CN110513419B - Adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design - Google Patents
Adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design Download PDFInfo
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- CN110513419B CN110513419B CN201910898086.7A CN201910898086A CN110513419B CN 110513419 B CN110513419 B CN 110513419B CN 201910898086 A CN201910898086 A CN 201910898086A CN 110513419 B CN110513419 B CN 110513419B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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Abstract
The invention discloses an adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design, which relates to the field of vibration control. The device connects the adjustable magnetic negative stiffness mechanism and the positive stiffness elastic element in parallel, realizes low natural frequency under the condition of ensuring large bearing capacity, improves the vibration isolation effect, and has high energy utilization rate and convenient use.
Description
Technical Field
The invention relates to the field of vibration control, in particular to an adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design.
Background
Conventional linear vibration isolators using linear stiffness elements, such as coil springs, rubber and air springs, only for frequencies above their natural frequency
The vibration isolation effect is achieved by the double external excitation, and the vibration (resonance) is amplified in a low frequency region. The inherent frequency of the vibration isolator can be reduced by reducing the rigidity of the vibration isolator, so that the vibration isolation frequency band is effectively expanded, and the vibration isolation performance is improved. However, on the one hand, reducing linear stiffness reduces the barrierThe bearing capacity of the vibration device causes excessive static deformation and instability; on the other hand, the rigidity component of the linear vibration isolator is limited by physical conditions, and the low rigidity is difficult to realize, for example, the air spring with low rigidity needs large volume. In order to solve the inherent contradiction between high vibration isolation performance and high bearing capacity, many researchers have proposed that quasi-zero stiffness, namely high static stiffness and low dynamic stiffness, is realized by parallel connection of positive stiffness and negative stiffness: the high static stiffness ensures small deformation and high bearing capacity, and the low dynamic stiffness ensures low natural frequency and high vibration isolation performance. Negative stiffness refers to the characteristic that the slope of the load versus displacement curve is negative, as opposed to the common positive stiffness. The negative stiffness is unstable, and the mechanical negative stiffness mechanism is generally formed by combining a plurality of elastic elements, connecting rods and other parts in a special mode.
However, the stiffness of most negative stiffness mechanisms at present is determined after the assembly is completed, the negative stiffness mechanisms cannot be adjusted on line, and the vibration isolators with invariable stiffness cannot cope with the situation of excitation frequency variation, so that the optimal vibration isolation performance is difficult to realize. In recent years, an actuator is added on a mechanical negative stiffness mechanism to adjust the stiffness, but the mechanical structure is large in size, the performance is influenced by materials and part processing conditions, a dead zone exists, the response is slow, and the mechanical negative stiffness mechanism is difficult to be used in engineering practice. An electromagnetic negative stiffness mechanism is proposed, which consists of an electrified coil and a permanent magnet, the stiffness can be adjusted by controlling current, but the permanent magnet can be demagnetized at high temperature and under impact, so that the coil cannot be subjected to high current to cause temperature rise, and the application scene of the vibration isolator is also limited; and the magnetic field distribution is relatively dispersed, the utilization rate is low, the magnitude of the negative stiffness is very small, the energy consumption is very high, and the magnetic field distribution is difficult to be used for low-frequency vibration isolation of large loads.
For example, an electromagnetic negative stiffness spring with an authorization publication number of CN 105927694B proposed by the university at sea, forms a negative stiffness by using a magnetic field force between a direct current coil and a permanent magnet, and can linearly adjust the magnitude of the negative stiffness by controlling a current. But the magnetic field distribution is comparatively dispersed, and the utilization rate of magnetic field energy is low.
The electromagnetic negative stiffness spring with an authorized bulletin number of CN 105587812B proposed by Harbin engineering university is characterized in that a stator is arranged outside a rotor, a coil is wound on the rotor, rectangular gear rings are arranged on the working surfaces of the rotor and the stator, the rectangular gear rings of the rotor correspond to the rectangular gear rings of the stator in position, an air gap exists between the rectangular gear rings of the rotor and the rectangular gear rings of the stator, and Maxwell tangential force between magnetic teeth forms negative stiffness.
Disclosure of Invention
In order to solve the technical problems, the invention provides the adjustable quasi-zero stiffness vibration isolator based on the magnetic circuit design, which realizes low natural frequency and improves the vibration isolation effect under the condition of ensuring large bearing capacity, and meanwhile, the vibration isolator has the advantages of large force density, high energy efficiency and convenience in use.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a zero-stiffness-adjustable vibration isolator based on magnetic circuit design, which comprises a load platform, a connecting assembly, a positive stiffness bearing module, a negative stiffness magnetic circuit module and a control system, wherein the negative stiffness magnetic circuit module comprises an external magnetic conduction shell, a movable shaft, a middle magnetic conduction ring, two end magnetic conduction shafts and a plurality of connecting magnetic conduction shafts; the movable shaft is arranged between the two end magnetic conduction shafts in the external magnetic conduction shell, the two end magnetic conduction shafts are coaxially arranged with the movable shaft, a gap is reserved between the two end magnetic conduction shafts and the upper end surface and the lower end surface of the movable shaft, and the two end magnetic conduction shafts are respectively fixed at the top end and the bottom end of the external magnetic conduction shell; the middle magnetic conductive ring is coaxially sleeved outside the movable shaft in a clearance manner, and the adjusting nut is used for adjusting the initial relative positions of the load platform and the movable shaft connected with the load platform and the middle magnetic conductive ring; two ends of each connecting magnetic conduction shaft are respectively connected with the middle magnetic conduction ring and the inner wall of the external magnetic conduction shell, a coil is respectively sleeved on each connecting magnetic conduction shaft, an acceleration sensor is fixed on the external magnetic conduction shell, and the acceleration sensor and the coil are both connected with the control system.
Preferably, the coupling assembly includes a fixing ring and a plurality of connecting rods, the fixing ring is sleeved on the upper end of the movable shaft and fixed to the movable shaft by a radial set screw, the connecting rods are parallel to the guide shaft, two ends of each connecting rod are respectively connected to the load platform and the fixing ring, and each connecting rod penetrates through the top end of the external magnetic conductive shell and can move up and down relative to the external magnetic conductive shell.
Preferably, the control system comprises a computer, an analog output module, a power supply and an analog input module, wherein the analog input module and the analog output module are respectively connected with the computer, the acceleration sensor is connected with the analog input module, the power supply is connected with the analog output module, and the coil is connected with the power supply.
Preferably, the diameters of the movable shaft and the two end magnetic conduction shafts are equal, and the axial height of the movable shaft is higher than that of the middle magnetic conduction ring.
Preferably, the middle magnetic conductive ring is perpendicular to the connecting magnetic conductive shaft, the inner ring of the coil is tightly attached to the outer ring of the connecting magnetic conductive shaft, and direct current is introduced into the coil during operation, so that the directions of the magnetic fields generated by the coils simultaneously point to or depart from the middle magnetic conductive ring.
Preferably, the magnetic conductive shaft comprises a plurality of shaft supports, and each connecting magnetic conductive shaft can be fixed on the inner wall of the outer magnetic conductive shell through one shaft support.
Preferably, the linear bearing is fixed at the center of the load platform, the guide shaft passes through the linear bearing, and the linear bearing is sleeved outside the guide shaft.
Preferably, a lower end of the guide shaft is screw-coupled to a top upper surface of the outer magnetic conductive case.
Preferably, the elastic member is a coil spring, rubber, or a plate spring.
Compared with the prior art, the invention has the following technical effects:
the adjustable quasi-zero stiffness vibration isolator based on the magnetic circuit design comprises a load platform, a connecting component, a positive stiffness bearing module, a negative stiffness magnetic circuit module and a control system, wherein the magnetic circuit design of the negative stiffness magnetic circuit module enables a magnetic field to be intensively distributed in a designed magnetic circuit, the utilization rate of the magnetic field is greatly improved, the negative stiffness can be realized by using the Maisvey normal force with smaller power, the quasi-zero stiffness can be realized in parallel connection with the larger positive stiffness, the quasi-zero stiffness vibration isolator can be further used for low-frequency vibration isolation of large loads, low inherent frequency is realized under the condition of ensuring large bearing capacity, the vibration isolation effect is improved, the energy utilization rate is high, the use is convenient, and the whole magnetic circuit system does not have permanent magnets and can be used in a high-temperature environment. The control system is arranged to control the current, so that the negative rigidity generated by the magnetic circuit can be changed, namely the natural frequency of the vibration isolator is changed, the resonance of low frequency can be avoided, and the vibration isolation effect is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic system composition diagram of the adjustable quasi-zero stiffness vibration isolator based on a magnetic circuit design provided by the invention;
fig. 2 is an axonometric view of the adjustable zero stiffness vibration isolator based on a magnetic circuit design provided by the invention.
Description of reference numerals: 1. an outer magnetically conductive shell; 2. an end portion magnetic conduction shaft; 3. a shaft support; 4. connecting the magnetic conduction shaft; 5. an intermediate magnetically conductive ring; 6. a movable shaft; 7. adjusting the nut; 8. an elastic member; 9. a linear bearing; 10. a guide shaft; 11. a load platform; 12. a connecting rod; 13. a fixing ring; 14. a coil; 15. an acceleration sensor; 16. a computer; 17. an analog output module; 18. a power source; 19. and an analog input module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an adjustable quasi-zero stiffness vibration isolator based on a magnetic circuit design, which realizes low natural frequency and improves the vibration isolation effect under the condition of ensuring large bearing capacity, and has the advantages of high force density, high energy efficiency and convenient use.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-2, the present embodiment provides a magnetic circuit design-based adjustable quasi-zero stiffness vibration isolator, which includes a load platform 11, a connection assembly, a positive stiffness load module, a negative stiffness magnetic circuit module, and a control system, where the negative stiffness magnetic circuit module includes an external magnetic conductive shell 1, a movable shaft 6, a middle magnetic conductive ring 5, two end magnetic conductive shafts 2, and a plurality of connection magnetic conductive shafts 4, and the positive stiffness load module includes a guide shaft 10, an elastic component 8, and an adjusting nut 7. The guiding axle 10 is installed on the top of outside magnetic shell 1 of leading, load platform 11, elastomeric element 8 and adjusting nut 7 from top to bottom overlap in proper order and establish and install on guiding axle 10, in this embodiment, guiding axle 10 is including the polished rod section that from top to bottom connects gradually, screw thread section and linkage segment, load platform 11 overlaps and locates on the polished rod section, load platform 11 can be along guiding axle 10 and be axial motion, adjusting nut 7 is installed on the screw thread section, guiding axle 10 leads the top upper surface of magnetic shell 1 in the outside through its lower extreme screw thread fixed connection. The elastic part 8 is pressed to the upper end of the adjusting nut 7 by the loading platform 11, the elastic part 8 is used for supporting a large load, under the condition that the load is not changed, the compression amount of the elastic part 8 is determined, and the initial position of the loading platform 11 can be adjusted by rotating the adjusting nut 7. In the absence of the negative stiffness produced by the magnetic circuit, only the positive stiffness produced by the resilient member 8, the isolator is at a high natural frequency. Specifically, the elastic member 8 is a coil spring, rubber, or a plate spring.
The load platform 11 is connected with the movable shaft 6 through the connecting assembly, and can move along the axial together with the movable shaft 6, the movable shaft 6 is arranged between the two end part magnetic conduction shafts 2 in the external magnetic conduction shell 1, the two end part magnetic conduction shafts 2 are coaxially arranged with the movable shaft 6, and a gap exists between the two end part magnetic conduction shafts 2 and the upper end surface and the lower end surface of the movable shaft 6, the two end part magnetic conduction shafts 2 are respectively fixed at the top end and the bottom end of the external magnetic conduction shell 1, and the axial gap formed between the movable shaft 6 and the two end part magnetic conduction shafts 2 is determined by the working stroke of the. The middle magnetic conductive ring 5 is sleeved outside the movable shaft 6 in a coaxial clearance manner, the radial clearance between the outer ring surface of the movable shaft 6 and the inner ring surface of the middle magnetic conductive ring 5 is small, the elastic part 8 is pressed on the adjusting nut 7, and the adjusting nut 7 can adjust the initial relative positions of the load platform 11 and the movable shaft 6 connected with the load platform and the middle magnetic conductive ring 5; two ends of each connecting magnetic conduction shaft 4 are respectively connected with the middle magnetic conduction ring 5 and the inner wall of the outer magnetic conduction shell 1, a coil 14 is respectively sleeved on each connecting magnetic conduction shaft 4, the inner ring of each coil 14 is tightly attached to the outer ring of the connecting magnetic conduction shaft 4, and direct current is introduced into each coil 14 when the coil 14 works, so that the direction of the magnetic field generated by each coil 14 simultaneously points to or deviates from the middle magnetic conduction ring 5. In the whole magnetic circuit, the coil 14 is electrified to generate magnetomotive force, the magnetomotive force enters the movable shaft 6 through the small air gap of the ring surface by connecting the magnetic conduction shafts 4 to the middle magnetic conduction ring 5, passes through the axial air gaps through the upper end surface and the lower end surface of the movable shaft 6 and respectively enters the upper end part magnetic conduction shaft 2 and the lower end part magnetic conduction shaft 2, and finally returns to the connecting magnetic conduction shafts 4 through the outer magnetic conduction shell 1 to be closed, the whole magnetic circuit is in an 8-shaped (as shown by a dotted line in fig. 1) shape at the axial section position of each connecting magnetic conduction shaft 4. In this embodiment, the part where the magnetic circuit passes through is made of materials with high magnetic permeability such as electrical pure iron except for the air gap, and the other parts are made of materials with low magnetic permeability such as 304 steel or aluminum alloy, that is, the outer magnetic conductive shell 1, the movable shaft 6, the middle magnetic conductive ring 5, the two end magnetic conductive shafts 2 and the plurality of connecting magnetic conductive shafts 4 are made of materials with high magnetic permeability such as electrical pure iron, and the other parts except the above parts are made of materials with low magnetic permeability such as 304 steel or aluminum alloy.
An acceleration sensor 15 is fixed on the external magnetic conduction shell 1, and both the acceleration sensor 15 and the coil 14 are connected with a control system. Specifically, the bottom of the external magnetically conducting shell 1 is used for mounting on a foundation, and the acceleration sensor 15 is used for collecting an acceleration signal of the vibration of the foundation.
The control system comprises a computer 16, an analog output module 17, a power supply 18 and an analog input module 19, wherein the analog input module 19 and the analog output module 17 are respectively connected with the computer 16, the acceleration sensor 15 is connected with the analog input module 19, the power supply 18 is connected with the analog output module 17, and the coil 14 is connected with the power supply 18.
Specifically, the connecting assembly includes a fixing ring 13 and a plurality of connecting rods 12, the fixing ring 13 is sleeved on the upper end of the movable shaft 6 and fixed with the movable shaft 6 by using radial set screws, the connecting rods 12 are parallel to the guide shaft 10, two ends of each connecting rod 12 are respectively connected with the load platform 11 and the fixing ring 13, and each connecting rod 12 penetrates through the top end of the external magnetic guide shell 1 and can move up and down relative to the external magnetic guide shell 1. In this embodiment, the number of the connecting rods 12 is two.
In particular, the movable shaft 6 and the two end magnetically permeable shafts 2 are of equal diameter. The axial height of the movable shaft 6 is higher than that of the middle magnetic conduction ring 5. The middle magnetic conductive ring 5 is vertical to the connecting magnetic conductive shaft 4. The embodiment also comprises a plurality of shaft supports 3, and each connecting magnetic conduction shaft 4 can be fixed on the inner wall of the outer magnetic conduction shell 1 through one shaft support 3.
In this embodiment, the external magnetic conductive shell 1 includes a cross top plate, a cross bottom plate, and four side plates, and the upper end and the lower end of each side plate are respectively fixedly connected with the cross top plate and the cross bottom plate. Two end portion magnetic conduction shafts 2 are respectively fixed at the lower end of the cross-shaped top plate and the upper end of the cross-shaped bottom plate, the acceleration sensor 15 is arranged on the cross-shaped bottom plate, and one shaft support 3 is installed on the inner wall of each side plate, namely the shaft support 3, the connection magnetic conduction shafts 4 and the coils 14 are all arranged to be four in the embodiment.
The embodiment further comprises a linear bearing 9, the linear bearing 9 is fixed at the center of the load platform 11, the guide shaft 10 penetrates through the linear bearing 9, and the linear bearing 9 is sleeved outside the guide shaft 10. The friction, i.e. the system damping rate, is reduced by the provision of the linear bearing 9.
When the vibration isolator works, the two end part magnetic conduction shafts 2 attract the movable shaft 6, the axial air gap is reduced by the attraction, and obviously, the smaller the air gap is, the larger the attraction is. That is, when the movable shaft 6 is located at the middle position of the middle magnetic conductive ring 5, the attraction force of the two end magnetic conductive shafts 2 to the movable shaft 6 is equal, and the magnetic negative stiffness is located at the equilibrium position, which is the ideal initial position of the vibration isolator system. However, once the movable shaft 6 is moved away from the equilibrium position by the generation of a slight disturbance, the movable shaft 6 continues to move away from the equilibrium position and cannot be restored without an external force. It can be seen that a negative stiffness is formed between the movable shaft 6 and the end magnetically permeable shaft 2. While the positive stiffness force of the coil spring will cause the load platform 11 to return to the equilibrium position after being deflected from the equilibrium position. The negative stiffness generated by the magnetic circuit is connected in parallel with the positive stiffness generated by the spiral spring, the force of the positive stiffness returning to the balance position and the force of the negative stiffness far away from the balance position are mutually offset, the quasi-zero stiffness can be generated, the vibration isolator is in a low natural frequency, and a good vibration isolation effect is realized. Under the initial working position without vibration, the center of the movable shaft 6 and the center of the middle magnetic conductive ring 5 are at the same height, and the adjusting nut 7 is used for conveniently adjusting the positions of the load platform 11 and the movable shaft 6 connected with the load platform under the initial state without vibration so as to enable the magnetic negative rigidity to be at a balance position, and the vibration isolator reaches an ideal initial position.
However, under the prior art conditions, the quasi-zero stiffness is still a certain distance away from the true zero stiffness, the low natural frequency is not reduced to 0, and the vibration isolator still may resonate at the low natural frequency. By controlling the current, the negative stiffness generated by the magnetic circuit can be changed, namely the natural frequency of the vibration isolator is changed, so that the low-frequency resonance can be avoided, and the vibration isolation effect is further improved. The specific implementation method comprises the following steps: the acceleration sensor 15 collects the acceleration signal of the vibration of the foundation base, the acceleration signal is converted into a digital signal through the analog input module 19 and sent to the computer 16, and the computer 16 is connected with the computerCalculating the main frequency of the external vibration by an over-frequency detection algorithm; when the main external vibration frequency is higher than the low natural frequency of the vibration isolator
When the vibration is doubled, the computer 16 outputs signals, the signals are converted into analog signals through the analog output module 17, the analog signals are finally converted into driving currents through the power supply 18 and the driving currents are transmitted to the coil 14, negative stiffness can be generated, the vibration isolator is in quasi-zero stiffness at the moment, the inherent frequency is low, and the vibration isolation effect is good; when the external excitation frequency is close to the low natural frequency of the vibration isolator, the vibration isolator can resonate, and the computer 16 outputs a signal to turn off the power supply 18 and switch to the high natural frequency of the positive stiffness vibration isolator to avoid resonance when the negative stiffness disappears.
Therefore, the adjustable quasi-zero stiffness vibration isolator based on the magnetic circuit design provided by the embodiment has the advantages that the magnetic circuit design of the negative stiffness magnetic circuit module enables the magnetic field to be intensively distributed in the designed magnetic circuit, the magnetic field distribution is excellent, the utilization rate of the magnetic field is greatly improved, the normal force of the Mais Wei is utilized, the larger negative stiffness can be realized by using smaller power, the amount of the negative stiffness generated by the high energy utilization rate is high, the quasi-zero stiffness can be realized by being connected with the larger positive stiffness in parallel, the low-frequency vibration isolation of a large load can be further realized, the low inherent frequency is realized under the condition of ensuring the large bearing capacity, the vibration isolation effect is improved, the energy efficiency is high, the use is convenient, the permanent magnet does not exist in the whole magnetic circuit system, and the. The control system is arranged to control the current, so that the negative rigidity generated by the magnetic circuit can be changed, namely the natural frequency of the vibration isolator is changed, the resonance of low frequency can be avoided, and the vibration isolation effect is further improved.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A zero-stiffness-adjustable vibration isolator based on magnetic circuit design comprises a load platform, a connecting assembly, a positive stiffness bearing module, a negative stiffness magnetic circuit module and a control system, wherein the negative stiffness magnetic circuit module comprises a movable shaft, the positive stiffness bearing module comprises a guide shaft, an elastic component and an adjusting nut, the load platform, the elastic component and the adjusting nut are sequentially sleeved and mounted on the guide shaft from top to bottom, the adjusting nut is in threaded connection with the guide shaft, the load platform is connected with the movable shaft through the connecting assembly and can axially move together with the movable shaft, and the zero-stiffness-adjustable vibration isolator is characterized in that the negative stiffness magnetic circuit module further comprises an external magnetic conduction shell, a middle magnetic conduction ring, two end magnetic conduction shafts and a plurality of connecting magnetic conduction shafts, the guide shaft is mounted at the top end of the external magnetic conduction shell, and the movable shaft is arranged between the two end magnetic conduction shafts in the external magnetic conduction shell, the two end magnetic conduction shafts are coaxially arranged with the movable shaft, a gap is reserved between the two end magnetic conduction shafts and the upper end surface and the lower end surface of the movable shaft, and the two end magnetic conduction shafts are respectively fixed at the top end and the bottom end of the external magnetic conduction shell; the middle magnetic conductive ring is coaxially sleeved outside the movable shaft in a clearance manner, and the adjusting nut is used for adjusting the initial relative positions of the load platform and the movable shaft connected with the load platform and the middle magnetic conductive ring; two ends of each connecting magnetic conduction shaft are respectively connected with the middle magnetic conduction ring and the inner wall of the external magnetic conduction shell, a coil is respectively sleeved on each connecting magnetic conduction shaft, an acceleration sensor is fixed on the external magnetic conduction shell, and the acceleration sensor and the coil are both connected with the control system.
2. The vibration isolator with adjustable quasi-zero stiffness based on the magnetic circuit design as claimed in claim 1, wherein the connection assembly includes a fixing ring and a plurality of connecting rods, the fixing ring is sleeved on the upper end of the movable shaft and fixed to the movable shaft by a set screw along a radial direction, the connecting rods are parallel to the guide shaft, two ends of each connecting rod are respectively connected to the load platform and the fixing ring, and each connecting rod penetrates through the top end of the outer magnetic conductive shell and can move up and down relative to the outer magnetic conductive shell.
3. The magnetic circuit design-based adjustable quasi-zero stiffness vibration isolator according to claim 1, wherein the control system comprises a computer, an analog output module, a power supply and an analog input module, the analog input module and the analog output module are respectively connected with the computer, the acceleration sensor is connected with the analog input module, the power supply is connected with the analog output module, and the coil is connected with the power supply.
4. The adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design according to claim 1, wherein the movable shaft and the two end magnetically permeable shafts are equal in diameter, and the axial height of the movable shaft is higher than that of the intermediate magnetically permeable ring.
5. The vibration isolator with adjustable quasi-zero stiffness based on the magnetic circuit design as claimed in claim 4, wherein the middle magnetic conductive ring is perpendicular to the connecting magnetic conductive shaft, the inner ring of the coil is tightly attached to the outer ring of the connecting magnetic conductive shaft, and the coil is powered by direct current during operation, so that the magnetic field generated by each coil is directed to or departed from the middle magnetic conductive ring at the same time.
6. The vibration isolator with adjustable quasi-zero stiffness based on magnetic circuit design according to claim 5, further comprising a plurality of shaft supports, wherein each connecting flux-conducting shaft can be fixed on the inner wall of the outer flux-conducting shell through one of the shaft supports.
7. The vibration isolator with adjustable quasi-zero stiffness based on magnetic circuit design according to claim 1, further comprising a linear bearing fixed at the center of the load platform, wherein the guide shaft passes through the linear bearing, and the linear bearing is sleeved outside the guide shaft.
8. The adjustable quasi-zero stiffness vibration isolator based on magnetic circuit design according to claim 1, wherein the lower end of the guide shaft is screwed to the top upper surface of the outer magnetic guide shell.
9. The adjustable quasi-zero stiffness vibration isolator based on a magnetic circuit design according to claim 1, wherein the elastic member is a coil spring, rubber or leaf spring.
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| CN112696454B (en) * | 2020-12-28 | 2021-10-08 | 哈尔滨工程大学 | Magnetic suspension type quasi-zero stiffness electromagnetic vibration isolator with active negative stiffness |
| CN112780724B (en) * | 2020-12-31 | 2022-02-08 | 山东大学 | Rigidity-adjustable quasi-zero rigidity torsion vibration isolator and method |
| CN113757285B (en) * | 2021-09-08 | 2022-06-21 | 重庆大学 | Negative stiffness generating mechanism and quasi-zero stiffness vibration isolator |
| CN114054554B (en) * | 2021-11-23 | 2023-05-23 | 北方工业大学 | Auxiliary system of roll bending forming equipment capable of automatically adjusting roll gap |
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| US3448951A (en) * | 1966-10-18 | 1969-06-10 | David Vaughan Watkins | Vibration isolation system |
| CN105782333A (en) * | 2016-04-22 | 2016-07-20 | 浙江大学 | Composite semi-active ultralow-frequency vibration isolating device |
| CN207762173U (en) * | 2017-12-29 | 2018-08-24 | 浙江理工大学 | A kind of sensing Nonlinear Quasi zero stiffness electromagnetism vibration isolator certainly |
| CN109681573A (en) * | 2018-12-27 | 2019-04-26 | 上海大学 | A kind of quasi-zero stiffness vibration isolators |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3448951A (en) * | 1966-10-18 | 1969-06-10 | David Vaughan Watkins | Vibration isolation system |
| CN105782333A (en) * | 2016-04-22 | 2016-07-20 | 浙江大学 | Composite semi-active ultralow-frequency vibration isolating device |
| CN207762173U (en) * | 2017-12-29 | 2018-08-24 | 浙江理工大学 | A kind of sensing Nonlinear Quasi zero stiffness electromagnetism vibration isolator certainly |
| CN109681573A (en) * | 2018-12-27 | 2019-04-26 | 上海大学 | A kind of quasi-zero stiffness vibration isolators |
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