CN111042370B - Semi-active negative stiffness multidimensional vibration damper - Google Patents
Semi-active negative stiffness multidimensional vibration damper Download PDFInfo
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- CN111042370B CN111042370B CN201911376039.2A CN201911376039A CN111042370B CN 111042370 B CN111042370 B CN 111042370B CN 201911376039 A CN201911376039 A CN 201911376039A CN 111042370 B CN111042370 B CN 111042370B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/023—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising rolling elements, e.g. balls, pins
Abstract
The invention discloses a semi-active negative stiffness multi-dimensional vibration damping device which comprises an outer box body, wherein a tuned liquid damper, a negative stiffness mechanism and a magnetostrictive vibration power generation unit are arranged in the outer box body. The tuning liquid damper is a cylinder filled with damping liquid, the side surface of the cylinder is connected with the vibration absorption layer through a plurality of springs with one ends connected with rolling balls, the cylinder is placed on a plurality of metal balls, and the metal balls are placed above the drum-shaped body. The drum-shaped body and the negative rigidity adjusting units radially arranged on the periphery of the drum-shaped body form a negative rigidity mechanism, the bottom of the outer box body is provided with the giant magnetostrictive body, the giant magnetostrictive body is connected with the drum-shaped body through a disc spring, and the periphery of the giant magnetostrictive body is provided with induction coils and permanent magnets from inside to outside to form a magnetostrictive vibration power generation unit. And an acceleration sensor is arranged at the bottom of the drum body and is connected with the magnetostrictive vibration power generation unit, the electric energy storage and extraction unit, the controller and the excitation coil in series to form a closed loop.
Description
Technical Field
The invention belongs to the field of vibration control of civil engineering, and particularly relates to a semi-active negative stiffness multi-dimensional vibration damping device which is mainly used for controlling vibration response of a large-span structure, a long cantilever and a high-rise structure.
Background
According to the regulations in the 'building earthquake design standards' of China, vertical earthquake action should be considered for large-span and long-cantilever structures with earthquake fortification intensity of 8 and 9 degrees and high-rise buildings with earthquake fortification intensity of 9 degrees. The vibration damping control technology is to mount some energy consuming device at a specific part of the structure to achieve the purpose of vibration damping, and can be divided into passive control, active control and semi-active control according to whether external energy is input. The semi-active control is to sense the structural vibration response information by using smart materials, and to change the structural parameters in real time by driving the materials to adapt to the rigidity or damping, so as to realize dynamic control, and have better flexibility and control effect.
The application of the intelligent material in the structure control becomes the leading-edge field of the vibration control research, and the intelligent material has wide application prospect in the structure semi-active control. The Giant Magnetostrictive Material (GMM) is a novel intelligent material, has the advantages of large magnetostrictive strain and thrust, high energy conversion efficiency, high response speed and the like, and has a bidirectional reversible transduction effect between mechanical energy and electromagnetic energy. Mechanical energy can be converted into electromagnetic energy by utilizing the characteristic that the magnetostrictive reverse effect is generated after the mechanical energy is stressed; meanwhile, when the magnetic field around the GMM material changes, the length of the GMM material can change greatly, and the rigidity can be adjusted by utilizing the characteristic. The negative stiffness damping device is a new vibration isolation and damping system developed in recent years, and has a good effect on inhibiting low-frequency vibration, but at present, the semi-active control type vibration damping device with variable negative stiffness is rarely researched.
Disclosure of Invention
The invention aims to provide a semi-active negative-stiffness multi-dimensional vibration damping device, aiming at reducing horizontal and vertical vibration and torsional response of a large-span structure, a long cantilever and a high-rise structure under the excitation action of environmental loads and achieving the purposes of energy consumption and vibration damping.
In order to achieve the purpose, the invention adopts the following technical scheme:
a semi-active negative stiffness multi-dimensional vibration damping device comprises an outer box body, wherein a tuned liquid damper, a negative stiffness mechanism and a magnetostrictive vibration power generation unit are arranged inside the outer box body. The tuned liquid damper is a cylinder filled with damping liquid, the side face of the cylinder is connected with the vibration absorption layer on the inner side of the outer box body through a plurality of springs with rolling balls connected at one end, the cylinder is placed on a plurality of metal balls, and the metal balls are placed in a spherical groove above a drum-shaped body. The drum-shaped body and the negative stiffness adjusting unit radially arranged on the periphery of the drum-shaped body form a negative stiffness mechanism, the negative stiffness adjusting unit comprises a giant magnetostrictive rod, a pre-pressing spring, a linear bearing and an outer ring magnet exciting coil, one end of the giant magnetostrictive rod is kept in a pressing state through the pre-pressing spring, and the other end of the giant magnetostrictive rod is provided with a roller which is attached to the outer surface of the drum-shaped body and rolls. The bottom in the outer box body is provided with a giant magnetostrictive body which is connected with the drum-shaped body through a disc spring, and the periphery of the giant magnetostrictive body is provided with an induction coil and a permanent magnet from inside to outside to form a magnetostrictive vibration power generation unit. And an acceleration sensor is arranged at the bottom of the drum-shaped body and is connected with the magnetostrictive vibration power generation unit, the electric energy storage and extraction unit, the controller and the excitation coil in series to form a closed loop.
Furthermore, the outer box body and the cylinder are both cylindrical metal tubular structures and are coaxially mounted.
Furthermore, the inside of the cylinder is filled with damping liquid with a certain height, a plurality of damping nets are vertically arranged on the periphery of the inner ring of the cylinder, and the damping ratio of the tuned liquid damper can be adjusted by adjusting the height of the damping liquid and the mesh size of the damping nets.
Furthermore, the springs are radially and uniformly distributed between the outer box body and the cylinder, and the number of the springs is determined according to actual needs and is not less than 4. The spring is made of shape memory alloy material and has good self-resetting performance.
Furthermore, a retainer is arranged between the spring and the rolling ball and between the giant magnetostrictive rod and the roller, and lubricating oil is coated on a contact gap between the spring and the rolling ball and between the giant magnetostrictive rod and the roller. Furthermore, lubricating oil is coated on the part of the cylinder, which is in contact with the metal ball.
Furthermore, the vibration absorption layer is made of a porous material embedded in a shape memory alloy framework and has good energy absorption and self-resetting performances; the surface of the vibration absorbing layer is smoothened, so that the rolling ball can roll freely on the surface of the vibration absorbing layer.
Furthermore, the drum-shaped body is a metal solid body with an arc-shaped surface and has larger mass.
Furthermore, the negative stiffness adjusting units are fixed on the inner wall of the outer box body and radially surround the drum-shaped body, and the number of the negative stiffness adjusting units is not less than 2.
Furthermore, excitation coil install on excitation coil skeleton, the coaxial level setting of super magnetic drive telescopic link and pre-compaction spring place in excitation coil skeleton, be equipped with linear bearing between the super magnetic drive telescopic link that nests each other and can relative motion and excitation coil skeleton.
Furthermore, the disc spring adopts a superposition combination mode, so that the deformation energy of unit volume is large, and the disc spring has good buffering and shock absorption capacity; the disc spring is initially in a pre-compressed state, so that the negative stiffness adjustment unit is located in the middle of the drum-shaped body.
Furthermore, magnetizers are arranged at the top and the bottom of the giant magnetostriction body, and magnetic yokes are arranged around the induction coil, so that magnetic leakage is prevented, and energy conversion efficiency is improved. Furthermore, the magnetizer and the magnetic yoke are made of electrical pure iron materials with low magnetic resistance.
Furthermore, the permanent magnet can be made of rare earth permanent magnet materials, samarium cobalt, ferrite permanent magnet materials and the like, or a pre-magnetizing coil is selected, so that the strength of the magnetic field can be adjusted as required.
Furthermore, the distance between the giant magnetostrictive body and the peripheral induction coil and the peripheral permanent magnet is kept to be not too far, so that the magnetostrictive vibration power generation unit can work normally.
Specifically, the working principle of the present invention is as follows:
the damping device is fixed on the top of the large-span structure, the long cantilever and the high-rise structure. When the building structure vibrates in any horizontal direction, the cylinder filled with damping fluid can move on the metal ball in any direction to cause the deformation of the shape memory alloy spring and compress the vibration absorbing layer on the inner side of the outer box body, thereby realizing the energy consumption in all horizontal directions. The cylinder can freely rotate on the metal ball, so that damping liquid in the cylinder passes through the damping net to play a role in controlling the torsion of the structure. When the building structure vibrates vertically, the roller and the drum-shaped body roll under pressure, and the disc spring is lengthened or compressed to consume energy; meanwhile, the magnetic flux density inside the giant magnetostrictive body changes under the action of the vibration force, and the permanent magnet provides a pre-magnetization magnetic field for the giant magnetostrictive body, so that current is generated in the induction coil, the process of converting external vibration input into electric energy output is realized, and the process of converting mechanical energy of vertical vibration of the structure into electromagnetic energy consumption is also realized.
When the structure vibrates vertically, the acceleration sensor receives signals and transmits the signals to the controller, and the controller controls the electric energy storage and extraction unit to discharge and adjusts the current in the magnet exciting coil in real time according to the vibration strength of the structure. After the excitation coil is electrified, the magnetic field intensity around the giant magnetostrictive rod is changed, and the length of the giant magnetostrictive rod is changed, so that the pressure of the roller on the drum body is changed in real time, and the semi-active adjustment of the vertical negative stiffness is realized.
The invention has the beneficial effects that:
(1) the invention realizes the multidimensional control of the structural vibration, can control the vibration of the structure in the horizontal universal direction and the vibration and torsion of the structure in the vertical direction, and is widely applied to the vibration control of various building structures (particularly large-span structures, long cantilevers and high-rise structures).
(2) The invention combines the semi-active control technology and the negative stiffness theory, and utilizes the giant magnetostrictive material with instantaneous stretching characteristic under the action of a changing magnetic field to realize the intelligent adjustment of vertical negative stiffness, so that the damping device can work in a wider vibration frequency range.
(3) The invention does not need external energy input, and realizes self power supply. The power is generated through the bidirectional reversible transduction effect of the giant magnetostrictive material, collected and used for semi-active control of the vibration damper.
(4) The invention uses various novel materials, the vibration absorption layer is made of the shape memory alloy framework embedded with porous materials, and the vibration absorption layer has good energy absorption and self-resetting performances; the GMM material has high energy density (more than 10 times of that of piezoelectric ceramics), high response speed (microsecond level), and good safety and reliability.
(5) The invention has simple structure, high flexibility, convenient maintenance and better social and economic benefits.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a front view of a semi-active negative stiffness multi-dimensional damping device;
FIG. 2 is a sectional view taken along the line A-A of a semi-active negative-stiffness multi-dimensional vibration damping device;
FIG. 3 is a sectional view taken along line B-B of a semi-active negative stiffness multi-dimensional damping device;
FIG. 4 is a C-C sectional view of a semi-active negative stiffness multi-dimensional damping device;
FIGS. 5(a) and 5(b) are detail construction diagrams of a negative stiffness adjusting unit of a semi-active negative stiffness multi-dimensional damping device;
in the figure: the device comprises a box body 1, a cylinder 2, a drum 3, a vibration absorption layer 4, metal balls 5, spherical grooves 6, a negative stiffness adjusting unit 7, a prepressing spring 7-1, a giant magnetostrictive rod 7-2, a linear bearing 7-3, a magnet exciting coil 7-4, a magnet exciting coil skeleton 7-5, a roller retainer 7-6, rollers 7-7, a controller 8, an electric energy storage and extraction unit 9, an acceleration sensor 10, a disc spring 11, an induction coil 12, a magnet yoke 13, a permanent magnet 14, an induction coil skeleton 15, a giant magnetostrictive body 16, a magneto-conductive ball 17, damping liquid 18, a damping net 19, a rolling ball 20, a retainer 21 and a spring 22.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
As described in the background art, the prior art has few researches on vibration damping devices considering the multidimensional property of the earthquake or wind load acting direction, and has the problem of narrow working vibration frequency range. The invention provides a semi-active negative stiffness multi-dimensional vibration damping device by combining GMM materials and a negative stiffness structure model and utilizing a semi-active control technology, realizes multi-dimensional control on structural vibration, realizes energy recycling, and has good economic benefit and application prospect.
A typical embodiment of the present application is shown in fig. 1, and a semi-active negative stiffness multi-dimensional vibration damping device comprises an outer box 1, in which a tuned liquid damper, a negative stiffness mechanism and a magnetostrictive vibration power generation unit are arranged.
The tuned liquid damper is positioned at the upper part of the outer box body, the tuned liquid damper is a cylinder 2 with two closed ends, and damping liquid 18 with a certain height and a cross-shaped damping net 19 are arranged inside the cylinder 2; the damping nets 19 divide the interior of the cylinder 2 into a plurality of spaces; the outer side surface of the cylinder 2 is connected with the vibration absorption layer 4 on the inner side of the outer box body through a plurality of springs 22 one end of which is connected with a rolling ball 20, the springs 22 are uniformly distributed along the outer side surface of the cylinder in a radial shape, the number of the springs is determined according to actual needs, and is not less than 4, preferably, 8 springs are arranged in the embodiment; preferably, the spring 22 is made of a shape memory alloy material. The vibration absorbing layer 4 is made of a porous material embedded in a shape memory alloy skeleton, the surface thereof is smoothed so that the rolling ball 20 can roll freely on the surface thereof, and a rolling ball retainer 21 is provided between the rolling ball 20 and the spring 22. Preferably, the vibration absorption layer 4 is adhered to the inner side wall of the box body. The cylinder 2 is placed on a number of metal balls 5, which metal balls 5 are placed in spherical recesses 6 above the drum 3.
The drum-shaped body 3 is positioned in the middle of the outer box body, and the drum-shaped body 3 is a metal solid body with an arc-shaped surface and has larger mass. The drum-shaped body 3 and the negative rigidity adjusting units 7 radially arranged around the drum-shaped body form a negative rigidity mechanism, the negative rigidity adjusting units 7 are fixed on the inner wall of the outer box body 1 and radially surround the drum-shaped body 3, the number of the negative rigidity adjusting units is not less than 2, and preferably, 6 negative rigidity adjusting units are arranged in the embodiment.
As shown in fig. 5(a) and 5(b), the negative stiffness adjusting unit 7 includes a giant magnetostrictive rod 7-2, a pre-pressing spring 7-1, a linear bearing 7-3, an outer ring of a field coil 7-4 and a field coil skeleton 7-5, one end of the field coil skeleton 7-5 is fixed on the side wall of the outer box, and the other end is suspended; a giant magnetostrictive rod 7-2 and a pre-pressing spring 7-1 are arranged in the excitation coil framework 7-5, the giant magnetostrictive rod 7-2 and the pre-pressing spring 7-1 are coaxially and horizontally arranged, one end of the giant magnetostrictive rod 7-2 is kept in a pressing state through the pre-pressing spring 7-1, a roller 7-7 which is attached to the outer surface of the drum-shaped body 3 to roll is arranged at the other end of the giant magnetostrictive rod 7-2, and a linear bearing 7-3 is positioned between the giant magnetostrictive rod 7-2 and the excitation coil framework 7-5 which are mutually nested and can move relatively; the end part of the giant magnetostrictive rod 7-2 is welded with a roller retainer 7-6, and the roller retainer 7-6 is used for limiting the roller 7-7 to a certain extent. One end of the pre-pressing spring 7-1 is fixed on the side wall of the outer box body, and the other end is fixed at the end part of the giant magnetostrictive rod 7-2.
The giant magnetostrictive rod 7-2 is a T-shaped rod made of giant magnetostrictive material.
As shown in fig. 1, a super magnetostrictive body 16 is arranged at the inner bottom of the outer box body 1 and connected with the drum-shaped body 3 through a disc spring 11, and the disc spring 11 is in a superposition combination mode and is initially in a pre-pressing state, so that the negative stiffness adjusting unit 7 is positioned in the middle of the drum-shaped body 3.
Wherein the giant magnetostrictive body 16 is a solid cylinder made of a giant magnetostrictive material.
The periphery of the giant magnetostrictive body 16 is provided with an induction coil 12 and a permanent magnet 14 from inside to outside to form a magnetostrictive vibration power generation unit. Magnetizers 17 are arranged at the top and the bottom of the giant magnetostrictive body 16, and magnetic yokes 13 are arranged around the induction coil 12. The permanent magnet 14 can be a rare earth permanent magnet material, samarium cobalt, ferrite permanent magnet material or the like, or a pre-magnetizing coil is selected, so that the strength of a magnetic field can be adjusted as required; the magnetizer 17 and the yoke 13 are made of an electrical pure iron material with low magnetic resistance.
The bottom of the drum-shaped body 3 is also provided with an acceleration sensor 10 which is connected with a magnetostrictive vibration generating unit, an electric energy storing and extracting unit 9, a controller 8 and an excitation coil 7-4 in series to form a closed loop. In the solution of the present embodiment, the controller 8 preferably adopts the existing single chip microcomputer control.
Lubricating oil is coated on contact gaps between the rolling ball 20 and the rolling ball retainer 21 and between the roller 7-7 and the roller retainer 7-6; the cylinder 2 is coated with lubricating oil at the portion where it contacts the metal ball 5.
When the building structure vibrates in any direction horizontally, the cylinder 2 filled with the damping fluid 18 can move in any direction on the metal balls 5, causing the deformation of the springs 22 and compressing the shock-absorbing layer 4 inside the outer box, thereby achieving energy dissipation in all directions horizontally. The cylinder 2 can rotate freely on the metal ball 5, so that the damping liquid 18 in the cylinder passes through the damping net 19 to play a role in controlling the torsion of the structure. When the building structure vibrates vertically, the rollers 7-7 and the drum-shaped body 3 roll under pressure, and the disc spring 11 is lengthened or compressed to consume energy; meanwhile, the internal magnetic flux density of the giant magnetostrictive body 16 changes under the action of the vibration force, and the permanent magnet 14 provides a pre-magnetization magnetic field for the giant magnetostrictive body 16, so that current is generated in the induction coil 12, the process of converting external vibration input into electric energy output is realized, and the process of converting mechanical energy of vertical vibration of the structure into electromagnetic energy consumption is also realized.
When the structure vibrates vertically, the acceleration sensor 10 receives signals and transmits the signals to the controller 8, and the controller 8 controls the electric energy storage and extraction unit 9 to discharge electricity and adjusts the current in the magnet exciting coil 7-4 in real time according to the vibration strength of the structure. After the excitation coil 7-4 is electrified, the magnetic field intensity around the giant magnetostrictive rod 7-2 is changed, and the length of the giant magnetostrictive rod 7-2 is changed, so that the pressure of the roller 7-7 on the drum-shaped body 3 is changed in real time, and the semi-active adjustment of the vertical negative stiffness is realized.
The invention utilizes the tuned liquid damper to control the vibration and torsion of the structure in the horizontal universal direction, vertically combines the GMM material and the negative stiffness structure model, and generates power through the deformation energy consumption of the disc spring and the magnetostrictive vibration power generation unit, thereby realizing the multidimensional control of the structural vibration and having wider vibration frequency working range.
The invention generates electricity through the bidirectional reversible transduction effect of the GMM material, collects the electricity and uses the electricity and the electricity to the semi-active control of the vibration damper. The magnitude of the output current is changed in real time according to the vibration condition of the structure, the horizontal thrust action of the rod on the drum-shaped body is changed by changing the magnetic field intensity at the periphery of the giant magnetostrictive rod, the semi-active adjustment of the negative rigidity in the vertical direction is realized, and meanwhile, self-power supply is realized.
The vibration damping device is fixed at the position of the main structure of the building where the vibration damage is easy to occur, can effectively inhibit the vibration response of the building structure under the action of earthquake or wind load, and is particularly suitable for large-span structures, long cantilevers and high-rise structures. Meanwhile, the device has the advantages of simple structure, high flexibility and better social and economic benefits.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a multidimension damping device of semi-active negative stiffness which characterized in that: the tuning liquid damper comprises an outer box body, wherein a tuning liquid damper, a negative stiffness mechanism and a magnetostrictive vibration power generation unit are arranged in the outer box body;
the tuning liquid damper is a cylinder filled with damping liquid, and the side surface of the cylinder is connected with the vibration absorption layer on the inner side of the outer box body through a plurality of springs one ends of which are connected with rolling balls; the cylinder is arranged on a plurality of metal balls, and the metal balls are arranged in the spherical groove above the drum-shaped body;
the negative stiffness mechanism comprises a drum-shaped body and negative stiffness adjusting units which are positioned around the drum-shaped body and are radially arranged; the negative stiffness adjusting unit comprises a giant magnetostrictive rod, a pre-pressing spring and an excitation coil, one end of the giant magnetostrictive rod is kept in a pressing state through the pre-pressing spring, and the other end of the giant magnetostrictive rod is provided with a roller which is attached to the outer surface of the drum-shaped body and rolls; the giant magnetostrictive rod is arranged in the excitation coil;
the magnetostrictive vibration power generation unit comprises a giant magnetostrictive body, an induction coil and a permanent magnet, wherein the giant magnetostrictive body is positioned below the drum-shaped body, and the giant magnetostrictive body is connected with the drum-shaped body through a disc spring; the periphery of the giant magnetostrictive body is provided with an induction coil and a permanent magnet from inside to outside; and an acceleration sensor is arranged at the bottom of the drum-shaped body and is connected with the magnetostrictive vibration power generation unit, the electric energy storage and extraction unit, the controller and the excitation coil in series to form a closed loop.
2. The semi-active negative stiffness multi-dimensional vibration damping device according to claim 1, wherein the cylinder is filled with damping fluid at a certain height, a plurality of damping nets are vertically arranged on the inner circumference of the cylinder, and the damping ratio of the tuned fluid damper is adjusted by adjusting the height of the damping fluid and the mesh size of the damping nets.
3. A semi-active negative stiffness multi-dimensional vibration damping device as claimed in claim 1 wherein the springs are radially and evenly distributed between the outer housing and the cylinder.
4. The semi-active negative stiffness multi-dimensional vibration damping device as claimed in claim 1, wherein retainers are arranged between the spring and the rolling ball and between the giant magnetostrictive rod and the roller wheel, and lubricating oil is coated on contact gaps between the rolling ball and the rolling ball retainer and between the roller wheel and the roller wheel retainer; furthermore, lubricating oil is coated on the part of the cylinder, which is in contact with the metal ball.
5. The multi-dimensional vibration damping device with semi-active negative stiffness of claim 1, wherein the vibration absorbing layer is made of a shape memory alloy skeleton embedded with a porous material; the surface of the vibration absorbing layer is smoothened, so that the rolling ball can roll freely on the surface of the vibration absorbing layer.
6. A semi-active negative stiffness multi-dimensional vibration damping device as claimed in claim 1 wherein said drum is a solid metal body having an arcuate surface.
7. The semi-active negative stiffness multi-dimensional vibration damping device according to claim 1, wherein the excitation coil is mounted on an excitation coil frame, the super magnetostrictive rod and the pre-stressed spring are coaxially and horizontally arranged and are placed in the excitation coil frame, and a linear bearing is arranged between the super magnetostrictive rod and the excitation coil frame which are nested with each other and can relatively move.
8. The semi-active negative stiffness multi-dimensional vibration damping device according to claim 1, wherein the disc springs are stacked and combined, and the disc springs are initially in a pre-compressed state, so that the negative stiffness adjustment unit is located at the middle position of the drum-shaped body.
9. The multi-dimensional vibration damping device with semi-active negative stiffness according to claim 1, wherein the magnetostrictive body has magnetizers at the top and bottom and yokes at the periphery of the induction coil.
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| CN111255105B (en) * | 2020-01-19 | 2021-04-27 | 山东大学 | Multidimensional electromagnetic intelligent vibration damper |
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