CN117869502A - Rigidity-adjustable passive vibration isolation system - Google Patents
Rigidity-adjustable passive vibration isolation system Download PDFInfo
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- CN117869502A CN117869502A CN202410125356.1A CN202410125356A CN117869502A CN 117869502 A CN117869502 A CN 117869502A CN 202410125356 A CN202410125356 A CN 202410125356A CN 117869502 A CN117869502 A CN 117869502A
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- ring
- vibration isolation
- rigidity
- isolation system
- mounting ring
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- 238000002955 isolation Methods 0.000 title claims abstract description 38
- 230000007246 mechanism Effects 0.000 claims abstract description 49
- 239000006096 absorbing agent Substances 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000005693 optoelectronics Effects 0.000 abstract description 5
- 238000003384 imaging method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000012938 design process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Abstract
The invention relates to a rigidity-adjustable passive vibration isolation system, and belongs to the technical field of photoelectric equipment. The problem that the shock absorber in the prior art cannot achieve a good vibration reduction effect on low-frequency vibration and is not easy to adjust is solved. The rigidity-adjustable passive vibration isolation system comprises a connecting piece, an upper mounting ring, a bearing flange, a negative rigidity adjusting mechanism, an adjusting ring, a positive rigidity adjusting mechanism and a lower mounting ring which are coaxially arranged. The rigidity-adjustable passive vibration isolation system is constructed based on the quasi-zero rigidity principle, is connected in series with the positive rigidity adjusting mechanism through the negative rigidity adjusting mechanism, and is connected with the upper mounting ring, the adjusting ring and the lower mounting ring in a threaded manner, so that lower natural frequency is provided, and meanwhile, the vibration isolation system has higher bearing capacity, is suitable for being used by an optoelectronic platform, and particularly meets the vibration isolation requirements of high bearing and low rigidity of an aviation optoelectronic platform.
Description
Technical Field
The invention belongs to the technical field of photoelectric equipment, and particularly relates to a rigidity-adjustable passive vibration isolation system which is particularly suitable for aviation photoelectric platforms.
Background
The optoelectronic device is susceptible to the working environment of the platform (aircraft, ship, car, etc.) carrying it during operation, wherein the influence is greatly the vibration of the platform during traveling, such as the vibration caused by air flow during the flight of the aircraft, the vibration generated by the aircraft engine, etc. Therefore, in the design process of the photoelectric equipment, in order to improve the stability of the photoelectric equipment and eliminate the influence of vibration on the imaging of the photoelectric equipment, the vibration which has larger influence on the photoelectric equipment needs to be attenuated to a smaller magnitude by using a vibration absorber, so that the imaging performance of the photoelectric equipment is improved.
Vibration damper in the prior art can attenuate vibration received by photoelectric equipment to a certain extent, but cannot meet the requirements of aviation photoelectric equipment at the present stage. The reasons are mainly as follows:
on the one hand, the vibration frequency band of the aviation photoelectric platform is wide from low frequency 10Hz to high frequency 2000Hz, the vibration amplitude of the low frequency range is large, the imaging effect of the photoelectric equipment is affected, the vibration energy of the high frequency range is strong, and the service life of the photoelectric equipment is affected, but the vibration absorber only has a damping effect after the disturbance frequency of system vibration is larger than the self frequency of the vibration absorber, so that the vibration of the low frequency range cannot be well damped;
on the other hand, the shock absorber has a large influence on the imaging effect of the aviation photoelectric platform, in the actual use process, the shock absorber cannot be adjusted according to different characteristics of each photoelectric device, most of the design of the existing shock absorber is calculated preliminarily through theory, and verification is carried out in a test mode, so that the development cost of the photoelectric device is improved, and the development period of the photoelectric device is prolonged.
Disclosure of Invention
The invention aims to solve the problems that a shock absorber in the prior art cannot achieve a good shock absorption effect on low-frequency vibration and is not easy to adjust, and provides a rigidity-adjustable passive vibration isolation system which has high bearing capacity, low natural frequency (low rigidity) and adjustable rigidity.
The technical scheme adopted by the invention for solving the technical problems is as follows.
The invention provides a rigidity-adjustable passive vibration isolation system which comprises a connecting piece, an upper mounting ring, a bearing flange, a negative rigidity adjusting mechanism, an adjusting ring, a positive rigidity adjusting mechanism and a lower mounting ring which are coaxially arranged;
the upper mounting ring is a cylinder with an opening at the bottom end, a mounting hole is formed in the top surface, and external threads are formed on the outer surface of the side wall;
the lower mounting ring consists of a bottom plate, an inner ring and an outer ring, the inner ring and the outer ring are coaxially arranged and fixed on the bottom plate, and the outer wall of the outer ring is provided with external threads;
the adjusting ring is hollow and cylindrical, the upper part and the lower part of the inner wall of the adjusting ring are respectively provided with internal threads, the internal threads are respectively matched with external threads on the side wall of the upper mounting ring and external threads arranged on the outer wall of the outer ring of the lower mounting ring, and a plurality of fixing plates are fixed in the middle part of the inner wall of the adjusting ring;
the connecting piece is cylindrical and is fixed in the mounting hole of the upper mounting ring, the top end of the connecting piece extends out of the upper mounting ring, and the bottom end of the connecting piece extends into the upper mounting ring;
the bearing sleeve of the bearing flange is fixed outside the bottom end of the connecting piece;
the top end of the positive rigidity adjusting mechanism is fixedly connected with the bottom end of the connecting piece, and the bottom end of the positive rigidity adjusting mechanism is fixed in the inner circular ring of the lower mounting ring;
the negative rigidity adjusting mechanisms are more than three and are circumferentially and uniformly distributed, the top ends of the negative rigidity adjusting mechanisms are fixed on the flange of the bearing flange, and the bottom ends of the negative rigidity adjusting mechanisms are fixed on the fixing plate.
Further, scales are arranged on the outer surface of the side wall of the upper mounting ring.
Further, a plurality of screw holes are formed in the edge of the bottom plate.
Further, an adjusting hole is formed in the bottom plate in the inner ring.
Furthermore, the outer wall of the outer ring is provided with scales.
Further, the connecting piece is provided with an axial through hole.
Further, the negative rigidity adjusting mechanism and the positive rigidity adjusting mechanism are springs.
Further, the spring is a coil spring, a belleville spring or a wire rope spring.
Further, the number of the fixing plates is the same as that of the negative rigidity adjusting mechanisms, the negative rigidity adjusting mechanisms are uniformly distributed on the circumference, each negative rigidity adjusting mechanism is fixed on one fixing plate, the outer outline of the fixing plate is formed by an arc and a space between two ends of the connecting arc, and the arc side is fixed on the inner wall of the adjusting ring.
Compared with the prior art, the invention has the beneficial effects that:
1. the rigidity-adjustable passive vibration isolation system is constructed based on the quasi-zero rigidity principle, and the negative rigidity adjusting mechanism is connected with the positive rigidity adjusting mechanism in series, so that lower natural frequency is provided, and meanwhile, the vibration isolation system has higher bearing capacity, is suitable for being used by an optoelectronic platform, and particularly meets the vibration isolation requirements of high bearing and low rigidity of an aviation optoelectronic platform.
2. The rigidity-adjustable passive vibration isolation system has an adjusting function within a certain range, can be adjusted and used according to the performances of different photoelectric platforms, meets the requirement of multi-rigidity adjustment of the photoelectric equipment platform in the installation and debugging process, expands the application range and provides convenience for installation of the vibration isolation system of the photoelectric platform.
3. According to the rigidity-adjustable passive vibration isolation system, scales can be arranged to serve as rigidity indication marks, the rigidity-adjustable passive vibration isolation system can be adjusted for bearing systems with different rigidities, the use efficiency in the design process of a photoelectric platform is improved, and as the inherent frequency of each device of the photoelectric platform has a certain difference, the adaptability of a single vibration isolation system can be improved through adjusting the rigidities, and the imaging capability of the photoelectric device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a stiffness adjustable passive vibration isolation system of the present invention;
FIG. 2 is a schematic view of the structure of the upper mounting ring of the present invention;
FIG. 3 is a schematic view of the lower mounting ring of the present invention;
FIG. 4 is a schematic structural view of an adjusting ring according to the present invention;
in the figure, 1, a connecting piece, 2, an upper mounting ring, 2-1, a mounting hole, 3, a bearing flange, 4, a negative rigidity adjusting mechanism, 5, an adjusting ring, 5-1, a fixing plate, 6, a positive rigidity adjusting mechanism, 7, a lower mounting ring, 7-1, a bottom plate, 7-2, an inner circular ring, 7-3, an outer circular ring, 7-4 and an adjusting hole.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below, but it is to be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
The rigidity-adjustable passive vibration isolation system comprises a connecting piece 1, an upper mounting ring 2, a bearing flange 3, a negative rigidity adjusting mechanism 4, an adjusting ring 5, a positive rigidity adjusting mechanism 6 and a lower mounting ring 7 which are coaxially arranged;
the upper mounting ring 2 is a cylinder with an opening at the bottom end, the top surface is provided with a mounting hole 2-1, and the outer surface of the side wall is provided with external threads; the lower mounting ring 7 consists of a bottom plate 7-1, an inner ring 7-2 and an outer ring 7-3, wherein the inner ring 7-2 and the outer ring 7-3 are coaxially arranged on the bottom plate 7-1, and the outer wall of the outer ring 7-3 is provided with external threads; the adjusting ring 5 is hollow and cylindrical, the upper part and the lower part of the inner wall of the adjusting ring 5 are respectively provided with internal threads, the internal threads are respectively matched with external threads on the side wall of the upper mounting ring 2 and external threads on the outer wall of the outer circular ring 7-3 of the lower mounting ring 7, and a plurality of fixing plates 5-1 are fixed in the middle of the inner wall of the adjusting ring 5; the connecting piece 1 is cylindrical and is fixed in a mounting hole 2-1 of the upper mounting ring 2, the top end of the connecting piece extends out of the upper mounting ring 2, and the bottom end of the connecting piece extends into the upper mounting ring 2; the bearing sleeve of the bearing flange 3 is fixed outside the bottom end of the connecting piece 1; the top end of the positive rigidity adjusting mechanism 6 is fixedly connected with the bottom end of the connecting piece 1, and the bottom end is fixed in the inner circular ring 7-2 of the lower mounting ring 7; the negative rigidity adjusting mechanisms 4 are more than three and are circumferentially and uniformly distributed, the top ends of the negative rigidity adjusting mechanisms are fixed on the flange of the bearing flange 3, and the bottom ends of the negative rigidity adjusting mechanisms are fixed on the fixing plate 5-1.
In the above technical scheme, the outer surface of the side wall of the upper mounting ring 2, the outer wall of the lower mounting ring 7 and the outer wall of the adjusting ring 5 can be provided with scales, and the scales can be calibrated according to the positions of the scales in the process of adjusting the bearing and natural frequencies of the vibration isolation system, so that the vibration isolation system is convenient to adjust.
In the above technical scheme, the bearing flange 3 is in the prior art, the inner ring is a bearing, the outer ring is a flange, the two are coaxially arranged and fixedly connected, and the bearing drives the flange to rotate.
In the above technical scheme, the bottom plate 7-1 in the inner ring 7-2 of the lower mounting ring 7 is provided with the adjusting hole 7-4, so that the relative position of the lower mounting ring 7 and the adjusting ring 5 can be conveniently adjusted.
In the above technical scheme, the edge of the bottom plate 7-1 is provided with a plurality of screw holes for fixing the lower mounting ring 7.
In the above technical scheme, the connecting piece 1 can be provided with an axial through hole, and an internal thread can be arranged in the axial through hole for connecting with other elements, and the internal thread is specifically arranged according to actual needs.
In the above-described embodiments, the plurality of negative stiffness adjusting mechanisms 4 are fixed in a generally inclined manner from top to bottom from inside to outside.
In the above technical solution, the number of the fixing plates 5-1 is preferably the same as that of the negative stiffness adjusting mechanisms 4, and the negative stiffness adjusting mechanisms 4 are circumferentially and uniformly distributed, each negative stiffness adjusting mechanism 4 is fixed on one fixing plate 5-1, the outer contour of the fixing plate 5-1 is formed by an arc and a space connecting two ends of the arc, and the arc side is fixed on the inner wall of the adjusting ring 5.
In the above technical solution, the negative stiffness adjusting mechanism 4 may be a negative stiffness generating system formed by a coil spring, a belleville spring, a wire rope spring (in a stretched state) and other elastic materials. The positive stiffness adjusting mechanism 6 can also be a negative stiffness generating system formed by a spiral spring, a belleville spring, a wire rope spring (in a compressed state) and other elastic materials.
In the technical scheme, the upper mounting ring 2 is connected with the adjusting ring 5 through threads, and the supporting angle and the rigidity of the negative rigidity adjusting mechanism 4 are changed by adjusting the position between the upper mounting ring 2 and the adjusting ring 5; after the supporting angle and the rigidity of the negative rigidity adjusting mechanism 4 are changed, the supporting force of the negative rigidity adjusting mechanism 4 and the bearing capacity of the vibration isolation system are adjusted. The lower mounting ring 7 is connected with the adjusting ring 5 through threads, the pre-pressure of the spring 6 is changed by adjusting the position between the lower mounting ring 7 and the adjusting ring 5, and the bearing capacity and the natural frequency of the vibration isolation system are adjusted. Through the negative rigidity adjusting mechanism 4 and the positive rigidity adjusting mechanism 6, the natural frequency of the vibration isolation system can be reduced on the basis of improving the bearing capacity of the vibration isolation system, and the vibration attenuation capacity of the vibration isolation system to a carrier (other bearing mechanisms) is improved, so that the vibration isolation system has better adaptability. The vibration isolation system of the invention is suitable for various application scenes, including but not limited to aviation photoelectric platforms.
It should be apparent that the above embodiments are merely examples for clarity of illustration and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (9)
1. The rigidity-adjustable passive vibration isolation system is characterized by comprising a connecting piece (1), an upper mounting ring (2), a bearing flange (3), a negative rigidity adjusting mechanism (4), an adjusting ring (5), a positive rigidity adjusting mechanism (6) and a lower mounting ring (7) which are coaxially arranged;
the upper mounting ring (2) is a cylinder with an opening at the bottom end, the top surface is provided with a mounting hole (2-1), and the outer surface of the side wall is provided with external threads;
the lower mounting ring (7) consists of a bottom plate (7-1), an inner ring (7-2) and an outer ring (7-3), wherein the inner ring (7-2) and the outer ring (7-3) are coaxially arranged and fixed on the bottom plate (7-1), and external threads are arranged on the outer wall of the outer ring (7-3);
the adjusting ring (5) is hollow and cylindrical, internal threads are respectively arranged on the upper part and the lower part of the inner wall of the adjusting ring (5), and are respectively matched with external threads on the side wall of the upper mounting ring (2) and external threads arranged on the outer wall of the outer ring (7-3) of the lower mounting ring (7), and a plurality of fixing plates (5-1) are fixed in the middle of the inner wall of the adjusting ring (5);
the connecting piece (1) is cylindrical and is fixed in the mounting hole (2-1) of the upper mounting ring (2), the top end of the connecting piece extends out of the upper mounting ring (2), and the bottom end of the connecting piece extends into the upper mounting ring (2);
the bearing of the bearing flange (3) is sleeved and fixed outside the bottom end of the connecting piece (1);
the top end of the positive rigidity adjusting mechanism (6) is fixedly connected with the bottom end of the connecting piece (1), and the bottom end is fixed in the inner circular ring (7-2) of the lower mounting ring (7);
the negative rigidity adjusting mechanisms (4) are more than three and are circumferentially and uniformly distributed, the top ends of the negative rigidity adjusting mechanisms are fixed on the flange of the bearing flange (3), and the bottom ends of the negative rigidity adjusting mechanisms are fixed on the fixing plate (5-1).
2. The stiffness adjustable passive vibration isolation system according to claim 1, wherein the outer surface of the side wall of the upper mounting ring (2) is provided with graduations.
3. The stiffness adjustable passive vibration isolation system according to claim 1, characterized in that the edge of the bottom plate (7-1) is provided with screw holes.
4. The stiffness adjustable passive vibration isolation system according to claim 1, characterized in that the bottom plate (7-1) in the inner circular ring (7-2) is provided with an adjusting hole (7-4).
5. A passive vibration isolation system with adjustable stiffness according to claim 1, characterized in that the outer wall of the outer ring (7-3) is provided with graduations.
6. The stiffness adjustable passive vibration isolation system according to claim 1, wherein the connecting member (1) is provided with an axial through hole.
7. The stiffness adjustable passive vibration isolation system according to claim 1, wherein the negative stiffness adjustment mechanism (4) and the positive stiffness adjustment mechanism (6) are both springs.
8. The passive vibration isolation system of claim 7, wherein the spring is a coil spring, a belleville spring, or a wire rope spring.
9. The rigidity-adjustable passive vibration isolation system according to claim 1, wherein the number of the fixing plates (5-1) is the same as that of the negative rigidity adjusting mechanisms (4), and the negative rigidity adjusting mechanisms (4) are uniformly distributed circumferentially, each negative rigidity adjusting mechanism (4) is fixed on one fixing plate (5-1), the outer contour of the fixing plate (5-1) is formed by an arc and a space connecting two ends of the arc, and the arc side is fixed on the inner wall of the adjusting ring (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410125356.1A CN117869502A (en) | 2024-01-30 | 2024-01-30 | Rigidity-adjustable passive vibration isolation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410125356.1A CN117869502A (en) | 2024-01-30 | 2024-01-30 | Rigidity-adjustable passive vibration isolation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117869502A true CN117869502A (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410125356.1A Pending CN117869502A (en) | 2024-01-30 | 2024-01-30 | Rigidity-adjustable passive vibration isolation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117869502A (en) |
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2024
- 2024-01-30 CN CN202410125356.1A patent/CN117869502A/en active Pending
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