CN109404464B - Pendulum type high static low dynamic vibration isolator - Google Patents
Pendulum type high static low dynamic vibration isolator Download PDFInfo
- Publication number
- CN109404464B CN109404464B CN201811521075.9A CN201811521075A CN109404464B CN 109404464 B CN109404464 B CN 109404464B CN 201811521075 A CN201811521075 A CN 201811521075A CN 109404464 B CN109404464 B CN 109404464B
- Authority
- CN
- China
- Prior art keywords
- sliding block
- spring
- vibration isolation
- pendulum
- vibration isolator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F16F7/00—Vibration-dampers; Shock-absorbers
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
-
- 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
- F16F2228/04—Frequency effects
Abstract
The invention discloses a pendulum high-static low-dynamic vibration isolator which comprises a sliding block, a rigid rod, a vertical spring, a left oblique spring, a right oblique spring, a sliding chute and a straight rod, wherein: the sliding block is sleeved on the straight rod, the lower end of the sliding block is fixed through the vertical spring, and the sliding block can move up and down along the vertical direction of the straight rod; the upper end of the vertical spring is connected with the sliding block, and the lower end of the vertical spring is fixed; the sliding block is connected with two ends of the rigid rod through a left inclined spring and a right inclined spring; the two ends of the rigid rod slide in the sliding grooves. The pendulum type high static low dynamic vibration isolator designed by the invention presents soft characteristic nonlinearity, the resonance frequency of the soft nonlinear structure is far less than that of the linear structure, the system is stable when the vibration isolation frequency is more than the resonance frequency, and the amplitude of the vibration isolation system is less than that of the hard characteristic nonlinear vibration isolation system and the linear vibration isolation system. Therefore, the pendulum type high static low dynamic vibration isolator can carry out vibration isolation at lower frequency, has wider vibration isolation frequency band and has good vibration isolation effect.
Description
Technical Field
The invention belongs to the technical field of vibration isolation, and relates to a low-frequency vibration isolator.
Background
The traditional vibration isolation technology has a poor vibration isolation effect on low-frequency vibration, particularly ultra-low-frequency vibration. The quasi-zero stiffness vibration isolator has the stiffness characteristics of high static and low dynamic, can effectively improve the system stability and the static bearing capacity, has excellent low-frequency vibration isolation performance, and is widely concerned by domestic and foreign scholars. The concept of high static and low dynamic was first proposed in 1957 by Molyneux, an engineer in the united kingdom. The high static and low dynamic mean that the high static rigidity and the low dynamic rigidity are simultaneously provided. The high static rigidity can ensure that the static deformation of the system is small; the low dynamic stiffness reduces the natural frequency of the system, so that the vibration isolation interval can be expanded. In 1989, Alabuzhev et al introduced the concept of quasi-zero stiffness for the first time and applied it to vibration protection and measurement systems. In 2006, Caochenge et al proposed SD vibrators (smooth and discontinuous vibrators) and indicated that they are geometrically nonlinear structures with quasi-zero stiffness characteristics, as shown in FIG. 1. The quasi-zero stiffness model of alashuzhev was simplified to a cubic nonlinear system by Carrella and Kovacic et al, university of south ampton, uk, 2007, and analyzed as shown in fig. 2. The korean fig. 2012 created a new geometric nonlinear dynamical model, as shown in fig. 3, and studied the nonlinear characteristics thereof. Wang et al studied a two-degree-of-freedom quasi-zero stiffness vibration isolation system in 2017, as shown in fig. 4, and compared with a single-degree-of-freedom vibration isolation system, the vibration isolation effect of the system was demonstrated.
As shown in fig. 5, when the spring rate and other conditions are the same, the non-linear quasi-zero stiffness vibration isolation system has a significantly lower resonance frequency than the linear vibration isolation system, and therefore when the vibration isolation frequency is greater than ω3In the process, the amplitude of the nonlinear vibration isolation system is smaller than that of the linear vibration isolation system, and the quasi-zero stiffness system can reach a vibration isolation interval far superior to that of the linear vibration isolation system through reasonable damping configuration.
However, although the structure having a hard characteristic can isolate a low frequency, the structure has a certain disadvantage. As can be seen from FIG. 5, there are two at multiple de-frequency bands of the nonlinear system primary resonance amplitude frequency responseAn asymptotically stable solution and an unstable solution, and when the vibration isolation frequency is at ω because the skeleton line of the hard nonlinear system is tilted to the right3ω4In between, a stiff non-linear vibration isolation system would not be ideal for vibration isolation when it would produce the illustrated bouncing phenomenon. Since the skeleton line of the main resonance of the soft nonlinear system inclines to the left, when the vibration isolation frequency is higher than the resonance frequency omega1When the vibration isolation system is used, the system is stable, and the amplitude of the system is smaller than that of a rigid nonlinear vibration isolation system and a linear vibration isolation system. Therefore, compared with a vibration isolation system with soft characteristics, the vibration isolation system can perform vibration isolation at lower frequency, has wider vibration isolation frequency band and better vibration isolation effect.
Disclosure of Invention
In order to avoid the influence of the nonlinearity of the hard characteristic caused by high static and low dynamic vibration isolation, the invention designs a pendulum type high static and low dynamic vibration isolator. Because the gravity pendulum is a nonlinear system with typical soft characteristics, in order to weaken the hard characteristics of the whole structure, the invention designs the pendulum type high static and low dynamic vibration isolation device which combines the gravity pendulum and the inclined spring support, so that the structure presents soft characteristics, and a better vibration isolation effect in a wider frequency band is achieved.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a high quiet low isolator that moves of pendulum-type, includes slider, rigid bar, vertical spring, left side oblique spring, right side oblique spring, spout, straight-bar, wherein:
the sliding block is sleeved on the straight rod, the lower end of the sliding block is fixed through the vertical spring, and the sliding block can move up and down along the vertical direction of the straight rod;
the upper end of the vertical spring is connected with the sliding block, and the lower end of the vertical spring is fixed;
the sliding block is connected with two ends of the rigid rod through a left inclined spring and a right inclined spring;
the two ends of the rigid rod slide in the sliding grooves.
Compared with the prior art, the invention has the following advantages:
the pendulum type high static low dynamic vibration isolator designed by the invention presents soft characteristic nonlinearity, the resonance frequency of the soft nonlinear structure is far less than that of the linear structure, the system is stable when the vibration isolation frequency is more than the resonance frequency, and the amplitude of the vibration isolation system is less than that of the hard characteristic nonlinear vibration isolation system and the linear vibration isolation system. Therefore, the pendulum type high static low dynamic vibration isolator can carry out vibration isolation at lower frequency, has wider vibration isolation frequency band and has good vibration isolation effect.
Drawings
FIG. 1 is a SD vibrator model;
FIG. 2 is a quasi-zero stiffness three-spring model of Carrela;
FIG. 3 is a drawing of a novel non-linear model built by Hanyanwei;
FIG. 4 is an improved model of Wang;
FIG. 5 is a graph showing soft and hard characteristics and linear system amplitude-frequency curves;
FIG. 6 is a geometric model of the pendulum high-static low-dynamic vibration isolator in a first embodiment, a-at-rest, b-swung into position;
fig. 7 is a geometric model of the pendulum type high static low dynamic vibration isolator in the second embodiment;
fig. 8 is a geometric model of the pendulum type high static low dynamic vibration isolator in the third embodiment;
fig. 9 is a geometric model of the pendulum type high static low dynamic vibration isolator in the fourth embodiment.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings, but not limited thereto, and any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention shall be covered by the protection scope of the present invention.
The first embodiment is as follows: in the embodiment, a geometric non-linear model with two degrees of freedom is taken as a research object, a pendulum type high static and low dynamic vibration isolation device combining a gravity pendulum and a bevel spring support is designed, and the established geometric model is shown in fig. 6.
As shown in fig. 6, the pendulum-type high static-low dynamic vibration isolator of the present embodiment is composed of a slider 1, a rigid rod 2, a vertical spring 3, a left side inclined spring 4, a right side inclined spring 5, a chute 6, and a straight rod 7, wherein: the mass of the sliding block 1 is M, and the mass of the rigid rod 2 is Mm, the moment of inertia relative to the center of the track is J, and the elastic coefficient of the vertical spring 3 is kvThe elastic coefficient of the left side inclined spring 4 is k1The right side inclined spring 5 has an elastic coefficient k2. The geometry of the rigid bar 2 is designed so that its centre of mass is on the circular track 8. Two ends of the rigid rod 2 are connected with the sliding block 1 through a left inclined spring 4 and a right inclined spring 5, and two ends of the rigid rod slide in the sliding groove 6 to limit the motion track of the rigid rod. The sliding block 1 is sleeved on the fixed straight rod 7 to limit the motion track of the sliding block to move vertically, and the lower end of the sliding block 1 is fixed through the vertical spring 3. Fig. 6(a) and (b) illustrate that during vibration, the rigid rod 2 can rotate in the slide groove 6, while the slider 1 can move in the vertical direction.
In the present embodiment, the center of the circular track 8 is on the same vertical line as the slider 1.
In this embodiment, the circular track 8 is concentric with the chute 6, so as to ensure that the rigid rod 2 rotates around the center of the circular track 8.
The innovation point of this embodiment is that the rigid rod 2 shown in fig. 6 is adopted, and the rigid rod 2 acts like a gravity pendulum, and here we aim to utilize the soft characteristic of the gravity pendulum to weaken the hard characteristic of the system.
The second embodiment is as follows: as shown in fig. 7, the present embodiment is different from the first embodiment in that the chute 6 is replaced with a circular track, and the circular track 8 are concentric circles. The circular ring track and the sliding groove 6 also have the function of limiting the rigid rod to enable the rigid rod to rotate around the circle center, but the rigid rod is easier to process during specific manufacturing.
The third concrete implementation mode: as shown in fig. 8, the difference between this embodiment and the first and second embodiments is that the straight rod 7 is replaced by a sliding chute a, and the sliding block 1 is located in the sliding chute a and can move up and down in the sliding chute a along the vertical direction. Compared with the straight rod 7, the sliding groove A has smaller friction force under the same lubricating condition when the sliding block 1 moves in the vertical direction.
The fourth concrete implementation mode: as shown in fig. 9, the difference between the first, second and third embodiments is that the chute 6 and the straight rod 7 can be fixed together for easy processing during actual manufacturing.
Claims (6)
1. The utility model provides a high quiet low isolator that moves of pendulum-type which characterized in that the high quiet low isolator that moves of pendulum-type includes slider, stiff rod, vertical spring, left side oblique spring, right side oblique spring, spout, straight-bar, wherein:
the sliding block is sleeved on the straight rod, the lower end of the sliding block is fixed through the vertical spring, and the sliding block can move up and down along the vertical direction of the straight rod;
the upper end of the vertical spring is connected with the sliding block, and the lower end of the vertical spring is fixed;
the sliding block is connected with two ends of the rigid rod through a left inclined spring and a right inclined spring;
the two ends of the rigid rod slide in the sliding grooves.
2. The pendulum high static low dynamic vibration isolator of claim 1 wherein said runners are replaced with circular ring tracks.
3. The pendulum-type high static low dynamic vibration isolator of claim 2 wherein said circular ring track and circular track are concentric circles.
4. The pendulum-type high static low dynamic vibration isolator of claim 1 or 2, wherein said straight rod is replaced by a sliding chute a, and the sliding block is located in the sliding chute a.
5. The pendulum-type high static low dynamic vibration isolator of claim 1 wherein the center of mass of the stiff rod is on a circular orbit, the center of the circular orbit being on the same vertical line as the slider.
6. The pendulum-type high static low dynamic vibration isolator of claim 5, wherein said circular track is concentric with the chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811521075.9A CN109404464B (en) | 2018-12-12 | 2018-12-12 | Pendulum type high static low dynamic vibration isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811521075.9A CN109404464B (en) | 2018-12-12 | 2018-12-12 | Pendulum type high static low dynamic vibration isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404464A CN109404464A (en) | 2019-03-01 |
| CN109404464B true CN109404464B (en) | 2020-05-26 |
Family
ID=65458729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811521075.9A Active CN109404464B (en) | 2018-12-12 | 2018-12-12 | Pendulum type high static low dynamic vibration isolator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404464B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110541905B (en) * | 2019-09-12 | 2021-03-23 | 郑州轻工业学院 | Debugging method of vibration isolation platform formed by three groups of inclined springs |
| CN110529554B (en) * | 2019-09-12 | 2020-12-18 | 郑州轻工业学院 | Debugging method of vibration isolation platform formed by double groups of inclined springs |
| CN112576689B (en) * | 2020-12-04 | 2021-08-13 | 哈尔滨工程大学 | Low-frequency heavy-load quasi-zero stiffness vibration isolation device |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4365770A (en) * | 1978-08-04 | 1982-12-28 | United Technologies Corp. | Fixed position variable frequency pendular-type vibration absorber |
| US4778037A (en) * | 1985-06-07 | 1988-10-18 | Papadopoulos Demetrios G | Vibration or shock isolators with tension and compression springs arranged equiangularly in a rosette |
| JPH0953681A (en) * | 1995-08-18 | 1997-02-25 | Univ Kyoto | Gravity acting type dynamic vibration reducer and its vibration period adjusting method |
| CN202132428U (en) * | 2011-06-29 | 2012-02-01 | 湖南大学 | Nonlinear magnetic vibration isolator with para-zero rigidity |
| CN102606673A (en) * | 2012-03-26 | 2012-07-25 | 湖南大学 | Load-bearing adjustable zero-stiffness electromagnetic vibration isolator and control method thereof |
| CN202520846U (en) * | 2012-03-26 | 2012-11-07 | 湖南大学 | Low-frequency vibration isolator aiming at foundation excitation |
| CN105864339A (en) * | 2016-06-01 | 2016-08-17 | 福州大学 | Quasi-zero stiffness vibration isolator applicable to isolation of micro-amplitude and low-frequency vibration and realization method of quasi-zero stiffness vibration isolator |
| CN205780563U (en) * | 2016-05-23 | 2016-12-07 | 福州大学 | Drawing quasi-zero stiffness vibration isolators |
| CN205824020U (en) * | 2016-06-20 | 2016-12-21 | 南京航空航天大学 | A kind of scissors quasi-zero stiffness vibration isolators |
| CN106742091A (en) * | 2016-12-27 | 2017-05-31 | 哈尔滨工业大学 | One class has the zero of zero-frequency vibration isolation feature（It is micro-）Levitation method and device |
| CN107250595A (en) * | 2014-12-05 | 2017-10-13 | Esm能源及振动控制技术米奇有限公司 | Adaptation pendulum-type buffer certainly with uprighting spring device |
| DE102017111304A1 (en) * | 2016-05-25 | 2017-11-30 | Valeo Embrayages | Torque transmission device, in particular for a motor vehicle |
| CN107816146A (en) * | 2017-11-14 | 2018-03-20 | 中国地震局工程力学研究所 | Nonlinear energy trap damper based on filtering |
| CN108644311A (en) * | 2018-05-22 | 2018-10-12 | 东北大学 | One kind is based on hardening cube rigidity bump leveller implementation method and bump leveller |
| CN108799405A (en) * | 2018-06-28 | 2018-11-13 | 天津航天机电设备研究所 | A kind of zero stiffness isolation mounting of irrotational displacement |
-
2018
- 2018-12-12 CN CN201811521075.9A patent/CN109404464B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4365770A (en) * | 1978-08-04 | 1982-12-28 | United Technologies Corp. | Fixed position variable frequency pendular-type vibration absorber |
| US4778037A (en) * | 1985-06-07 | 1988-10-18 | Papadopoulos Demetrios G | Vibration or shock isolators with tension and compression springs arranged equiangularly in a rosette |
| JPH0953681A (en) * | 1995-08-18 | 1997-02-25 | Univ Kyoto | Gravity acting type dynamic vibration reducer and its vibration period adjusting method |
| CN202132428U (en) * | 2011-06-29 | 2012-02-01 | 湖南大学 | Nonlinear magnetic vibration isolator with para-zero rigidity |
| CN102606673A (en) * | 2012-03-26 | 2012-07-25 | 湖南大学 | Load-bearing adjustable zero-stiffness electromagnetic vibration isolator and control method thereof |
| CN202520846U (en) * | 2012-03-26 | 2012-11-07 | 湖南大学 | Low-frequency vibration isolator aiming at foundation excitation |
| CN107250595A (en) * | 2014-12-05 | 2017-10-13 | Esm能源及振动控制技术米奇有限公司 | Adaptation pendulum-type buffer certainly with uprighting spring device |
| CN205780563U (en) * | 2016-05-23 | 2016-12-07 | 福州大学 | Drawing quasi-zero stiffness vibration isolators |
| DE102017111304A1 (en) * | 2016-05-25 | 2017-11-30 | Valeo Embrayages | Torque transmission device, in particular for a motor vehicle |
| CN105864339A (en) * | 2016-06-01 | 2016-08-17 | 福州大学 | Quasi-zero stiffness vibration isolator applicable to isolation of micro-amplitude and low-frequency vibration and realization method of quasi-zero stiffness vibration isolator |
| CN205824020U (en) * | 2016-06-20 | 2016-12-21 | 南京航空航天大学 | A kind of scissors quasi-zero stiffness vibration isolators |
| CN106742091A (en) * | 2016-12-27 | 2017-05-31 | 哈尔滨工业大学 | One class has the zero of zero-frequency vibration isolation feature（It is micro-）Levitation method and device |
| CN107816146A (en) * | 2017-11-14 | 2018-03-20 | 中国地震局工程力学研究所 | Nonlinear energy trap damper based on filtering |
| CN108644311A (en) * | 2018-05-22 | 2018-10-12 | 东北大学 | One kind is based on hardening cube rigidity bump leveller implementation method and bump leveller |
| CN108799405A (en) * | 2018-06-28 | 2018-11-13 | 天津航天机电设备研究所 | A kind of zero stiffness isolation mounting of irrotational displacement |
Non-Patent Citations (4)
| Title |
|---|
| An Ultra-Low Frequency Two DOFs’ Vibration Isolator;Wang Min;《Mathematical Problems in Engineering》;20161231;1-15 * |
| Analytical study of the low frequency multi-direction isolator with high-static-low-dynamic stiffness struts and spatial pendulum;Dong,Guangxu;《Mechanical Systems and Signal Processing》;20180915;第110卷;521-539 * |
| How Pendulum Studies Can Promote Knowledge;Michael R. Matthews;《Journal of Science Education and Technology》;20011231;第10卷;359-368 * |
| 一类几何非线性系统的动力学行为及应用研究;韩彦伟;《中国博士学位论文全文数据库 基础科学辑》;20160315(第03期);第2-8页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109404464A (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109404464B (en) | Pendulum type high static low dynamic vibration isolator | |
| CN103790106B (en) | There is the parallel connection type negative stiffness structures isolation effect vibration damping holder of disk spring | |
| CN102506110B (en) | Permanent magnet low frequency single-degree-of-freedom vibration isolation mechanism based on negative stiffness theory | |
| CN202065410U (en) | Tuned mass damper structure for reducing pipe vibration | |
| CN109434002A (en) | A kind of steel ball production cold-heading equipment with shock-absorbing function | |
| CN108167363B (en) | Two-degree-of-freedom positive and negative stiffness parallel low-frequency vibration isolation device | |
| CN109973571A (en) | A kind of quasi-zero stiffness vibration isolators with horizontal damping | |
| CN208280702U (en) | A kind of universal sliding type horizontal tuned mass damper | |
| CN105201094B (en) | A kind of X-type anisotropy friction double pendulum vibration absorption and isolation support | |
| CN211572063U (en) | Support for building that anti-seismic performance is good | |
| CN210265295U (en) | Accelerated cooling type fan damping mechanism | |
| CN209083895U (en) | A kind of zero stiffness isolation mounting of irrotational displacement | |
| CN103835389A (en) | Rotational inertia mass damper | |
| CN206111495U (en) | Superstrong shock attenuation air compressor machine | |
| Matsuhisa et al. | Vibration control of a ropeway carrier by passive dynamic vibration absorbers | |
| CN106758784B (en) | A kind of Longspan Bridge vibration absorber | |
| CN212053289U (en) | Eddy current type damping device with large adjustable range based on sliding surface | |
| CN205046694U (en) | X type anisotropic friction double pendulum subtracts isolation bearing | |
| CN208202196U (en) | A kind of electromagnetic levitation type universal type horizontal tuned mass damper | |
| CN105156577A (en) | Overdamped vibration isolator capable of generating negative stiffness through inclined magnets | |
| CN107547812A (en) | Television set | |
| CN206655108U (en) | A kind of Longspan Bridge vibration absorber | |
| CN107842570B (en) | Three-dimensional isolation bearing of electric eddy current | |
| CN109973568A (en) | A kind of quasi- zero stiffness support rod | |
| JPH06117485A (en) | Frequency coping type vibration damper |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |