A flexible constrained-particle damper vibration absorber

Abstract

The application discloses a flexible constraint particle damping vibration isolation hammer, which comprises a wire clamp, a steel strand, two hammer heads and multiple partitions, the middle part of the steel strand is connected with the wire clamp, the two hammer heads are arranged at the two ends of the steel strand respectively, the hammer head is a hollow pipe body structure, the two ends of the hammer head are respectively provided with a hammer head end cover, the end part of the steel strand is connected with the hammer head end cover away from the wire clamp after penetrating through the inside of the hammer head, the multiple partitions are vertically fixed on the inner wall of the hammer head and are arranged around the hammer head, a sector cavity is divided between the adjacent two partitions and the inner wall of the hammer head, a group of flexible particle damping units are arranged in each sector cavity, and each group of the flexible particle damping units comprises multiple particles covered by a first flexible constraint material. The flexible constraint particle damping vibration isolation hammer replaces viscous damping with maximum friction damping, realizes low-frequency vibration suppression of the particle vibration isolation hammer on the power transmission line, does not need to be replaced and maintained regularly, and has the advantages of no grease and no pollution.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction and damping technology for power transmission lines, specifically a flexible constrained particle damping vibration damping hammer. Background Technology

[0002] With the advancement of my country's "West-to-East Power Transmission" project, high-voltage and ultra-high-voltage power transmission technologies have become a calling card for my country on the international stage. However, long-distance transmission lines erected at high altitudes are often subject to vibrations from light winds, and may even exhibit galloping behavior during severe weather conditions such as strong winds and heavy rain. These vibrations can accelerate the aging of hardware, jumpers, and insulators, leading to broken strands, short wires, and even damage to the foundation materials of transmission towers, loosening and falling bolts, ultimately causing serious power transmission accidents. Vibration dampers, as essential components installed on transmission lines, can limit the relative movement between split conductors (sub-conductors), protect the geometry of the conductors, and to a certain extent suppress vibrations from light winds, thus mitigating line galloping.

[0003] Traditional vibration dampers primarily use rubber materials for energy absorption and vibration reduction, resulting in a single energy dissipation method and limited effectiveness against larger vibrations. Prolonged outdoor sunlight accelerates rubber aging, making the products prone to corrosion and shortening their lifespan—far shorter than that of overhead transmission lines—significantly increasing the risk of power outages. Currently, newly developed damping fluid particles and variable damping composite vibration dampers offer improved vibration reduction; however, they struggle to suppress low-frequency vibrations (especially around 20Hz) in transmission lines. Furthermore, they suffer from complex structures, contain liquids within the enclosure, require complex manufacturing processes, demanding sealing requirements, are costly, and the potential for environmental pollution from the grease inside. Summary of the Invention

[0004] The purpose of this invention is to provide a flexible constrained particle damping vibration damper to solve the problem of low-frequency vibration suppression of power transmission lines in the prior art. At the same time, it can also solve the problem that the existing vibration damper has a complex structure and the grease contained inside can easily cause environmental pollution.

[0005] The technical solution of the present invention is: a flexible constrained particle damping vibration damping hammer, comprising a clamp, a steel strand, two hammer heads and multiple partitions. The middle part of the steel strand is connected to the clamp. The two hammer heads are respectively disposed at both ends of the steel strand. The hammer head is a hollow tube structure. Hammer head end caps are provided at both ends of the hammer head. The end of the steel strand passes through the inside of the hammer head and is connected to the hammer head end cap on the side away from the clamp. Multiple partitions are vertically fixed on the inner wall of the hammer head and arranged around the hammer head. The space between two adjacent partitions and the inner wall of the hammer head is divided into a fan-shaped cavity. Each fan-shaped cavity is provided with a set of flexible particle damping units. Each set of flexible particle damping units includes multiple particles covered by a first flexible constraint material.

[0006] Preferably, the first flexible restraint material is canvas tape, ABS plastic, or nylon.

[0007] Preferably, the multiple particles covered by the flexible constraint material in different groups of flexible particle damping units are of the same size.

[0008] Preferably, the multiple particles covered by the flexible constraint material in the same group of flexible particle damping units have the same size, while the multiple particles covered by the flexible constraint material in different groups of flexible particle damping units have different sizes.

[0009] Preferably, the sizes of the multiple particles covered by the flexible constraint material in different groups of flexible particle damping units are all different.

[0010] Preferably, the plurality of partitions are evenly distributed around the hammer head.

[0011] Preferably, each sector-shaped cavity contains multiple sets of flexible particle damping units, and the size of the multiple particles covered by the flexible constraint material of each set of flexible particle damping units is different.

[0012] Preferably, the multiple sets of flexible particle damping units are collectively covered by a second flexible constraint material, the material of which is the same as that of the first flexible constraint material.

[0013] Preferably, the hammer head end cap is connected to the end of the hammer head by a screw seal.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention significantly increases the contact time between the impactor and the main system through the flexible constraint boundary. Under the condition of constant momentum, the impact force caused by the flexible constraint is greatly reduced, and the flexible boundary enhances the collision and friction between particles. It replaces viscous damping with maximized frictional damping, making full use of the frictional damping of particles and consuming more energy. This solves the problems of unsatisfactory vibration reduction effect and difficulty in low-frequency vibration reduction of existing damping liquid particle vibration dampers and variable damping composite particle vibration dampers. It provides a new solution and technical approach for vibration control of power transmission lines or other vibration reduction and noise reduction.

[0016] 2. The present invention further employs methods such as single-pole and multi-level flexible constraints and gradient particle design to achieve low-bandwidth vibration suppression of transmission lines by particle anti-vibration hammers.

[0017] 3. Compared with existing damping fluid particle vibration dampers and variable damping composite particle vibration dampers, the present invention does not require regular replacement and maintenance, and has the advantages of being grease-free and pollution-free. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0020] Figure 3 This is a schematic diagram of the first optimized arrangement of the flexible particle damping unit inside the hammerhead of the present invention.

[0021] Figure 4 This is a schematic diagram of a second optimized arrangement of the flexible particle damping unit inside the hammerhead of the present invention;

[0022] Figure 5 This is a schematic diagram of the third optimized arrangement of the flexible particle damping unit inside the hammerhead of the present invention.

[0023] Figure 6 This is a schematic diagram of the experimental results of the present invention on the suppression of transmission line vibration. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1 to 6 The specific embodiments of the present invention will be described in detail below. In the description of the invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0026] Example 1

[0027] like Figures 1 to 2As shown, this embodiment of the invention provides a flexible constrained particle damping vibration damping hammer, including a clamp 1, a steel strand 2, two hammer heads 3, and multiple partitions 9. The middle part of the steel strand 2 is connected to the clamp 1. The two hammer heads 3 are respectively disposed at both ends of the steel strand 2. The hammer head 3 is a hollow tube structure. Hammer head end caps 5 are respectively provided at both ends of the hammer head 3. The end of the steel strand 2 passes through the interior of the hammer head 3 and is connected to the hammer head end cap 5 on the side away from the clamp 1. Multiple partitions 9 are vertically fixed on the inner wall of the hammer head 3 and are arranged around the hammer head 3. The space between two adjacent partitions 9 and the inner wall of the hammer head 3 is divided into a fan-shaped cavity 8. Each fan-shaped cavity 8 is provided with a set of flexible particle damping units. Each set of flexible particle damping units includes multiple particles 6 covered by a first flexible constraining material 7.

[0028] The cross-section of the hammer head can be set to a circle, ellipse, polygon, arc, etc., as required. This invention does not limit the shape of the hammer head, and the specific embodiments are described using a circle as an example.

[0029] In this invention, the degree of flexible constraint of the first flexible constraint material 7 is described by tightness, which is between 0.5 and 0.8 and can be designed according to the actual vibration suppression performance requirements.

[0030] This invention significantly increases the contact time between the impactor and the main system through the soft boundary of the first flexible constraint material 7. Under the condition of constant momentum, the impact force caused by the first flexible constraint material 7 is greatly reduced, and the flexible boundary intensifies the collision and friction between particles, thereby consuming more energy. Moreover, it has low noise during operation and is not sensitive to changes in the gap. This solves the problems of unsatisfactory vibration reduction effect and difficulty in low-frequency vibration reduction of existing damping fluid particle vibration dampers and variable damping composite particle vibration dampers. It provides a new solution and technical approach for vibration control of power transmission lines or other vibration reduction and noise reduction. At the same time, since no damping fluid is required, there is no need for regular replacement and maintenance, and it has the advantages of being grease-free and pollution-free.

[0031] Example 2

[0032] Based on Example 1, this embodiment is an optional specific implementation of the flexible restraint material 7. In this embodiment, canvas strip, ABS plastic or nylon is used as the flexible restraint material 7 to cover multiple particles 6.

[0033] like Figure 2 As shown, in the basic embodiment of the present invention, the multiple particles 6 covered by the flexible constraint material 7 in different groups of flexible particle damping units are the same size, and multiple partitions 9 are evenly distributed around the hammer head 3, forming a fan-shaped cavity 8 that is equally divided.

[0034] Furthermore, as a preferred embodiment capable of broadening the low-bandwidth vibration suppression effect of the vibration damper, such as...Figure 3 As shown, the multiple particles 6 covered by the flexible constraint material 7 in the same group of flexible particle damping units are the same size, while the multiple particles 6 covered by the flexible constraint material 7 in different groups of flexible particle damping units are all different sizes. At the same time, multiple partitions 9 are evenly distributed around the hammer head 3, forming an equally divided fan-shaped cavity 8. Figure 3 In the diagram, 6-1, 6-2, 6-3 and 6-4 represent different sizes of particles 6, representing particles of different gradients. The diameter of the particles in the flexible particle damping vibration damping hammer of this invention is 2mm-10mm, which can be designed according to the actual vibration suppression performance requirements.

[0035] Furthermore, as a preferred embodiment capable of broadening the low-bandwidth vibration suppression effect of the vibration damper, such as... Figure 4 As shown, the sizes of the multiple particles 6 covered by the flexible constraint material 7 in different groups of flexible particle damping units are all different. At the same time, multiple partitions 9 are evenly distributed around the hammer head 3, forming a fan-shaped cavity 8 that is equally divided.

[0036] Furthermore, as a preferred embodiment capable of broadening the low-bandwidth vibration suppression effect of the vibration damper, such as... Figure 5 As shown, each sector cavity 8 contains multiple sets of flexible particle damping units, and the size of the multiple particles 6 covered by the flexible constraint material 7 of each set of flexible particle damping units is different.

[0037] Furthermore, such as Figure 5 As shown, multiple sets of flexible particle damping units are covered by a second flexible constraint material 7-1. The material of the second flexible constraint material 7-1 is the same as that of the first flexible constraint material 7. This arrangement can achieve multi-level flexible constraint and enhance the suppression effect.

[0038] Specifically, such as Figure 1 As shown, the hammer head end cap 5 and the end of the hammer head 3 are sealed together by screws 4.

[0039] The present invention will now be described and illustrated with specific embodiments, referring to... Figure 2 It should be noted that, in this embodiment, the experiment uses four partitions 9 to divide the space into four sector-shaped cavities 8, and each sector-shaped cavity 8 contains a set of flexible constrained particle damping units.

[0040] Before use, the wire clamp 2 is connected to the steel strand 1. Then, multiple partition plates 8 are used to divide the interior of the hammer head 3 into several fan-shaped cavity structures. Then, multiple particles 7 are placed inside the first flexible constraint material 7. The process of covering multiple particles 7 is achieved by sewing the first flexible constraint material 7, such as canvas tape, together. The prepared flexible constraint particle damping unit is then built into each cavity. Then, the two ends of the hammer head 3 are sealed to the hammer head end cap 5 with screws 4. Finally, the two ends of the steel strand 1 are connected to the hammer head end cap 5 on the hammer head 3. The diameter of the particles in the flexible particle damping vibration damping hammer, the proportion of the particles to the cavity, and the tightness of the flexible constraint material can be designed according to the actual vibration suppression requirements.

[0041] During operation, the contact time between the impactor and the main system is greatly increased due to the soft boundary of the flexible bag through multiple particles. Under the condition of constant momentum, the impact force caused by the flexible bag is greatly reduced, and the flexible boundary intensifies the collision and friction between particles, thus consuming more energy. Moreover, it has low noise during operation and is not sensitive to changes in the gap.

[0042] The vibration suppression effect of the flexible particle damping vibration damper of this invention on power transmission lines has been verified in the laboratory, and the results are as follows: Figure 6 As shown.

[0043] 1) Compared with no vibration damper, the designed flexible particle damping vibration damper has a significant effect on vibration control of transmission lines near the main frequency point (32Hz), and the displacement power spectrum value of the transmission line is reduced by about 10 times.

[0044] 2) Compared with traditional vibration dampers, flexible particle damping vibration dampers reduce the displacement power spectrum of transmission lines by about 3 times.

[0045] This invention has a good vibration reduction effect at vibration frequencies such as 15Hz, 23Hz, and 32Hz, and has broadband vibration suppression characteristics.

[0046] The above-disclosed embodiments are merely preferred embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A flexible constrained particle damping vibration damper, comprising a clamp (1) and a steel strand (2), wherein the middle portion of the steel strand (2) is connected to the clamp (1), characterized in that, Also includes: Two hammers (3) are respectively set at both ends of the steel strand (2). The hammers (3) are hollow tube structures. Hammer end caps (5) are provided at both ends of the hammers (3). The end of the steel strand (2) passes through the inside of the hammers (3) and is connected to the hammer end cap (5) on the side away from the wire clamp (1). Multiple partitions (9) are vertically fixed on the inner wall of the hammer head (3) and arranged around the hammer head (3). The inner wall of the hammer head (3) between two adjacent partitions (9) is divided into a fan-shaped cavity (8). Each fan-shaped cavity (8) is provided with a set of flexible particle damping units. Each set of flexible particle damping units includes multiple particles (6) covered by a first flexible constraint material (7). Each sector cavity (8) contains multiple sets of flexible particle damping units; The multiple sets of flexible particle damping units are covered by a second flexible constraint material (7-1), and the material of the second flexible constraint material (7-1) is the same as that of the first flexible constraint material (7).

2. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The first flexible restraint material (7) is a canvas strip, ABS plastic or nylon.

3. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The multiple particles (6) covered by the flexible constraint material (7) in different groups of flexible particle damping units have the same size.

4. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The size of the multiple particles (6) covered by the flexible constraint material (7) in the same group of flexible particle damping units is the same, while the size of the multiple particles (6) covered by the flexible constraint material (7) in different groups of flexible particle damping units is different.

5. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The sizes of the multiple particles (6) covered by the flexible constraint material (7) in different groups of flexible particle damping units are all different.

6. A flexible constrained particle damping vibration damper according to any one of claims 3-5, characterized in that, The multiple partitions (9) are evenly distributed around the hammer head (3).

7. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The size of the multiple particles (6) covered by the flexible constraint material (7) of each group of flexible particle damping units is different.

8. The flexible constrained particle damping vibration damper according to claim 1, characterized in that, The hammer head end cap (5) and the end of the hammer head (3) are sealed together by screws (4).

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