Multi-dimensional lever type collaborative vibration reduction device and vibration reduction method for offshore wind turbine tower drum

Abstract

The invention discloses a multi-dimensional lever type collaborative vibration reduction device for an offshore wind turbine tower drum, which realizes efficient vibration reduction through a multi-dimensional structure collaborative design, is integrally mounted in the offshore wind turbine tower drum, and converts inertia force of an additional mass block into reverse vibration reduction force by utilizing a force arm amplification principle, so that vibration energy is efficiently absorbed and dissipated. The vibration damping device comprises an inhaul cable mechanism, a damping vibration damper mechanism, a lever mechanism, an additional mass block, an annular guide rail and a flange plate. When the tower drum is subjected to external excitation, a differential equation of corresponding vibration response is deduced by establishing a kinetic model of the tower drum and the mass block, and an optimization design scheme of optimal parameters is provided. Displacement amplification and energy dissipation can be achieved through the lever principle, the vibration amplitude of the tower drum is remarkably reduced, the stability of an offshore wind turbine system is improved, and the service life of the offshore wind turbine system is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind tower vibration reduction, and in particular to a multi-dimensional lever-type coordinated vibration reduction device and a vibration reduction method for an offshore wind turbine tower. Background Art

[0002] With the rapid development of the offshore wind power industry, wind turbines are evolving towards high power and deep sea operation. The height of their towers is constantly increasing, and the overall structure is becoming more flexible. This makes them susceptible to large vibration responses under the influence of multiple environmental loads such as wind, waves, and currents. Long-term vibration not only reduces the stability of equipment operation and power generation efficiency, but may also cause fatigue damage and shorten the service life of the structure. To suppress tower vibration, tuned mass dampers (TMDs), liquid dampers (TLDs), friction dampers, and other devices are currently commonly used in engineering projects. However, traditional vibration reduction devices are mostly single-degree-of-freedom tuning methods, which have problems such as high tuning accuracy requirements, vibration reduction efficiency being greatly affected by the excitation direction, and limited structural layout. They are difficult to adapt to the needs of multi-directional coupled vibration control of towers in complex marine environments.

[0003] Therefore, there is an urgent need to develop a new vibration reduction device with a reasonable structure, multi-dimensional response control, sensitive response and easy installation and maintenance, so as to improve the overall vibration resistance of the offshore wind turbine tower structure. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a multi-dimensional lever-type coordinated vibration reduction device and vibration reduction method for an offshore wind turbine tower to solve the problems raised in the background technology.

[0005] In response to the above-mentioned problems, the present invention proposes a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower, comprising a cable mechanism, a damping vibration absorber mechanism, a lever mechanism, an additional mass block, an annular guide rail, and a flange. The vibration reduction device is installed inside the tower, and the damping vibration absorber mechanism, the lever mechanism, and the additional mass block are each arranged in four groups, evenly distributed along the circumference of the tower. The cable mechanism and the lever mechanism are hingedly connected via a fulcrum, the damping vibration absorber mechanism is respectively connected to the tower and the lever mechanism via a hinge hole and a guide slider, the lever mechanism is connected to the annular guide rail and the damping vibration absorber mechanism via a guide slider, and the annular guide rail is rigidly fixed to the tower. The cable mechanism comprises a cable and a lever fulcrum block, the two ends of the cable are anchored to the ground and the top of the tower respectively, the lever fulcrum block is fixed to the upper part of the cable, and is provided with hinge holes around it, and is rotatably connected to the annular lever through a pin shaft; The damping shock absorber mechanism includes a viscous damper, a series spring, a parallel spring, a connecting plate and a guide slider. After the viscous damper and the series spring are connected in series, the two ends are hinged to the connecting plate and the tower respectively. The parallel spring is arranged in parallel on both sides of the series assembly. The bottom of the connecting plate is slidably matched with the annular guide rail through a guide groove. The guide slider is respectively connected to the connecting plate and the long arm end of the lever. The lever mechanism consists of two annular lever groups and an annular center block. Each annular lever group includes two parallel annular levers. The middle of the annular lever is rigidly connected to the center block by a steel wire, and the center block is threadedly fixed to the lever fulcrum block. The long arm end of the annular lever cooperates with the guide slider of the additional mass block, and the short arm end cooperates with the guide slider of the connecting plate to form a displacement amplification structure. The upper and lower ends of the additional mass block are respectively slidably matched with the long arm end of the lever and the guide rails of the lower flange through guide sliders; the flange includes upper and lower flanges and a short cable, the two ends of the short cable are respectively connected to the flange and the cable, and the lower flange is provided with a guide rail to match the additional mass block.

[0006] Preferably, the length ratio of the long arm to the short arm of the annular lever of the lever mechanism is 2:1 to 4:1, and the lever is made of high-strength aluminum alloy.

[0007] Preferably, the annular guide rail is made of high-strength stainless steel and the surface is galvanized for corrosion protection.

[0008] Preferably, the length of the cable is adjusted according to the tower height and a tension margin is reserved. The lever fulcrum block is made of fine steel, with a center hole diameter of 20 mm and a chrome-plated surface.

[0009] Preferably, the surfaces of all metal parts are sprayed with polyurethane anti-corrosion paint, and the chrome plating layer of the damper piston rod has a thickness of 20 μm.

[0010] Preferably, each set of damping shock absorbers is equipped with a spare spring and a damper.

[0011] In addition, the present invention also discloses a vibration reduction method for a multi-dimensional lever-type coordinated vibration reduction device of an offshore wind turbine tower, comprising the following steps: Step 1: Transmit and amplify the tower vibration displacement through the lever mechanism: When the offshore wind turbine tower is subjected to external excitation, the tower moves x 1. The vibration of the tower is transmitted to the lever mechanism through the damping shock absorber mechanism. The lever mechanism rotates around the lever fulcrum block on the cable inside the tower and transmits the vibration to the lever mechanism through two arms of unequal length. L 1 and L 2. Amplify the vibration displacement of the tower times, causing the additional mass block at the long arm end of the lever to be displaced and move horizontally on the lower flange; Step 2: Multi-dimensional synergy of the damping and vibration absorber mechanism: the damping and vibration absorber mechanism comprises four subsystems, which are arranged in four orthogonal directions on the horizontal plane; Step 3: Optimize parameters for amplification effect: Based on mass ratio and leverage ratio r , the calculation expression of the optimal parameters is: Optimal tuning ratio ; Optimal stiffness ratio ; Optimal damping ratio ; in, ; ; ; Based on this calculation, the components of the device are configured to achieve efficient dissipation of vibration energy.

[0012] Furthermore, in step one, the lever mechanism is composed of two groups of parallel annular lever groups, the short arm end is transmitted through the guide slider and the connecting plate, and the long arm end is connected to the guide slider of the additional mass block to form a multi-degree-of-freedom displacement amplification mechanism.

[0013] Furthermore, in the step 2, the bottom of the connecting plate of the damping shock absorber mechanism contacts the annular guide rail through the guide groove to achieve low-friction movement in the horizontal direction.

[0014] Furthermore, in step 3, the optimal damping ratio is calculated by determining the optimal tuning ratio through fixed point theory, and its expression is as follows: ; Based on the amplitude amplification factor M The maximum value condition, combined with the leverage ratio r and quality ratio μ , the optimal stiffness ratio can be obtained and optimal damping ratio .

[0015] The present invention has the following beneficial effects: 1. The multi-dimensional lever-type collaborative vibration reduction device of the present invention achieves efficient vibration reduction through multi-dimensional structural collaborative design. It is integrated and installed inside the offshore wind turbine tower. By utilizing the principle of lever arm amplification, the inertial force of the additional mass block is converted into a reverse vibration reduction force, thereby efficiently absorbing and dissipating vibration energy.

[0016] 2. Relying on precise dynamic modeling and optimized design of key parameters such as leverage ratio, optimal frequency ratio, and damping ratio, this device can significantly reduce tower vibration amplitude, improve the fatigue resistance and service life of offshore wind turbines, and simplify installation and maintenance processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the vibration reduction device of the present invention.

[0019] Figure 3 Schematic diagram of the cable mechanism of the present invention.

[0020] Figure 4 Schematic diagram of the damping shock absorber mechanism of the present invention.

[0021] Figure 5 Schematic diagram of the lever mechanism of the present invention.

[0022] Figure 6 It is a schematic diagram of the ring lever structure of the present invention.

[0023] Figure 7 Schematic diagram of the structure of the additional mass block of the present invention.

[0024] Figure 8 Schematic diagram of the annular guide rail structure of the present invention.

[0025] Figure 9 It is a schematic diagram of the flange structure of the present invention.

[0026] Figure 10 Schematic diagram of the dynamic model of the vibration reduction system of the present invention.

[0027] Figure 11 The graph is an amplitude-frequency response curve of the present invention and the traditional Den-type dynamic vibration absorber when they have the same additional mass and optimal parameters.

[0028] Among them: 1 fan; 2 vibration reduction device; 3 cable mechanism; 4 damping shock absorber mechanism; 5 lever mechanism; 6 additional mass block; 7 annular guide rail; 8 flange; 101 tower; 102 hinge hole; 301 cable; 302 lever fulcrum block; 303 pre-processed hole; 304 pin; 305 nut; 401 viscous damper; 402 series spring; 403 parallel spring; 404 connecting plate; 405 guide slider; 501 annular lever 1; 502 annular lever 2; 503 annular lever 3; 504 annular lever 4; 505 circular center block; 801 upper flange; 802 lower flange; 803 short cable. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings and examples: Reference Figures 1 to 9The structure shown in the figure, this embodiment provides a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower, which includes a cable mechanism 3, a damping vibration absorber mechanism 4, a lever mechanism 5, an additional mass block 6, an annular guide rail 7 and a flange 8; The vibration reduction device 2 is installed inside the wind turbine tower 101. The damping vibration absorber mechanism 4, the lever mechanism 5 and the additional mass block 6 are four groups, evenly distributed in four directions of the tower 101. The four directions are the same, and only one direction is described below. The cable mechanism 3 is connected to the lever mechanism 5 through a fulcrum and rotates with the lever. The damping shock absorber mechanism 4 is connected to the tower 101 and the lever mechanism 5 through the hinge hole 102 and the guide slider 405. The lever mechanism 5 is connected to the annular guide rail 7 and the damping shock absorber mechanism 4 through the guide slider 405. The annular guide rail 7 is rigidly connected to the tower 101 so that it is integrated with the tower 101. The cable mechanism 3 includes a cable and a lever fulcrum block provided on the cable 301. One end of the cable 301 is vertically anchored to the ground, and the other end is connected to the top of the tower 101. The lever fulcrum block 302 is fixed above the cable 301. The lever fulcrum block 302 has pre-machined holes in four directions. The lever fulcrum block 302 is rotatably engaged with the annular lever 501 through a pin 304 and a nut 305 to form a rotatable hinge structure. The damping shock absorber mechanism 4 includes four groups of viscous dampers 401, series springs 402, parallel springs 403, connecting plates 404 and guide sliders 405. One end of the viscous damper 401 is connected to the connecting plate 404 through a pre-machined hinge hole 102, and the other end is connected to the series spring 402. The other end of the series spring 402 is connected to the tower 101 through a pre-machined hinge hole 102. The parallel spring 403 is arranged in parallel with the series spring-damper, one end is connected to the hinge hole 102 on the tower wall, and the other end is connected to the corresponding hinge hole on the connecting plate 404. The bottom of the connecting plate 404 is connected to the slide rail on the annular guide rail 7 through a guide groove. The guide slider 405 is rotatably matched with the connecting plate 404 through a pin. At the same time, another guide slider 405 cooperates with the long arm end of the annular lever to form a transmission structure. The lever mechanism 5 includes a first annular lever group 501 and 503, a second annular lever group 502, 504 and an annular center block 505. The first annular lever group is sleeved in the ring of the second annular lever group. The two annular lever groups respectively include two parallel annular levers. A steel wire is rigidly connected in the middle of the circular ring of each annular lever to form it and the annular lever as a whole. The annular center block 505 is located at the midpoint of the steel wire. The front end of the annular center block 505 is fixed to the lever fulcrum block 302 on the cable mechanism 3 by a threaded portion through a hexagonal nut 305, and the rear end of the non-threaded portion cooperates with the hole of the lever fulcrum block 302. The long arm end of each annular lever cooperates with the additional mass block 6 through a guide slider 405, and the short arm end cooperates with the connecting plate 404 through another guide slider 405 to form a displacement amplification transmission mechanism; The additional mass block 6 has its upper end engaged with the long arm end of the annular lever through the guide slider 405, and its lower end engaged with the guide rail on the lower flange 802 through the guide groove, forming a bidirectional sliding constraint; The outer ring of the annular guide rail 7 is rigidly connected to the tower 101 so that it forms an integral part with the tower 101. The four sets of linear rails in the annular guide rail 7 respectively cooperate with the guide grooves at the bottom of the four connecting plates 404 through slide rails to form horizontal sliding pairs, constraining the connecting plates 404 to move only along the guide rail direction. The flange 8 includes an upper flange 801, a lower flange 802 and a short cable 803. One end of the short cable 803 evenly distributed in four directions is fixed on the upper and lower flanges 8, and the other end of the short cable 803 is fixed to the cable 301 of the cable mechanism 3. The guide rail is installed on the lower flange 802 to slide and cooperate with the additional mass block 6 for transmission.

[0030] Preferably, the ratio of the long arm to the short arm of the annular lever of the lever mechanism 5 is a key parameter for controlling the displacement magnification, wherein the ratio of the long arm to the short arm ranges from 2:1 to 4:1, and the annular lever is made of high-strength aluminum alloy material.

[0031] Preferably, the annular guide rail 7 is made of high-strength stainless steel and is galvanized on the surface.

[0032] Preferably, the total length of the cable 301 is determined according to the height of the tower 101, and a tension adjustment margin is reserved. The lever fulcrum block 302 of the cable 301 is made of fine steel, with a center hole diameter of 20 mm and a chrome-plated surface for corrosion protection.

[0033] Preferably, the surfaces of all metal parts are sprayed with polyurethane anti-corrosion paint, and the piston rod of the damper 401 is chrome-plated with a coating thickness of 20 μm.

[0034] Preferably, each set of damping shock absorbers is equipped with a spare spring and damper.

[0035] In addition, the present invention also discloses a vibration reduction method for a multi-dimensional lever-type coordinated vibration reduction device of an offshore wind turbine tower, comprising the following steps: Step 1: Transmit and amplify the vibration displacement of the tower 101 through the lever mechanism 5: When the offshore wind turbine tower 101 is subjected to external excitation, such as wind load, wave action, vortex-induced vibration, etc., the tower 101 is displaced by x1, and the vibration of the tower 101 is transmitted to the lever mechanism 5 through the damping absorber mechanism 4. The lever mechanism 5 rotates around the lever fulcrum block 302 on the cable 301 inside the tower 101 and amplifies the vibration displacement of the tower 101 through two unequal length arms L1 and L2 times, causing the additional mass block 6 at the long arm end of the annular lever to be displaced and move horizontally on the lower flange 802.

[0036] Step 2: Multi-dimensional synergy of the damping and vibration absorber mechanism 4: The damping and vibration absorber mechanism 4 includes four subsystems, which are respectively arranged in four orthogonal directions on the horizontal plane.

[0037] Step 3: Optimize parameters for amplification effect: Based on mass ratio and leverage ratio r, the optimal parameter calculation expression is: Optimal tuning ratio ; Optimal stiffness ratio ; Optimal damping ratio ; in, ; ; ; Based on this calculation, the components of the device are configured to achieve efficient dissipation of vibration energy.

[0038] Furthermore, in step one, the lever mechanism 5 is composed of two groups of parallel annular lever groups, the short arm end of each group of annular levers forms a transmission match with the connecting plate 404 through the guide slider 405, and the long arm end is transmission-connected with the guide slider 405 of the additional mass block 6, forming a multi-degree-of-freedom displacement amplification mechanism.

[0039] Furthermore, in the step 2, the bottom of the connecting plate 404 of each subsystem of the damping shock absorber mechanism 4 contacts the annular guide rail 7 through the guide groove, ensuring low-friction movement in the horizontal direction.

[0040] Furthermore, in step 3, the calculation of the optimal damping ratio further includes: The optimal tuning ratio is determined by fixed point theory, and its expression is: ; Based on the maximum value condition of the amplitude amplification factor M, combined with the lever ratio r and mass ratio μ, the optimal stiffness ratio can be obtained: and optimal damping ratio .

[0041] Example 1 Assume that the mass of the tower is m1, the stiffness is k1, and the displacement is x1. The mass of the additional mass block is m2, the damping of the viscous damper is c, the stiffness of the parallel spring is k2, the stiffness of the series spring is k3, the lengths of the short arm end and the long arm end of the lever are L1 and L2 respectively, and the lever magnification ratio is .but Figure 10 The differential equation of the vibration system model is:

[0042] Consider the above as the imaginary part of a matrix complex exponential function differential equation and let the particular solution of the equation be: ; ; ; Thus obtaining Expressed in real amplitude form, the tower amplitude amplification factor M can be obtained: in, is the mass ratio; is the natural frequency ratio; is the normalized frequency ratio; is the natural frequency of the main system; is the natural frequency of the vibration absorber; is the damping ratio; is the stiffness ratio.

[0043] From the fixed point theory we get

[0044] The horizontal coordinates of the three fixed points Q, S and T are obtained from the formula

[0045]

[0046]

[0047] Adjust the vertical coordinates of Q, S and T points to the same height to obtain the optimal frequency ratio

[0048] The optimal stiffness ratio can be further obtained

[0049] When the above parameters are at their optimal values, the vertical coordinates of the three fixed points Q, S and T are ; In order to achieve the best vibration effect, according to the extreme value condition, the three fixed points are adjusted to the highest point, and the maximum value point λ of the amplification factor M satisfies

[0050] Select the Q point abscissa formula and substitute it to get the optimal damping ratio

[0051] in, ; ; ; Example 2: The present invention is compared with the traditional Den type dynamic vibration absorber, such as Figure 11 As shown, when the present invention and the traditional Den dynamic vibration absorber have the same additional mass and take the optimal parameters, the dynamic vibration absorber of the present invention has better vibration reduction performance and can effectively suppress the tower amplitude.

[0052] Table 1 Main system parameters

[0053] Table 2 Parameters of traditional Den-type dynamic vibration absorber

[0054] Table 3 Parameters of the dynamic vibration absorber of the present invention (r=2.5)

[0055] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower, characterized in that: It comprises a cable mechanism (3), a damping vibration absorber mechanism (4), a lever mechanism (5), an additional mass block (6), an annular guide rail (7) and a flange (8); the vibration damping device is installed inside the tower (101), and the damping vibration absorber mechanism (4), the lever mechanism (5) and the additional mass block (6) are four groups, which are evenly distributed along the circumference of the tower (101); the cable mechanism (3) and the lever mechanism (5) are hinged through a fulcrum, the damping vibration absorber mechanism (4) is connected to the tower (101) and the lever mechanism (5) through a hinge hole (102) and a guide slider (405), respectively, the lever mechanism (5) is connected to the annular guide rail (7) and the damping vibration absorber mechanism (4) through the guide slider (405), and the annular guide rail (7) is rigidly fixed to the tower (101); The cable mechanism (3) comprises a cable (301) and a lever fulcrum block (302), wherein both ends of the cable (301) are anchored to the ground and the top of the tower (101) respectively, and the lever fulcrum block (302) is fixed to the upper part of the cable (301), and is provided with hinge holes (303) around it, and is rotatably connected to the annular lever through a pin shaft (304); The damping shock absorber mechanism (4) includes a viscous damper (401), a series spring (402), a parallel spring (403), a connecting plate (404) and a guide slider (405). After the viscous damper (401) and the series spring (402) are connected in series, the two ends are respectively hinged to the connecting plate (404) and the tower (101). The parallel spring (403) is arranged in parallel on both sides of the series assembly. The bottom of the connecting plate (404) is slidably matched with the annular guide rail (7) through a guide groove. The guide slider (405) is respectively connected to the connecting plate (404) and the long arm end of the lever. The lever mechanism (5) is composed of a first lever group, a second lever group and an annular center block (505), each annular lever group includes two parallel annular levers, the middle of the annular lever is rigidly connected to the center block (505) via a steel wire, and the center block (505) is screw-fixed to the lever fulcrum block (302); the long arm end of the annular lever cooperates with the guide slider (405) of the additional mass block (6), and the short arm end cooperates with the guide slider (405) of the connecting plate (404), forming a displacement amplification structure; The upper and lower ends of the additional mass block (6) are respectively slidably matched with the long arm end of the lever and the guide rails of the lower flange (802) through the guide slider (405); the flange (8) includes an upper flange (801), a lower flange (802) and a short cable (803), and the two ends of the short cable (803) are respectively connected to the flange (8) and the cable (301), and the lower flange (802) is provided with a guide rail to match the additional mass block (6).

2. The multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 1, characterized in that: The lever mechanism (5) has a ring lever with a long arm and a short arm length ratio of 2:1 to 4:1, and is made of high-strength aluminum alloy.

3. The multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 1, characterized in that: The annular guide rail (7) is made of high-strength stainless steel and has a galvanized surface for corrosion resistance.

4. The multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 1, characterized in that: The length of the cable (301) is adjusted according to the height of the tower (101) and a tension margin is reserved. The lever fulcrum block (302) is made of fine steel, has a center hole diameter of 20 mm, and is chrome-plated on the surface.

5. The multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 1, characterized in that: All metal parts are sprayed with polyurethane anti-corrosion paint, and the chrome plating thickness of the damper (401) piston rod is 20 μm.

6. The multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 1, characterized in that: Each set of damping shock absorbers is equipped with a spare spring and a damper (401).

7. A vibration reduction method for a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Transmit and amplify the tower vibration displacement through the lever mechanism: When the offshore wind turbine tower is subjected to external excitation, the tower moves x 1. The vibration of the tower is transmitted to the lever mechanism through the damping shock absorber mechanism. The lever mechanism rotates around the lever fulcrum block on the cable inside the tower and transmits the vibration to the lever mechanism through two arms of unequal length. L 1 and L 2. Amplify the vibration displacement of the tower times, causing the additional mass block at the long arm end of the lever to be displaced and move horizontally on the lower flange; Step 2: Multi-dimensional synergy of the damping and vibration absorber mechanism: the damping and vibration absorber mechanism comprises four subsystems, which are arranged in four orthogonal directions on the horizontal plane; Step 3: Optimize parameters for amplification effect: Based on mass ratio and leverage ratio r , the calculation expression of the optimal parameters is: Optimal tuning ratio ; Optimal stiffness ratio ; Optimal damping ratio ; in, ; ; ； Based on this calculation, the components of the device are configured to achieve efficient dissipation of vibration energy.

8. The vibration reduction method of a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 7, characterized in that: In step 1, the lever mechanism (5) is composed of two groups of parallel annular lever groups, the short arm end is driven by the guide slider (405) and the connecting plate (404), and the long arm end is connected to the guide slider (405) of the additional mass block (6), forming a multi-degree-of-freedom displacement amplification mechanism.

9. The vibration reduction method of a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 7, characterized in that: In the second step, the bottom of the connecting plate (404) of the damping shock absorber mechanism (4) contacts the annular guide rail (7) through the guide groove, thereby achieving low-friction movement in the horizontal direction.

10. The vibration reduction method of a multi-dimensional lever-type coordinated vibration reduction device for an offshore wind turbine tower according to claim 7, characterized in that: In step 3, the optimal damping ratio is calculated by determining the optimal tuning ratio through fixed point theory, and its expression is as follows: ； Based on the amplitude amplification factor M The maximum value condition, combined with the leverage ratio r and quality ratio μ , the optimal stiffness ratio can be obtained and optimal damping ratio .

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