CN112780716A - Stewart vibration isolation platform with double-layer vibration isolation supporting legs - Google Patents
Stewart vibration isolation platform with double-layer vibration isolation supporting legs Download PDFInfo
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- CN112780716A CN112780716A CN202110053378.8A CN202110053378A CN112780716A CN 112780716 A CN112780716 A CN 112780716A CN 202110053378 A CN202110053378 A CN 202110053378A CN 112780716 A CN112780716 A CN 112780716A
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- vibration isolation
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- piston rod
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- 238000002955 isolation Methods 0.000 title claims abstract description 70
- 239000002184 metal Substances 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000013016 damping Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/228—Damping of high-frequency vibration effects on spacecraft elements, e.g. by using acoustic vibration dampers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
- B64G1/00—Cosmonautic vehicles
- B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
- B64G1/24—Guiding or controlling apparatus, e.g. for attitude control
- B64G1/38—Guiding or controlling apparatus, e.g. for attitude control damping of oscillations, e.g. nutation dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Radar, Positioning & Navigation (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a Stewart vibration isolation platform with double-layer vibration isolation supporting legs, which comprises an upper platform, a lower platform and six double-layer vibration isolation supporting leg units, wherein three pairs of hooke hinge connecting pieces are arranged on the upper platform and the lower platform in a triangular mode, the distance between the hooke hinge connecting pieces and the axial lead of the upper platform and the axial lead of the lower platform is equal, each hooke hinge connecting piece on the upper platform is connected with two hooke hinges on the lower platform through the two double-layer vibration isolation supporting leg units, each double-layer vibration isolation supporting leg unit sequentially comprises an upper piston rod, an O-shaped sealing ring, an upper metal spiral spring, a cylindrical shell, a lower metal spiral spring, an O-shaped sealing ring and a lower piston rod from top to bottom, and the telescopic movement of the piston rod. The invention has simple structure and strong replaceability, is suitable for the field of vibration isolation of various spatial structures, realizes the effect superposition of the Stewart platform with excellent vibration isolation performance and a double-layer vibration isolation system, and has the total effect greatly exceeding the maximum 45dB vibration level drop of the previous single vibration isolation system.
Description
Technical Field
The invention relates to a Stewart vibration isolation platform with double-layer vibration isolation supporting legs, and belongs to the field of passive control vibration isolation.
Background
With the development of science and technology, the problem of multidimensional vibration has become a main factor influencing the performance and service life of various mechanical equipment, precision instruments and meters, vehicles, ships, aviation, aerospace and other related equipment, so that multidimensional vibration isolation becomes a technical problem which needs to be solved urgently at home and abroad.
With the entering of the spacecraft into the high-precision era, in order to meet the vibration mechanics environment required by the normal work of high-precision satellite-borne equipment, the micro-vibration dynamics environment generated by operating equipment during the on-orbit operation of the spacecraft is firstly measured and analyzed. Numerous scholars and organizations both at home and abroad make a great deal of research on the micro-vibration dynamic environment of the spacecraft during the in-orbit operation.
Because the Stewart platform has the characteristics of large rigidity-mass ratio, strong bearing capacity, high motion precision and the like, the micro-vibration of the spacecraft is a multi-degree-of-freedom vibration environment, space sensitive equipment generally needs multi-degree-of-freedom vibration isolation, for example, the imaging quality of a space high-resolution camera is sensitive to three-axis vibration and three-axis attitude vibration, and a six-degree-of-freedom vibration isolation platform is needed. Therefore, the six-degree-of-freedom vibration isolation platform based on the Stewart mechanism is widely applied to the problem of spacecraft vibration isolation.
Therefore, the six-degree-of-freedom vibration isolation platform of the Stewart mechanism is optimized, the vibration isolation performance of the Stewart mechanism is improved, the application of the Stewart mechanism in more vibration isolation fields is explored, and the method has important significance for the development of the Stewart vibration isolation platform.
Disclosure of Invention
The purpose of the invention is to increase the vibration isolation amount of the traditional Stewart vibration isolation platform, so that the Stewart vibration isolation platform has more excellent vibration isolation performance.
The purpose of the invention is realized as follows: including two upper and lower platforms and six double-deck vibration isolation landing leg units, all be triangle-shaped on two upper and lower platforms and arrange and be provided with three pairs of hooke hinge connecting piece, and hooke hinge connecting piece equals apart from the axial lead distance of upper and lower platform, every hooke hinge connecting piece on the upper mounting plate is connected with two hooke hinges on the lower platform through two double-deck vibration isolation landing leg units, and every double-deck vibration isolation landing leg unit from the top down comprises last piston rod, O type sealing washer, last metal coil spring, cylinder casing, lower metal coil spring, O type sealing washer, lower piston rod in proper order, the activity of piston rod telescopic restrict in the cylinder casing.
The invention also includes such structural features:
1. the upper piston rod, the O-shaped sealing ring, the upper metal spiral damping spring, the cylindrical shell, the lower metal spiral spring, the O-shaped sealing ring and the lower piston rod on each double-layer vibration isolation supporting leg unit have the same axial lead.
Compared with the prior art, the invention has the beneficial effects that: the parallel connection of a plurality of double-layer vibration isolation system structures in a smaller space can be realized, the six-degree-of-freedom vibration isolation is realized by adopting the double-layer vibration isolation system structure, and higher additional damping can be provided compared with the traditional vibration isolator; every two adjacent double-layer vibration isolation support leg units in the vibration isolator can form a stable geometric invariant system together with the upper platform and the lower platform, so that the vibration isolator integrally forms a stable structural system, and internal forces in all directions generated by complex loads can be borne; simple structure, replaceability are strong, are applicable to multiple spatial structure vibration isolation field. Most importantly, the effect superposition of the Stewart platform with excellent vibration isolation performance and the double-layer vibration isolation system is realized, and the overall effect can greatly exceed the maximum 45dB vibration level drop capacity of the previous single vibration isolation system.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of a double-layer vibration isolation leg unit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In order that the advantages and features of the invention will be readily understood, a more particular description of embodiments of the invention will be rendered by reference to the appended drawings.
The invention provides a Stewart vibration isolation platform with double-layer vibration isolation supporting legs, which is shown in a figure 1 and a figure 2 and comprises an upper platform 1, a hooke joint 2, a piston rod 3, an O-shaped sealing ring 4, a metal spiral spring 5, a cylindrical shell 6 and a lower platform 7; the Hooke hinge connecting pieces 2 are six pairs, three pairs of Hooke hinge connecting pieces 2 are respectively arranged on the upper platform 1 and the lower platform 7, the three pairs of Hooke hinge connecting pieces 2 arranged on the upper platform 1 and the lower platform 7 are distributed in a triangular shape, and the distances from the axial lines of the platforms are equal; the piston rod 3, the O-shaped sealing ring 4, the metal spiral spring 5 and the cylindrical shell 6 are arranged coaxially to form a double-layer vibration isolation supporting leg unit which is arranged vertically and symmetrically; the double-layer vibration isolation supporting leg units are six in number, and each double-layer vibration isolation supporting leg unit is arranged between the upper platform and the lower platform through a Hooke hinge connecting piece.
In this embodiment, the lower hinge of each pair of hooke hinge connecting pieces 2 on the upper platform 1 is respectively connected to one end of two double-layer vibration isolation supporting leg units, the other ends of the two double-layer vibration isolation supporting legs are connected to two hooke hinges on the lower platform, and so on, and finally the schematic structural diagram of the Stewart vibration isolation platform with the double-layer vibration isolation supporting legs shown in fig. 1 is formed.
Specifically, every two adjacent double-layer vibration isolation support legs and the upper platform and the lower platform can form a stable geometric invariant system, so that the vibration isolator integrally forms a stable structural system, and the vibration isolator can bear multi-dimensional internal force generated by complex vibration.
Specifically, the piston rod, the metal coil spring and the cylindrical shell on each double-layer vibration isolation supporting leg unit have the same axial lead. Each rod member has a local coordinate system arranged along its axis. Because the two ends of each double-layer vibration isolation supporting leg inside the double-layer vibration isolation supporting leg are Hooke joints, bending moment can be released; therefore, each double-layer vibration isolation supporting leg of the double-layer six-freedom-degree vibration isolator cannot bend at any time, and each double-layer vibration isolation supporting leg of the double-layer six-freedom-degree vibration isolator moves along the axis line of the double-layer six-freedom-degree vibration isolator.
Specifically, in order to meet the vibration isolation requirements of different working conditions, the metal coil springs in the double-layer vibration isolation supporting leg unit can be replaced by elastic damping elements made of other viscoelastic elements, magnetic stretching materials, shape memory alloy materials and the like.
Specifically, the Stewart vibration isolation platform with the double-layer vibration isolation supporting legs is in a spatial parallel symmetrical structure, and can be arranged at multiple angles. In the field of mechanical manufacturing or aerospace, relevant products in the structural form are all in the form of platforms for vibration isolation, so that the relevant products are vertically placed.
Claims (2)
1. A Stewart vibration isolation platform with double-layer vibration isolation supporting legs is characterized in that: including two upper and lower platforms and six double-deck vibration isolation landing leg units, all be triangle-shaped on two upper and lower platforms and arrange and be provided with three pairs of hooke hinge connecting piece, and hooke hinge connecting piece equals apart from the axial lead distance of upper and lower platform, every hooke hinge connecting piece on the upper mounting plate is connected with two hooke hinges on the lower platform through two double-deck vibration isolation landing leg units, and every double-deck vibration isolation landing leg unit from the top down comprises last piston rod, O type sealing washer, last metal coil spring, cylinder casing, lower metal coil spring, O type sealing washer, lower piston rod in proper order, the activity of piston rod telescopic restrict in the cylinder casing.
2. A Stewart isolation platform with double isolation legs as claimed in claim 1, wherein: the upper piston rod, the O-shaped sealing ring, the upper metal spiral damping spring, the cylindrical shell, the lower metal spiral spring, the O-shaped sealing ring and the lower piston rod on each double-layer vibration isolation supporting leg unit have the same axial lead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110053378.8A CN112780716A (en) | 2021-01-15 | 2021-01-15 | Stewart vibration isolation platform with double-layer vibration isolation supporting legs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110053378.8A CN112780716A (en) | 2021-01-15 | 2021-01-15 | Stewart vibration isolation platform with double-layer vibration isolation supporting legs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112780716A true CN112780716A (en) | 2021-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110053378.8A Pending CN112780716A (en) | 2021-01-15 | 2021-01-15 | Stewart vibration isolation platform with double-layer vibration isolation supporting legs |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6022005A (en) * | 1996-09-27 | 2000-02-08 | Trw Inc. | Semi-active vibration isolator and fine positioning mount |
| CN104552332A (en) * | 2015-01-22 | 2015-04-29 | 中国计量学院 | Bionic spine motion segment |
| CN104613285A (en) * | 2015-01-27 | 2015-05-13 | 北京航空航天大学 | Large dynamic cubic Stewart active vibration control platform |
| CN106028706A (en) * | 2016-06-23 | 2016-10-12 | 任祥根 | Adjustable damping bearing for intelligent power electric cabinet |
| CN106286692A (en) * | 2016-09-20 | 2017-01-04 | 华中科技大学 | A kind of six degree of freedom micro-vibration suppression platform and control method thereof |
| CN107605851A (en) * | 2017-09-18 | 2018-01-19 | 沈阳飞机工业（集团）有限公司 | Hydraulic pressure pressing sleeve device |
| CN109773727A (en) * | 2018-12-28 | 2019-05-21 | 南京理工大学 | A kind of six degree of freedom platform containing used appearance |
| CN111609081A (en) * | 2020-06-08 | 2020-09-01 | 上海大学 | Novel vibration damper based on Stewart configuration |
-
2021
- 2021-01-15 CN CN202110053378.8A patent/CN112780716A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6022005A (en) * | 1996-09-27 | 2000-02-08 | Trw Inc. | Semi-active vibration isolator and fine positioning mount |
| CN104552332A (en) * | 2015-01-22 | 2015-04-29 | 中国计量学院 | Bionic spine motion segment |
| CN104613285A (en) * | 2015-01-27 | 2015-05-13 | 北京航空航天大学 | Large dynamic cubic Stewart active vibration control platform |
| CN106028706A (en) * | 2016-06-23 | 2016-10-12 | 任祥根 | Adjustable damping bearing for intelligent power electric cabinet |
| CN106286692A (en) * | 2016-09-20 | 2017-01-04 | 华中科技大学 | A kind of six degree of freedom micro-vibration suppression platform and control method thereof |
| CN107605851A (en) * | 2017-09-18 | 2018-01-19 | 沈阳飞机工业（集团）有限公司 | Hydraulic pressure pressing sleeve device |
| CN109773727A (en) * | 2018-12-28 | 2019-05-21 | 南京理工大学 | A kind of six degree of freedom platform containing used appearance |
| CN111609081A (en) * | 2020-06-08 | 2020-09-01 | 上海大学 | Novel vibration damper based on Stewart configuration |
Non-Patent Citations (1)
| Title |
|---|
| 杨恒: "六自由度并联机构变搜索原点迭代正解方法", 《应用科技》 * |
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Application publication date: 20210511 |