Semi-active inerter nonlinear energy sink for wind turbine tower

Abstract

The application discloses a kind of semi-active inertial capacity non-linear energy trap of wind power tower, including mass spring system, inertial capacity system, eddy current damping system and support system, slide rail in mass spring system is horizontally fixed on the bottom plate of support system, the transmission gear of mass block in mass spring system and the first gear in inertial capacity system are engaged, inertia flywheel in inertial capacity system is connected with conductor cylinder in eddy current damping system by bolt, three transmission shafts in inertial capacity system are fixed on the bottom plate in support system by deep groove bearing and rolling bearing, the semi-active inertial capacity non-linear energy trap of wind power tower described above is used in the application, mass spring system, inertial capacity system, eddy current damping system and support system are distributed along vertical direction, it is convenient for the dissipation of heat energy generated when eddy current damping dissipates energy, avoid internal heat accumulation problem.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration control in wind power tower engineering structure, and particularly relates to a semi-active inertial non-linear energy sink for a wind power tower. BACKGROUND

[0002] During the service period, the land wind power tower inevitably faces the action of external wind load, and the offshore wind power tower also needs to face the influence of wave load, ice load and other external loads, and the vibration problem not only endangers the power generation efficiency of the wind turbine, but also causes structural safety problems. The nonlinear energy sink (NES) is an effective passive control technology for solving the vibration problem of high-rise structures. By installing NES in the structure, the problem of excessive structural response caused by external dynamic load can be solved.

[0003] The NES includes a mass block, a nonlinear spring element and a damping energy dissipation element. The mass block is connected to the controlled structure through the nonlinear spring and the damping energy dissipation element. When the controlled structure vibrates, the mass block moves back and forth according to the predetermined trajectory, repeatedly stretches and compresses the spring and the damping element, thereby achieving energy transfer and energy dissipation vibration reduction. Compared with the linear damper, the nonlinear energy sink has the characteristics of targeted energy transfer and unchanged natural frequency of the main structure, and can realize wide-frequency and high-efficiency vibration control.

[0004] The damping energy dissipation element of the commonly used NES is a viscous damper, including a piston, a shell and damping liquid. The mechanical energy of the controlled structure is converted into internal energy and dissipated by the reciprocating movement of the internal piston to press the damping liquid in the shell, thereby achieving the effect of vibration reduction. In order to realize the effectiveness of the NES, the design of the NES needs to meet certain mass ratio (the ratio of the mass of the NES to the mass of the controlled structure) and movement stroke. However, the internal space and bearing capacity of the wind power tower structure are limited, and the installation of the traditional NES will cause problems such as excessive additional mass and excessive movement stroke, thereby affecting the economy and effectiveness of the wind power tower. In addition, although the viscous damper is widely used in NES, it still has problems such as high cost, oil leakage, high temperature interference, difficulty in changing damping coefficient, etc. SUMMARY

[0005] The purpose of the present application is to provide a semi-active inertial non-linear energy sink for a wind power tower, which realizes the amplification of the inertial force of the damper through multi-stage speed change of the gear and rack mechanism, and generates real-time controllable eddy current damping force by high-speed rotation of the conductor in the mixed magnetic field. The mass-spring system, the inertial system, the eddy current damping system and the support system are distributed vertically, which facilitates the dissipation of heat generated during eddy current damping and avoids the problem of internal heat accumulation.

[0006] The application provides a semi-active inertial capacity non-linear energy sink of a wind power tower, which comprises a mass spring system, an inertial capacity system, an eddy current damping system and a support system, a sliding rail in the mass spring system is horizontally fixed on a bottom plate in the support system, a transmission gear in a mass block in the mass spring system is engaged with a first gear in the inertial capacity system, an inertia flywheel in the inertial capacity system is connected with a conductor cylinder in the eddy current damping system through a round ring connecting port and a bolt, three transmission shafts in the inertial capacity system are fixed on the bottom plate in the support system through deep groove bearings and rolling bearings, a permanent magnet back iron frame and an electromagnet back iron frame in the eddy current damping system are fixedly connected through a back iron connecting frame in the support system, and L-shaped supports in the support system are respectively located at two sides of an outer side surface of the electromagnet back iron frame in the eddy current damping system.

[0007] Preferably, the mass spring system comprises a non-linear spring, a mass block and a sliding rail, the sliding rail is provided with a rectangular groove, the mass block is in an n type, the mass block is internally provided with a transmission gear, the bottom of the mass block is provided with two rows of pulleys, the mass block is horizontally slid in the sliding rail groove through the pulleys, the two ends of the non-linear spring are fixed with cylindrical rubber pads, and the two ends of the non-linear spring are fixedly connected with the mass block and a controlled structure respectively.

[0008] Preferably, the inertial capacity system comprises an inertia flywheel and a variable speed gear set, the variable speed gear set comprises five gears and three transmission shafts, the gears comprise a first gear, a second gear, a third gear, a fourth gear and a fifth gear, the transmission shafts comprise a first transmission shaft, a second transmission shaft and a third transmission shaft, the first gear and the second gear are coaxial, the second gear and the third gear are engaged, the third gear and the fourth gear are coaxial, the fourth gear and the fifth gear are engaged, the fifth gear and the third transmission shaft are coaxial, the first gear and the first transmission shaft are coaxial, the third gear and the second transmission shaft are coaxial, the inertia flywheel is fixedly connected with the third transmission shaft, the inertia flywheel is in a disc type, and the upper surface of the inertia flywheel is provided with a round ring connecting port.

[0009] Preferably, the eddy current damping system comprises a conductor cylinder, a rectangular permanent magnet, a cylindrical electromagnet, a permanent magnet back iron frame and an electromagnet back iron frame, the permanent magnet back iron frame and the electromagnet back iron frame are both hollow regular octagonal columns, the permanent magnet back iron frame and the electromagnet back iron frame are in a direction perpendicular to the bottom plate, two rectangular permanent magnets are mounted on each outer side surface of the permanent magnet back iron frame, the permanent magnet back iron frame and the rectangular permanent magnets are fixedly connected through bolts, the rectangular permanent magnets are symmetrically distributed on each side surface of the permanent magnet back iron frame, the magnetization direction of the rectangular permanent magnets is perpendicular to the contact surface of the permanent magnet back iron frame, the two rectangular permanent magnets on a single side surface of the permanent magnet back iron frame have a gap and the magnetization directions thereof are opposite; the rectangular permanent magnets are parallel to the conductor cylinder and have a certain gap; and a cylindrical electromagnet is mounted at the geometric center of the mutually spaced inner side surfaces of the electromagnet back iron frame, and the electromagnet back iron frame and the cylindrical electromagnet are fixedly connected through screws.

[0010] Preferably, the permanent magnet back iron nest is inside the electromagnet back iron, and the center axes of the two are the same, and the fixed positions of the permanent magnet back iron and the electromagnet back iron are at the upper end of the hollow octagonal column.

[0011] Preferably, the support structure comprises L-shaped supports, back iron connecting frames and a bottom plate, the back iron connecting frame is a hollow isosceles trapezoid, the electromagnet back iron is fixedly connected with the two L-shaped supports through bolts, and the L-shaped supports are fixedly connected with the bottom plate through bolts.

[0012] Preferably, the mass block, the inertia flywheel, the L-shaped support, the bottom plate and the slide rail are steel structures, the electromagnet back iron, the permanent magnet back iron and the back iron connecting frame are steel structures, the conductor cylinder is a copper or aluminum member, and the variable speed gear set is a steel structure.

[0013] Preferably, the cuboid permanent magnet is a neodymium iron boron magnet, and the conductive coil of the cylindrical electromagnet is copper.

[0014] Therefore, the semi-active inertia capacity non-linear energy sink of the wind tower is adopted, the inertia force of the damper is amplified through multi-stage speed change of the gear and rack mechanism, the conductor is rotated at high speed in the mixed magnetic field to generate real-time controllable eddy current damping force, the mass spring system, the inertia capacity system, the eddy current damping system and the support system are vertically distributed, heat generated during eddy current damping is dissipated, and internal heat accumulation is avoided.

[0015] The technical solutions of the present application are described in further detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the semi-active inertia capacity non-linear energy sink of the wind tower of the present application;

[0017] Figure 2 It is a schematic diagram of the overall structure of the semi-active inertia capacity non-linear energy sink of the wind tower of the present application;

[0018] Figure 3 It is a schematic diagram of the overall structure of the semi-active inertia capacity non-linear energy sink of the wind tower of the present application; Figure 1 A-A section in the semi-active inertia capacity non-linear energy sink of the wind tower of the present application;

[0019] Figure 4 It is a schematic diagram of the local structure of the mass block and the variable speed gear set of the semi-active inertia capacity non-linear energy sink of the wind tower of the present application.

[0020] REFERENCE NUMERALS

[0021] 1 nonlinear spring; 2 mass block; 3 slide rail; 4 inertia flywheel; 5 variable speed gear set; 51 first gear; 52 second gear; 53 third gear; 54 fourth gear; 55 fifth gear; 56 first transmission shaft; 57 second transmission shaft; 58 third transmission shaft; 6 conductor cylinder; 7 cuboid permanent magnet; 8 cylinder permanent magnet; 9 permanent magnet back iron stand; 10 electromagnet back iron stand; 11 L-shaped support; 12 back iron connecting frame; 13 bottom plate. DETAILED DESCRIPTION

[0022] The technical solutions of the present application are further described below by means of the accompanying drawings and examples.

[0023] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the usual meaning understood by a person with ordinary skill in the art to which the present application belongs.

[0024] The terms "first", "second", and similar terms used in the present application do not indicate any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects appearing before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] Example 1

[0026] As shown in Figures 1-4 A semi-active inertial capacity nonlinear energy sink for a wind tower of the present application includes a mass spring system, an inertial capacity system, an eddy current damping system, and a support system. The slide rail 3 in the mass spring system is horizontally fixed on the bottom plate 13 of the support system. The transmission teeth of the mass block 2 in the mass spring system are engaged with the first gear 51 in the inertial capacity system. The inertia flywheel 4 in the inertial capacity system is connected to the conductor cylinder 6 in the eddy current damping system through a ring connection port and a bolt. The three transmission shafts in the inertial capacity system are fixed on the bottom plate 13 in the support system through deep groove bearings and rolling bearings. The permanent magnet back iron stand 9 and the electromagnet back iron stand 10 in the eddy current damping system are fixedly connected through the back iron connecting frame 12 in the support system. The L-shaped supports 11 in the support system are respectively located on the outer sides of the electromagnet back iron stand 10 in the eddy current damping system.

[0027] The mass spring system comprises a nonlinear spring 1, a mass block 2 and a slide rail 3, the slide rail 3 is provided with a rectangular groove, the mass block 2 is in the shape of n, the mass block 2 is internally provided with a transmission gear, the bottom of the mass block 2 is provided with two rows of pulleys, the mass block 2 is horizontally slid in the groove of the slide rail 3 through the pulleys, the two ends of the nonlinear spring 1 are fixed with cylindrical rubber pads, and the two ends of the nonlinear spring 1 are fixedly connected with the mass block 2 and a controlled structure;

[0028] The inertial flywheel 4 and the variable speed gear set 5, the variable speed gear set 5 comprises five gears and three transmission shafts, the gears comprise a first gear 51, a second gear 52, a third gear 53, a fourth gear 54 and a fifth gear 55, the transmission shafts comprise a first transmission shaft 56, a second transmission shaft 57 and a third transmission shaft 58, the first gear 51 and the second gear 52 are coaxial, the second gear 52 and the third gear 53 are engaged, the third gear 53 and the fourth gear 54 are coaxial, the fourth gear 54 and the fifth gear 55 are engaged, the fifth gear 55 and the third transmission shaft 58 are coaxial, the first gear 51 and the first transmission shaft 56 are coaxial, the third gear 53 and the second transmission shaft 57 are coaxial, the inertial flywheel 4 is fixedly connected with the third transmission shaft 58, the inertial flywheel 4 is in the shape of a disc, and the upper surface of the inertial flywheel 4 is provided with a circular ring connecting port; the inertial flywheel 4 in the inertial flywheel system is connected with the conductor cylinder 6 in the eddy current damping system through bolts.

[0029] The eddy current damping system comprises a conductor cylinder 6, a rectangular permanent magnet 7, a cylindrical electromagnet 8, a permanent magnet back iron 9 and an electromagnet back iron 10, the permanent magnet back iron 9 and the electromagnet back iron 10 are both hollow regular octagonal columns, the permanent magnet back iron 9 and the electromagnet back iron 10 are both in a direction perpendicular to the bottom plate 13, two rectangular permanent magnets 7 are mounted on each outer side surface of the permanent magnet back iron 9, the permanent magnet back iron 9 and the rectangular permanent magnet 7 are fixedly connected through bolts, the rectangular permanent magnets 7 are symmetrically distributed on each side surface of the permanent magnet back iron 9, the magnetization direction of the rectangular permanent magnet 7 is perpendicular to the direction of the contact surface of the permanent magnet back iron 9, and the two rectangular permanent magnets 7 on a single side surface of the permanent magnet back iron 9 have a gap and opposite magnetization directions; the rectangular permanent magnet 7 is parallel to the conductor cylinder 6 and has a certain gap; one cylindrical electromagnet 8 is mounted at the geometric center of each mutually spaced inner side surface of the electromagnet back iron 10, the electromagnet back iron 10 and the cylindrical electromagnet 8 are fixedly connected through screws, the N stage of the cylindrical electromagnet 8 is a free end after direct current is passed, and the cylindrical electromagnet 8 has a certain gap with the conductor cylinder 6; the size of the rectangular permanent magnet 7 and the cylindrical electromagnet 8 can be designed according to the requirement of the damping coefficient, the gap between the rectangular permanent magnet 7 and the conductor cylinder 6 can be designed according to the requirement of the damping coefficient, and the gap between the cylindrical electromagnet 8 and the conductor cylinder 6 can be designed according to the requirement of the damping coefficient;

[0030] The permanent magnet yoke 9 is nested inside the electromagnet yoke 10, and the center axes of the two are the same, and the fixed connection position of the permanent magnet yoke 9 and the electromagnet yoke 100 is at the upper end of the hollow octagonal column;

[0031] The support structure comprises L-shaped supports 11, a back yoke connecting frame 12, and a bottom plate 13. The back yoke connecting frame 12 is a hollow isosceles trapezoid. The electromagnet yoke 10 is fixedly connected to the two L-shaped supports 11 by bolts. The L-shaped supports 11 are fixedly connected to the bottom plate 13 by bolts.

[0032] The mass block 2, the inertia flywheel 4, the L-shaped supports 11, the bottom plate 13, and the slide rails 3 are all steel structures. The electromagnet yoke 10, the permanent magnet yoke 9, and the back yoke connecting frame 12 are all steel structures. The conductor cylinder 6 is made of copper or aluminum. The variable speed gear set 5 is a steel structure. The cuboid permanent magnet 7 is a neodymium iron boron magnet. The conductive coil of the cylindrical electromagnet 8 is made of copper.

[0033] When the mass block 2 moves horizontally, it drives the variable speed gear set 5 to rotate, thereby driving the inertia flywheel 4 to rotate at high speed around the vertical axis to generate an inertial force. The rotation speed amplification mechanism of the variable speed gear set 5 greatly amplifies the rotation speed of the inertia flywheel 4 around the axis, thereby obtaining a larger inertial force, effectively reducing the actual mass of the mass block 2 of the damper itself, and realizing the lightweight design of the damper. The edge of the inertia flywheel 4 has sufficient clearance to facilitate subsequent disassembly and size adjustment of the inertia flywheel 4.

[0034] The rotation of the inertia flywheel 4 will drive the conductor cylinder 6 to rotate around the vertical axis. According to the principle of electromagnetic induction, when the conductor cylinder 6 cuts the magnetic induction lines of the cuboid permanent magnet 7 and the cylindrical electromagnet 8, it will generate a damping force that hinders rotation. By adjusting the gap between the conductor and the magnet, the damping force output size can be easily adjusted.

[0035] The conductor cylinder 6 is located between the cuboid permanent magnet 7 and the cylindrical permanent magnet 8. By adjusting the size of the current flowing through the cylindrical electromagnet 8 in real time, the magnetic field strength of the cylindrical electromagnet 8 can be easily changed, thereby affecting the magnetic field strength of the cuboid permanent magnet 7, and further changing the size of the eddy current damping force. By changing the positive and negative polarities of the cylindrical electromagnet 8, the strength of the cuboid permanent magnet 7 can be switched between being enhanced and being weakened, effectively expanding the controllable range of the eddy current damping force. The addition of a control algorithm can realize semi-active control of the damping force of the damper to cope with external load conditions such as wind, waves, ice, and earthquakes.

[0036] Working principle: The vibration frequency of the damper is tuned to the vibration frequency of the controlled structure through the bottom plate and the nonlinear spring. When the controlled structure vibrates horizontally, the mass block slides horizontally along the slide rail, the transmission belt inside the mass block drives the gear set to rotate around the vertical shaft at high speed, and then drives the inertia flywheel to rotate at high speed, generating inertia force much larger than its actual weight. The conductor cylinder also rotates at high speed under the rotation of the inertia flywheel, and the permanent magnet and the electromagnet installed on the back iron frame on both sides of the conductor cylinder provide the magnetic field condition, so under the action of continuously cutting the magnetic induction lines, the conductor cylinder will generate strong eddy current damping force. The excess vibration energy of the controlled structure will eventually be dissipated in the form of heat. The use of nonlinear springs makes the damper still have good effect in a wide frequency band near the resonance frequency of the controlled structure. The back iron connecting frame fixed with the magnet back iron frame is a hollow structure, which expands the heat dissipation area of the damper, reduces the risk of heat accumulation of the damper, and increases the durability of the damper. According to the change of external dynamic load, the control algorithm is used to conveniently change the size of the current of the cylindrical electromagnet, so as to realize the enhancement or reduction of the magnetic field strength, and thus to obtain the optimal eddy current damping force in real time. The gear and rack type inerter system greatly reduces the actual weight of the damper and reduces the movement stroke of the damper. The cylindrical electromagnet plays a role in enhancing or weakening the magnetic field of the permanent magnet, and the installation form of the permanent magnet and the electromagnet on both sides of the conductor cylinder optimizes the adjustment range of the electromagnet to the whole magnetic field, which can realize the vibration control in a wider frequency band with the control algorithm.

[0037] Therefore, the application adopts the above-mentioned semi-active inertial mass damper for a wind power tower, introduces an inertial mass mechanism, greatly amplifies the rotating speed of the inertial flywheel through three-stage speed change of the variable speed gear set, and thus obtains greater inertial force, which on the one hand reduces the actual weight of the originally mass block, realizes lightweight design of the damper, and on the other hand shortens the horizontal movement stroke of the damper and saves the operation space of the damping device. By using the eddy current damping principle, the induced current is obtained by cutting the magnetic induction lines of the permanent magnet and the electromagnet through the conductor cylinder, and then the non-contact eddy current damping force is generated to dissipate energy, and the durability of the damper is improved. At the same time, the use of the permanent magnet back iron frame and the electromagnet back iron frame reduces the magnetic leakage phenomenon and improves the damping energy dissipation density. The cylindrical conductor has higher space utilization than the flat conductor. By controlling the size of the current and the positive and negative polarity sequence of the terminal post, the controllable range of the eddy current damping force is greatly increased. According to the external load condition of the wind power tower, the control algorithm is used to adjust the current of the cylindrical electromagnet in real time to obtain the optimal damping force and improve the effective frequency band of the damper. The mass spring system, the inertial mass system, the eddy current damping system and the support system are distributed along the vertical direction, are compact in assembly and have clear division of labor, and reasonably utilize the limited space to realize high-efficiency damping effect. In addition, the permanent magnet back iron frame and the electromagnet back iron frame are fixed by the back iron connecting frame, that is, the upper end of the eddy current damping system presents a large-area hollow state, which is convenient for dissipation of heat generated during eddy current damping energy dissipation and avoids the problem of internal heat accumulation.

[0038] The above embodiments are only used to illustrate the technical solutions of the present application but not to limit it, and although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. A semi-active inerter non-linear energy sink for a wind turbine tower, characterized by, The mass spring system, the inertial flywheel, the third transmission shaft, the variable speed gear set, the permanent magnet back iron frame, the electromagnet back iron frame, the L-shaped support, the conductor cylinder, the cuboid permanent magnet and the cylindrical electromagnet are arranged in the support system. The mass spring system includes a nonlinear spring, a mass block and a slide rail, the slide rail in the mass spring system is horizontally fixed on a bottom plate in the support system, a transmission gear in the mass block in the mass spring system is engaged with a first gear in the inertial flywheel system, the inertial flywheel system includes an inertial flywheel and a variable speed gear set, the inertial flywheel is disc-shaped, the inertial flywheel is fixedly connected with a third transmission shaft, an upper surface of the inertial flywheel is provided with a ring connecting port, the inertial flywheel in the inertial flywheel system is connected with a conductor cylinder in the eddy current damping system through the ring connecting port and bolts, three transmission shafts in the inertial flywheel system are fixed on the bottom plate in the support system through deep groove bearings and rolling bearings, a permanent magnet back iron frame and an electromagnet back iron frame in the eddy current damping system are fixedly connected through a back iron connecting frame in the support system, and L-shaped supports in the support system are respectively located on both sides of an outer side surface of the electromagnet back iron frame in the eddy current damping system.

2. A semi-active inerter non-linear energy sink for a wind turbine tower according to claim 1, wherein, When a controlled structure is horizontally vibrated, the nonlinear spring drives the mass block to horizontally slide along the slide rail, the transmission gear in the mass block drives the variable speed gear set to rotate at a high speed around a vertical shaft, and then drives the inertial flywheel to rotate at a high speed.

3. The semi-active inerter non-linear energy sink for a wind tower according to claim 1, wherein, The eddy current damping system includes the conductor cylinder, the cuboid permanent magnet, the cylindrical electromagnet, the permanent magnet back iron frame and the electromagnet back iron frame, the permanent magnet back iron frame and the electromagnet back iron frame are both hollow regular octagonal columns, the permanent magnet back iron frame and the electromagnet back iron frame are arranged in a direction perpendicular to the bottom plate, two cuboid permanent magnets are arranged on each outer side surface of the permanent magnet back iron frame and fixedly connected with the permanent magnet back iron frame through bolts, the cuboid permanent magnets are symmetrically arranged on each side surface of the permanent magnet back iron frame, the magnetization direction of the cuboid permanent magnets is perpendicular to the contact surface of the permanent magnet back iron frame, and the two cuboid permanent magnets on a single side surface of the permanent magnet back iron frame have a gap and opposite magnetization directions; the cuboid permanent magnets are arranged in parallel with the conductor cylinder and have a certain gap; and the cylindrical electromagnets are arranged at the geometric centers of the mutually spaced inner side surfaces of the electromagnet back iron frame and fixedly connected with the electromagnet back iron frame through screws.

4. The semi-active inerter non-linear energy sink for a wind tower according to claim 1, wherein, The slide rail is provided with a rectangular groove, the mass block is n-shaped, the mass block is internally provided with a transmission gear, the bottom of the mass block is provided with two rows of pulleys, the mass block is horizontally slid in the slide rail groove through the pulleys, the two ends of the nonlinear spring are fixed with cylindrical rubber pads, and the two ends of the nonlinear spring are fixedly connected with the mass block and the controlled structure respectively. The variable speed gear set includes five gears and three transmission shafts, the gears include a first gear, a second gear, a third gear, a fourth gear and a fifth gear, the transmission shafts include a first transmission shaft, a second transmission shaft and a third transmission shaft, the first gear is coaxial with the second gear, the second gear is engaged with the third gear, the third gear is coaxial with the fourth gear, the fourth gear is engaged with the fifth gear, the fifth gear is coaxial with the third transmission shaft, the first gear is coaxial with the first transmission shaft, and the third gear is coaxial with the second transmission shaft. The permanent magnet back iron frame is nested in the interior of the electromagnet back iron frame and has the same central axis as the electromagnet back iron frame, and the permanent magnet back iron frame and the electromagnet back iron frame are fixedly connected at the upper end of the hollow regular octagonal column.

5. A semi-active inerter non-linear energy sink for a wind turbine tower according to claim 1, wherein, The support structure comprises an L-shaped support, a back iron connecting frame and a bottom plate, the back iron connecting frame is a hollow isosceles trapezoid, the electromagnet back iron frame is fixedly connected with the two L-shaped supports through bolts, and the L-shaped supports are fixedly connected with the bottom plate through bolts.

6. A semi-active inerter non-linear energy sink for a wind turbine tower according to claim 4, wherein, The mass, the inertia flywheel, the L-shaped support, the bottom plate and the slide rail are all steel structures, the electromagnet back iron frame, the permanent magnet back iron frame and the back iron connecting frame are all steel structures, the conductor cylinder is a copper or aluminum member, and the variable speed gear set is a steel structure.

7. A semi-active inerter non-linear energy sink for a wind turbine tower according to claim 1, wherein, The cuboid permanent magnet is a neodymium iron boron magnet, and the conductive coil of the cylindrical electromagnet is copper.

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