (401) can be a copper sheet or a plate made of other materials.

[0028] In this embodiment, the hole is located on the side of the spring sheet (1) close to the mass block (2). The length of the hole area on the spring sheet (1) is 1 / 3 of the length of the entire spring steel sheet. The hole ratio of the hole area does not exceed 50%. This can reduce the static wind pressure under the direct action of wind load.

[0029] In this embodiment, the mass block (2) is composed of a permanent magnet and a steel plate, and the magnetic pole direction of the permanent magnet is parallel to the width direction of the spring sheet (1). The spring sheet (1) and the mass block (2) at the end form a spring mass system. During the vibration of the mass block (2), the metal plate cuts the magnetic lines of force to generate magnetic damping, and the damping gasket (101) wrapped around the spring plate (1) generates viscous damping. According to the vibration frequency of the steel pipe, an optimal tuning design can be achieved, which greatly reduces the vortex-induced vibration of the steel pipe.

[0030] In this embodiment, the number of the spring sheets (1) is four, two of which are placed vertically and the other two are placed horizontally; the number of the arc-shaped clamps (3) is four, which are evenly arranged along the circumferential direction of the steel pipe; the annular clamps (4) are evenly embedded in four metal plates (401) along the circumferential direction of the steel pipe.

[0031] It is understood that in other embodiments, the number of spring sheets (1), arc-shaped clamps (3) and metal plates (401) can be specifically set according to actual conditions, such as 5, 6, etc., and those skilled in the art can set them specifically according to actual conditions.

[0032] In a specific implementation process, the size of the metal plate (401) on the annular hoop (4) is determined according to the maximum vibration displacement of the mass block (2). The gap between the metal plate (401) and the mass block (2) is determined according to the optimal tuning damping ratio.

[0033] In one or more embodiments, the optimal tuning damping is determined as follows: According to the ratio of the first-order modal mass of the mass block and the steel tube member , determine the optimal tuning ratio .For example, Usually 0.02~0.08.

[0034] Among them, the natural frequency of the mass block vibration is determined according to the first-order modal frequency f of the steel tube member , the natural frequency of the mass block To determine the thickness and length of the spring steel sheet.

[0035] In this embodiment, the vertically placed and horizontally placed spring steel sheets vibrate in two vertical directions respectively, which can control the vibration of the steel pipe under different wind directions.

[0036] The size of the metal plate (401) on the annular hoop (4) is determined according to the maximum vibration displacement of the mass block (2), the gap between the metal plate (401) and the mass block (2) is determined according to the optimal tuning damping, and the cross section of the spring sheet (1) has a large difference in bending stiffness in the two main axis directions, which can ensure that the gap between the metal plate (401) and the mass block (2) remains constant under wind load and during vibration.

[0037] In this embodiment, the design steps of the tuning damping ratio are as follows: According to the mass ratio , the optimal tuning damping ratio of the mass block vibration is determined to be , the damping coefficient required for a single mass block is , where m is the mass of a single mass block, and the actual damping ratio is not less than ; Based on Determine the magnetic induction intensity B of the permanent magnet at the metal plate (401), where is the shape coefficient of the metal plate (401), t is the thickness of the metal plate (401), is the electrical conductivity of the metal plate (401), S is the area of ​​the permanent magnet in the mass block; Finally, the gap between the metal plate (401) and the mass block (2) is determined by the magnetic induction intensity B.

[0038] The damping gasket (101) can avoid direct friction between the spring steel plate (1) and the arc-shaped clamp (3), thereby improving the fatigue life of the spring plate (1).

[0039] The materials used in the tuned mass vibration absorbing device of the present invention are all corrosion-resistant materials, which are suitable for the field environment of the steel pipe tower and do not require maintenance during use.

[0040] 4( a ) and 4 ( b ), which are schematic diagrams of the tuned vibration absorption effect of the steel pipe displacement and the mass block displacement position, it can be seen that the tuned mass vibration absorption device according to the embodiment of the present invention significantly reduces the vortex-induced vibration of the steel pipe.

[0041] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A tuned mass vibration absorbing device for a steel pipe tower member subjected to breeze vibration, characterized in that: include: Spring sheet (1), mass block (2), arc-shaped hoop (3) and annular hoop (4); The spring sheets (1) are evenly arranged along the circumferential direction of the steel pipe; a plurality of holes are provided on the spring sheets (1); The arc-shaped clamps (3) are evenly arranged along the circumferential direction of the steel pipe; two adjacent arc-shaped clamps (3) are fastened together by bolts passing through the middle of the corresponding spring sheets (1), and the middle of the spring sheets (1) is wrapped with a damping gasket (101); Both ends of each spring sheet (1) are also connected to the mass block (2) respectively; The annular hoop (4) is arranged at both ends of the spring sheet (1) and outside the steel pipe. The annular hoop (4) is evenly embedded in a plurality of metal plates (401) along the circumferential direction of the steel pipe, and the center of each metal plate (401) is aligned with the center of the corresponding mass block (2).

2. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The hole is located on a side of the spring sheet (1) close to the mass block (2).

3. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The length of the hole area on the spring sheet (1) is 1 / 3 of the length of the entire spring steel sheet.

4. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 3, characterized in that: The porosity of the hole area shall not exceed 50%.

5. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The mass block (2) is composed of a permanent magnet and a steel plate, and the magnetic pole direction of the permanent magnet is parallel to the width direction of the spring sheet (1).

6. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The number of the spring sheets (1) is four, two of which are placed vertically and the other two are placed horizontally.

7. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The number of the arc-shaped clamps (3) is four, and they are evenly arranged along the circumferential direction of the steel pipe.

8. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The annular hoop (4) is evenly embedded in four metal plates (401) along the circumferential direction of the steel pipe.

9. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The size of the metal plate (401) on the annular hoop (4) is determined according to the maximum vibration displacement of the mass block (2).

10. The tuned mass vibration absorbing device for steel pipe tower members subjected to breeze vibration according to claim 1, characterized in that: The gap between the metal plate (401) and the mass block (2) is determined according to the optimal tuning damping ratio; the optimal tuning damping ratio is determined by: according to the ratio of the first-order modal mass of the mass block and the steel tube member , determine the optimal tuning ratio .

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