CN110486405B - Vibration isolation system with annular metal rubber vibration isolator - Google Patents
Vibration isolation system with annular metal rubber vibration isolator Download PDFInfo
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- CN110486405B CN110486405B CN201910668747.7A CN201910668747A CN110486405B CN 110486405 B CN110486405 B CN 110486405B CN 201910668747 A CN201910668747 A CN 201910668747A CN 110486405 B CN110486405 B CN 110486405B
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- metal rubber
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- vibration isolation
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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
- 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
- F16F7/108—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on plastics springs
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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
- 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
- F16F7/116—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted on metal springs
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Abstract
The invention provides an annular metal rubber vibration isolator and a vibration isolation system for precise load, wherein the vibration isolation system comprises a plurality of annular metal rubber vibration isolators, a base and a load platform, and is characterized in that the plurality of annular metal rubber vibration isolators are uniformly distributed along the circumference or are arranged between the base and the load platform in a square matrix manner, the central symmetry axis of each annular metal rubber vibration isolator is parallel to the planes of the base and the load platform, and the central symmetry axis is determined according to the rigidity requirement of the vibration isolation system; the central symmetry axis of the annular metal rubber vibration isolator points in a plane determined by the design space and load requirements of the vibration isolation system. The invention utilizes the characteristic that the damping radial rigidity of the cylindrical metal rubber is smaller than the axial rigidity, improves the vibration isolation effect and the lateral bearing capacity of the system in the vertical direction, and has simple structure, small volume, light weight and high reliability.
Description
Technical Field
The invention relates to an annular metal rubber vibration isolator and a vibration isolation system, and belongs to the technical field of structural vibration control.
Background
The precise load represented by the photoelectric pod, the visible light CCD camera and the inertial navigation system not only bears important tasks such as information acquisition, navigation and the like in the aerospace task, but also is influenced by vibration generated by the spacecraft/the aircraft. These vibrations are transmitted to the delicate loads through the spacecraft/aircraft structure, affecting its normal operation, reducing its useful life, and further affecting the normal operation of the overall spacecraft/aircraft system. Therefore, there is a need for a lightweight, compact, and highly reliable vibration isolation system for placement between a precision load and a spacecraft/aircraft structure that ensures long-term stable operation of the precision load.
The metal rubber is a novel material in the field of vibration reduction and isolation technology application in recent years, and the annular metal rubber formed by spirally pressing stainless steel metal wires or memory alloy materials has a loose metal structure and good damping characteristics. The working principle is that when the metal rubber is subjected to external pressure, the metal wire meshes deform and move relatively to generate nonlinear dry friction damping to dissipate vibration energy. The annular metal rubber vibration isolator can keep good performance indexes in high and low temperature environments, is strong in ageing resistance and high in reliability, has the characteristics of light weight and small size, and is suitable for vibration isolation application of aerospace precision loads.
However, the metal rubber is not effective in the vibration isolator at present because the design of the vibration isolator aims to make the natural frequency of the vibration isolation system as low as possible and the vibration isolation efficiency as high as possible. However, the requirements for static stiffness determining the carrying capacity and stability and dynamic stiffness determining the vibration isolation performance are in contradiction. The requirements on static rigidity are that the vibration isolator has larger bearing capacity and smaller deformation in each direction so as to meet the stability requirement; the requirement on the dynamic stiffness is to make the dynamic stiffness of the vibration isolator as low as possible so as to realize the requirement of low-frequency vibration isolation, and the vibration isolator has larger attenuation at the same frequency. Therefore, it is a technical difficulty in the art to improve the vibration isolation level in the vertical direction of the vibration isolation system and to improve the load-bearing capacity in the horizontal direction of the vibration isolation system.
Disclosure of Invention
The invention aims to provide an annular metal rubber vibration isolator and a vibration isolation system composed of the annular metal rubber vibration isolator, which provide a stable working environment for precise loads carried on aircrafts/spacecrafts.
Wherein: the annular metal rubber vibration isolator comprises cylindrical metal rubber, an arc-shaped pressing plate, a positioning pipe, a thin-head screw, a spring washer, an upper connecting plate and a lower connecting plate. The position connection relationship is as follows: two arc-shaped pressing plates are oppositely arranged on the inner side of the cylindrical metal rubber, are respectively fixed with the upper connecting plate and the lower connecting plate through thin-head screws, spring washers and positioning pipes, and compress the cylindrical metal rubber. The compression degree of the cylindrical metal rubber can be adjusted by adjusting the screwing depth of the thin head screw relative to the upper and lower connection plates and the height of the positioning pipe. The cylindrical metal rubber is formed by winding stainless steel material filaments.
The vibration isolation system comprises three or more annular metal rubber vibration isolators, a base and a load platform. The position connection relationship is as follows: a plurality of annular metal rubber vibration isolators are arranged between the base and the load platform, the central symmetry axes of the annular metal rubber vibration isolators are parallel to the planes of the base and the load platform, and the positions and the directions of the central symmetry axes in the planes are determined by the actual design space and the load requirements of the vibration isolation system. The annular metal rubber vibration isolator can be uniformly distributed along the circumference or arranged in a square matrix, and for the circumferential uniform distribution arrangement mode, the central symmetry axis direction of the annular metal rubber vibration isolator can be uniformly distributed along the tangential direction of the installation circumference or uniformly points to the central axis of the load according to the natural frequency requirement of the vibration isolation system. The upper and lower connection plates of the annular metal rubber vibration isolator are fixed with the base and the load platform through mounting screws.
The invention has the advantages that:
(1) the annular metal rubber vibration isolator is simple in structure, light in weight and small in size.
(2) The invention utilizes the characteristic that the radial rigidity of the cylindrical metal rubber is smaller than the axial rigidity, so that the radial direction of the cylindrical metal rubber is the same as the gravity direction of the precise load, the vibration isolation level of the vibration isolation system in the vertical direction is improved, and the bearing capacity of the system in the horizontal direction is improved.
(3) According to the annular metal rubber vibration isolator, the cylindrical metal rubber is radially compressed through the arc-shaped pressing plate and the adapter plate, and meanwhile, the movement of the annular metal rubber relative to the adapter plate is limited through the positioning pipe, so that on one hand, the metal rubber structure is not required to be damaged to fix the annular metal rubber vibration isolator, and the vibration isolation effect is ensured; on the other hand, the arc-shaped pressing plate is in curved surface contact with the inner side of the cylindrical metal rubber, so that the metal rubber and the arc-shaped pressing plate are effectively prevented from being abraded due to mutual friction in the working process, and the service lives of the vibration isolator and the vibration isolation system are prolonged.
(4) The vibration isolation system is flexible in composition and convenient and fast to install, and the number and the installation direction of the annular metal rubber vibration isolators can be designed according to actual loads.
(5) The invention adopts all-metal materials, and has good high-low temperature performance and high reliability.
Drawings
FIG. 1 is a schematic perspective view of the annular metal rubber vibration isolator of the present invention;
FIGS. 2a and 2b show a layout of the vibration isolation system provided by the present invention, that is, a plurality of annular metal rubber vibration isolators are uniformly distributed along the circumference, and the central symmetry axes of the annular metal rubber vibration isolators are uniformly distributed along the tangential direction of the installation circumference;
FIG. 3 is a schematic structural diagram of a vibration isolation system according to the present invention, in which a plurality of annular metal rubber vibration isolators are circumferentially and uniformly distributed, and the central symmetry axes of the annular metal rubber vibration isolators are uniformly directed to the central axis of the load;
fig. 4a and 4b show a layout of the vibration isolation system provided by the invention, namely, a plurality of annular metal rubber vibration isolators are arranged in a square matrix, and the central symmetry axis direction of the annular metal rubber vibration isolators is along the system X direction (direction 2) or Y direction (direction 1).
In the figure:
1-upper connection plate 2-lower connection plate 3-positioning tube
4-arc pressing plate 5-cylindrical metal rubber
7-thin-head screw 8-load platform 9-annular metal rubber vibration isolator
10-base
Detailed Description
The invention is described in detail below with reference to the drawings and specific examples. The following examples are presented to assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any manner. It should be noted that variations and modifications such as the layout of the annular metal rubber isolator in the mounting plane and the orientation of the central symmetry axis, which are within the scope of the invention, may be made by those skilled in the art without departing from the spirit of the invention.
Referring to fig. 1-4 b, the invention relates to an annular metal rubber vibration isolator and a vibration isolation system thereof.
As shown in fig. 1, the annular metal rubber vibration isolator comprises an upper connection plate 1, a lower connection plate 2, a positioning pipe 3, an arc-shaped pressing plate 4, cylindrical metal rubber 5, a spring washer and a thin-head screw 7. The position connection relationship is as follows: two arc clamp plates 4 are relatively installed on the inner side of the cylindrical metal rubber 5, are respectively fixed with the upper rotary joint plate 1 and the lower rotary joint plate 2 through thin head screws 7, spring washers and positioning pipes 3, and compress the cylindrical metal rubber 5. The compression degree of the cylindrical metal rubber can be adjusted by adjusting the screwing depth of the thin head screw 7 relative to the upper and lower connection plates and the height of the positioning pipe 3.
As shown in fig. 2a-4b, the vibration isolation system of the annular metal rubber vibration isolator comprises an annular metal rubber vibration isolator 9, a base 10 and a load platform 8. The position connection relationship is as follows: a plurality of annular metal rubber vibration isolators 5 are arranged between the base 10 and the load platform 8, and the upper connection plate 1 and the lower connection plate 2 of the annular metal rubber vibration isolators 9 are fixed with the base 10 and the load platform 8 through mounting screws. The central symmetry axis of the annular metal rubber vibration isolator 9 is parallel to the plane of the base 10 and the loading platform 8, and the position and the direction of the central symmetry axis in the plane are determined by the actual design space and the loading requirement of the vibration isolation system. The annular metal rubber vibration isolators can be uniformly distributed along the circumference or arranged in a square matrix, and for the circumferentially distributed arrangement form, the central symmetry axes of the annular metal rubber vibration isolators can be uniformly tangential along the installation circumference (shown in figures 2a-2b) or uniformly point to the central axis of the load (shown in figure 3). For the square matrix arrangement, the central symmetry axis direction of the annular metal-rubber vibration isolator can be along the X direction (figure 4a-4 b-direction 2) or the Y direction (figure 4a-4 b-direction 1) of the system.
The working process of the vibration isolator of the embodiment is as follows: because the upper connecting plate 1, the positioning pipe 3 and the arc-shaped pressing plate 4 compress and fix the cylindrical metal rubber 5, each annular metal rubber vibration isolator is a six-degree-of-freedom passive vibration isolation system. When the base 10 is interfered by a single direction, the relative displacement exists between the load platform 8 and the base 10, so that the cylindrical metal rubber 5 in the annular metal rubber vibration isolator 9 deforms along the displacement direction, and meanwhile, the resistance is provided for the movement of the precise load tending to the interference direction, the vibration energy is reduced, and the stability is kept. Similarly, in a complex vibration environment, the cylindrical metal rubbers 5 at each position in the vibration isolation system deform along with the relative displacement between the load platform 8 and the base 10, so that the vibration interference transmitted from the base 10 to the load platform 8 is attenuated, and the requirement of precise load on stable working environment is met.
The above-described embodiment is only one implementation of the inventive concept. The attachment of the annular metal rubber isolator to the base and the load platform can be in a variety of other ways depending on the application environment. For example, when the vibration level is small, the connection of the three can be simplified, and one embodiment is that the circular arc-shaped receiving grooves which are adapted to the shape of the circumference of the metal rubber can be arranged on one sides of the upper and lower connection plates facing the cylindrical metal rubber, so that parts of the upper and lower parts of the metal rubber are respectively positioned in the circular arc-shaped receiving grooves, and the upper and lower connection plates are respectively fixedly connected with the load platform and the base. In another embodiment, the upper adapter plate and the lower adapter plate can be omitted, and the circular arc-shaped bearing grooves are directly formed in the base and the load platform. With the bearing groove, the metal rubber does not slide relative to the base or the load platform, the relative movement between the base and the load platform can be limited, and the vibration isolation with six degrees of freedom can be better realized.
In the case of a large vibration level, for example, when the vibration isolation system is applied to the aerospace field, the fixed connection among the metal rubber, the base and the loading platform needs to be maintained, and various alternatives may be made to the fastening manner (which may be preferable) of the illustrated embodiment of the present invention, for example, the upper side and the lower side of the metal rubber are respectively fixed to the loading platform and the base by bolts and nuts, or fixed to the upper connecting plate and the lower connecting plate in the case of the upper connecting plate and the lower connecting plate. This document is not to be taken as a excrescence.
The vibration isolation system utilizes the characteristic that the radial rigidity of the cylindrical metal rubber 5 is lower than the axial rigidity, and reduces the vertical inherent frequency of the system on the premise of ensuring the bearing capacity through the parallel connection of a plurality of cylindrical metal rubber vibration isolators 9, thereby effectively improving the vibration isolation level of the vibration isolation system in the vertical direction; meanwhile, by reasonably designing the thickness of the cylindrical metal rubber 5 along the central symmetry axis direction and the installation direction and position of the annular metal rubber vibration isolator 9, the lateral natural frequency of the system can be designed on the basis of ensuring the horizontal bearing capacity of the system, and the lateral vibration isolation level of the vibration isolation system is improved.
Claims (6)
1. The utility model provides a take annular metal rubber isolator's vibration isolation system which characterized in that: the vibration isolator comprises a base, a load platform and at least three annular metal rubber vibration isolators, and is characterized in that the annular metal rubber vibration isolators are uniformly distributed along the circumference or are arranged between the base and the load platform in a square matrix manner; the central symmetry axis of the annular metal rubber vibration isolator is parallel to the plane of the base and the load platform,
the annular metal rubber vibration isolator comprises cylindrical metal rubber, an upper connecting plate and a lower connecting plate, the upper connecting plate is connected with the cylindrical metal rubber and the load platform, the lower connecting plate is connected with the cylindrical metal rubber and the base,
the annular metal rubber vibration isolator consists of an arc-shaped pressing plate, a positioning pipe, an upper connecting plate, a lower connecting plate, cylindrical metal rubber, a thin-head screw and a spring washer; the arc-shaped pressing plate is positioned on the inner side of the cylindrical metal rubber, the upper connecting plate and the lower connecting plate are positioned on the outer side of the cylindrical metal rubber, and the positioning pipes are positioned on the cylindrical end surfaces on the two sides of the cylindrical metal rubber; the cylindrical metal rubber is pressed tightly through the arc-shaped pressing plate, the upper connecting plate, the lower connecting plate, the thin-head screws and the spring washers, and the cylinder end faces on the two sides of the cylindrical metal rubber are positioned through the positioning pipes penetrating through the thin-head screws.
2. The vibration isolation system according to claim 1, wherein: the position and the direction of the central symmetry axis of the metal rubber vibration isolator in the vibration isolation system are determined by the actual design space and the load requirement of the vibration isolation system.
3. The vibration isolation system according to claim 1, wherein: the center symmetry axes of a plurality of metal rubber vibration isolators in the vibration isolation system in the circumferentially and uniformly distributed mode are uniformly directed to the central axis of the load along the tangential direction of the installation circumference or uniformly.
4. The vibration isolation system according to claim 1, wherein: the arc-shaped pressing plate is a long-strip-shaped stainless steel plate with two long sides tilted towards the inner side of the cylindrical metal rubber.
5. The vibration isolation system according to claim 1, wherein: the upper connecting plate and the lower connecting plate are provided with bearing grooves which are adaptive to the circumferential surface of the metal rubber on one side facing the cylindrical metal rubber.
6. The vibration isolation system according to claim 1, wherein: the upper connecting plate and the lower connecting plate are provided with corresponding threaded holes and are fixed with the base and the load platform through mounting screws.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910668747.7A CN110486405B (en) | 2019-07-23 | 2019-07-23 | Vibration isolation system with annular metal rubber vibration isolator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910668747.7A CN110486405B (en) | 2019-07-23 | 2019-07-23 | Vibration isolation system with annular metal rubber vibration isolator |
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| CN110486405A CN110486405A (en) | 2019-11-22 |
| CN110486405B true CN110486405B (en) | 2020-11-27 |
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| CN201910668747.7A Active CN110486405B (en) | 2019-07-23 | 2019-07-23 | Vibration isolation system with annular metal rubber vibration isolator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113251101A (en) * | 2021-05-13 | 2021-08-13 | 哈尔滨工业大学（深圳） | Elliptical ring vibration isolator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| LU65416A1 (en) * | 1971-05-26 | 1973-01-22 | ||
| CN2575368Y (en) * | 2001-12-18 | 2003-09-24 | 陶勇 | Double conical disc type magnetic rheological transmission mechanism |
| CN102410329B (en) * | 2011-09-10 | 2014-04-02 | 中国兵器工业第二〇六研究所 | Compound vibration-isolating and buffering device |
| CN205173329U (en) * | 2015-11-10 | 2016-04-20 | 中国飞机强度研究所 | Annular metal rubber vibration isolator |
| CN207213010U (en) * | 2017-09-15 | 2018-04-10 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | The flat ring-shaped rubber vibration isolator of small size |
| CN208778558U (en) * | 2018-09-25 | 2019-04-23 | 石家庄距龙盘科技有限公司 | A kind of small-sized vibration isolator of metal-rubber |
| CN109737165A (en) * | 2019-01-03 | 2019-05-10 | 兰州空间技术物理研究所 | Rigidity vibration isolators and the vibrating isolation systems such as a kind of three axis of all-metal |
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