Adjustable damping linkage type bidirectional sliding tuned mass damper for power transmission tower

Abstract

The application discloses an adjustable damping linkage type bidirectional sliding tuned mass damper for a power transmission tower, and belongs to the technical field of wind vibration control of power transmission tower structures. The adjustable damping linkage type bidirectional sliding tuned mass damper comprises a track assembly, the track assembly comprises a plurality of groove-shaped tracks, the plurality of groove-shaped tracks enclose a closed rectangle on a horizontal plane, the inner side of the groove-shaped track is provided with an opening, a mass trolley is slidably connected in the opening, both ends of the mass trolley are respectively provided with springs, the mass trolley is internally provided with a cavity structure, a damping assembly is placed in the cavity structure, a connecting rod is installed on the side of the mass trolley close to the opening, the other end of the connecting rod away from the mass trolley is connected with another connecting rod, and the power transmission tower is located between the plurality of connecting rods. The adjustable damping linkage type bidirectional sliding tuned mass damper is installed on a platform formed by a cross partition surface of the power transmission tower, multi-directional vibration absorption is realized through a simple installation process, a plurality of mass trolleys are linked to amplify the mass participating in energy dissipation, and when one moves, all move, so that the damping efficiency and the wind vibration resistance are obviously improved.

Description

Technical Field

[0001] This invention belongs to the field of wind vibration control technology for transmission tower structures, and particularly relates to an adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers. Background Technology

[0002] Under long-term dynamic loads from strong winds, the problem of loosening of tower bolts is common in transmission towers. The cumulative fatigue damage caused by wind vibration can lead to the failure of connecting components, and in severe cases, tower collapse and line breakage accidents. In engineering, passive measures such as increasing the strength of components and adding diagonal bracing are mainly used to resist wind vibration. This not only significantly increases the amount of tower materials used and the cost of the foundation, but also cannot fundamentally suppress the vibration response.

[0003] The tower-conductor system itself possesses a complex "excitation-constraint" coupling mechanism: the conductor excites the tower body through inertial loads while providing lateral constraints through tension. This results in a significantly lower natural frequency than a single tower, with a particularly pronounced decrease in torsional frequency. Under strong winds, the maximum displacement of the tower-conductor system can reach 1.92 times that of a single tower, while the maximum axial force and stress are 1.6 times and 1.37 times, respectively, resulting in a more severe vibration response.

[0004] Traditional tuned mass dampers (TMDs) have inherent limitations in transmission tower engineering: their vibration reduction effect is highly dependent on the size of the mass trolley, and most research and devices only consider the wind load response in one direction, failing to meet the control requirements of transmission towers under bidirectional wind vibration. Although adjusting the mass ratio of the TMD to about 2% can achieve an acceleration reduction rate of 20%–27% and a displacement reduction rate of 10%–25%, these solutions are often difficult to achieve bidirectional adjustment within the confined space of the transmission tower, and lack durability design for strong wind environments. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides an adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers, comprising a track assembly, the track assembly comprising four grooved tracks, the four grooved tracks forming a closed rectangle on a horizontal plane, the inner side of the grooved tracks having an opening, a mass trolley slidably connected within the opening, the two ends of the mass trolley being connected to a spring via hooks, a damping component being provided inside the mass trolley, a connecting rod being installed at the end of the mass trolley away from the opening, and the other end of the connecting rod away from the mass trolley being connected to another connecting rod.

[0007] Optionally, the damping component is a steel ball, the mass carriage has a cavity inside and a through hole on the top surface of the mass carriage, the through hole is connected to the cavity, and is used to pick up and put in steel balls to adjust the collision frequency and friction intensity between steel balls and between steel balls and the container wall to adjust the damping.

[0008] Optionally, the opening is provided with a groove, and the mass trolley is adapted to the groove.

[0009] Optionally, the mass trolley has a first groove on the side near the connecting rod, and one end of the connecting rod is slidably connected in the first groove.

[0010] Optionally, the spring is connected to the inner walls of both ends of the hook and the grooved track, respectively.

[0011] Optionally, the connecting rod has a spherical head and a perforated interface at both ends. The spherical head is slidably connected in the first groove. The connecting rod has multiple second grooves. The perforated interface is slidably connected to the second groove adjacent to it.

[0012] Optionally, a partition is provided between two adjacent cavities, and the partition is fixed inside the mass trolley.

[0013] Optionally, the mass cart is equipped with four wheels at its bottom, the wheels being adapted to the groove.

[0014] This invention discloses the following technical effects: Four grooved tracks are respectively fixed to the four horizontal profiles of the transmission tower by clamps to form a closed rectangle, and the opening of each grooved track faces the center of the transverse diaphragm. The track has a long and thin groove, which allows the wheels of the mass trolley to slide in the middle. When the transmission tower vibrates under wind load in any direction, at least one mass trolley will move along the opening. This sliding is synchronously driven by the connecting rod to move the other three mass trolleys together. The mass trolley slides left and right in the middle part of the opening. Energy is dissipated through the relative motion between the trolley and the steel ball during structural vibration: the structural vibration first drives the trolley to move, transferring kinetic energy to the steel ball and completing the momentum exchange; after the steel ball gains kinetic energy, it undergoes violent collisions and friction in the sealed cavity, converting mechanical energy into heat energy and deformation energy through inelastic collisions; the steel ball rebounds randomly after the collision and continues to collide with the wall and adjacent steel balls, forming a persistent and continuous energy dissipation effect, thereby suppressing the dynamic response of the main structure. The optimal collision ratio can be found by adding or removing steel balls, ensuring both effective energy input and full internal dissipation, thus achieving optimal vibration reduction. This damper is not dependent on a specific frequency and has stronger robustness. The device utilizes the internal space of the transverse diaphragm to achieve multi-directional vibration absorption, and the linkage of multiple mass trolleys amplifies the mass involved in energy dissipation; "if one moves, all move," significantly improving damping efficiency and wind resistance. At the same time, the installation of the track components reinforces the transmission tower. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the linkage-type bidirectional sliding tuned mass damper for transmission towers according to the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a schematic diagram of the connection structure between the connecting rod and the mass cart of the present invention; Figure 4 This is a schematic diagram of the groove structure of the present invention; Figure 5 This is a schematic diagram of the connection structure between the mass cart and the spring in this invention; Figure 6 This is a schematic diagram of the structure of the mass cart of the present invention; Figure 7 This is a cross-sectional view of the mass cart of the present invention; Figure 8 This is a schematic diagram of the connecting structure of the linkage of the present invention; Figure 9 This is a schematic diagram of the connecting rod of the present invention.

[0016] Figure label: 1. Mass cart; 2. Spring; 3. Groove track; 4. Connecting rod; 5. Opening; 6. Groove; 7. First chute; 8. Cavity; 9. Through hole; 10. Hook; 11. Spherical head; 12. Perforated interface; 13. Second chute; 14. Partition; 15. Wheel. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Reference Figures 1 to 9As shown, this embodiment provides an adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers, including a track assembly. The track assembly includes four grooved tracks 3, which form a closed rectangle on a horizontal plane. The inner side of each grooved track 3 has an opening 5, and a mass trolley 1 is slidably connected within the opening 5. The two ends of the mass trolley 1 are connected to springs 2 via hooks 10. A damping component is provided inside the mass trolley 1. A connecting rod 4 is installed on the side of the mass trolley 1 near the opening 5, and the other end of the connecting rod 4 away from the mass trolley 1 is connected to another connecting rod 4. The outer edge dimension of the square formed by the four grooved tracks 3 is the same as the outer edge dimension of the transverse diaphragm at the intended installation position on the transmission tower body. The transverse diaphragm is fixedly connected to four horizontal members around the transverse diaphragm by clamps and bolts.

[0020] Four grooved tracks 3 are fixed to the four horizontal profiles of the transmission tower by clamps, forming a closed rectangle. The openings 5 ​​of each grooved track 3 face the center of the transverse diaphragm. The tracks have slender grooves 6, allowing the wheels 15 of the mass trolleys 1 to slide in the middle. When the transmission tower vibrates under wind load in any direction, at least one mass trolley 1 will move along the opening 5. This sliding is synchronously driven by the connecting rod 4 to move the other three mass trolleys 1 together. The mass trolleys 1 slide left and right in the middle of the opening 5, causing the internal steel balls to collide with the container wall and the steel balls. Through collision friction and rebound, continuous energy dissipation is achieved. This device utilizes the internal space of the transverse diaphragm to achieve multi-directional vibration absorption. The linkage of multiple mass trolley 1 components amplifies the mass involved in energy dissipation. "If one moves, all move," significantly improving damping efficiency and wind resistance. At the same time, the installation of the track components reinforces the transmission tower.

[0021] Further optimization of the scheme: the damping component is a steel ball, the mass carriage 1 has a cavity 8 inside and a through hole 9 on the top surface of the mass carriage 1. The through hole 9 is connected to the cavity 8 and is used to pick up and put in steel balls to adjust the collision frequency and friction intensity between steel balls and between steel balls and the container wall to adjust the damping.

[0022] The design was further optimized by adding a groove 6 inside the opening 5, which is adapted to the mass trolley 1.

[0023] The design was further optimized so that spring 2 was connected to hook 10 and the inner wall of opening 5 respectively.

[0024] The mass trolley 1 has a first groove 7 on the side near the connecting rod 4, and one end of the connecting rod 4 is slidably connected in the first groove 7.

[0025] Each mass cart 1 has a semi-cylindrical groove 6, i.e., the first slide groove 7, on its side, on which the spherical head 11 at one end of the connecting rod 4 can slide; the mass cart 1 has a cavity 8 inside for placing steel balls, and the mass and damping of the mass cart 1 can be adjusted by increasing or decreasing the number of steel balls; the mass cart 1 has wheels 15 at the bottom, which can slide on the groove 6; hooks 10 are provided on both sides of the mass cart 1, which can be used to suspend the spring 2.

[0026] Spring 2 combines elastic recovery and a small amount of energy dissipation. The track guide surface has a strip-shaped groove. When sliding, the mass cart 1 can slide left and right on the groove 6. When placed in the middle of the track, the mass cart 1 can slide left and right when there is vibration; subsequently, it compresses and stretches spring 2, converting the remaining kinetic energy into elastic potential energy. Spring 2 rebounds and releases energy, driving the mass cart 1 to accelerate in the opposite direction, thus reciprocating between the two ends of the track. The amplitude gradually decreases until the energy is exhausted and it stops. This design achieves a combination of passive damping and reciprocating motion characteristics through the energy storage and release mechanism of spring 2.

[0027] In a further optimized design, the connecting rod 4 has a spherical head 11 and a perforated interface 12 at both ends. The spherical head 11 is slidably connected in the first groove 7. The connecting rod 4 has multiple second grooves 13, and the perforated interface 12 is slidably connected to the adjacent second groove 13. The spherical end of the connecting rod 4 is connected to the semi-cylindrical groove 6 on the side of the mass cart 1, so that the four mass carts 1 form a linked whole.

[0028] The scheme is further optimized by providing a partition 14 between two adjacent cavities 8, and the partition 14 is fixedly connected to the mass trolley 1.

[0029] Further optimization of the design: wheels 15 are installed at the bottom of the mass vehicle 1, and the wheels 15 are adapted to the groove 6.

[0030] An installation method for an adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers includes the following steps: S1. Preparation and Baseline Positioning: At the transmission tower, confirm the surface flatness of the four horizontal profiles around the perimeter. After cleaning oil and rust from the material surfaces, use a laser level or a string line to mark the center plane of a closed rectangle on the four horizontal profiles, ensuring that the subsequently installed channel rails 3 are all within the same horizontal plane. Accurately mark the installation center line of each channel rail 3 and the fixing points of the clamps and bolts on the four horizontal profiles.

[0031] S2. Damping component pre-installation and track assembly: Damping components are first installed at both ends of each grooved track 3. Specifically, one end of the helical compression spring 2 is fixed to the end support of the grooved track 3. Then, the four grooved tracks 3 with pre-installed damping components are aligned with the installation center lines on the four horizontal profiles, with their openings 5 ​​all facing the center of the transverse partition. High-strength clamps are used to clamp and bolt the grooved tracks 3 to the horizontal profiles, forming a closed rectangular track frame. The flatness of the track joints is checked to ensure that the quality trolley 1 can smoothly pass through the joints.

[0032] S3. Insert and initially tune the mass carriages 1. According to the engineering calculations, insert the specified number of standard steel balls into the internal cavity 8 of the mass carriages 1 through the through hole 9, and weigh them to confirm that the masses of the four mass carriages 1 are consistent. Push the four mass carriages 1 into the four grooved tracks 3 respectively from the unclosed port or the reserved installation port. Manually push the mass carriages 1 to check their smoothness of sliding in the strip guide surface and observe whether they can smoothly compress the spring 2.

[0033] S4. The linkage mechanism is set up and coupled. Apply a suitable amount of grease to the first groove 7 of the four mass carriages 1. Connect the spherical heads 11 of the four flat connecting rods 4 to the corresponding first groove 7 on the side of the mass carriage 1. At the center of the transverse diaphragm, interlock the through slots of two opposing connecting rods 4 with the through slots of another pair of connecting rods 4. After aligning the slots, insert the central pin and lock the opening pin 5 or snap ring, so that the four connecting rods 4 form a cross-linking mechanism capable only of planar motion. Fine-tune the posture of each rod and check whether the entire linkage can drive the four mass carriages to move synchronously and smoothly without any jamming.

[0034] S5. Final inspection and rust prevention: Reconfirm that the tightening torque of all clamps, supports, and pins meets the design value. Apply rust-preventive coating or anti-loosening markings of the same grade as the tower material to the track joints, fasteners, and rod hinges. Observe the linkage response of the four mass trolleys 1 under simulated wind load or artificial hammering excitation. After confirming that "one movement affects all" and normal energy absorption, the installation is complete.

[0035] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "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 this invention, and are not intended to 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 this invention.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. An adjustable damping linkage type bidirectional sliding tuned mass damper for transmission towers, characterized in that: The system includes a track assembly comprising four grooved tracks (3) forming a closed rectangle on a horizontal plane. The grooved tracks (3) have an opening (5) on their inner side. A mass trolley (1) is slidably connected to the opening (5). The two ends of the mass trolley (1) are connected to a spring (2) via hooks (10). A damping assembly is provided inside the mass trolley (1). A connecting rod (4) is installed on the side of the mass trolley closest to the opening (5). The other end of the connecting rod (4) away from the mass trolley (1) is connected to another connecting rod (4).

2. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 1, characterized in that: The damping component is a steel ball. The mass cart (1) has a cavity (8) inside and a through hole (9) on the top surface of the mass cart (1). The through hole (9) is connected to the cavity (8) and is used to pick up and put down the steel ball to adjust the frequency of collisions and the intensity of friction between the steel balls and between the steel balls and the container wall to adjust the damping.

3. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 2, characterized in that: The opening (5) is provided with a groove (6), and the mass trolley (1) is adapted to the groove (6).

4. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 2, characterized in that: The mass trolley (1) has a first groove (7) on the side near the connecting rod (4), and one end of the connecting rod (4) is slidably connected in the first groove (7).

5. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 2, characterized in that: The spring (2) is connected to the inner walls of both ends of the hook (10) and the grooved track (3).

6. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 4, characterized in that: The connecting rod (4) is provided with a spherical head (11) and a perforated interface (12) at both ends. The spherical head (11) is slidably connected in the first groove (7). The connecting rod (4) is provided with a plurality of second grooves (13). The perforated interface (12) and the adjacent second groove (13) are slidably connected.

7. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 2, characterized in that: A partition (14) is provided between two adjacent cavities (8), and the partition (14) is fixed inside the mass trolley (1).

8. The adjustable damping linkage bidirectional sliding tuned mass damper for transmission towers according to claim 3, characterized in that: The bottom of the mass cart (1) is equipped with four wheels (15), which are adapted to the groove (6).

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