Magnetic eddy current damping device, frequency modulated mass magnetic eddy current damper and method for suppressing vibration

Abstract

The present invention discloses a magnetic eddy current damping device, a frequency-modulated mass magnetic eddy current damper and a method for suppressing vibration. The magnetic eddy current damping device comprises: a support frame, a stator assembly, a rotor assembly and a gear rack mechanism; the stator assembly and the rotor assembly are disc-shaped or cylindrical parts made of conductor material / permanent magnetic material and permanent magnetic material / conductor material respectively, and the gear rack mechanism converts the linear motion of the mass block into the rotational motion of the rotor assembly. When the permanent magnetic material and the conductor material move relative to each other, the stator assembly will generate a damping torque on the rotor assembly through non-contact magnetic force, thereby changing the vibration frequency of the system and suppressing the amplitude. It has the characteristics of non-contact, no friction and wear, adjustable damping coefficient, high reliability, long service life, etc. The magnetic eddy current damper of the present invention comprises: a swing rod, a counterweight, a frequency-modulated spring and the above-mentioned magnetic eddy current damping device. The method for suppressing vibration is achieved by installing the above-mentioned frequency-modulated mass magnetic eddy current damper on the vibration object to be suppressed.

Description

Technical Field

[0001] The present invention belongs to the technical field of facility vibration suppression devices and methods, and in particular relates to a magnetic eddy current damping device, a frequency-modulated mass magnetic eddy current damper and a vibration suppression method. Background Art

[0002] The frequency-tuned mass magnetic eddy current damper is a vibration control device that has been studied earlier and is widely used. The frequency-tuned mass magnetic eddy current damper has obvious anti-seismic and anti-wind effects on the structure, has little impact on the building function, and is easy to install and repair and replace. The common frequency-tuned mass magnetic eddy current damper structure mainly includes a mass block, an elastic element, and a damping element. When the external structure vibrates under the action of an external load, it will also push the frequency-tuned mass magnetic eddy current damper to move together. The vibration of the frequency-tuned mass magnetic eddy current damper is not synchronized with the excitation, and the inertial force it generates reacts on the external structure, which can play a role in suppressing vibration. The frequency-tuned mass magnetic eddy current damper has a wide range of applications: high-rise buildings, bridges, high towers (such as chimneys, transmission towers), wind turbines, nuclear power, etc.

[0003] Common frequency-modulated mass eddy current dampers have complex structures, large installation quantities, and limited adjustment ranges. Multiple sets of frequency-modulated mass eddy current dampers need to be installed to control multi-degree-of-freedom vibrations. In comparison, single-pendulum frequency-modulated mass eddy current dampers are simple in form and design, have various ways to adjust the natural vibration period, and a single damper can achieve multi-degree-of-freedom vibration control.

[0004] Common dampers include mechanical dampers and oil dampers. Mechanical dampers are mostly inertial structures. Although they have a long service life, they occupy a large space, have a limited load range, and are prone to getting stuck. Oil dampers have a large load range, a compact structure, and are not easy to get stuck, but there are always problems with sealing and leakage, and their long-term reliability is low and their service life is short. Summary of the invention

[0005] The first object of the present invention is to provide a magnetic eddy current damping device, the second object of the present invention is to provide a frequency-tuned mass magnetic eddy current damper, and the third object of the present invention is to provide a method for suppressing vibration.

[0006] The magnetic levitation frequency modulation mass magnetic eddy current damper is a new high-tech product. Its basic principle is to follow the basic law of magnetic induction, namely "Lenz's law". When the conductor and the magnet rotate relative to each other, the magnetic line of force is cut, and then eddy currents are generated in the conductor material. The eddy current generates an induced magnetic field in the conductor, thereby damping the rotation of the disk. The magnetic eddy current damping device is invented on the basis of these laws, combined with rare earth permanent magnet technology, new transmission technology and high-precision equipment manufacturing technology. Because it utilizes the non-contact transmission characteristics of magnetic force, it has the characteristics of simple and compact structure, no friction and wear, adjustable damping force, large load range, maintenance-free, high reliability and long life, which can effectively solve the problems existing in traditional damping equipment.

[0007] The first aspect of the present invention provides a magnetic eddy current damping device, which includes: a support frame, a stator assembly, a rotor assembly and a gear rack mechanism; the stator assembly is provided with a first magnetic component, and the stator assembly is fixedly connected to the support frame; the rotor assembly is provided with a second magnetic component, and the rotor assembly is rotatably mounted on the support frame through a rotating shaft, and a gear is mounted on the end of the rotating shaft; the first magnetic component is a disc-shaped or cylindrical part made of a conductor, and the second magnetic component is a disc-shaped or cylindrical part for arranging and mounting permanent magnets; or, the first magnetic component is a disc-shaped or cylindrical part for arranging and mounting permanent magnets, and the second magnetic component is a disc-shaped or cylindrical part made of a conductor; the rack of the gear rack mechanism is meshed with the gear, and when the rack moves linearly, the rack drives the gear and the connected second magnetic component to rotate; when the first magnetic component and the second magnetic component rotate relative to each other, the stator assembly generates a damping torque on the rotor assembly through non-contact magnetic force, thereby changing the vibration frequency of the system and reducing the amplitude.

[0008] The eddy current damping device of the present invention as described above, further, the stator assembly includes a first stator backplate, a second stator backplate, a backplate spacer sleeve and a conductor disk, the first stator backplate and the second stator backplate are spaced and connected by the backplate spacer sleeve, and the conductor disk is respectively arranged on the inner side of the first stator backplate and the second stator backplate.

[0009] The magnetic eddy current damping device of the present invention as described above, further, the rotor assembly includes a magnetic steel mounting base plate, a magnetic steel pressure plate and a permanent magnet, the magnetic steel mounting base plate is provided with a magnetic steel mounting groove, the permanent magnet is installed in the magnetic steel mounting groove, the magnetic steel mounting base plate is connected to the rotating shaft; the magnetic steel pressure plate is connected to the magnetic steel mounting base plate and covers the magnetic steel mounting groove.

[0010] The magnetic eddy current damping device of the present invention as described above, further, the second stator back plate is installed with a bearing outer ring, and the magnetic steel mounting base plate is installed with a bearing inner ring that matches the bearing outer ring.

[0011] The magnetic eddy current damping device of the present invention as described above, further, a positioning groove is provided through the rack, the cross-section of the positioning groove is a rectangular structure, including a groove front surface, a groove top surface and a groove bottom surface; a rack positioning device is installed on the support frame, and the rack positioning device includes a roller support frame, a first roller and a second roller, the first roller is installed on the roller support frame through a pin shaft, and the first roller is in contact with the groove front surface; the second roller is installed on the roller support frame through a connecting shaft, and the number of the second rollers is two, which are in contact with the groove top surface and the groove bottom surface respectively.

[0012] The eddy current damping device of the above embodiment adopts the permanent magnet eddy current braking principle, so that the stator assembly and the rotor assembly can produce a braking effect in a non-contact state, and there is no friction, no wear, no need for lubrication maintenance and transfer medium, which greatly extends the service life of the product.

[0013] The second aspect of the present invention provides a frequency-modulated mass magnetic eddy current damper, which includes: a pendulum, a counterweight, a frequency-modulated spring and a magnetic eddy current damping device, wherein the counterweight is fixedly connected to the lower end of the pendulum, the first end of the frequency-modulated spring is connected to the lower part of the counterweight, and the magnetic eddy current damping device is a magnetic eddy current damping device as described in any of the above items, and the support frame of the magnetic eddy current damping device is connected to the lower part of the counterweight.

[0014] The frequency modulated mass magnetic eddy current damper of the present invention as described above, further, the number of the magnetic eddy current damping devices is two, and the first magnetic eddy current damping device and the second magnetic eddy current damping device are arranged in a mutually perpendicular manner.

[0015] The frequency modulated mass magnetic eddy current damper of the present invention as described above, further, the number of the magnetic eddy current damping devices is three, and the angle between two adjacent magnetic eddy current damping devices is 120 degrees.

[0016] The frequency modulated mass magnetic eddy current damper of the present invention as described above, further, different magnetic eddy current damping devices are arranged at the same height position or different height positions in the vertical direction.

[0017] The present invention also provides a wind power generation system, wherein at least a first platform and a second platform are arranged in a tower of the wind power generation system, and the first platform is located above the second platform; a frequency-modulated mass magnetic eddy current damper as described in any of the above items is installed in the tower, the upper end of the rocker arm is connected to the first platform, the second end of the frequency-modulated spring is connected to the second platform, and the rack of the magnetic eddy current damping device is connected to the inner wall of the tower.

[0018] The present invention also provides a building structure, wherein a frequency-modulated mass magnetic eddy current damper as described in any of the above items is installed inside the building structure, the upper end of the pendulum rod is connected to the upper platform inside the building structure, the second end of the frequency-modulated spring is connected to the lower platform inside the building structure, and the rack of the magnetic eddy current damping device is connected to the building structure.

[0019] The present invention also provides a method for suppressing vibration, comprising the following steps: setting a first mounting base and a second mounting base on the vibration object to be suppressed, the first mounting base being located above the second mounting base; installing a frequency-modulated mass magnetic eddy current damper as described in any of the above items on the vibration object to be suppressed; the upper end of the rocker arm is connected to the first mounting base, the second end of the frequency-modulated spring is connected to the second mounting base, and the rack of the magnetic eddy current damping device is connected to the vibration object to be suppressed; when the first magnetic component and the second magnetic component of the magnetic eddy current damping device rotate relative to each other, the stator assembly generates a damping torque on the rotor assembly through non-contact magnetic force, thereby suppressing the vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or other advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein:

[0021] Figure 1 A schematic diagram of a frequency modulated mass magnetic eddy current damper according to an embodiment of the present invention;

[0022] Figure 2 It is a front schematic diagram of a magnetic eddy current damping device according to an embodiment of the present invention;

[0023] Figure 3 A schematic cross-sectional view of a magnetic eddy current damping device according to an embodiment of the present invention;

[0024] Figure 4 A partial schematic diagram of a magnetic eddy current damping device according to an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of a rack positioning device according to an embodiment of the present invention;

[0026] Figure 6 A rear view schematic diagram of a rack positioning device according to an embodiment of the present invention;

[0027] Figure 7 It is a schematic top view of a frequency modulated mass magnetic eddy current damper according to a first embodiment of the present invention;

[0028] Figure 8 A schematic top view of a frequency modulated mass magnetic eddy current damper according to a second embodiment of the present invention;

[0029] Fig. 9A schematic diagram of the connection of the first end of a rack according to an embodiment of the present invention;

[0030] Fig.10 This is a schematic diagram of the connection of the second end portion of a rack according to an embodiment of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 1. pendulum, 2. counterweight, 3. frequency-modulating spring, 31. spherical bearing, 32. spring connecting plate, 4. magnetic eddy current damping device, 41. counterweight connecting rod, 42. support frame, 43. seat bearing, 44. rack positioning device, 441. roller support frame, 442. first roller, 443. pin, 444. elastic retaining ring, 445. washer, 447. connecting shaft, 448. second roller, 45. rack, 451. positioning groove, 46. stator assembly, 461. first stator back plate, 462. Second stator back plate, 463, conductor disk, 464, positioning spacer sleeve, 465, back plate spacer sleeve, 47, rotor assembly, 471, magnetic steel mounting base plate, 472, permanent magnet, 473, bearing, 474, rotating shaft, 475, locking nut, 48, gear, 5, first rack end connecting device, 51, first base plate, 52, first ear plate, 53, ball head, 54, first transfer rod, 6, second rack end connecting device, 61, second base plate, 62, second ear plate, 63, intermediate connecting piece, 64, third ear plate. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of a magnetic eddy current damping device, a tuned mass magnetic eddy current damper, and a method of suppressing vibration according to the present invention will be described with reference to the accompanying drawings.

[0034] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are illustrative and exemplary, and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0035] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0036] Figure 2 , Figure 3 and Figure 4A magnetic eddy current damping device 4 according to an embodiment of the present invention is shown, which comprises: a support frame 42, a stator assembly 46, a rotor assembly 47 and a gear rack mechanism;

[0037] The stator assembly 46 is provided with a first magnetic component, and the stator assembly 46 is fixedly connected to the support frame 42; the rotor assembly 47 is provided with a second magnetic component, and the rotor assembly 47 is rotatably mounted on the support frame 42 through a rotating shaft 474, and a gear 48 is mounted on the end of the rotating shaft 474; the rack 45 is meshedly connected with the gear 48, and when the rack makes a linear motion, the rack drives the gear and the second magnetic component connected thereto to rotate;

[0038] The first magnetic component is a disk-shaped or cylindrical part made of a conductor, and the second magnetic component is a permanent magnet; or, the first magnetic component is a permanent magnet, and the second magnetic component is a disk-shaped or cylindrical part made of a conductor; when the first magnetic component and the second magnetic component rotate relative to each other, the stator assembly 46 generates a damping torque on the rotor assembly 47 through non-contact magnetic force, thereby changing the vibration frequency of the system and reducing the amplitude.

[0039] The magnetic eddy current damping device 4 of the above embodiment adopts the permanent magnetic eddy current braking principle, so that the stator assembly and the rotor assembly can produce a braking effect in a non-contact state, and there is no friction, no wear, no need for lubrication maintenance and transmission medium between them, which greatly extends the service life of the product. The above embodiment innovatively uses the cooperation of gear racks to realize the rotation of the rotor assembly and the second magnetic component.

[0040] In a preferred embodiment of the eddy current damping device, Figure 3 As shown, the stator assembly 46 includes a first stator back plate 461, a second stator back plate 462, a back plate spacer 465 and a conductor disc 463. The first stator back plate 461 and the second stator back plate 462 are spaced and connected by the back plate spacer 465, and the conductor disc 463 is respectively arranged on the inner side of the first stator back plate 461 and the second stator back plate 462. The two stator back plates are arranged by the back plate spacer, which can make fuller use of the limited space and provide greater damping force compared with the structure of a single stator back plate. Figure 3 Also shown is a positioning spacer sleeve 464 , which is connected between the second stator back plate 462 and the support frame 42 , and is used to adjust the distance between the second stator back plate 462 and the support frame 42 .

[0041] In a preferred embodiment of the eddy current damping device, Figure 3As shown, the rotor assembly 47 includes a magnetic steel mounting substrate 471, a magnetic steel pressure plate and a permanent magnet 472. The magnetic steel mounting substrate 471 is provided with a magnetic steel mounting groove, and the permanent magnet 472 is installed in the magnetic steel mounting groove. The magnetic steel mounting substrate 471 is connected to the rotating shaft 474; the magnetic steel pressure plate is connected to the magnetic steel mounting substrate 471 and covers the magnetic steel mounting groove. The magnetic steel mounting substrate is fixed to the first end of the rotating shaft 474 and is fixed and locked by a locking nut 475. A seat bearing 43 is provided on the first side of the support frame 42, and the second end of the rotating shaft is installed in the seat bearing 43. The permanent magnet 472 is installed in the magnetic steel mounting groove and fixed by the magnetic steel pressure plate to prevent the permanent magnet 472 from shifting or being thrown out during the rotation of the rotor.

[0042] In a preferred embodiment of the eddy current damping device, Figure 3 As shown, the outer ring of the bearing 473 is installed on the second stator back plate 462, and the inner ring of the bearing 473 matching the outer ring of the bearing 473 is installed on the magnetic steel mounting base plate 471. By utilizing the above structural innovation, when maintaining the stator assembly and part of the rotor assembly, the above structure can be completely disassembled by removing the connecting bolts connecting the second stator back plate and the positioning spacer sleeve, which is convenient for maintenance and replacement.

[0043] The support frame 42 is provided with a structure for the rack to pass through, but since the support frame and the rack will move relative to each other, it is necessary to ensure that the rack and the gear are well engaged, and at the same time, the friction between the rack and other components should be reduced, the noise should be reduced and the life of the corresponding components should be increased.

[0044] In a preferred embodiment of the magnetic eddy current damping device, a positioning groove 451 is provided through the rack 45, and the cross section of the positioning groove 451 is a rectangular structure, including a groove front surface, a groove top surface and a groove bottom surface; a rack positioning device 44 is installed on the support frame 42, Figure 5 and Figure 6 The rack positioning device of an embodiment is shown; the rack positioning device 44 includes a roller support frame 441, a first roller 442 and a second roller 448. One side of the roller support frame 441 is vertically connected to two ear plates. The first roller 442 is hinged between the ear plates through a pin 443. An elastic retaining ring 444 is installed at the end of the pin for limiting. Washers 445 are preferably provided on both sides of the first roller 442 to reduce friction. The first roller 442 is in contact with the front of the groove; the second roller 448 is installed on the roller support frame 441 through a connecting shaft 447. The second roller 448 is in contact with the top surface or the bottom surface of the groove. With the above innovation, when the support frame and the rack rotate relative to each other, the movement is limited to the direction parallel to the rack, avoiding damage to the rack and gear caused by the shaking of the rack.

[0045] Although the gear rack in the above technical solution can be replaced by toothed belts, sprockets and other structures. Compared with gear racks, toothed belts are more susceptible to fatigue load corrosion, resulting in crack relaxation or even disconnection, and are more suitable for products with small temperature differences, low light intensity, and a design life of less than 5 years; while the sprocket generates a lot of noise during operation, causing noise pollution, and has high installation and maintenance requirements. In addition, since the toothed belt itself reciprocates between the two wheels and uses rotation to achieve the rotation of the wheels, its structure is more complicated.

[0046] Figure 1 The frequency-modulated mass magnetic eddy current damper of an embodiment of the present invention is shown, which comprises: a swing rod 1, a counterweight 2, a frequency-modulated spring 3 and a magnetic eddy current damping device 4. The counterweight 2 is fixedly connected to the lower end of the swing rod 1, the first end of the frequency-modulated spring 3 is connected to the lower part of the counterweight 2, the magnetic eddy current damping device is the magnetic eddy current damping device of the above embodiment, and the support frame 42 of the magnetic eddy current damping device is connected to the lower part of the counterweight 2. Figure 1 The figure also shows a joint bearing 31 and a spring connecting plate 32 . The spring connecting plates 32 are respectively fixed at both ends of the frequency modulation spring 3 , and the joint bearing 31 is connected via the spring connecting plates 32 .

[0047] The vibration suppression method implemented by the above embodiment includes the following steps: a first mounting base and a second mounting base are set on the vibration object to be suppressed, and the first mounting base is located above the second mounting base; the above frequency modulation mass magnetic eddy current damper is installed on the vibration object to be suppressed; the upper end of the swing rod 1 is connected to the first mounting base, the second end of the frequency modulation spring 3 is connected to the second mounting base, and the rack 45 of the magnetic eddy current damping device is connected to the vibration object to be suppressed; when the first magnetic component and the second magnetic component of the magnetic eddy current damping device rotate relative to each other, the stator assembly 46 generates a damping torque on the rotor assembly 47 through non-contact magnetic force, thereby achieving vibration suppression. The stator assembly and the rotor assembly can produce a braking effect in a non-contact state, and there is no friction, no wear, no lubrication maintenance and no transmission medium between them, which greatly extends the service life of the product.

[0048] In order to balance the movement of the pendulum in different directions, the frequency-modulated mass magnetic eddy current damper is provided with two or more magnetic eddy current damping devices. In a preferred embodiment, Figure 8 As shown, there are two magnetic eddy current damping devices, and the first magnetic eddy current damping device and the second magnetic eddy current damping device are arranged perpendicular to each other. In another preferred embodiment, as Figure 7 As shown, the number of magnetic eddy current damping devices is three, and the angle between two adjacent magnetic eddy current damping devices is 120 degrees. If the number of magnetic eddy current damping devices is more, they are evenly spaced.

[0049] The frequency-modulated mass eddy current damper of the embodiment is preferably used in technical fields such as high-rise buildings, bridges, high towers (such as chimneys, transmission towers), wind turbines, nuclear power, etc.

[0050] A wind power generation system, wherein at least a first platform and a second platform are arranged in a tower of the wind power generation system, wherein the first platform is located above the second platform; a frequency modulation mass magnetic eddy current damper of the above embodiment is installed in the tower, wherein the upper end of a swing rod 1 is connected to the first platform, the second end of a frequency modulation spring 3 is connected to the second platform, and a rack 45 of the magnetic eddy current damper device is connected to the inner wall of the tower. Due to the arrangement of the frequency modulation mass magnetic eddy current damper, the wind power generation system improves the stability of the tower and the service life of the equipment when the power generation equipment is running.

[0051] In another preferred embodiment, Figure 7 As shown, there are three magnetic eddy current damping devices, and the angle between two adjacent magnetic eddy current damping devices is 120 degrees.

[0052] Since the installation space in the tower is small, if different magnetic eddy current damping devices are arranged at the same height in the vertical direction, there will be a problem of mutual interference. Therefore, in a preferred embodiment, different magnetic eddy current damping devices are arranged at different heights in the vertical direction.

[0053] In the above-mentioned wind power generation system, the magnetic eddy current damping device has the problem of self-swinging and shaking. If the magnetic eddy current damping device is installed by tightening and locking, the force of its swinging and shaking cannot be released, which will cause damage to the equipment. Different from conventional technical problems, the inventors found that the magnetic eddy current damping device connected to the counterweight block will deflect in the vertical direction, causing damage to the equipment; Figure 1 , Fig. 9 and Fig.10 As shown, the rack 45 of the magnetic eddy current damping device is connected to the inner wall of the tower through the first rack end connection device 5. The first rack end connection device 5 includes a first base plate 51, a first ear plate 52, a ball head 53 and a first transfer rod 54. The first base plate 51 is fixedly connected to the inner wall of the tower by bolts or welding. Two first ear plates 52 are fixed on the first base plate 51 at intervals. The ball head 53 is fixed between the two first ear plates 52. The ball sleeve at the end of the first transfer rod 54 is inserted into the ball head, and the other end of the first transfer rod is connected to the rack. Through the above connection method, the rack can rotate in the first plane where the first ear plate is located, and can move in a small range in the direction perpendicular to the first plane through the cooperation of the ball head 53 and the first transfer rod 54, thereby avoiding damage to the device caused by the deflection of the magnetic eddy current damping device in the vertical direction.

[0054] The support frame 42 of the magnetic eddy current damping device is connected to the counterweight connecting rod 41, and the end of the counterweight connecting rod 41 is connected to the lower part of the counterweight 2 through the second rack end connecting device 6. The second rack end connecting device 6 includes a second base plate 61, a second ear plate 62, an intermediate connecting member 63 and a third ear plate 64. The second base plate 61 is fixedly connected to the counterweight, two second ear plates 62 are fixed at intervals on the second base plate 61, and two third ear plates 64 are fixed at intervals at the end of the counterweight connecting rod 41. The intermediate connecting member 63 is composed of two connecting plates vertically connected to each other, and both the connecting plate and the ear plate are provided with hinge holes. The second ear plate 62 is connected to the intermediate connecting member 63, and the third ear plate 64 is connected to the intermediate connecting member 63 by a hinge shaft.

[0055] Through the design of the first rack end connecting device and the second rack end connecting device, the needs of the eddy current damping device to rotate in the plane where the ear plate is located and to move in the vertical direction can be met, and damage to the device caused by deflection of the eddy current damping device in the vertical direction can be avoided.

[0056] A building structure, wherein the frequency-tuned mass magnetic eddy current damper of the above embodiment is installed inside the building structure, the upper end of the swing rod 1 is connected to the upper platform in the building structure, the second end of the frequency-tuned spring 3 is connected to the lower platform in the building structure, and the rack 45 of the magnetic eddy current damping device is connected to the building structure. Due to the arrangement of the frequency-tuned mass magnetic eddy current damper, the safety of the building structure is improved.

[0057] The technical features disclosed above are not limited to the disclosed combinations with other features. Those skilled in the art may also make other combinations between the technical features according to the purpose of the invention to achieve the purpose of the invention.

Claims

1. A frequency modulated mass magnetic eddy current damper, characterized in that: include: A swing rod (1), a counterweight (2), a frequency-modulating spring (3) and a magnetic eddy current damping device, wherein the counterweight (2) is fixedly connected to the lower end of the swing rod (1), the first end of the frequency-modulating spring (3) is connected to the lower part of the counterweight (2), and the supporting frame (42) of the magnetic eddy current damping device is connected to the lower part of the counterweight (2); The magnetic eddy current damping device comprises: a support frame (42), a stator assembly (46), a rotor assembly (47) and a gear rack mechanism; The stator assembly (46) is provided with a first magnetic component, and the stator assembly (46) is fixedly connected to the support frame (42); the rotor assembly (47) is provided with a second magnetic component, and the rotor assembly (47) is rotatably mounted on the support frame (42) via a rotating shaft (474), and a gear (48) is mounted at the end of the rotating shaft (474); the first magnetic component is a disc-shaped or cylindrical part made of a conductor, and the second magnetic component is a disc-shaped or cylindrical part on which permanent magnets are arranged and mounted; or, the first magnetic component is a disc-shaped or cylindrical part on which permanent magnets are arranged and mounted, and the second magnetic component is a disc-shaped or cylindrical part made of a conductor; the rack (45) of the rack and pinion mechanism is meshedly connected with the gear (48), and when the rack moves linearly, the rack drives the gear and the second magnetic component connected thereto to rotate; when the first magnetic component and the second magnetic component rotate relative to each other, the stator assembly (46) generates a damping torque on the rotor assembly (47) through a non-contact magnetic force, thereby changing the vibration frequency of the system and reducing the amplitude; The number of the magnetic eddy current damping devices is more than two; The stator assembly (46) comprises a first stator back plate (461), a second stator back plate (462), a back plate spacer sleeve (465) and a conductor disc (463); the first stator back plate (461) and the second stator back plate (462) are spaced and connected by the back plate spacer sleeve (465); and the conductor disc (463) is respectively arranged on the inner side of the first stator back plate (461) and the second stator back plate (462); A positioning groove (451) is provided through the rack (45), and the cross section of the positioning groove (451) is a rectangular structure, including a groove front surface, a groove top surface and a groove bottom surface; a rack positioning device (44) is installed on the support frame (42), and the rack positioning device (44) includes a roller support frame (441), a first roller (442) and a second roller (448), the first roller (442) is installed on the roller support frame (441) through a pin shaft (443), and the first roller (442) is in contact with the groove front surface; the second roller (448) is installed on the roller support frame (441) through a connecting shaft (447), and the number of the second rollers (448) is two, which are in contact with the groove top surface and the groove bottom surface respectively.

2. The frequency modulated mass magnetic eddy current damper according to claim 1, characterized in that: The rotor assembly (47) comprises a magnetic steel mounting substrate (471), a magnetic steel pressure plate and a permanent magnet (472); the magnetic steel mounting substrate (471) is provided with a magnetic steel mounting groove, the permanent magnet (472) is mounted in the magnetic steel mounting groove, and the magnetic steel mounting substrate (471) is connected to the rotating shaft (474); the magnetic steel pressure plate is connected to the magnetic steel mounting substrate (471) and covers the magnetic steel mounting groove.

3. The frequency modulated mass magnetic eddy current damper according to claim 2, characterized in that: The outer ring of the bearing (473) is installed on the second stator back plate (462), and the inner ring of the bearing (473) matching with the outer ring of the bearing (473) is installed on the magnetic steel mounting base plate (471).

4. The frequency modulated mass magnetic eddy current damper according to claim 1, characterized in that: The number of the magnetic eddy current damping devices is three, and the angle between two adjacent magnetic eddy current damping devices is 120 degrees.

5. The frequency modulated mass magnetic eddy current damper according to claim 4, characterized in that: Different magnetic eddy current damping devices are arranged at the same height position or at different height positions in the vertical direction.

6. A wind power generation system, characterized in that: At least a first platform and a second platform are arranged in the tower of the wind power generation system, and the first platform is located above the second platform; the frequency-modulated mass magnetic eddy current damper according to any one of claims 1 to 5 is installed in the tower, the upper end of the rocker arm (1) is connected to the first platform, the second end of the frequency-modulated spring (3) is connected to the second platform, and the rack (45) of the magnetic eddy current damping device is connected to the inner wall of the tower.

7. A building structure, characterized in that: The frequency-modulated mass magnetic eddy current damper according to any one of claims 1 to 5 is installed inside the building structure, the upper end of the pendulum rod (1) is connected to the upper platform in the building structure, the second end of the frequency-modulated spring (3) is connected to the lower platform in the building structure, and the rack (45) of the magnetic eddy current damping device is connected to the building structure.

8. A method for suppressing vibration, characterized in that: The following steps are involved: A first mounting base and a second mounting base are arranged on the vibration object to be suppressed, and the first mounting base is located above the second mounting base; the frequency-modulated mass magnetic eddy current damper described in any one of claims 1 to 5 is installed on the vibration object to be suppressed; the upper end of the rocker arm (1) is connected to the first mounting base, the second end of the frequency-modulated spring (3) is connected to the second mounting base, and the rack (45) of the magnetic eddy current damping device is connected to the vibration object to be suppressed; when the first magnetic component and the second magnetic component of the magnetic eddy current damping device rotate relative to each other, the stator assembly (46) generates a damping torque on the rotor assembly (47) through non-contact magnetic force, thereby achieving vibration suppression.

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