CN116518015A - Beam-focusing cantilever support quasi-zero stiffness vibration isolation device - Google Patents

Beam-focusing cantilever support quasi-zero stiffness vibration isolation device Download PDF

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Publication number
CN116518015A
CN116518015A CN202310564435.8A CN202310564435A CN116518015A CN 116518015 A CN116518015 A CN 116518015A CN 202310564435 A CN202310564435 A CN 202310564435A CN 116518015 A CN116518015 A CN 116518015A
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CN
China
Prior art keywords
stiffness
rigidity
negative
positive
quasi
Prior art date
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Pending
Application number
CN202310564435.8A
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Chinese (zh)
Inventor
卢佳佳
张文明
颜格
亓文豪
闫寒
时军委
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Priority to CN202310564435.8A priority Critical patent/CN116518015A/en
Publication of CN116518015A publication Critical patent/CN116518015A/en
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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
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/06—Magnetic or electromagnetic
    • 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
    • F16F2228/00—Functional characteristics, e.g. variability, frequency-dependence
    • F16F2228/06—Stiffness
    • F16F2228/063—Negative stiffness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)

Abstract

A beam gathering cantilever support quasi-zero stiffness vibration isolation device comprising: base, rectilinear motion subassembly, negative rigidity structural component and positive rigidity structural component, wherein: the linear motion assembly is vertically arranged on the base, and the negative stiffness structure with monostable negative stiffness and the positive stiffness structure with nonlinear gradually-hardened positive stiffness are arranged on the linear motion assembly in series. The invention adopts the beam-focusing cantilever structure to provide monostable negative rigidity, the repulsive magnet provides nonlinear positive rigidity, the nonlinear positive rigidity is utilized to modulate the monostable negative rigidity to realize quasi-zero rigidity, and the design of the vibration isolator does not depend on a bistable negative rigidity structure and a strict linear rigidity structure; the nonlinear positive rigidity is adjustable, when the negative rigidity is changed, the quasi-zero rigidity can still be realized by adjusting the nonlinear positive rigidity structure, the load is borne by the negative rigidity structure and the positive rigidity structure together, and the rated load of the vibration isolation device can be changed by adjusting the initial configuration of the negative rigidity structure and the positive rigidity structure.

Description

Beam-focusing cantilever support quasi-zero stiffness vibration isolation device
Technical Field
The invention relates to a technology in the field of vibration isolation, in particular to a beam-gathering cantilever support quasi-zero stiffness vibration isolation device.
Background
The prior vibration isolator adopts a linear spring as a bearing element, and the vibration isolation initial frequency is thatThe natural frequency of the vibration isolator can be reduced by using a soft spring, but the vibration isolator can be deformed greatly, so that the low-frequency vibration is difficult to effectively isolate by the conventional linear vibration isolator. The quasi-zero stiffness vibration isolator adopts a nonlinear stiffness element to support a load, and the nonlinear stiffness enables the quasi-zero stiffness vibration isolator to have high static stiffness and low dynamic stiffness at the same time, so that the high bearing capacity and the low natural frequency can be considered. Existing quasi-zero stiffness vibration isolators generally utilize bistable negative stiffness to counteract linear positive stiffness to achieve quasi-zero stiffness, a typical bistable negative stiffness structure comprising: a canted spring structure, attracting or repelling magnets, euler-bent beams, a convex-roller structure, and the like. The design requirement of the quasi-zero stiffness vibration isolator which connects the bistable negative stiffness structure and the linear spring in parallel depends on the bistable negative stiffness structure and the strict linear stiffness structure, and the design requirement is strict; once the negative stiffness of the negative stiffness structure changes due to the problems of assembly, fatigue, abrasion and the like, the quasi-zero stiffness characteristic disappears, and the linear spring needs to be replaced to be matched with the negative stiffness structure again so as to restore the quasi-zero stiffness characteristic; the load is borne by the linear spring, and the rated load of the quasi-zero stiffness vibration isolator can be changed by adjusting the compression amount of the linear spring, but the rated load adjusting mode has the defect of narrow load adjusting range. The rigidity of a linear rigidity mechanism of the existing technology for realizing quasi-zero rigidity vibration isolation through the cantilever slice cannot be adjusted, so that the matching range is difficult to adjust.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a beam-focusing cantilever support quasi-zero stiffness vibration isolation device, wherein a beam-focusing cantilever structure is adopted to provide monostable negative stiffness, a repulsive magnet is used to provide nonlinear positive stiffness, the nonlinear positive stiffness is utilized to modulate the monostable negative stiffness to realize quasi-zero stiffness, and the design of a vibration isolator does not depend on a bistable negative stiffness structure and a strict linear stiffness structure; the nonlinear positive rigidity is adjustable, and when the negative rigidity is changed, the quasi-zero rigidity can still be realized by adjusting the nonlinear positive rigidity structure without replacing the component; the load is jointly borne by the negative stiffness structure and the positive stiffness structure, the rated load of the vibration isolation device can be changed by adjusting the initial configuration of the negative stiffness structure and the positive stiffness structure, and compared with the existing quasi-zero stiffness vibration isolator which depends on the bistable negative stiffness structure and the strict linear stiffness structure, the load adjusting range is wider, and the structure is more compact.
The invention is realized by the following technical scheme:
the invention relates to a beam-gathering cantilever support quasi-zero stiffness vibration isolation device, which comprises: base, rectilinear motion subassembly, negative rigidity structural component and positive rigidity structural component, wherein: the linear motion assembly is vertically arranged on the base, and the negative stiffness structure with monostable negative stiffness and the positive stiffness structure with nonlinear gradually-hardened positive stiffness are arranged on the linear motion assembly in series.
The linear motion assembly comprises: guide arm, linear bearing and bearing frame, wherein: one end of the guide rod is connected with the base through threads, the other end of the guide rod is connected with the linear bearing through a spline, and the bearing seat can only move linearly but not rotate around the bearing seat under the constraint of the guide rod.
The linear bearing is provided with a spline, and the shape of the spline is matched with that of the guide rod.
The bearing seat is provided with a central hole, and the linear bearing is embedded into the bearing seat to form interference fit.
The negative stiffness assembly includes: cantilever beam, ball bearing, reducing convex body and clamp splice, wherein: the diameter-variable convex body is sleeved at the bottom end of the linear motion assembly, the cantilevers Liang Shuju are distributed in an array, one end of each cantilever Liang Shuju is fixedly arranged at the top end of the linear motion assembly through a clamping block, the other end of each cantilever Liang Shuju is provided with a ball bearing and is in contact with the diameter-variable convex body, and the radius of the convex body can be changed through rotating the diameter-variable convex body, so that the negative rigidity is adjusted.
The positive stiffness assembly includes: 6 auxiliary permanent magnet bodies, 1 main permanent magnet body and sleeve, wherein: the auxiliary permanent magnet body is embedded in the bearing seat in an interference manner, the main permanent magnet body is sleeved on the guide rod through the sleeve, the height of the main permanent magnet body from the base is adjusted through the limit nut, the repulsive force between the auxiliary permanent magnet body and the main permanent magnet body can be changed, and the positive rigidity is adjusted.
The quasi-zero stiffness vibration isolation refers to: rotating the diameter-changing convex body changes the radius of the convex body to enable the negative stiffness component to generate negative stiffness or adjusting the limiting nut to change the repulsive force between the permanent magnet bodies to adjust positive stiffness so as to enable the negative stiffness to be matched with the negative stiffness, and utilizing nonlinear positive stiffness to modulate monostable negative stiffness to achieve quasi-zero stiffness and adjust rated load of the quasi-zero stiffness vibration isolator.
Technical effects
The invention realizes the design of the quasi-zero stiffness vibration isolator by utilizing the monostable negative stiffness provided by the repulsive magnet to the nonlinear gradual hardening positive stiffness modulation beam gathering cantilever structure, gets rid of the constraint of the bistable negative stiffness structure and the strict linear stiffness structure to the design of the traditional quasi-zero stiffness vibration isolator, and has more flexible design and more compact structure; the nonlinear positive rigidity structure has adjustable rigidity, can realize quasi-zero rigidity by matching different negative rigidities without replacing the component, and has convenient operation and high reliability; the rated load of the vibration isolation device is jointly borne by the negative stiffness structure and the positive stiffness structure, the rated load can be changed by adjusting the configuration of the negative stiffness structure and the positive stiffness structure, and the adjustable range of the rated load is larger than that of the existing quasi-zero stiffness vibration isolator.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a quasi-zero stiffness vibration isolation device of the invention;
FIG. 2 is a schematic illustration of an assembly of a cantilever structure and a second permanent magnet;
FIG. 3 is a schematic view of an assembly of the present invention not including the partial structure of FIG. 2;
FIG. 4 is a top cross-sectional view of a variable diameter boss;
FIG. 5 is a force-displacement graph of the quasi-zero stiffness vibration isolation apparatus, positive stiffness assembly and negative stiffness assembly of the present invention;
FIG. 6 is a graph of force versus displacement for a positive stiffness assembly of the present invention at different large permanent magnet heights;
FIG. 7 is a graph of force versus displacement for a negative stiffness assembly of the present invention at different variable diameter convex body rotation angles;
FIG. 8 is a graph comparing the rated load adjustment range of the quasi-zero stiffness vibration isolation device of the present invention with a prior quasi-zero stiffness implementation;
in the figure: 1 a base, 2 a reducing convex body, 3 a first nut, 4 a cantilever beam, 5 a bearing seat, 6 a clamping block, 7 a first bolt, 8 a guide rod, 9 a second nut, 10 a second permanent magnet, 11 a ball bearing, 12 a spline pair bearing, 13 a third nut, 14 a sleeve, 15 a first permanent magnet, 16 a fourth nut, 17 a fifth nut and 18 a linear bearing.
Detailed Description
As shown in fig. 1 to 3, this embodiment relates to a beam-gathering cantilever support quasi-zero stiffness vibration isolation device, which includes: base 1, rectilinear motion subassembly, negative rigidity structural component and positive rigidity structural component, wherein: the linear motion assembly is vertically arranged on the base 1, and a negative stiffness structure with monostable negative stiffness and a positive stiffness structure with nonlinear gradually-hardened positive stiffness are arranged on the linear motion assembly in series.
The linear motion assembly comprises: guide rod 8 and linear bearing 18 and bearing frame 5 that set up on it, wherein: the linear bearing 18 is fixedly connected with the bearing seat 5.
The bearing seat 5 is provided with a central hole for being embedded into the linear bearing 18 and forms interference fit; the bearing seat 5 can only move linearly but not rotate around itself under the constraint of the guide rod 8.
One end of the guide rod 8 is provided with a thread for connecting with the base 1, and the other end is provided with a spline for sleeving the linear bearing 18.
The linear bearing 18 is preferably a linear bearing 18 with splines, the shape of which is matched with the guide rod 8.
The negative stiffness assembly includes: cantilever beam 4, ball bearing 11, reducing convex body 2 and clamp splice 6, wherein: the reducing convex body 2 is sleeved at the bottom end of the linear motion assembly, one end of the cantilever beam 4 is fixedly arranged at the top end of the linear motion assembly through the clamping block 6, the other end of the cantilever beam is provided with a ball bearing 11 and is contacted with the reducing convex body 2, and the negative rigidity is regulated through rotating the reducing convex body 2.
The number of cantilever beams 4 is preferably 3, and the cantilever beams are uniformly distributed on the periphery of the bearing seat 5 in a circumferential direction.
The ball bearing 11 can roll along the surface of the reducing convex body 2.
As shown in fig. 4, the distance from the outer surface of the reducing convex body 2 to the central axis gradually increases along the circumferential direction, a through hole for nesting the linear bearing 18 is arranged in the center, and the linear bearing 18 is sleeved with the guide rod 8.
The guide rod 8 is provided with a nut for pressing the reducing convex body 2 on the upper surface of the base 1, when the nut is loosened, the reducing convex body 2 can be rotationally adjusted, the radius of the contact position of the convex body and the ball bearing 11 is changed, and the negative rigidity is adjusted.
The positive stiffness assembly includes: a first permanent magnet 15, six second permanent magnets 10 and a sleeve 14, wherein: the first permanent magnet 15 is movably arranged on the linear motion assembly through the sleeve 14, and the second permanent magnet 10 is fixedly arranged at one end of the linear motion assembly.
The second permanent magnet 10 is specifically arranged on the bottom surface of the bearing seat 5, is provided with counter bores distributed in a circumferential array, and is embedded in the counter bores in an interference manner;
the first permanent magnet 15 is provided with a central hole for embedding the sleeve 14, and threads are arranged in the sleeve 14 to be screwed on the guide rod 8.
The guide rod 8 is provided with a limit nut for limiting the position of the first permanent magnet 15, and the height of the first permanent magnet 15 from the base 1 is adjusted by adjusting the limit nut, so that the repulsive force between the second permanent magnet 10 and the first permanent magnet 15 can be changed, and the positive rigidity can be adjusted.
The vibration isolation device parts are preferably made of low magnetic conduction materials except the second permanent magnet 10 and the first permanent magnet 15.
As shown in fig. 5, the negative stiffness component can provide monostable negative stiffness, the positive stiffness component can provide nonlinear gradual stiffness, and the load of the quasi-zero stiffness vibration isolation device is borne by the negative stiffness structure and the positive stiffness structure.
As shown in fig. 6, the quasi-zero stiffness vibration isolation device can adjust the positive stiffness by changing the position of the first permanent magnet 15.
As shown in fig. 7, the quasi-zero stiffness vibration isolation device can change the negative stiffness by rotating the diameter-changing convex body 2.
As shown in fig. 8, the quasi-zero stiffness vibration isolation device can adjust positive stiffness by adjusting and changing the position of the first permanent magnet 15, and change negative stiffness by rotating the reducing convex body 2, so as to realize rated load adjustment.
As shown in fig. 8, compared with the existing quasi-zero stiffness vibration isolator which is formed by parallelly connecting a bistable negative stiffness structure and a linear spring, the vibration isolating device realizes quasi-zero stiffness by modulating a single negative stiffness structure component by utilizing a nonlinear gradual hardening positive stiffness component, does not depend on a bistable negative stiffness structure and a strict linear stiffness structure, is flexible in design and has a wide rated load adjusting range.
Compared with the prior art, the invention provides nonlinear gradual hardening positive rigidity by using the repulsive force between the first permanent magnet 15 and the second permanent magnet 10, and provides monostable negative rigidity by using the reducing convex body 2 to support the beam-gathering cantilever beam 4, thereby realizing a quasi-zero rigidity vibration isolator independent of a bistable negative rigidity structure and having more flexible design; the nonlinear positive rigidity provided by the first permanent magnet 15 and the second permanent magnet 10 is adjustable, when the negative rigidity provided by the negative rigidity structure changes due to the problems of assembly, structural fatigue and the like, the quasi-zero rigidity vibration isolation can still be realized, any component is not required to be replaced, the operation is convenient, and the reliability is high; the rated load of the vibration isolation device is jointly borne by the negative stiffness structure and the positive stiffness structure, the rated load can be changed by adjusting the position of the first permanent magnet 15 and the rotation angle of the reducing convex body 2, and the adjustable range of the rated load is larger than that of the existing quasi-zero stiffness vibration isolator.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.

Claims (8)

1. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device is characterized by comprising: base, rectilinear motion subassembly, negative rigidity structural component and positive rigidity structural component, wherein: the linear motion assembly is vertically arranged on the base, and a negative stiffness structure with monostable negative stiffness and a positive stiffness structure with nonlinear gradual hardening positive stiffness are arranged on the linear motion assembly in series;
the linear motion assembly comprises: guide arm, linear bearing and bearing frame, wherein: one end of the guide rod is connected with the base through threads, the other end of the guide rod is connected with the linear bearing through a spline, and the bearing seat can only move linearly but not rotate around the bearing seat under the constraint of the guide rod.
2. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device of claim 1, wherein the linear bearing is a linear bearing with a spline, and the spline shape is matched with the guide rod.
3. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device according to claim 1, wherein the bearing seat is provided with a central hole, and the linear bearing is embedded into the bearing seat to form interference fit.
4. The beam-gathering cantilever support quasi-zero stiffness vibration isolator as recited in claim 1 wherein the negative stiffness assembly comprises: cantilever beam, ball bearing, reducing convex body and clamp splice, wherein: the diameter-variable convex body is sleeved at the bottom end of the linear motion assembly, the cantilevers Liang Shuju are distributed in an array, one end of each cantilever Liang Shuju is fixedly arranged at the top end of the linear motion assembly through a clamping block, the other end of each cantilever Liang Shuju is provided with a ball bearing and is in contact with the diameter-variable convex body, and the radius of the convex body can be changed through rotating the diameter-variable convex body, so that the negative rigidity is adjusted.
5. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device according to claim 4, wherein the distance from the outer surface of the reducing convex body to the central axis gradually increases along the circumferential direction, a through hole for nesting a linear bearing is arranged in the center, and the linear bearing is sleeved with the guide rod.
6. The beam-gathering cantilever support quasi-zero stiffness vibration isolator of claim 4 wherein the positive stiffness assembly comprises: 6 auxiliary permanent magnet bodies, 1 main permanent magnet body and sleeve, wherein: the auxiliary permanent magnet body is embedded in the bearing seat in an interference manner, the main permanent magnet body is sleeved on the guide rod through the sleeve, the height of the main permanent magnet body from the base is adjusted through the limit nut, the repulsive force between the auxiliary permanent magnet body and the main permanent magnet body can be changed, and the positive rigidity is adjusted.
7. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device according to claim 6, wherein the guide rod is provided with a nut for pressing the reducing convex body on the upper surface of the base, and when the nut is loosened, the reducing convex body can be rotationally adjusted, the radius of the contact position of the convex body and the ball bearing is changed, and the negative stiffness is adjusted.
8. The beam-gathering cantilever support quasi-zero stiffness vibration isolation device as recited in claim 7, wherein the quasi-zero stiffness vibration isolation means: rotating the diameter-changing convex body changes the radius of the convex body to enable the negative stiffness component to generate negative stiffness or adjusting the limiting nut to change the repulsive force between the permanent magnet bodies to adjust positive stiffness so as to enable the negative stiffness to be matched with the negative stiffness, and utilizing nonlinear positive stiffness to modulate monostable negative stiffness to achieve quasi-zero stiffness and adjust rated load of the quasi-zero stiffness vibration isolator.
CN202310564435.8A 2023-05-18 2023-05-18 Beam-focusing cantilever support quasi-zero stiffness vibration isolation device Pending CN116518015A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310564435.8A CN116518015A (en) 2023-05-18 2023-05-18 Beam-focusing cantilever support quasi-zero stiffness vibration isolation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310564435.8A CN116518015A (en) 2023-05-18 2023-05-18 Beam-focusing cantilever support quasi-zero stiffness vibration isolation device

Publications (1)

Publication Number Publication Date
CN116518015A true CN116518015A (en) 2023-08-01

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Application Number Title Priority Date Filing Date
CN202310564435.8A Pending CN116518015A (en) 2023-05-18 2023-05-18 Beam-focusing cantilever support quasi-zero stiffness vibration isolation device

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