CN104747652A - Quasi-zero stiffness vibration isolator connected with magnetic spring in parallel through spiral spring - Google Patents
Quasi-zero stiffness vibration isolator connected with magnetic spring in parallel through spiral spring Download PDFInfo
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- CN104747652A CN104747652A CN201510097824.XA CN201510097824A CN104747652A CN 104747652 A CN104747652 A CN 104747652A CN 201510097824 A CN201510097824 A CN 201510097824A CN 104747652 A CN104747652 A CN 104747652A
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- permanent magnet
- clamping device
- helical spring
- annular permanent
- spring
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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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
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Abstract
A quasi-zero stiffness vibration isolator connected with a magnetic spring in parallel through a spiral spring comprises a mass supporting rod, and one end of the mass supporting rod is fixedly connected with the spiral spring through threads; a permanent magnet clamped by the spiral spring, the spiral spring and the mass supporting rod move together relative to a spiral spring clamping mechanism in the axial direction, and meanwhile the spiral spring provides positive stiffness for a system in the axial direction; two annular permanent magnets fixed through the permanent magnet clamping mechanism apply attraction to the permanent magnet clamped by the spiral spring, the three permanent magnets form the magnetic spring, and non-linear restoration force and non-linear negative stiffness are provided for the system; the relative distances between the upper permanent magnet and the permanent magnet clamped by the spiral spring and between the lower permanent magnet and the permanent magnet clamped by the spiral spring can be adjusted by rotating the permanent magnet clamping mechanism. By means of the vibration isolator, intrinsic frequency of the vibration isolation system can be effectively reduced, and the vibration isolation frequency band is widened. Meanwhile, the damping characteristic of the structure is improved, and a reliable method is provided for low-frequency vibration control.
Description
Technical field
The present invention relates to vibration isolation technique field, be specifically related to a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring.
Background technique
Mechanical oscillatory structure phenomenon is prevalent in the middle of actual production practices.When system is subject to the excitation of extraneous vibration source, vibration will be produced.People utilize vibration to can be production practices service, as the vibration screening of industrial normal employing, and pile vibrosinking, vibrating transportation and the sensor by vibrational theory design; But in science and techniques of defence, industrial machinery and the technical field such as instrument, instrument, mechanical vibration often cause structural damage to be lost efficacy, measuring accuracy reduces, the problems such as shortening in working life.Such as, the vibration of instrument, instrument can cause its measuring accuracy to reduce; During Spacecraft Launch, impulsive load may cause structural damage inefficacy etc.
When processing nuisance vibration problem, vibration isolation technique is usually top-priority method.Compared with common active vibration isolation, semi-active vibration-isolating, passive type vibration isolation uses simple because it has, and does not need the external world to provide the energy, advantages such as good stability and being widely adopted.For the medium-high frequency oscillating component in mechanical vibration problem, full-fledged linear theory of vibration isolation and correlation method can be adopted to realize effective control, when energizing frequency is greater than vibrating isolation system undamped natural frequency of a mechanical system
times time, traditional linear vibration isolator just has vibration isolating effect, but is often difficult to effective isolation for the vibration of low band frequency range.Because the vibration isolation frequency band of general linear vibration isolator is restricted, in order to effectively control the vibration of low frequency region, non-linear low frequency theory of vibration isolation and method have had some relevant researchs.A kind of method of normal employing widens vibration isolation frequency band by the rigidity of reduction vibrating isolation system, but the rigidity reducing vibrating isolation system will cause quiet distortion to increase, and reduces the stability of system.For solving this problem, quasi-zero stiffness vibration isolators, high static state-low dynamic rate vibrating isolation system obtain the concern of many scholars.Because the performance of permanent magnet makes some progress with preparation, adopt permanent-magnet structure to design the vibrating isolation system with accurate zero stiffness characteristic and seem relatively easy; But under certain design objective, design natural frequency low, the simple and Nonlinear Vibration Isolation System that bulk is little of structure, just seem comparatively difficulty.
Summary of the invention
For overcoming prior art Problems existing, the object of the invention is to propose a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring, apparatus of the present invention have high static stiffness-low dynamic rate characteristic near its working position, can be used for low frequency vibration isolation, the operating modes such as buffering, and it is simple to have structure, easy for installation, bearing capacity is large, the feature that cost is low, effectively can reduce the natural frequency of vibrating isolation system, and then widen vibration isolation frequency band; Meanwhile, improve and be improved to the damping characteristic of structure, for low-frequency vibration controls to provide a kind of method reliably.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows:
Adopt the quasi-zero stiffness vibration isolators that helical spring is in parallel with magnet spring, comprise helical spring 7, be arranged on the first annular permanent magnet 15 in helical spring 7 central cavity, be arranged on the middle permanent magnet fixed cover 6 of helical spring 7 central cavity upper end, the threaded one end section of the quality strut 1 of the two ends section of being threaded is through the screwed hole of centre bottom the tapped hole of permanent magnet fixed cover 6, the center hole of intermediate annular permanent magnet 15 and helical spring 7 central cavity, screwed hole of centre bottom the tapped hole of described middle permanent magnet fixed cover 6 and helical spring 7 central cavity and the thread section of quality strut 1 suitable, the described center hole of the first annular permanent magnet 15 and the thread section Spielpassung of quality strut 1, without the axial not magnetic conduction linear bearing 2 being provided with about beam quality strut 1 and making it move vertically of thread section in the middle of described quality strut 1, the outer installment of magnetic conduction linear bearing 2 does not have inner and outer wall screwed upper end permanent magnet clamping device 4, upper end annular permanent magnet 16 is placed in the cavity of upper end permanent magnet clamping device 4 and formation between magnetic conduction linear bearing 2, the top open part of upper end permanent magnet clamping device 4 is provided with suitable with externally threaded upper end permanent magnet fixed cover 3 with upper end permanent magnet clamping device 4 inner thread, for fixing upper end annular permanent magnet 16, described upper end permanent magnet fixed cover 3 and not magnetic conduction linear bearing 2 are connected by the first bolt 14, and the outer end of helical spring 7 is vertically disposed with by the fixing upper end helical spring clamping device 5 of the second bolt 13 and lower end helical spring clamping device 8, upper end helical spring clamping device 5 is connected by the internal thread of its upper end boss and the outer wall thread of upper end permanent magnet clamping device 4, the boss internal thread place, lower end of lower end helical spring clamping device 8 is fixed with externally threaded lower end permanent magnet clamping device 9, place lower end annular permanent magnet 17 in lower end permanent magnet clamping device 9, permanent magnet clamping device 9 lower end, lower end is fixed with the retainingf key 10 for connecting outside vibration source by internal thread, upper end permanent magnet clamping device 4 is fixed by the 3rd bolt 12 by the upper end boss of described upper end helical spring clamping device 5, and lower end permanent magnet clamping device 9 is fixed by the 4th bolt 11 by the lower end boss of lower end helical spring clamping device 8.
Upper end annular permanent magnet 16 and lower end annular permanent magnet 17 relative position is vertically regulated by knob upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9.
By upper end permanent magnet fixed cover 3 and retainingf key 10 upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9 respectively precession different depth regulate the upper end annular permanent magnet 16 of installation and the thickness of lower end annular permanent magnet 17.
Described not magnetic conduction linear bearing 2 adopts metallic copper, and the remaining part of described vibration isolator except not magnetic conduction linear bearing 2 adopts non-magnetic metallic material.
Described upper end annular permanent magnet 16 and lower end annular permanent magnet 17 are set to 10mm with the initial mounting distance of intermediate annular permanent magnet 15.
The present invention compares with existing technology, and tool has the following advantages:
1, when loading along the axis of quality strut 1, will there is resiliently deformable in the helical spring 7 be connected with quality strut 1 vertically.The present invention is according to the characteristic of elastic element, and adopt helical spring 7 as the positive rigidity resilient support members of vibrating isolation system, helical spring has low stress and concentrates, and can produce larger displacement vertically, and take up room little feature.
2, adopt three pieces of annular permanent magnets to form the magnet spring wanted required for the present invention and provide negative stiffness for this vibrating isolation system, thus reducing the rigidity of isolation mounting near its working position, and then widening vibration isolation frequency band, realizing low frequency vibration isolation.
3, due to the introducing of permanent-magnet structure, make apparatus of the present invention have quick response, non-contact, take up room the feature such as little; The negative stiffness characteristic that the relative position between permanent magnet can be regulated desirable for system obtains near working position by turn-knob upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9.
4, the present invention adopts and upper end annular permanent magnet 16 and lower end annular permanent magnet 17 is connected with upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9 with externally threaded upper end permanent magnet fixed cover 3 and retainingf key 10.Can by upper end permanent magnet fixed cover 3 and retainingf key 10 precession different depth in upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9, namely adjustable and assemble upper end annular permanent magnet 16 and the lower end annular permanent magnet 17 of different-thickness.
5, all component of the present invention all adopt non-magnet_conductible material, avoid to permanent magnet produce magnetic field cause interference.
6, in apparatus of the present invention, all parts all can adopt non-magnetic metallic material; When the system is operating, foucault current will be produced in metal parts, the damping characteristic of apparatus of the present invention can be improved.
7, constructional device of the present invention, easy to use, with low cost, and bearing capacity is strong, has good isolation effect for low-frequency vibration.
Accompanying drawing explanation
Fig. 1 is vibration isolator assembly half sectional view of the present invention.
Fig. 2 is helical spring parts drawing.
Fig. 3 is permanent magnet clamping device parts drawing, and wherein: Fig. 3 a is upper end permanent magnet clamping device parts drawing, Fig. 3 b is lower end permanent magnet clamping device parts drawing.
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and working principle are elaborated further.
As shown in Figure 1, Figure 2 and Figure 3, a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring of the present invention, comprise helical spring 7, be arranged on the first annular permanent magnet 15 in helical spring 7 central cavity, be arranged on the permanent magnet fixed cover 6 of helical spring 7 central cavity upper end, the threaded one end section of the quality strut 1 of the two ends section of being threaded is through the screwed hole of centre bottom the tapped hole of permanent magnet fixed cover 6, the center hole of intermediate annular permanent magnet 15 and helical spring 7 central cavity, screwed hole of centre bottom the tapped hole of described middle permanent magnet fixed cover 6 and helical spring 7 central cavity and the thread section of quality strut 1 suitable, the described center hole of the first annular permanent magnet 15 and the thread section Spielpassung of quality strut 1, without the axial not magnetic conduction linear bearing 2 being provided with about beam quality strut 1 and making it move vertically of thread section in the middle of described quality strut 1, the outer installment of magnetic conduction linear bearing 2 does not have inner and outer wall screwed upper end permanent magnet clamping device 4, upper end annular permanent magnet 16 is placed in the cavity of upper end permanent magnet clamping device 4 and formation between magnetic conduction linear bearing 2, the top open part of upper end permanent magnet clamping device 4 is provided with suitable with externally threaded upper end permanent magnet fixed cover 3 with upper end permanent magnet clamping device 4 inner thread, for fixing upper end annular permanent magnet 16, described upper end permanent magnet fixed cover 3 and not magnetic conduction linear bearing 2 are connected by the first bolt 14, and the outer end of helical spring 7 is vertically disposed with by the fixing upper end helical spring clamping device 5 of the second bolt 13 and lower end helical spring clamping device 8, upper end helical spring clamping device 5 is connected by the internal thread of its upper end boss and the outer wall thread of upper end permanent magnet clamping device 4, the boss internal thread place, lower end of lower end helical spring clamping device 8 is fixed with externally threaded lower end permanent magnet clamping device 9, place lower end annular permanent magnet 17 in lower end permanent magnet clamping device 9, permanent magnet clamping device 9 lower end, lower end is fixed with the retainingf key 10 for connecting outside vibration source by internal thread, upper end permanent magnet clamping device 4 is fixed by the 3rd bolt 12 by the upper end boss of described upper end helical spring clamping device 5, and lower end permanent magnet clamping device 9 is fixed by the 4th bolt 11 by the lower end boss of lower end helical spring clamping device 8.
Upper end annular permanent magnet 16 and lower end annular permanent magnet 17 relative position is vertically regulated by knob upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9.
First annular permanent magnet 15 is set in the central cavity of described helical spring 7, and the first annular permanent magnet 15 is installed fastening by the internal and external threads of quality strut 1 with middle permanent magnet fixed cover 6 and helical spring 7 and moves with helical spring 7.Described helical spring 7 is clamped by upper end helical spring clamping device 5 and lower end helical spring clamping device 8, makes helical spring 7 by clamping fastener upper end helical spring clamping device 5 and the locking of lower end helical spring clamping device 8 by the second bolt 13.
Preferably, the lower end of described lower end helical spring clamping device 8 is connected with lower end permanent magnet clamping device 9 outer cylinder surface screw-thread fit by inner periphery screw thread, and regulates lower end annular permanent magnet 17 position vertically.Described lower end permanent magnet clamping device 9 is matched with retainingf key 10 circle cap outside thread by the screw thread of inner periphery, and by wherein fastening for lower end annular permanent magnet 17.Lower end helical spring clamping device 8 is tightened together with lower end permanent magnet clamping device 9 by the 4th bolt 11 by the boss side surfaces of described lower end helical spring clamping device 8.
By upper end permanent magnet fixed cover 3 and retainingf key 10 upper end permanent magnet clamping device 4 and lower end permanent magnet clamping device 9 respectively precession different depth regulate the upper end annular permanent magnet 16 of installation and the thickness of lower end annular permanent magnet 17.
Described not magnetic conduction linear bearing 2 adopts metallic copper, and the remaining part of described vibration isolator except not magnetic conduction linear bearing 2 adopts non-magnetic metallic material.
Preferably, described upper end annular permanent magnet 16 and lower end annular permanent magnet 17 are set to 10mm with the initial mounting distance of intermediate annular permanent magnet 15.
Working principle of the present invention is: during use, is connected the upper end of quality strut 1 with by control structure, and retainingf key 10 is connected with outside vibration source; When quality strut 1, helical spring 7 and intermediate annular permanent magnet 15 and when producing relative movement between upper end helical spring clamping device 5 and lower end helical spring clamping device 8, upper end annular permanent magnet 16 and lower end annular permanent magnet 17 attract the intermediate annular permanent magnet 15 clamped by helical spring 7 respectively; The magnetic field that upper end annular permanent magnet 16, intermediate annular permanent magnet 15 and lower end annular permanent magnet 17 produce produces foucault current in the non-magnetic Structural Hardware of contrive equipment, thus produce the damping force contrary with moving direction, improve and be improved to damping characteristic of the present invention.In apparatus of the present invention, upper end annular permanent magnet 16, intermediate annular permanent magnet 15 and lower end annular permanent magnet 17 form magnet spring, and it is contrary with the restoring force direction that helical spring 7 provides for intermediate annular permanent magnet 15 that upper end annular permanent magnet 16 and lower end annular permanent magnet 17 act on magnetic restoring force total on intermediate annular permanent magnet 15.Therefore, magnet spring can be vibrating isolation system and provides nonlinear magnetic properties restoring force and non-linear negative stiffness, thus can reduce the rigidity of apparatus of the present invention near its working position, widens vibration isolation frequency band, and then can isolate low-frequency vibration.
Claims (5)
1. the quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring, it is characterized in that: comprise helical spring (7), be arranged on the first annular permanent magnet (15) in helical spring (7) central cavity, be arranged on the permanent magnet fixed cover (6) of helical spring (7) central cavity upper end, the threaded one end section of the quality strut (1) of the two ends section of being threaded is through the screwed hole of centre bottom the tapped hole of permanent magnet fixed cover (6), the center hole of intermediate annular permanent magnet (15) and helical spring (7) central cavity, screwed hole of centre bottom the tapped hole of described middle permanent magnet fixed cover (6) and helical spring (7) central cavity and the thread section of quality strut (1) suitable, the center hole of described first annular permanent magnet (15) and the thread section Spielpassung of quality strut (1), without the axial not magnetic conduction linear bearing (2) being provided with about beam quality strut (1) and making it move vertically of thread section in the middle of described quality strut (1), the outer installment of magnetic conduction linear bearing (2) does not have inner and outer wall screwed upper end permanent magnet clamping device (4), upper end annular permanent magnet (16) is placed with in the cavity of upper end permanent magnet clamping device (4) and formation between magnetic conduction linear bearing (2), the top open part of upper end permanent magnet clamping device (4) is provided with suitable with externally threaded upper end permanent magnet fixed cover (3) with upper end permanent magnet clamping device (4) inner thread, for fixing upper end annular permanent magnet (16), described upper end permanent magnet fixed cover (3) and not magnetic conduction linear bearing (2) are connected by the first bolt (14), and the outer end of helical spring (7) is vertically disposed with by fixing upper end helical spring clamping device (5) of the second bolt (13) and lower end helical spring clamping device (8), upper end helical spring clamping device (5) is connected by the internal thread of its upper end boss and the outer wall thread of upper end permanent magnet clamping device (4), the boss internal thread place, lower end of lower end helical spring clamping device (8) is fixed with externally threaded lower end permanent magnet clamping device (9), place lower end annular permanent magnet (17) in lower end permanent magnet clamping device (9), permanent magnet clamping device (9) lower end, lower end is fixed with the retainingf key (10) for connecting outside vibration source by internal thread, upper end permanent magnet clamping device (4) is fixed by the 3rd bolt (12) by the upper end boss of described upper end helical spring clamping device (5), and lower end permanent magnet clamping device (9) is fixed by the 4th bolt (11) by the lower end boss of lower end helical spring clamping device (8).
2. a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring according to claim 1, is characterized in that: regulate upper end annular permanent magnet (16) and lower end annular permanent magnet (17) relative position vertically by knob upper end permanent magnet clamping device (4) and lower end permanent magnet clamping device (9).
3. a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring according to claim 1, is characterized in that: by upper end permanent magnet fixed cover (3) and retainingf key (10) in upper end permanent magnet clamping device (4) and lower end permanent magnet clamping device (9) respectively precession different depth to the thickness of the upper end annular permanent magnet (16) and lower end annular permanent magnet (17) that regulate installation.
4. a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring according to claim 1, it is characterized in that: described not magnetic conduction linear bearing (2) adopts metallic copper, the remaining part of described vibration isolator except not magnetic conduction linear bearing (2) adopts non-magnetic metallic material.
5. a kind of quasi-zero stiffness vibration isolators adopting helical spring in parallel with magnet spring according to claim 1, is characterized in that: described upper end annular permanent magnet (16) and lower end annular permanent magnet (17) are set to 10mm with the initial mounting distance of intermediate annular permanent magnet (15).
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| CN201510097824.XA CN104747652B (en) | 2015-03-05 | 2015-03-05 | A kind of quasi-zero stiffness vibration isolators using helical spring in parallel with magnet spring |
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| CN201510097824.XA CN104747652B (en) | 2015-03-05 | 2015-03-05 | A kind of quasi-zero stiffness vibration isolators using helical spring in parallel with magnet spring |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156577A (en) * | 2015-09-07 | 2015-12-16 | 西安交通大学 | Overdamped vibration isolator capable of generating negative stiffness through inclined magnets |
| CN105179543A (en) * | 2015-10-08 | 2015-12-23 | 厦门艾美森新材料科技股份有限公司 | Mini magnetic damping control device and buffer cushion machine |
| CN107654551A (en) * | 2017-10-25 | 2018-02-02 | 西安交通大学 | A kind of multiple degrees of freedom low frequency vibration isolation device based on mode of oscillation and pendulum modal coupling |
| CN108662055A (en) * | 2018-07-30 | 2018-10-16 | 上海大学 | A kind of quasi-zero stiffness vibration isolators of positive and negative Stiffness |
| CN108708927A (en) * | 2018-05-24 | 2018-10-26 | 上海大学 | A kind of Variable Stiffness Vibration Isolator based on multilayer dielectric elastomer film |
| CN109027124A (en) * | 2018-09-12 | 2018-12-18 | 西安交通大学 | A kind of adjustable torsion quasi-zero stiffness vibration isolators of negative stiffness and control method |
| CN111963602A (en) * | 2020-08-31 | 2020-11-20 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
| CN111981085A (en) * | 2020-08-31 | 2020-11-24 | 合肥工业大学 | Elasticity-hysteresis low-frequency large-displacement vibration isolator based on electromagnetic negative stiffness |
| CN113759570A (en) * | 2020-06-02 | 2021-12-07 | Oppo广东移动通信有限公司 | Nose pad subassembly and glasses |
| CN113757285A (en) * | 2021-09-08 | 2021-12-07 | 重庆大学 | Negative stiffness generating mechanism and quasi-zero stiffness vibration isolator |
| CN115596795A (en) * | 2022-10-27 | 2023-01-13 | 重庆大学（Cn） | Viscous inertia damper |
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| CN109139760B (en) * | 2018-09-12 | 2020-08-14 | 西安交通大学 | Quasi-zero stiffness vibration isolator with positive stiffness and negative stiffness connected in parallel |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156577B (en) * | 2015-09-07 | 2017-03-29 | 西安交通大学 | A kind of employing tilting magnet produces the super damping isolator of negative stiffness |
| CN105156577A (en) * | 2015-09-07 | 2015-12-16 | 西安交通大学 | Overdamped vibration isolator capable of generating negative stiffness through inclined magnets |
| CN105179543A (en) * | 2015-10-08 | 2015-12-23 | 厦门艾美森新材料科技股份有限公司 | Mini magnetic damping control device and buffer cushion machine |
| CN107654551A (en) * | 2017-10-25 | 2018-02-02 | 西安交通大学 | A kind of multiple degrees of freedom low frequency vibration isolation device based on mode of oscillation and pendulum modal coupling |
| CN107654551B (en) * | 2017-10-25 | 2019-08-13 | 西安交通大学 | A kind of multiple degrees of freedom low frequency vibration isolation device based on mode of oscillation and pendulum modal coupling |
| CN108708927B (en) * | 2018-05-24 | 2019-04-30 | 上海大学 | A kind of Variable Stiffness Vibration Isolator based on multilayer dielectric elastomer film |
| CN108708927A (en) * | 2018-05-24 | 2018-10-26 | 上海大学 | A kind of Variable Stiffness Vibration Isolator based on multilayer dielectric elastomer film |
| CN108662055A (en) * | 2018-07-30 | 2018-10-16 | 上海大学 | A kind of quasi-zero stiffness vibration isolators of positive and negative Stiffness |
| CN109027124A (en) * | 2018-09-12 | 2018-12-18 | 西安交通大学 | A kind of adjustable torsion quasi-zero stiffness vibration isolators of negative stiffness and control method |
| CN109027124B (en) * | 2018-09-12 | 2020-02-11 | 西安交通大学 | Torsion quasi-zero stiffness vibration isolator with adjustable negative stiffness and control method |
| CN113759570A (en) * | 2020-06-02 | 2021-12-07 | Oppo广东移动通信有限公司 | Nose pad subassembly and glasses |
| CN113759570B (en) * | 2020-06-02 | 2023-10-31 | Oppo广东移动通信有限公司 | Nose pad assembly and glasses |
| CN111963602A (en) * | 2020-08-31 | 2020-11-20 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
| CN111981085A (en) * | 2020-08-31 | 2020-11-24 | 合肥工业大学 | Elasticity-hysteresis low-frequency large-displacement vibration isolator based on electromagnetic negative stiffness |
| CN111963602B (en) * | 2020-08-31 | 2021-09-21 | 合肥工业大学 | Bistable nonlinear energy hydrazine based on electromagnetic negative stiffness |
| CN111981085B (en) * | 2020-08-31 | 2022-03-15 | 合肥工业大学 | Elasticity-hysteresis low-frequency large-displacement vibration isolator based on electromagnetic negative stiffness |
| CN113757285A (en) * | 2021-09-08 | 2021-12-07 | 重庆大学 | Negative stiffness generating mechanism and quasi-zero stiffness vibration isolator |
| CN115596795A (en) * | 2022-10-27 | 2023-01-13 | 重庆大学（Cn） | Viscous inertia damper |
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