Semi-active inerter nonlinear energy trap of wind power tower

Abstract

The semi-active inerter nonlinear energy trap of the wind power tower comprises a mass spring system, an inerter system, an eddy current damping system and a supporting system, a sliding rail in the mass spring system is horizontally fixed to a bottom plate of the supporting system, and transmission teeth of a mass block in the mass spring system are meshed with a first gear in the inerter system; an inertia flywheel in the inerter system connects a circular ring connector with a conductor cylinder in the eddy current damping system through bolts, and three transmission shafts in the inerter system are fixed to a bottom plate in the supporting system through deep groove bearings and rolling bearings. The mass spring system, the inerter system, the eddy current damping system and the supporting system are distributed in the vertical direction, heat energy generated during eddy current damping energy consumption is conveniently dissipated, and the problem of internal heat accumulation is avoided.

Description

Technical Field

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

[0002] Onshore wind power towers will inevitably face the action of external wind loads during service, while offshore wind power towers also need to face the influence of external loads such as wave loads and ice loads. The resulting vibration problems not only endanger the power generation efficiency of the wind turbines, but even cause structural safety problems. The Nonlinear Energy Sinks (NES) is an effective passive control technology for dealing with the vibration problems of high-rise structures. By installing NES in the structure, the problem of excessive structural response caused by external dynamic loads can be solved.

[0003] NES includes a mass block, a non-linear spring element and a damping energy dissipation element. The mass block is connected to the controlled structure through a non-linear spring and a damping energy dissipation element. When the controlled structure vibrates, the mass block moves back and forth along a predetermined trajectory, repeatedly stretching and compressing the spring and the damping element, thereby playing the role of energy transfer and energy dissipation for vibration reduction. Compared with linear shock absorbers, the non-linear energy sink has the characteristics of targeted energy transfer and does not change the natural frequency of the main structure, and can achieve wide-band and efficient vibration control.

[0004] The damping energy dissipation element of the commonly used NES is a viscous damper, including a piston, a housing and damping fluid. By the reciprocating motion of the internal piston to squeeze the damping fluid in the housing, the mechanical energy of the controlled structure is converted into internal energy and dissipated, thereby achieving the vibration reduction effect. In order to achieve the effectiveness of NES, the design of NES needs to meet a certain mass ratio (the ratio of the mass of NES to the mass of the controlled structure) and the movement stroke. However, the internal space and bearing capacity of the wind power tower structure are limited, and installing traditional NES will result in problems such as excessive additional mass and excessive movement stroke, which will in turn affect the economy and effectiveness of the wind power tower. In addition, although viscous dampers are widely used in NES, there are problems such as high cost, oil leakage, interference by high temperature, and difficulty in changing the damping coefficient. Summary of the Invention

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

[0006] The present invention provides a semi-active inertial mass non-linear energy sink for a wind power tower, which includes a mass-spring system, an inertial mass system, an eddy current damping system and a support system. The slide rail in the mass-spring system is horizontally fixed on the bottom plate of the support system. The transmission gear of the mass block in the mass-spring system meshes with the first gear in the inertial mass system. The inertial flywheel in the inertial mass system connects the circular ring connection port and the conductor cylinder in the eddy current damping system through bolts. The three transmission shafts in the inertial mass system are fixed on the bottom plate in the support system through deep groove bearings and rolling bearings. The permanent magnet back iron frame and the electromagnet back iron frame in the eddy current damping system are fixedly connected through the back iron connection frame in the support system. The L-shaped brackets in the support system are respectively located on both outer sides of the electromagnet back iron frame in the eddy current damping system.

[0007] Preferably, the mass-spring system includes a non-linear spring, a mass block and a slide rail. The slide rail is provided with rectangular grooves. The mass block is in an n shape. The inside of the mass block is provided with transmission teeth. The bottom of the mass block is provided with two rows of pulleys. The mass block slides horizontally in the slide rail groove through the pulleys. The two ends of the non-linear spring are fixed with cylindrical rubber pads. The two ends of the non-linear spring are respectively fixedly connected with the mass block and the controlled structure.

[0008] Preferably, the inertial mass system includes an inertial flywheel and a speed-changing gear set. The speed-changing 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 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 inertial flywheel is fixedly connected with the third transmission shaft. The inertial flywheel is disc-shaped. There is a circular ring connection port on the upper surface of the inertial flywheel.

[0009] Preferably, the eddy current damping system includes a conductor cylinder, a rectangular permanent magnet, a cylindrical electromagnet, a permanent magnet back iron frame and an electromagnet back iron frame. Both the permanent magnet back iron frame and the electromagnet back iron frame are hollow regular octagonal columns. Both the permanent magnet back iron frame and the electromagnet back iron frame are in a direction perpendicular to the bottom plate. Two cuboid permanent magnets are installed on each outer side of the permanent magnet back iron frame. The permanent magnet back iron frame and the cuboid permanent magnets are fixedly connected through bolts. The cuboid permanent magnets are symmetrically distributed on each side of the permanent magnet back iron frame. The magnetization direction of the cuboid permanent magnet is perpendicular to the contact surface of the permanent magnet back iron frame. There is a gap between the two cuboid permanent magnets on a single side of the permanent magnet back iron frame and their magnetization directions are opposite; The cuboid permanent magnets are arranged parallel to the conductor cylinder and there is a certain gap; A cylindrical electromagnet is installed at the geometric center of the mutually spaced inner sides of the electromagnet back iron frame. The electromagnet back iron frame and the cylindrical electromagnet are fixedly connected through screws.

[0010] Preferably, the permanent magnet back iron frame is nested inside the electromagnet back iron frame and their central axes are the same. The fixed connection position of the permanent magnet back iron frame and the electromagnet back iron frame is at the upper end of the hollow regular octagonal column.

[0011] Preferably, the support structure includes an L-shaped bracket, 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 to two L-shaped brackets by bolts, and the L-shaped brackets are fixedly connected to the bottom plate by bolts.

[0012] Preferably, the mass block, the inertia flywheel, the L-shaped brackets, the bottom plate, and the slide rails are all made of steel structure. The electromagnet back iron frame, the permanent magnet back iron frame, and the back iron connecting frame are all made of steel structure. The conductor cylinder is a copper or aluminum component, and the speed change gear set is made of steel structure.

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

[0014] Therefore, the present invention adopts the above-mentioned semi-active inertial capacitance non-linear energy trap for a wind power tower. Through the multi-stage speed change of the gear rack mechanism, the inertial force of the damper is amplified, and a real-time controllable eddy current damping force is generated by the high-speed rotation of the conductor in the hybrid magnetic field. The mass spring system, the inertial capacitance system, the eddy current damping system, and the support system are distributed vertically, which is convenient for the dissipation of the heat generated during the eddy current damping energy consumption and avoids the problem of internal heat accumulation.

[0015] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overall structure of a semi-active inertial capacitance non-linear energy trap for a wind power tower of the present invention; Figure 2 is a top view of the overall structure of a semi-active inertial capacitance non-linear energy trap for a wind power tower of the present invention; Figure 3 is a semi-active inertial capacitance non-linear energy trap for a wind power tower of the present invention Figure 1 A-A sectional view; Figure 4 is a schematic diagram of a partial structure of the cooperation between the mass block and the speed change gear set of a semi-active inertial capacitance non-linear energy trap for a wind power tower of the present invention.

[0017] Reference Signs 1. Nonlinear spring; 2. Mass block; 3. Slide rail; 4. Inertia flywheel; 5. Transmission 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. Cylindrical permanent magnet; 9. Permanent magnet back iron frame; 10. Electromagnet back iron frame; 11. L-shaped bracket; 12. Back iron connecting frame; 13. Bottom plate. Detailed implementation mode

[0018] The technical solution of the present invention will be further described below with reference to the drawings and embodiments.

[0019] Unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meaning understood by those with ordinary skills in the field to which the present invention belongs.

[0020] The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0021] Embodiment 1 As Figures 1 - 4 shown, a semi-active inertia-capacitance non-linear energy sink for a wind power tower of the present invention includes a mass-spring system, an inertia-capacitance 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 gear of the mass block 2 in the mass-spring system meshes with the first gear 51 in the inertia-capacitance system. The inertia flywheel 4 in the inertia-capacitance system is connected to the conductor cylinder 6 in the eddy current damping system by bolts through a circular ring connection port. The three transmission shafts in the inertia-capacitance system are fixed on the bottom plate 13 in the support system through deep groove bearings and rolling bearings. The permanent magnet back iron frame 9 and the electromagnet back iron frame 10 in the eddy current damping system are fixedly connected through the back iron connecting frame 12 in the support system. The L-shaped brackets 11 in the support system are respectively located on both sides of the outer side of the electromagnet back iron frame 10 in the eddy current damping system; The mass-spring system includes a non-linear 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 an "n" shape. The interior of the mass block 2 is provided with transmission teeth. The bottom of the mass block 2 is provided with two rows of pulleys. The mass block 2 slides horizontally in the groove of the slide rail 3 through the pulleys. The two ends of the non-linear spring 1 are fixed with cylindrical rubber pads. The two ends of the non-linear spring 1 are fixedly connected to the mass block 2 and the controlled structure. The inertia-capacitance system includes an inertia flywheel 4 and a speed-changing gear set 5. The speed-changing gear set 5 includes five gears and three transmission shafts. The gears include a first gear 51, a second gear 52, a third gear 53, a fourth gear 54, and a fifth gear 55. The transmission shafts include 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 inertia flywheel 4 and the third transmission shaft 58 are fixedly connected. The inertia flywheel 4 is disc-shaped. There is a circular ring connection port on the upper surface of the inertia flywheel 4. The inertia flywheel 4 in the inertia-capacitance system is connected to the conductor cylinder 6 in the eddy current damping system through bolts at the circular ring connection port.

[0022] The eddy current damping system includes a conductor cylinder 6, a rectangular permanent magnet 7, a cylindrical electromagnet 8, a permanent magnet back iron frame 9, and an electromagnet back iron frame 10. Both the permanent magnet back iron frame 9 and the electromagnet back iron frame 10 are hollow regular octagonal columns. Both the permanent magnet back iron frame 9 and the electromagnet back iron frame 10 are in a direction perpendicular to the bottom plate 13. Two cuboid permanent magnets 7 are installed on each outer side surface of the permanent magnet back iron frame 9. The permanent magnet back iron frame 9 and the cuboid permanent magnets 7 are fixedly connected by bolts. The cuboid permanent magnets 7 are symmetrically distributed on each side surface of the permanent magnet back iron frame 9. The magnetization direction of the cuboid permanent magnet 7 is perpendicular to the contact surface of the permanent magnet back iron frame 9. There is a gap between the two cuboid permanent magnets 7 on a single side surface of the permanent magnet back iron frame 9, and the magnetization directions are opposite; The cuboid permanent magnet 7 is arranged parallel to the conductor cylinder 6 and there is a certain gap; A cylindrical electromagnet 8 is installed at the geometric center of the mutually spaced inner side surfaces of the electromagnet back iron frame 10. The electromagnet back iron frame 10 and the cylindrical electromagnet 8 are fixedly connected by screws. After direct current is passed through the cylindrical electromagnet 8, the N pole is the free end. There is a certain gap between the cylindrical electromagnet 8 and the conductor cylinder 6; The sizes of the cuboid permanent magnet 7 and the cylindrical electromagnet 8 can be designed according to the requirements of the damping coefficient. The gap between the cuboid permanent magnet 7 and the conductor cylinder 6 can be designed according to the requirements of the damping coefficient. The gap between the cylindrical electromagnet 8 and the conductor cylinder 6 can be designed according to the requirements of the damping coefficient; The permanent magnet back iron frame 9 is nested inside the electromagnet back iron frame 10, and their central axes are the same. The fixed connection position of the permanent magnet back iron frame 9 and the electromagnet back iron frame 100 is at the upper end of the hollow regular octagonal prism. The support structure includes an L-shaped bracket 11, a back iron connecting frame 12, and a bottom plate 13. The back iron connecting frame 12 is a hollow isosceles trapezoid. The electromagnet back iron frame 10 is fixedly connected to the two L-shaped brackets 11 by bolts, and the L-shaped bracket 11 is fixedly connected to the bottom plate 13 by bolts. The mass block 2, the inertial flywheel 4, the L-shaped bracket 11, the bottom plate 13, and the slide rail 3 are all made of steel. The electromagnet back iron frame 10, the permanent magnet back iron frame 9, and the back iron connecting frame 12 are all made of steel. The conductor cylinder 6 is a copper or aluminum component, and the speed change gear set 5 is made of steel. The cuboid permanent magnet 7 is a neodymium iron boron magnet, and the conductive coil of the cylindrical electromagnet 8 is made of copper.

[0023] When the mass block 2 moves horizontally, it drives the speed change gear set 5 to rotate, thereby driving the inertial flywheel 4 to rotate at a high speed around the vertical axis, generating an inertial force. The speed amplification mechanism of the speed change gear set 5 greatly amplifies the rotational speed of the inertial flywheel 4 around the axis, thereby obtaining a greater inertial force, effectively reducing the actual mass of the mass block 2 of the damper itself, and realizing the lightweight design of the damper. There is enough space left at the edge of the inertial flywheel 4 to facilitate subsequent disassembly and adjustment of the size of the inertial flywheel 4.

[0024] The rotation of the inertial flywheel 4 drives 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, a damping force that hinders rotation will be generated. The damping force output can be conveniently adjusted by adjusting the gap between the conductor and the magnet.

[0025] The conductor cylinder 6 is located between the cuboid permanent magnet 7 and the cylindrical permanent magnet 8. By adjusting the magnitude of the current passing through the cylindrical electromagnet 8 in real time, the magnetic field intensity of the cylindrical electromagnet 8 can be conveniently changed, thereby affecting the magnetic field intensity of the cuboid permanent magnet 7, and further changing the magnitude of the eddy current damping force. By changing the positive and negative pole order of the power connection terminals of the cylindrical permanent magnet 8, the enhancement or weakening of the intensity of the cuboid permanent magnet 7 can be switched, effectively amplifying the controllable range of the eddy current damping force. The addition of a control algorithm can realize the semi-active control of the damping force of the damper to cope with external load conditions such as wind, wave, ice, and earthquake.

[0026] Working principle: The vibration damping device is fixed to the controlled structure through the bottom plate and the non-linear spring. The vibration frequency of the vibration damping device is tuned to be near the vibration frequency of the controlled structure. When the controlled structure undergoes horizontal vibration, the non-linear spring drives the mass block to slide horizontally along the slide rail. The transmission teeth inside the mass block drive the variable speed gear set to rotate at high speed around the vertical axis, and then drive the inertial flywheel to rotate at high speed, generating an inertial force much larger than its actual counterweight. The conductor cylinder also rotates at high speed driven by the rotation of the inertial flywheel. The permanent magnets and electromagnets respectively assembled on the back iron frames on both sides of the conductor cylinder provide the magnetic field conditions. Therefore, under the action of the conductor cylinder continuously cutting the magnetic induction lines, a strong eddy current damping force will be generated. The energy of the excessive vibration of the controlled structure will ultimately be dissipated in the form of heat. The application of the non-linear spring enables the damper to still have good effects within a relatively wide frequency band near the resonance frequency of the controlled structure. The back iron connecting frame for fixing the magnet back iron frame is a hollow structure, which expands the heat dissipation area of the vibration damping device, reduces the risk of heat accumulation of the device, and increases the durability of the device. According to the change of the external dynamic load, the control algorithm is used to conveniently change the magnitude of the energizing current of the cylindrical electromagnet, so as to enhance or reduce the magnetic field intensity, and thus obtain the optimal eddy current damping force in real time. The gear-rack type inertance system greatly reduces the actual counterweight of the vibration damping device and reduces the movement stroke of the damper. The cylindrical electromagnet plays the role of enhancing or weakening the magnetic field of the permanent magnet. The installation form with the permanent magnet and the electromagnet on both sides of the conductor cylinder optimizes the adjustment range of the electromagnet for the entire magnetic field. Cooperating with the control algorithm, vibration damping control within a wider frequency band can be achieved.

[0027] Therefore, the present invention adopts the above-mentioned semi-active inertial capacitance non-linear energy sink for a wind power tower, introduces the inertial capacitance mechanism, and greatly amplifies the rotational speed of the inertial flywheel through three-stage speed change of the variable speed gear set to obtain a greater inertial force. On the one hand, it reduces the actual counterweight of the original mass block and realizes the lightweight design of the damper. On the other hand, it shortens the horizontal movement stroke of the damper and saves the operating space of the vibration reduction device. Using the principle of eddy current damping, an induced current is obtained by cutting the magnetic induction lines of the permanent magnet and the electromagnet with the conductor cylinder, and then a non-contact eddy current damping force is generated to consume energy, improving the durability of the damper. 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 consumption density. The cylindrical conductor has a higher space utilization rate than the flat conductor. By controlling the magnitude of the energizing current and the positive and negative electrode sequence of the terminal posts, the controllable range of the eddy current damping force is greatly increased. According to the external load condition of the wind power tower, the energizing current of the cylindrical electromagnet is adjusted in real time by using a control algorithm to obtain the optimal damping force and improve the effective frequency band of the damper for vibration reduction. The mass-spring system, the inertial capacitance system, the eddy current damping system and the support system are distributed vertically, with a compact assembly and clear division of labor, and reasonably utilize the limited space to achieve an efficient vibration reduction effect. In addition, the permanent magnet back iron frame and the electromagnet back iron frame are fixedly connected through the back iron connecting frame, that is, a large-area hollow state appears at the upper end of the eddy current damping system, which is convenient for the dissipation of the heat generated during the eddy current damping energy consumption and avoids the problem of internal heat accumulation.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions of the present invention or make equivalent replacements, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A semi-active inertia nonlinear energy sink for a wind power tower, characterized in that: The invention comprises a mass spring system, an inertia capacitance system, an eddy current damping system and a support system. The slide rail in the mass spring system is horizontally fixed on the bottom plate of the support system. The transmission teeth of the mass block in the mass spring system mesh with the first gear in the inertia capacitance system. The inertia flywheel in the inertia capacitance system connects the annular connecting port with the conductor cylinder in the eddy current damping system through bolts. The three transmission shafts in the inertia capacitance system are fixed on the bottom plate in the support system through deep groove bearings and rolling bearings. The permanent magnet back iron frame and the electromagnet back iron frame in the eddy current damping system are fixedly connected through the back iron connecting frame in the support system. The L-shaped brackets in the support system are respectively located on both sides of the outer side of the electromagnet back iron frame in the eddy current damping system.

2. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 1, characterized in that: The mass-spring system includes a nonlinear spring, a mass block and a slide rail. The slide rail is provided with a rectangular groove. The mass block is n-shaped. Transmission teeth are provided inside the mass block. Two rows of pulleys are provided at the bottom of the mass block. The mass block slides horizontally in the groove of the slide rail through the pulleys. Cylindrical rubber pads are fixed at both ends of the nonlinear spring. The two ends of the nonlinear spring are fixedly connected to the mass block and the controlled structure respectively.

3. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 1, characterized in that: The inertia capacity system includes an inertia flywheel and a speed change gear set, the speed change 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 shaft includes 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 meshed, the third gear and the fourth gear are coaxial, the fourth gear and the fifth gear are meshed, 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 and the third transmission shaft are fixedly connected, the inertia flywheel is a disc shape, and a circular ring connecting port is provided on the upper surface of the inertia flywheel.

4. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 1, characterized in that: 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. Both the permanent magnet back iron frame and the electromagnet back iron frame are hollow regular octagonal columns. Both the permanent magnet back iron frame and the electromagnet back iron frame are in a direction perpendicular to a bottom plate. Two rectangular permanent magnets are installed on each outer side of the permanent magnet back iron frame. The permanent magnet back iron frame and the rectangular permanent magnets are fixedly connected by bolts. The rectangular permanent magnets are symmetrically distributed on each side of the permanent magnet back iron frame. The magnetizing direction of the rectangular permanent magnets is perpendicular to the contact surface of the permanent magnet back iron frame. There is a gap between the two rectangular permanent magnets on a single side of the permanent magnet back iron frame and the magnetizing directions are opposite. The rectangular permanent magnet is arranged in parallel with the conductor cylinder and there is a certain gap. A cylindrical electromagnet is installed at the geometric center of the inner side of the electromagnet back iron frame that is spaced apart from each other. The electromagnet back iron frame and the cylindrical electromagnet are fixedly connected by screws.

5. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 4, characterized in that: The permanent magnet back iron frame is nested inside the electromagnet back iron frame and the central axes of the two are the same. The fixed position of the permanent magnet back iron frame and the electromagnet back iron frame is at the upper end of the hollow regular octagonal column.

6. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 1, characterized in that: The supporting structure includes an L-shaped bracket, 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 to the two L-shaped brackets by bolts, and the L-shaped bracket is fixedly connected to the bottom plate by bolts.

7. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 5, characterized in that: The mass block, inertia flywheel, L-shaped bracket, bottom plate and slide rail are all steel structures, the electromagnet back iron frame, permanent magnet back iron frame and back iron connecting frame are all steel structures, the conductor cylinder is a copper or aluminum component, and the speed change gear set is a steel structure.

8. The semi-active inertia nonlinear energy sink of a wind power tower according to claim 4, characterized in that: The rectangular permanent magnet is a neodymium iron boron magnet, and the conductive coil of the cylindrical electromagnet is made of copper.

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