CN107559371B - Semi-active vibration isolator based on magneto-rheological technology - Google Patents
Semi-active vibration isolator based on magneto-rheological technology Download PDFInfo
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- CN107559371B CN107559371B CN201710801996.XA CN201710801996A CN107559371B CN 107559371 B CN107559371 B CN 107559371B CN 201710801996 A CN201710801996 A CN 201710801996A CN 107559371 B CN107559371 B CN 107559371B
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Abstract
A semi-active vibration isolator based on magneto-rheological technology uses magneto-rheological fluid for controlling vibration control of a moment gyro, a flywheel and a load finishing machine structure, can realize semi-active control, can change the damping and the rigidity of magnetic fluid by changing a magnetic field, meets the requirements of a launching section on a mechanical environment and the vibration isolation and inhibition of a rail section, and has small volume, light weight and high reliability.
Description
Technical Field
The invention relates to a vibration isolator, in particular to a semi-active vibration isolator based on a magneto-rheological technology, which is suitable for isolating and inhibiting broadband low vibration of an on-satellite actuating mechanism or a load and belongs to the technical field of spacecraft vibration isolation.
Background
With the rapid development of the fields of national military detailed investigation, accurate control of battlefield dynamics, precision guidance, attack effect evaluation and the like, the requirements on the attitude precision and stability of the satellite platform are increasingly improved, and the requirements on the vibration indexes of the platform by loads and the like are also increasingly higher. In order to reduce the vibration transmitted to the satellite platform and improve the attitude precision and stability of the satellite platform, an effective method is generally adopted to install vibration isolators between an actuating mechanism (control moment gyro) and a load and the satellite platform. The 'Hubble' space telescope transmitted in 1990, the Chandra-X-ray telescope transmitted in 1999 and the 'Weber' space telescope under construction are provided with passive vibration isolation devices on one of the disturbance sources, namely an attitude control flywheel. The EOS-AM1 satellite launched in 1999 has employed passive damping methods with viscoelastic material added to the payload mounts and active vibration isolation methods with piezoelectric actuators to reduce the vibration of the payload. TacSat2 launched in 2006 installed active and passive aggregate payload isolation devices on earth observation satellites. In order to obtain high-quality images, the WorldView-2 satellite launched in 2009 simultaneously takes vibration isolation measures for a control moment gyro and a camera.
Taking the control moment gyroscope as an example, the high-speed rotor of the control moment gyroscope generates broadband micro-amplitude vibration in the high-speed rotation process to become one of the main vibration sources on the satellite, and a vibration isolator is needed to isolate the vibration generated by the control moment gyroscope from the satellite platform. The vibration isolator product needs to have better on-orbit micro-vibration isolation performance, and needs to have lower rigidity and proper small damping; the vibration isolator is required to have better mechanical environment performance of an active section but higher rigidity and large damping; these two requirements are mutually restrictive.
The traditional vibration isolator is mainly a passive structure, mainly designs for reducing or weakening specific frequency points, and the size, the configuration and the weight of the structure are related to the vibration-isolated object. The structure has weak mechanical property capability of resisting the active section, and is difficult to consider different requirements of an on-orbit section and a transmitting section. Spanos proposes the design of an active-passive combined vibration isolator, mainly adopts the vibration isolator which takes a mechanical spring as a passive part and a voice coil motor actuator as an active part to realize six-degree-of-freedom vibration isolation of a satellite momentum wheel, can carry out vibration isolation aiming at relatively low-frequency components in vibration frequency, and can resist the mechanical influence of an active section. But the structure is relatively complex. The existing patents or the applied patents are not applied in an on-orbit manner, the technology is complex to realize, and the reliability is still to be verified.
Disclosure of Invention
The technical problem solved by the invention is as follows: the semi-active vibration isolator overcomes the defects of the prior art, changes the direction and the strength of a magnetic field by changing the current magnitude and the direction of an electromagnetic coil, thereby adjusting the damping force and the rigidity of the magnetorheological fluid, and is suitable for actuating mechanisms, loads and other products with vibration isolation requirements on a spacecraft.
The technical solution of the invention is as follows: the semi-active vibration isolator based on the magneto-rheological technology is characterized in that: the device comprises a sealing end cover, a mounting end corrugated pipe, an exciting coil, a damping plate, a connecting end corrugated pipe and a connecting end cover;
one end of the installation end corrugated pipe is fixedly connected with one end of the connection end corrugated pipe, the other end of the installation end corrugated pipe is sealed by adopting a sealing end cover, the other end of the connection end corrugated pipe is sealed by adopting a connection end cover, the installation end corrugated pipe, the connection end corrugated pipe, the sealing end cover and the connection end cover form a closed liquid filling cavity, and magnetic fluid is filled in the liquid filling cavity;
the damping plate is positioned in the liquid filling cavity and divides the liquid filling cavity into two parts;
the damping plate is provided with damping holes for the mutual exchange of the magnetic fluids in the two liquid filling cavities;
the exciting coil surrounds the corrugated pipe at the mounting end and the position corresponding to the damping plate outside the corrugated pipe at the connecting end.
Further, still include the mount pad, the mount pad is one end open-ended hollow column structure, installation end bellows and link bellows fixed mounting be in the mount pad.
The mounting seat, the mounting end corrugated pipe, the sealing end cover, the damping plate, the connecting end corrugated pipe and the connecting end cover are connected into a whole in a welding mode.
The mounting seat and the connecting end corrugated pipe are of an integrally formed structure.
The mounting base is provided with a wire outlet hole for wiring of the exciting coil.
Further, the magnetic field generator further comprises a coil protective sleeve wrapped around the exciting coil.
The damping holes are at least two.
The product of the number of the damping holes and the sectional area of a single damping hole forms a damping hole area A, the damping force F borne by the damping plate and the sectional area A of the damping plate0Satisfies the following relation:
F＝kA3/A0 1.5，
wherein k is a normal number.
The magnetic fluid is MRF-122EG magneto-rheological fluid.
Compared with the prior art, the invention has the advantages that:
(1) the invention uses the magnetic rheological liquid to control the vibration of moment gyroscope, flywheel and similar load, the structure is simple and reliable, and semi-active control can be realized. The vibration isolation device has the advantages of good vibration isolation effect and wide vibration isolation range aiming at broadband micro-amplitude vibration generated by a control moment gyroscope and a flywheel, and can realize isolation and inhibition on broadband low vibration of an on-satellite actuator or a load; meanwhile, good resistance to chemical environment can be realized;
(2) the invention designs a variable rigidity and damping structure based on the magnetorheological fluid, and the structure changes the direction and the strength of a magnetic field by changing the current magnitude and the direction of an electromagnetic coil, so as to adjust the damping force and the rigidity of the magnetorheological fluid, thereby greatly improving the pertinence and the effectiveness of vibration suppression and isolation;
(3) the variable rigidity and damping structure based on the magnetorheological fluid is designed, so that lower rigidity and proper small damping can be realized, and better on-orbit micro-vibration isolation performance is realized;
(4) the variable rigidity and damping structure based on the magnetorheological fluid is designed, so that higher rigidity and large damping can be realized, and better mechanical property of the active section resistance is realized; the problem that the vibration isolation and suppression requirements of the on-track section and the launching section are contradictory is solved;
(5) the invention designs a magnetorheological fluid sealing structure based on the corrugated pipe, and the structure can be used as a damping spring and a fluid damper under the condition that the magnetofluid fails, thereby improving the reliability.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention.
FIG. 2 is a schematic view of the magnetic fluid under different magnetic field conditions.
Detailed Description
As shown in fig. 1, the semi-active vibration isolator based on the magnetorheological technology comprises an installation seat 1, a sealing end cover 2, an installation end corrugated pipe 3, a coil protective sleeve 4, an excitation coil 5, a connection end corrugated pipe 7, a damping plate 6 and a connection end cover 8.
The mounting end corrugated pipe 3, the sealing end cover 2 and the damping plate 6 form a first liquid filling cavity, the connecting end corrugated pipe 7, the connecting end cover 8 and the damping plate 6 form a second liquid filling cavity, the first liquid filling cavity and the second liquid filling cavity are used for being filled with magnetic fluid, and typical magnetic fluid is magnetorheological fluid of model MRF-122EG provided by Lord company in America.
The damping plate 6 is provided with a damping hole, and the magnetic fluid is exchanged between the first liquid filling cavity and the second liquid filling cavity through the damping hole to generate damping. The damping holes are at least 2 and have the diameter of 1 mm. The number and diameter of the damping holes are designed as required, and when the sectional area of the damping plate 6 is determined and a large damping effect is required, the number (at least 2) and diameter of the damping holes can be reduced appropriately.
Damping force F and damping hole area (total area A of all damping holes) and sectional area A of damping plate 60The relationship is as follows:
F＝kA3/A0 1.5。
the mounting end corrugated pipe 3, the sealing end cover 2, the damping plate 6, the connecting end corrugated pipe 7 and the connecting end cover 8 are connected into a whole in a welding mode. After welding, the leak rate should be checked to ensure that the magnetic fluid does not leak during use. The elasticity of the vibration isolator is adjusted according to the wave height, the pitch and the thickness of the corrugated pipe 3 at the mounting end.
The sealing end cover 2 is provided with a sealing screw hole, the connecting end cover 8 is provided with a liquid filling hole, the liquid filling hole is used for filling magnetic fluid into the first liquid filling cavity and the second liquid filling cavity, and the first liquid filling cavity and the second liquid filling cavity are sealed by the sealing screw hole after the first liquid filling cavity and the second liquid filling cavity are filled with the magnetic fluid (in the actual operation process, the product is suggested to be vertically placed, the sealing screw hole is arranged above, the liquid filling hole is arranged below. The sealing screw hole is locked and sealed by using a self-sealing screw (the screw thread adopts 55-degree or 60-degree pipe thread, and the screw thread is coated with sealing glue), so that the leakage of the magnetic fluid is prevented.
The mounting seat 1 is used for fixing the shock absorber, and is provided with a mounting screw hole, the size of the thread of the mounting screw hole is selected according to mechanical impact during launching, and for a shock-absorbing object with the weight of about 10kg, the thread of the mounting seat 1 can be generally selected from M6 and above. The connecting end cover 8 is also provided with mounting screw holes for fixing a vibration damping object (a control moment gyro, a flywheel or other loads). The mounting cover and the connecting end corrugated pipe 7 are integrated through screws or welding (the mounting cover and the connecting end corrugated pipe 7 can also be integrated during design).
The exciting coil 5 generates current to change the internal damping characteristic of the magnetic fluid, and is designed among the mounting end corrugated pipe 3, the fastening end corrugated pipe 6 and the mounting seat 1, and the mounting seat 1 is provided with a wire outlet for the exciting coil 5 to wire.
Several operating states of the invention are described below with reference to fig. 2:
in the active section of launching, the exciting coil 5 is electrified, the rigidity of the shock absorber is increased, and damage to a shock absorbing object caused by vibration generated by a rocket is avoided, such as c) a strong magnetic field state in fig. 2.
When the vibration absorber works in an orbit, the current of the exciting coil 5 is adjusted according to the vibration condition of the star body, so that the rigidity of the vibration absorber is changed, the damping of the vibration absorber is increased, and the influence of the vibration generated by a vibration absorbing object on the star body is avoided, such as b) a weak magnetic field state in fig. 2.
If the exciting coil 5 or the circuit thereof fails, the magnetic fluid only works by the fluid property of itself and the spring property of the bellows, and the magnetic fluid has no magnetic field state as shown in a) in fig. 2.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (3)
1. The semi-active vibration isolator based on the magneto-rheological technology is characterized in that: the device comprises a sealing end cover (2), a mounting end corrugated pipe (3), an exciting coil (5), a damping plate (6), a connecting end corrugated pipe (7) and a connecting end cover (8);
one end of the installation end corrugated pipe (3) is fixedly connected with one end of the connection end corrugated pipe (7), the other end of the installation end corrugated pipe (3) is sealed by a sealing end cover (2), the other end of the connection end corrugated pipe (7) is sealed by a connection end cover (8), the installation end corrugated pipe (3), the connection end corrugated pipe (7), the sealing end cover (2) and the connection end cover (8) form a closed liquid filling cavity, and magnetic fluid is filled in the liquid filling cavity;
the damping plate (6) is positioned in the liquid filling cavity and divides the liquid filling cavity into two parts; the magnetic fluid is exchanged between the first liquid filling cavity and the second liquid filling cavity through the damping hole to generate damping;
the damping plate (6) is provided with damping holes for mutual exchange of the magnetic fluids in the two liquid filling cavities;
the exciting coil (5) is surrounded at the positions corresponding to the damping plate outside the corrugated pipe (3) at the mounting end and the corrugated pipe (7) at the connecting end;
the corrugated pipe installation structure is characterized by further comprising an installation base (1), wherein the installation base (1) is of a hollow column structure with one open end, and the installation end corrugated pipe (3) and the connection end corrugated pipe (7) are fixedly installed in the installation base (1);
the mounting seat (1), the mounting end corrugated pipe (3), the sealing end cover (2), the damping plate (6), the connecting end corrugated pipe (7) and the connecting end cover (8) are connected into a whole in a welding mode; or the mounting seat (1) and the connecting end corrugated pipe (7) are of an integrally formed structure;
the mounting seat (1) is provided with a wire outlet hole for wiring of the exciting coil (5);
the coil protection sleeve (4) is wrapped around the exciting coil (5);
the damping holes are at least two.
2. The semi-active vibration isolator based on magnetorheological technology of claim 1, wherein: the product of the number of the damping holes and the sectional area of a single damping hole forms a damping hole area A, the damping force F borne by the damping plate (6) and the sectional area A of the damping plate (6)0Satisfies the following relation:
F＝kA3/A0 1.5，
wherein k is a normal number.
3. The semi-active vibration isolator based on magnetorheological technology of claim 1, wherein: the magnetic fluid is MRF-122EG magneto-rheological fluid.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985588B (en) * | 2019-11-15 | 2020-11-20 | 北京控制工程研究所 | Variable damping vibration isolator based on ultrasonic motor adjustment |
| CN111207175B (en) * | 2020-03-13 | 2021-07-16 | 义乌市丹航科技有限公司 | Oil-gas damper for undercarriage |
| CN112231861B (en) * | 2020-10-16 | 2021-07-06 | 哈尔滨工业大学 | Cluster control moment gyroscope vibration isolation method for inhibiting attitude-adjusting resonance |
| CN112984030B (en) * | 2021-03-03 | 2022-04-19 | 重庆大学 | Magnetorheological damper with corrugated pipe deformation suction and discharge function |
| CN114607722B (en) * | 2022-03-31 | 2024-04-02 | 长光卫星技术股份有限公司 | Semi-active vibration isolation platform for micro-vibration of optical remote sensing satellite and assembly method |
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| JPH07139578A (en) * | 1993-11-12 | 1995-05-30 | Fuji Polymertech Kk | Variable damping type viscosity fluid damper |
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