A pre-stranded power transmission line variable damping broadband vibration and noise reduction device and method

Abstract

The present application belongs to the technical field of power transmission line equipment, and provides a pre-stranded power transmission line variable damping wide-frequency vibration reduction and noise reduction device and method. The pre-stranded power transmission line variable damping wide-frequency vibration reduction and noise reduction device comprises a pre-stranded line clamp, a vertical cylinder, a horizontal arm and a damper; the pre-stranded line clamp is arranged on the power transmission line; the pre-stranded line clamp is connected with the vertical cylinder; the horizontal arms are symmetrically arranged on both sides of the vertical cylinder; two dampers are symmetrically arranged at the ends of each horizontal arm; the pre-stranded line clamp and the vertical cylinder are connected in communication for sending the incoming airflow to the vertical cylinder; the vertical cylinder, the horizontal arms on both sides thereof and the dampers are all provided with air spring flow chambers which are in communication with each other, so that the airflow flows in the air spring flow chambers in the vertical cylinder, the horizontal arms on both sides thereof and the dampers to achieve vibration reduction and noise reduction.

Description

Technical Field

[0001] This invention belongs to the technical field of power transmission line equipment, and particularly relates to a variable damping broadband vibration reduction and noise reduction device and method for pre-stretched power transmission lines. Background Technology

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

[0003] High-altitude power transmission lines are susceptible to mechanical vibration due to airflow. Vibrations caused by light winds are the most frequent and can lead to conductor fatigue fractures, potentially causing line breaks and threatening the operational lifespan of overhead transmission lines. Furthermore, with the ongoing construction of ultra-high-voltage AC / DC transmission lines, audible noise problems are becoming increasingly prominent, causing unease and annoyance to residents and workers near the lines, sometimes to the point of being unbearable, negatively impacting their daily lives and work.

[0004] To address the aforementioned problems, vibration dampers are typically used to suppress aerobatic vibrations in conductors and convert the vibrational energy into other forms of energy dissipation. The inventors have discovered that current vibration damper structures suffer from the following issues:

[0005] (1) Most of the existing vibration damping devices are passive vibration damping devices, which have limited ability to constrain the vibration of the conductor and cannot achieve automatic adjustment, lacking autonomy.

[0006] (2) Existing vibration damper devices have limited functionality and are also limited in reducing noise caused by power transmission lines. Summary of the Invention

[0007] In order to solve the technical problems existing in the background art, the present invention provides a pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device and method, which can avoid the vibration phenomenon of transmission lines in the wind and reduce the noise caused by transmission lines, so as to ensure the safe operation of transmission lines under long-term wind action.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] The first aspect of the present invention provides a variable damping broadband vibration reduction and noise reduction device for pre-stretched transmission lines.

[0010] A variable damping broadband vibration reduction and noise reduction device for pre-stretched transmission lines includes:

[0011] Pre-twisted wire clamps, vertical cylinders, horizontal arms, and vibration dampers;

[0012] The pre-twisted wire clamp is installed on the power transmission line; the pre-twisted wire clamp is connected to the vertical cylinder;

[0013] The horizontal arms are symmetrically arranged on both sides of the vertical cylinder;

[0014] Two anti-vibration hammers are symmetrically arranged at the end of each of the cross arms;

[0015] The pre-twisted clamp is connected to the vertical cylinder and is used to deliver the incoming airflow to the vertical cylinder;

[0016] The vertical cylinder, the horizontal arms on both sides, and the vibration damper are all equipped with air spring flow chambers, which are interconnected, so that airflow can circulate in the air spring flow chambers in the vertical cylinder, the horizontal arms on both sides, and the vibration damper to achieve vibration reduction and noise reduction.

[0017] In one embodiment, the pre-twisted wire clamp is connected to the vertical cylinder via the wire clamp rod.

[0018] In one embodiment, one end of the clamp rod is fixed to the pre-twisted clamp, and the other end extends into the vertical cylinder, allowing it to move linearly up and down within the vertical cylinder following the vibration of the conductor, while always remaining confined within the vertical cylinder.

[0019] In one embodiment, the pre-twisted clamp is elliptical in shape; a pre-twisted wire positioner is fixed outside the pre-twisted clamp to fix the pre-twisted wire; both the pre-twisted wire positioner and the pre-twisted wire can disrupt the Karman vortex street on the leeward side of the transmission line.

[0020] In one embodiment, the pre-twisted wire clamp includes a housing, a rubber pad, an air spring, a shaped rubber ring, a reserved cavity for the transmission line, pre-twisted wires, and a pre-twisted wire positioner;

[0021] The outer casing is rigidly connected to the wire clamp rod;

[0022] The pre-twisted wire positioner is uniformly welded onto the outer casing;

[0023] The pre-twisted wire passes through the pre-twisted wire positioner to achieve positioning;

[0024] The rubber pad is attached to the inner surface of the outer shell;

[0025] The irregularly shaped rubber ring has a cavity reserved for the transmission line, and the center of the online clamp is set there;

[0026] An air spring is filled between the rubber pad and the irregularly shaped rubber ring.

[0027] In one embodiment, a perforated rubber plate is provided inside the vertical cylinder. The perforated rubber plate is connected to the ball screw pair and the flywheel. The flywheel is placed inside the magnetorheological fluid tank. First coil windings are arranged on both sides of the magnetorheological fluid tank to form a magnetorheological fluid damping system.

[0028] In one implementation, an annular flow limiter is also provided inside the vertical cylinder, so that the cross-sectional area of ​​the vertical cylinder air spring flow chamber is larger than the cross-sectional area of ​​the horizontal arm air spring flow chamber, forming an air inertial capacitive damping system, while restricting the ball screw pair from always moving linearly up and down inside the vertical cylinder.

[0029] In one implementation, a steel strand coil and a battery are arranged inside the cross arm. The steel strand coil is wound around and attached to the outside of the rubber pad, and a piezoelectric ceramic unit is reserved in the rubber pad to form a steel strand friction energy dissipation-piezoelectric unit energy collection system. The piezoelectric ceramic unit is used to collect electrical energy and store it in the battery.

[0030] In one embodiment, the cross arm is made of a shape memory alloy;

[0031] In one implementation, the cross-sectional area of ​​the air spring flow chamber of the cross arm is larger than the cross-sectional area of ​​the air spring flow chamber of the vibration damper, forming an air inertial capacitive damping system.

[0032] In one embodiment, U-shaped magnets are respectively provided on both sides of the anti-vibration hammer in the width direction, and coil windings are arranged in the length direction. The magnetic field direction formed by the coil windings after being energized is consistent with the magnetic field direction formed by the U-shaped magnets. The U-shaped magnets are fixedly connected to the multiple Helmholtz resonant chambers.

[0033] In one embodiment, the multiple Helmholtz resonant chambers include sub-Helmholtz resonant chambers composed of several partitions. Each sub-Helmholtz resonant chamber is provided with a number of perforated plate resonant sound-absorbing structures, which are connected to the sub-Helmholtz resonant chambers by shape memory alloy springs.

[0034] In one implementation, the multiple Helmholtz resonant chambers include sub-Helmholtz resonant chambers, each with a different volume, and connected in parallel.

[0035] In one embodiment, the multiple Helmholtz resonant chambers include a sub-Helmholtz resonant chamber, which adopts an internal insertion neck design;

[0036] In one implementation, the multiple Helmholtz resonant chamber is connected to the air spring flow chamber of the vibration damper, so that the air in the multiple Helmholtz resonant chamber and the air in the vibration damper, horizontal arm and vertical cylinder can circulate through the air spring flow chamber.

[0037] A second aspect of the present invention provides a method for operating a pre-stretched transmission line variable damping broadband vibration reduction and noise reduction device.

[0038] A method for operating a pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described above, comprising:

[0039] Airflow enters the vertical cylinder through the pre-twisted wire clamp;

[0040] The airflow entering the vertical cylinder circulates within the air spring flow chambers of the vertical cylinder, the horizontal arms on both sides, and the vibration damper, thereby achieving vibration reduction and noise reduction.

[0041] The beneficial effects of this invention are:

[0042] (1) The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device of the present invention has the dual functions of vibration reduction and noise reduction, which can simultaneously solve the problem of suppressing the micro-wind vibration phenomenon of transmission lines and reducing the noise problem caused by transmission lines.

[0043] (2) The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device of the present invention adopts an elliptical-pre-stranded-air inertial capacitance-negative stiffness damping clamp, which can reduce the pressure on the transmission line during light wind vibration and can destroy the Karman vortex street on the leeward side of the transmission line. It amplifies the effective deformation of the energy dissipation device inside the inertial capacitance system and realizes high-efficiency vibration reduction and energy dissipation.

[0044] (3) The present invention designs multiple Helmholtz resonant chambers, each of which contains several parallel-connected sub-Helmholtz resonant chambers of different volumes, so that they generate resonance peaks at multiple frequencies or significantly increase the noise reduction at a certain resonance frequency, thereby enhancing the sound absorption performance of the resonant chamber structure at a specific resonance frequency and providing a wide-band attenuation, thus achieving noise reduction over a wide frequency band.

[0045] (4) The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device of the present invention has strong vibration reduction and noise reduction capabilities. The energy of the conductor or ground wire vibration is transmitted to the multiple Helmholtz resonant chambers and resonance occurs. The vibration energy of different frequencies transmitted is attenuated. Then the vibration energy is transmitted to the perforated plate resonant sound absorption structure inside the sub-Helmholtz resonant chamber and resonance occurs again, further attenuating the transmitted vibration energy and realizing vibration reduction and noise reduction. The cross-sectional area of ​​the vertical cylinder air spring flow chamber, the horizontal arm air spring flow chamber, and the anti-vibration hammer air spring flow chamber decreases in sequence, forming an inertial capacitance damping system. This amplifies the effective deformation of the energy dissipation device inside the inertial capacitance system and achieves high-efficiency vibration reduction and noise reduction.

[0046] (5) This invention makes extensive use of air springs. Therefore, the device includes air spring chambers with large volumes in the wire clamp, vertical cylinder, horizontal arm, and vibration damper, resulting in a lighter weight. The Helmholtz resonant chamber adopts an internal insertion neck design. Compared with an external insertion neck, this design allows for a thinner sound-absorbing structure while achieving the same acoustic characteristics, further reducing the weight of the device. In addition, the device has a simple structure, is easy to install and replace, and can effectively solve the problem of suppressing the micro-wind vibration of transmission lines and reducing the noise caused by transmission lines, demonstrating good economic efficiency and applicability.

[0047] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0048] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0049] Figure 1 This is an overall schematic diagram of the vibration reduction and noise reduction device according to an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the pre-twisted wire clamp according to an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of the crossarm steel strand friction energy dissipation-piezoelectric unit energy harvesting system according to an embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of the vibration damper (upper right) and its details according to an embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of the vibration damper (lower right) according to an embodiment of the present invention;

[0054] Figure 6 This is a schematic diagram of the vibration damper (lower left) according to an embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of the vibration damper (top left) according to an embodiment of the present invention.

[0056] Among them, 1. Ring track, 2. Irregularly shaped rubber ring, 3. Wire clamp rod, 4. Limiter, 5. Perforated rubber plate, 6. Magnetorheological fluid tank, 7. Reserved cavity for transmission line, 8. Pre-stirred wire clamp, 9. Rubber piston, 10. Ball nut, 11. Current limiter, 12. Piezoelectric ceramic unit, 13. Rubber pad, 14. Steel stranded coil, 15. Coil winding one, 16. Controller, 17. Flywheel, 18. Vibration damper, 19. Sub-Helmholtz resonant chamber, 20. Coil winding two, 21. Multiple Helmholtz resonant chamber, 22. U-shaped magnet, 23. Gas Pressure sensor, 24 anti-vibration hammer air spring flow chamber, 25 perforated rubber plate II, 26 cross arm air spring flow chamber, 27 battery, 28 perforated plate resonant sound absorption structure, 29 thin air layer, 30 metal sheet pores, 31 perforated metal sheet, 32 shape memory alloy spring, 33 inner channel, 34 vertical cylinder, 35 cross arm, 36 vertical cylinder air spring flow chamber, 37 air spring, 38 spiral rod, 39 partition plate, 40 pre-twisted wire, 41 pre-twisted wire positioner, 42 outer shell, 43 power transmission line. Detailed Implementation

[0057] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0058] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] according to Figure 1 , Figure 2 and Figure 3 The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device of this embodiment includes a pre-stranded clamp 8, a vertical cylinder 34, a horizontal arm 35 and a vibration damper 18.

[0061] The pre-twisted clamp 8 is installed on the transmission line 43; the pre-twisted clamp 8 is connected to the vertical cylinder 34; the horizontal arms 35 are symmetrically arranged on both sides of the vertical cylinder 34; each horizontal arm 35 has two anti-vibration hammers 18 symmetrically arranged at its end; the pre-twisted clamp 8 and the vertical cylinder 34 are connected to each other to deliver the incoming airflow to the vertical cylinder 34; the vertical cylinder 34 and the horizontal arms 35 and anti-vibration hammers 18 on both sides are provided with air spring flow chambers and are interconnected, so that the airflow flows in the air spring flow chambers in the vertical cylinder 34 and the horizontal arms 35 and anti-vibration hammers 18 on both sides to achieve vibration reduction and noise reduction.

[0062] In this embodiment, the pre-twisted wire clamp 8 is connected to the vertical cylinder 34 via the wire clamp rod 3.

[0063] In some embodiments, one end of the clamp rod 3 is fixed to the pre-twisted clamp 8, and the other end extends into the vertical cylinder 34, and can move vertically up and down in the vertical cylinder 34 following the vibration of the conductor, and is always confined within the vertical cylinder.

[0064] For example, one end of the wire clamp rod 3 that extends into the vertical cylinder 34 is fitted with a rubber piston 9, which is always restricted within the vertical cylinder 34 by the limiter 4.

[0065] It should be noted that in other embodiments, the structure of the wire clamp rod 3 can also be implemented using other structures, which will not be described in detail here.

[0066] In this embodiment, the pre-twisted wire clamp 8 includes a housing 42, a rubber pad 13, an air spring 37, a shaped rubber ring 2, a reserved transmission line cavity 7, pre-twisted wires 40, and a pre-twisted wire positioner 41;

[0067] The outer shell 42 is rigidly connected to the wire clamp rod; the pre-twisted wire positioner 41 is uniformly welded to the outer shell 42; the pre-twisted wire 40 passes through the pre-twisted wire positioner 41 to achieve positioning; the rubber pad is attached to the inner surface of the outer shell 42; the irregularly shaped rubber ring 2 has a reserved transmission line cavity 7 inside and is set at the center of the wire clamp; an air spring 37 is filled between the rubber pad 13 and the irregularly shaped rubber ring 2.

[0068] In this embodiment, the pre-twisted clamp 8 is elliptical in shape, and the elliptical cylindrical cross-section has a streamlined profile. Due to its shape advantage, it has a greater advantage in resisting fluid action. When airflow occurs, the maximum negative pressure is related to the axial length. The larger the ratio of the major axis to the minor axis, the smaller the maximum negative pressure, that is, the less pressure the cylinder bears. This indicates that the flatter the ellipse, the better it resists the fluid action. Specifically, the ratio of the major and minor axis lengths should be determined according to the actual situation. Furthermore, three pre-twisted wire positioners 41 are fixed externally to the pre-twisted wire 40 for fixing the pre-twisted wire 40. Both the pre-twisted wire positioners 41 and the pre-twisted wire 40 can disrupt the Karman vortex street on the leeward side of the transmission line 43.

[0069] The irregularly shaped rubber ring 2 is set inside the air spring 37, so that the air spring 37 is distributed in the ring channel 1 and the inner channel 33. When the conductor or ground wire vibrates up and down, the air in the ring channel 1 is squeezed into the inner channel 33, the air spring in the inner channel is compressed, and the irregularly shaped rubber ring 2 nearby applies pressure to the conductor or ground wire in the horizontal direction. At the same time, the cross-sectional area of ​​the ring channel 1 is controlled to be larger than the cross-sectional area of ​​the inner channel 33, forming an inertial capacitive negative stiffness damping system.

[0070] It should be noted that the shapes of the ring 1 and the inner channel 33 are determined by the shape of the irregular rubber ring. After the irregular rubber ring 2 is made, the ring 1 and the inner channel 33 are naturally formed. The ring 1 and the inner channel 33 are cavities, similar to pipes.

[0071] The vertical cylinder 34 is equipped with a perforated rubber plate 5, which is fixed to the inner wall of the vertical cylinder 34 and connected to the ball screw pair (10, 38) and flywheel 17 via a helical rod 38. The remaining cavities are filled with air springs. Here, "remaining cavities" refers to all areas other than the components already arranged in the vertical cylinder that are empty and filled with air.

[0072] In this embodiment, the flywheel 17 and the screw rod 38 are rigidly connected. When the air spring inside the vertical cylinder 34 is compressed, it pushes the ball screw pair (10, 38) to move up and down linearly inside the vertical cylinder 34, causing the screw rod 38 to rotate. At the same time, the screw rod 38 drives the flywheel 17 to rotate.

[0073] The flywheel 17 inside the vertical cylinder 34 is placed inside the magnetorheological fluid tank 6, and coil windings 15 are arranged on both sides of the magnetorheological fluid tank 6 to form a magnetorheological fluid damping system.

[0074] The vertical cylinder 34 is equipped with an annular flow limiter 11, which makes the cross-sectional area of ​​the vertical cylinder air spring flow chamber 36 larger than the cross-sectional area of ​​the horizontal arm air spring flow chamber 26, forming an air inertial capacitive damping system, while restricting the ball screw pair (10, 38) to always move linearly up and down inside the vertical cylinder 34.

[0075] In this embodiment, two coils of steel strands 14 are arranged inside the cross arm 35, respectively wound around and attached to the outside of two coils of rubber pads 13, and piezoelectric ceramic units 12 are reserved in the two coils of rubber pads 13 to form a steel strand friction energy dissipation-piezoelectric unit energy collection system.

[0076] Specifically, the material of the cross arm is a shape memory alloy.

[0077] It should be noted that in other embodiments, those skilled in the art can specifically set the cross arm to other shape memory materials according to the actual situation, which will not be described in detail here.

[0078] The cross-sectional area of ​​the air spring flow chamber 26 of the cross arm is larger than the cross-sectional area of ​​the air spring flow chamber 24 of the vibration damper, forming an air inertial capacitive damping system.

[0079] The vibration damper 18 has a U-shaped magnet 22 on each side, and a coil winding 20 is arranged along its length. The direction of the magnetic field formed by the coil winding 20 after it is energized should be consistent with the direction of the magnetic field formed by the two U-shaped magnets 22.

[0080] In this embodiment, the U-shaped magnet 22 and the multiple Helmholtz resonant chamber 21 are fixedly connected. The multiple Helmholtz resonant chamber 21 includes a sub-Helmholtz resonant chamber 19 composed of several partitions 39. Each sub-Helmholtz resonant chamber 19 is provided with a number of perforated plate resonant sound-absorbing structures 28. The perforated plate resonant sound-absorbing structures 28 are connected to the sub-Helmholtz resonant chamber 19 through shape memory alloy springs 32.

[0081] In this embodiment, the perforated plate resonant sound-absorbing structure 28 is a three-layer structure consisting of a perforated metal plate 31, a thin air layer 29, and a perforated metal plate 31.

[0082] It should be noted that in other embodiments, the perforated plate resonant sound-absorbing structure 28 can also be implemented by those skilled in the art using other existing technologies, which will not be elaborated here.

[0083] In a preferred embodiment, the multiple Helmholtz resonant chambers 21 are composed of several sub-Helmholtz resonant chambers 19, and the volume of each sub-Helmholtz resonant chamber 19 in each vibration damper 18 is different. They are connected in parallel to generate resonance peaks at multiple frequencies or significantly increase the noise reduction at a certain resonance frequency, thereby enhancing the sound absorption performance of the resonant cavity structure at a specific resonance frequency and providing a wideband attenuation, thus achieving noise reduction over a wideband.

[0084] In a preferred embodiment, the sub-Helmholtz resonant chamber 19 adopts an internal insertion neck design. Compared with an external insertion neck, while obtaining the same acoustic properties, the sound-absorbing structure can be thinned, reducing the weight of the device.

[0085] In this embodiment, the multiple Helmholtz resonant chamber 21 is connected to the anti-vibration hammer air spring flow chamber 24 through the perforated rubber plate 25, so that the air in the multiple Helmholtz resonant chamber 21 and the air in the anti-vibration hammer 18, the horizontal arm 35 and the vertical cylinder 34 can circulate through the air spring flow chamber (36,26,24).

[0086] In the specific implementation process, the electrical energy collected by the piezoelectric ceramic unit 12 is stored in the battery 27 in the cross arm 35. The battery 27 is connected to the controller 16 in the cross arm 35, the air pressure sensor 23 in the air spring flow chamber 26 of the cross arm, the magnetorheological fluid tank 6, and the coil windings (15, 20) near the anti-vibration hammer 18 to form a control circuit.

[0087] Reference Figures 1-3 The working principle of the pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device in this embodiment is as follows:

[0088] (1) First, the pre-twisted wire positioner 41 and the pre-twisted wire 40 can destroy the Karman vortex street on the leeward side of the transmission line 43; the vertical vibration of the conductor or ground wire causes the air in the loop 1 to be squeezed into the inner channel 33, and the air spring 37 in the inner channel 33 applies pressure to the conductor or ground wire in the horizontal direction, while controlling the cross-sectional area of ​​the loop 1 to be larger than the cross-sectional area of ​​the inner channel 33, forming an inertial-capacitive negative stiffness damping system, amplifying the effective deformation of the energy dissipation device inside the inertial-capacitive system, and achieving high-efficiency vibration reduction and energy dissipation.

[0089] Specifically, under the action of a light breeze, a Karman vortex street will form on the leeward side of the transmission line. The elliptical pre-twisted clamp 8 enhances the resistance to the fluid due to its shape advantage. The ratio of the major and minor axes can be determined according to the actual situation to reduce the negative pressure on the column. In addition, three pre-twisted wire positioners 41 are fixed on the outside of the pre-twisted clamp 8 to fix the pre-twisted wire 40. Both the pre-twisted wire positioners 41 and the pre-twisted wire 40 can destroy the Karman vortex street on the leeward side of the transmission line 43.

[0090] When a light wind vibrates the transmission line, the up-and-down vibration of the conductor or ground wire causes the irregular rubber ring 2 to deform. The air in the loop 1 is squeezed into the inner loop 33, and the air spring 37 in the inner loop 33 is compressed. The nearby rubber ring applies pressure to the conductor or ground wire in the horizontal direction. At the same time, the cross-sectional area of ​​the loop 1 is controlled to be larger than the cross-sectional area of ​​the inner loop 33, forming an inertial capacitive negative stiffness damping system, which amplifies the effective deformation of the energy dissipation device inside the inertial capacitive system.

[0091] (2) Secondly, the vibration of the conductor or ground wire causes the clamp rod 3 to move up and down in a straight line within the vertical cylinder 34. The air pushes the ball nut 10 to move up and down in a straight line along the spiral rod 38, causing the flywheel 17 to rotate. The magnetorheological fluid dampens the rotating flywheel 17, thus achieving energy dissipation through magnetorheological fluid damping. At the same time, the horizontal arm 35 is deformed by the torque of the anti-vibration hammer 18. The steel strand coil 14 located in the horizontal arm achieves frictional energy dissipation. The piezoelectric ceramic unit 12 senses the pressure and generates electrical energy, which is stored in the battery 27. This energy is used to energize the coil windings (15,20) to further reduce vibration and dissipate energy.

[0092] Specifically, the vertical vibration of the conductor or ground wire causes the clamp rod 3 to move linearly up and down inside the vertical cylinder 34. The rubber piston 9 of the clamp rod 3 compresses the air inside the vertical cylinder 34. The air passes through the perforated rubber plate 5 and pushes the ball nut 10 to move linearly up and down along the spiral rod 38, causing the spiral rod 38 and the flywheel 17 rigidly connected to the spiral rod 38 to rotate. The magnetorheological fluid dampens the rotating flywheel 17, realizing the energy dissipation of the magnetorheological fluid damping. At the same time, the horizontal arm 35 is forced to deform by the torque of the anti-vibration hammer 18. The steel strand coil 14 located in the horizontal arm realizes frictional energy dissipation and transmits the pressure to the piezoelectric ceramic unit 12 through the rubber pad 13. The piezoelectric ceramic unit 12 generates electrical energy and stores it in the battery 27 inside the horizontal arm 35, which powers the magnetorheological fluid tank 6 and the coil windings (15,20) near the anti-vibration hammer 18 to achieve further vibration reduction and energy dissipation.

[0093] (3) After that, the air in the vertical cylinder air spring flow chamber 36 is squeezed into the anti-vibration hammer air spring flow chamber 24 through the horizontal arm air spring flow chamber 26, and enters the multiple Helmholtz resonant chamber 21 through the perforated rubber plate 25. The vibration of the conductor or ground wire eventually causes the vibration of the anti-vibration hammer 18. The vibration energy is transferred to the multiple Helmholtz resonant chamber 21 and passes through multiple parallel sub-Helmholtz resonant chambers 19 of different volumes, which resonate and the vibration energy of different frequencies is attenuated. Then the vibration energy is transferred to the perforated plate resonant sound absorption structure 28 inside the sub-Helmholtz resonant chamber 19, which resonates again and further attenuates the transmitted vibration energy, thus achieving vibration reduction and noise reduction. The cross-sectional area of ​​the vertical cylinder air spring flow chamber 36-horizontal arm air spring flow chamber 26-anti-vibration hammer air spring flow chamber 24 decreases in sequence, forming an inertial-capacitive damping system, which amplifies the effective deformation of the energy-consuming device inside the inertial-capacitive system, thus achieving high-efficiency vibration reduction and noise reduction.

[0094] Because there is a phase difference in the vibration of the perforated plate resonant sound-absorbing structure 28 and the Helmholtz resonant chamber 19, the shape memory alloy spring 32 drives the perforated plate resonant sound-absorbing structure 28 to cut the magnetic field lines of the two U-shaped magnets 22, and the perforated metal plate 31 forms an eddy current. The eddy current generates heat and dissipates energy in the perforated metal plate 31.

[0095] (4) Finally, the amplitude of the vibration of the conductor or ground wire affects the air pressure in the air spring flow chamber (36,26,24). The air pressure sensor 23 in the air spring flow chamber 26 senses the change in air pressure and adjusts the current of the coil winding (15,20) near the magnetorheological fluid tank 6 and the anti-vibration hammer 18 through the controller 16 of the control circuit, thereby controlling the damping force of the magnetorheological fluid and the perforated metal plate in the anti-vibration hammer, thus realizing semi-active control. At the same time, the air spring and the shape memory alloy have a certain elastic restoring force, which enables the device to reset itself, thereby maintaining the continuous working state of the device.

[0096] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A variable damping broadband vibration reduction and noise reduction device for pre-stretched transmission lines, characterized in that, include: Pre-twisted wire clamps, vertical cylinders, horizontal arms, and vibration dampers; The pre-twisted wire clamp is installed on the power transmission line; the pre-twisted wire clamp is connected to the vertical cylinder; the pre-twisted wire clamp includes a shell, a rubber pad, an air spring, a shaped rubber ring, a reserved cavity for the power transmission line, pre-twisted wires, and a pre-twisted wire positioner; The outer casing is rigidly connected to the wire clamp rod; The pre-twisted wire positioner is uniformly welded onto the outer casing; The pre-twisted wire passes through the pre-twisted wire positioner to achieve positioning; The rubber pad is attached to the inner surface of the outer shell; The irregularly shaped rubber ring has a cavity reserved for the transmission line, and the center of the online clamp is set there; An air spring is filled between the rubber pad and the irregularly shaped rubber ring; The horizontal arms are symmetrically arranged on both sides of the vertical cylinder; Two anti-vibration hammers are symmetrically arranged at the end of each of the cross arms; The pre-twisted clamp is connected to the vertical cylinder and is used to deliver the incoming airflow to the vertical cylinder; The vertical cylinder, the horizontal arms on both sides, and the vibration damper are all equipped with air spring flow chambers, which are interconnected, so that airflow can circulate in the air spring flow chambers in the vertical cylinder, the horizontal arms on both sides, and the vibration damper to achieve vibration reduction and noise reduction.

2. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 1, characterized in that, The pre-twisted wire clamp is connected to the vertical cylinder via the wire clamp rod.

3. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 2, characterized in that, One end of the clamp rod is fixed to the pre-twisted clamp, and the other end extends into the vertical cylinder. It can move vertically up and down in the vertical cylinder following the vibration of the conductor, and is always confined within the vertical cylinder.

4. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 1, characterized in that, The pre-twisted wire clamp is elliptical in shape; a pre-twisted wire positioner is fixed outside the pre-twisted wire clamp to fix the pre-twisted wire; both the pre-twisted wire positioner and the pre-twisted wire can destroy the Karman vortex street on the leeward side of the transmission line.

5. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 1, characterized in that, The vertical cylinder is equipped with a perforated rubber plate, which is connected to the ball screw pair and the flywheel. The flywheel is placed in the magnetorheological fluid tank, and the first coil windings are arranged on both sides of the magnetorheological fluid tank to form a magnetorheological fluid damping system. or / and The vertical cylinder is also equipped with an annular flow limiter, which makes the cross-sectional area of ​​the vertical cylinder air spring flow chamber larger than that of the horizontal arm air spring flow chamber, forming an air inertial capacitive damping system, while restricting the ball screw pair from always moving up and down linearly within the vertical cylinder.

6. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 1, characterized in that, The cross arm contains a steel strand coil and a battery. The steel strand coil is wound around and attached to the outside of a rubber pad. A piezoelectric ceramic unit is reserved in the rubber pad to form a steel strand friction energy dissipation-piezoelectric unit energy collection system. The piezoelectric ceramic unit is used to collect electrical energy and store it in the battery. or The cross arm is made of shape memory alloy; or The cross-sectional area of ​​the air spring flow chamber of the cross arm is larger than that of the air spring flow chamber of the vibration damper, forming an air inertial capacitive damping system.

7. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 1, characterized in that, The vibration damper has U-shaped magnets on both sides of its width and coil windings arranged in its length. The magnetic field formed by the coil windings after being energized is in the same direction as the magnetic field formed by the U-shaped magnets. The U-shaped magnets are fixedly connected to the multiple Helmholtz resonant chambers.

8. The pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in claim 7, characterized in that, The multiple Helmholtz resonant chambers include sub-Helmholtz resonant chambers composed of several partitions. Each sub-Helmholtz resonant chamber is provided with a number of perforated plate resonant sound-absorbing structures. The perforated plate resonant sound-absorbing structures are connected to the sub-Helmholtz resonant chambers through shape memory alloy springs. or The multiple Helmholtz resonant chambers include sub-Helmholtz resonant chambers, each with a different volume, and are connected in parallel. or The multiple Helmholtz resonant chambers include sub-Helmholtz resonant chambers, and the sub-Helmholtz resonant chambers adopt an internal insertion neck design; or The multiple Helmholtz resonant chamber is connected to the air spring flow chamber of the vibration damper, allowing the air in the multiple Helmholtz resonant chamber to circulate with the air in the vibration damper, horizontal arm, and vertical cylinder through the air spring flow chamber.

9. A method for operating the pre-stranded transmission line variable damping broadband vibration reduction and noise reduction device as described in any one of claims 1-8, characterized in that, include: Airflow enters the vertical cylinder through the pre-twisted wire clamp; The airflow entering the vertical cylinder circulates within the air spring flow chambers of the vertical cylinder, the horizontal arms on both sides, and the vibration damper, thereby achieving vibration reduction and noise reduction.

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