CN108799405B - Zero-rigidity vibration isolation device without angular displacement - Google Patents
Zero-rigidity vibration isolation device without angular displacement Download PDFInfo
- Publication number
- CN108799405B CN108799405B CN201810689796.4A CN201810689796A CN108799405B CN 108799405 B CN108799405 B CN 108799405B CN 201810689796 A CN201810689796 A CN 201810689796A CN 108799405 B CN108799405 B CN 108799405B
- Authority
- CN
- China
- Prior art keywords
- support frame
- vibration isolation
- zero
- connecting piece
- isolation device
- 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
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
- 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
-
- 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
- F16F2228/06—Stiffness
-
- 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
- F16F2228/06—Stiffness
- F16F2228/063—Negative stiffness
-
- 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
- F16F2238/00—Type of springs or dampers
- F16F2238/02—Springs
- F16F2238/026—Springs wound- or coil-like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a zero-rigidity vibration isolation device without angular displacement, which comprises an upper support frame, a lower support frame and a middle support frame arranged between the upper support frame and the lower support frame; the upper support frame and the lower support frame are respectively of a square frame structure, and every two adjacent frames in the upper support frame and the lower support frame are respectively connected through a connecting piece; the middle support frame comprises four middle connecting pieces which are respectively distributed on the top point of the square, and every two adjacent middle connecting pieces are connected through a spring connecting mechanism. In the zero-stiffness vibration isolation device without angular displacement, a brand-new passive vibration isolation device is designed by utilizing the principle that positive and negative stiffness springs are connected in parallel to generate zero stiffness and introducing the design principle of no angular displacement, wherein the zero-stiffness device can realize the ultralow-frequency vibration isolation effect of the vibration isolation device, and the zero-stiffness device can greatly reduce the swinging displacement of a vibration-isolated object, so that the vibration isolation effect in the vertical and horizontal X, Y directions is realized.
Description
Technical Field
The invention belongs to the field of zero-rigidity vibration isolation, and particularly relates to a zero-rigidity vibration isolation device without angular displacement.
Background
With the continuous development of satellite technology, the precision of various test and measurement instruments on a satellite is higher and higher, so that the requirements of the test and measurement instruments on the surrounding environment are higher and higher in the ground test process, and the requirements are the requirements on the vibration environment.
The rigidity is an important design index in the design of the vibration isolation device, the bearing capacity of the vibration isolation device can be improved by increasing the total rigidity of the vibration isolation device, the inherent frequency can be reduced by reducing the total rigidity, so that the vibration isolation interval of the vibration isolation device can be increased, the ultralow frequency vibration isolation effect is realized, but the vibration isolation frequency can be reduced by increasing the vibration isolation interval by using the vibration isolation device with lower rigidity, and meanwhile, the static displacement of the vibration isolation device is increased. In the ground test process of various test and measurement instruments on actual satellites, the vibration frequency is usually in the range of 0.5 Hz-70 Hz, especially for low-frequency interference lower than 2Hz, the natural frequency of a traditional vibration isolation system is usually difficult to be lower than 2Hz, and the lower the natural frequency is, the problems of structural instability or overlarge static deformation and the like can be encountered. By combining the factors, the vibration isolation device with positive and negative rigidity connected in parallel can effectively solve the problems, the positive rigidity can provide enough bearing capacity for the vibration isolation device, the vibration isolation device has strong stability, and the negative rigidity connected in parallel can reduce the total rigidity of the device, so that the problem of isolating ultralow frequency vibration of the traditional passive vibration isolation system is solved.
Disclosure of Invention
In view of the above, the present invention is directed to a zero-stiffness vibration isolation device without angular displacement, so as to achieve ultra-low frequency vibration isolation for an object and minimize the amount of swinging displacement of the object.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a zero-rigidity vibration isolation device without angular displacement comprises an upper support frame and a lower support frame which are arranged oppositely, and a middle support frame arranged between the upper support frame and the lower support frame;
the upper support frame and the lower support frame are respectively of a square frame structure, every two adjacent frames in the upper support frame are connected through an upper connecting piece, every two adjacent frames in the lower support frame are connected through a lower connecting piece, and the upper connecting piece and the corresponding lower connecting piece are connected and supported through a first spring;
the middle support frame comprises four middle connecting pieces which are arranged in a square shape, and every two adjacent middle connecting pieces are connected through a spring connecting mechanism;
each middle connecting piece and the corresponding upper connecting piece as well as the middle connecting piece and the corresponding lower connecting piece are respectively connected through a hinge rod, two hinge rods corresponding to each middle connecting piece are arranged in equal length, and the two hinge rods and the corresponding first springs form an isosceles triangle supporting structure with a variable included angle.
Furthermore, the spring connecting mechanism comprises a second spring and connecting shafts respectively connected with the two ends of the second spring, the second spring is in a compressed state, and the outer end of each connecting shaft is connected with the corresponding middle connecting piece.
Furthermore, each second spring is equipped with the sleeve outward in the activity cover, and the sleeve articulates there is the bracing piece, and this bracing piece outer end articulates on the corresponding frame of lower carriage.
Furthermore, the supporting rod is hinged at the middle position of the sleeve.
Furthermore, the upper connecting piece, the lower connecting piece and the middle connecting piece are respectively of a connecting corner piece structure.
Compared with the prior art, the zero-rigidity vibration isolation device without angular displacement has the following advantages:
in the zero-stiffness vibration isolation device without angular displacement, a brand-new passive vibration isolation device is designed by utilizing the principle that positive and negative stiffness springs are connected in parallel to generate zero stiffness and introducing the design principle of no angular displacement, wherein the zero-stiffness device can realize the ultralow-frequency vibration isolation effect of the vibration isolation device, and the zero-stiffness device can greatly reduce the swinging displacement of a vibration-isolated object, so that the vibration isolation effect in the vertical and horizontal X, Y directions is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the zero-stiffness vibration isolation device without angular displacement;
FIG. 2 is a schematic perspective view of the zero-stiffness vibration isolation device without angular displacement;
FIG. 3 is a perspective view of the middle support frame of the device;
fig. 4 is a schematic view of a spring connection mechanism in the intermediate support frame.
Description of reference numerals:
1-lower support frame; 102-a lower connector;
103-a first spring; 2-intermediate support frame;
201-a connecting shaft; 202-intermediate connectors;
203-a second spring; 204-support rods;
205-a hinged lever; 206-a sleeve;
3-upper support frame; 302-upper connection.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 2, a zero-stiffness vibration isolation device without angular displacement comprises an upper support frame 3, a lower support frame 1 and a middle support frame 2, wherein the upper support frame 3, the lower support frame 1 and the middle support frame 2 are respectively of a square frame structure, the upper support frame 3 and the lower support frame 1 are arranged oppositely, the middle support frame 2 is arranged in the middle of the upper support frame 3 and the lower support frame 1, and four vertexes of the middle support frame 2 correspond to four vertexes of the upper support frame 3 one by one; every two adjacent frames in the upper support frame 3 are connected through an upper connecting piece 302, every two adjacent frames in the lower support frame 1 are connected through a lower connecting piece 102, in the embodiment, the frames of the upper support frame 3 and the lower support frame 1 are respectively in a shaft structure, and the upper connecting piece 302 and the corresponding lower connecting piece 102 are connected and supported through a first spring 103; the middle support frame 3 comprises four middle connecting pieces 202 which are respectively distributed on the same square vertex, and every two adjacent middle connecting pieces 202 are connected through a spring connecting mechanism; each of the middle connectors 202 and its corresponding upper connector 302, and the middle connectors 202 and their corresponding lower connectors 102 are connected by a hinge rod 205, and the two hinge rods 205 corresponding to each of the middle connectors 202 are arranged with equal length. The working principle of the embodiment is shown in fig. 1, in the intermediate support frame 2, because every two adjacent intermediate connecting pieces 202 are connected through the spring connecting mechanism, the intermediate support frame 2 is a square structure with variable side length, the structure can realize the movement in two directions (X direction and Y direction) in the horizontal plane, and can simultaneously obtain the same deformation value in the transverse direction and the longitudinal direction (X direction and Y direction), so that the characteristics of equal stiffness in the plane are generated, and the spring mechanisms among the intermediate connecting pieces 202 are extruded in the front, back, left and right directions (X direction and Y direction), so that the side length of the square is changed to generate the shock insulation effect; in the device, the upper support frame 3 and the lower support frame 1 are connected and supported by the first spring, so as to realize the vertical shock absorption effect, meanwhile, for the middle support frame 2, the upper support frame 3 and the lower support frame 1, the two hinged rods 205 corresponding to each middle connecting piece 202 and the first spring 103 corresponding to the middle support frame 202 form an isosceles triangle structure with a variable included angle, the structure has the mechanism characteristics of constant waist length and variable included angle, the whole vibration isolation device totally adopts four sets of isosceles triangle structures, so that the four sets of isosceles triangle structure layouts form a mutually perpendicular cross structure, the isosceles triangle structures connecting four opposite angles of the whole vibration isolation device are connected, wherein the upper connecting four points form an orthorhombic structure with an unchangeable side length, namely the upper support frame 3 in the embodiment, the lower connecting four points form an orthorhombic structure with an unchangeable side length, namely, in the lower support frame 1 of the embodiment, the upper regular quadrilateral structure is used for forming a support platform capable of bearing an object to be vibration-isolated, the lower regular quadrilateral structure is used for forming a support platform capable of bearing the whole vibration-isolating device and the object to be vibration-isolated, for the whole vibration-isolating device, three regular quadrilateral structures, namely an upper support frame 3, a middle support frame 2 and a lower support frame 1 are arranged, the side length of the upper regular quadrilateral structure is unchangeable, the side length of the middle regular quadrilateral structure is changeable, the three regular quadrilateral structures adopt a horizontal and mutually parallel arrangement scheme, when the vibration-isolating movement starts, the three regular quadrilateral structures are always mutually parallel and do not have angular displacement movement, the angular displacement-free design can well inhibit the angular displacement movement of the vibration-isolating device, the first spring 103 is arranged in the opposite side direction of the variable included angle in the isosceles triangle structure, namely the vertical direction (Z direction), the first spring 103 can bear the mass characteristic of an object to be subjected to vibration isolation, the first spring 103 is extruded in the vertical direction (Z direction), and the mode of changing the included angle of an isosceles triangle is changed to generate a positive stiffness effect. In the middle support frame 2, the spring connecting mechanism between every two adjacent middle connecting pieces 202 generates a negative stiffness effect, and the positive stiffness and the negative stiffness are arranged in parallel, so that zero-stiffness shock insulation effect is realized.
In this embodiment, as shown in fig. 4, the spring connection mechanism includes a second spring 203 and connection shafts 201 connected to two ends of the second spring 203, the second spring 203 is in a compressed state at an initial state, and an outer end of each connection shaft 201 is connected to a corresponding intermediate connection member 202. Because the initial state of the second spring 203 is a compressed state, the initial state of the first spring 103 is a stretched state, so that the upper support frame and the lower support frame form a positive stiffness support structure, the middle support frame 2 is a negative stiffness structure, and the positive stiffness support structure and the negative stiffness structure jointly act to realize the shock insulation effect on an object supported by the upper support frame 3.
In this embodiment, as shown in fig. 2 and fig. 3, a sleeve 206 is movably sleeved outside each second spring 203, the sleeve 206 is hinged to a support rod 204 at the middle, and the outer end of the support rod 204 is hinged to the corresponding frame of the lower support frame 1. The arrangement of the sleeve 206 ensures the linearity of the deformation of the second spring 203, and prevents the second spring 203 from popping up due to the deformation, thereby improving the shock insulation effect of the middle support frame.
In this embodiment, the upper connecting member 302, the lower connecting member 102 and the middle connecting member 202 are respectively of a connecting corner fitting structure.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A zero-rigidity vibration isolation device without angular displacement comprises an upper support frame (3) and a lower support frame (1) which are arranged oppositely, and a middle support frame (3) arranged between the upper support frame (3) and the lower support frame (1); the method is characterized in that:
the upper support frame (3) and the lower support frame (1) are respectively of a square frame structure, every two adjacent frames in the upper support frame (3) are connected through an upper connecting piece (302), every two adjacent frames in the lower support frame (1) are connected through a lower connecting piece (102), and the upper connecting piece (302) and the corresponding lower connecting piece (102) are connected and supported through a first spring (103);
the middle support frame (3) comprises four middle connecting pieces (202) which are arranged in a square shape, and every two adjacent middle connecting pieces (202) are connected through a spring connecting mechanism;
each middle connecting piece (202) and the corresponding upper connecting piece (302) thereof and each middle connecting piece (202) and the corresponding lower connecting piece (102) thereof are respectively connected through a hinge rod (205), two hinge rods (205) corresponding to each middle connecting piece (202) are arranged in equal length, and the two hinge rods (205) and the corresponding first springs (103) thereof form an isosceles triangle supporting structure with a variable included angle.
2. The zero-stiffness vibration isolation device without angular displacement according to claim 1, wherein: the spring connecting mechanism comprises a second spring (203) and connecting shafts (201) which are respectively connected with two ends of the second spring (203), and the outer end of each connecting shaft (201) is connected with a corresponding middle connecting piece (202).
3. The zero-stiffness vibration isolation device without angular displacement according to claim 2, wherein: the second spring (203) is in a compressed state.
4. The zero-stiffness vibration isolation device without angular displacement according to claim 2, wherein: each second spring (203) is movably sleeved with a sleeve (206), the sleeve (206) is hinged with a support rod (204), and the outer end of the support rod (204) is hinged on the corresponding frame of the lower support frame (1).
5. The zero-stiffness vibration isolation device without angular displacement according to claim 4, wherein: the supporting rod (204) is hinged at the middle position of the sleeve (206).
6. The zero-stiffness vibration isolation device without angular displacement according to claim 1, wherein: the upper connecting piece (302), the lower connecting piece (102) and the middle connecting piece (202) are respectively of a connecting corner piece structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810689796.4A CN108799405B (en) | 2018-06-28 | 2018-06-28 | Zero-rigidity vibration isolation device without angular displacement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810689796.4A CN108799405B (en) | 2018-06-28 | 2018-06-28 | Zero-rigidity vibration isolation device without angular displacement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108799405A CN108799405A (en) | 2018-11-13 |
| CN108799405B true CN108799405B (en) | 2019-12-27 |
Family
ID=64072586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810689796.4A Active CN108799405B (en) | 2018-06-28 | 2018-06-28 | Zero-rigidity vibration isolation device without angular displacement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108799405B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109404464B (en) * | 2018-12-12 | 2020-05-26 | 哈尔滨工业大学 | Pendulum type high static low dynamic vibration isolator |
| WO2020264146A1 (en) * | 2019-06-25 | 2020-12-30 | Arizona Board Of Regents On Behalf Of Arizona State University | Mechanical metamaterials as an energy shield |
| CN110332270B (en) * | 2019-07-23 | 2021-10-26 | 广州大学 | Folding quasi-zero rigidity vibration isolation device |
| US11964384B2 (en) | 2020-09-30 | 2024-04-23 | Arizona Board Of Regents On Behalf Of Arizona State University | Curved origami-based metamaterials for in situ stiffness manipulation |
| CN112211952A (en) * | 2020-10-12 | 2021-01-12 | 哈尔滨工程大学 | Low-frequency large-stroke quasi-zero rigidity vibration isolation device |
| CN112555317B (en) * | 2020-12-17 | 2022-08-26 | 哈尔滨工程大学 | Quasi-zero rigidity vibration isolation platform suitable for ultralow frequency vibration isolation |
| CN113883215B (en) * | 2021-08-24 | 2023-01-31 | 故宫博物院 | Combined three-dimensional shock isolation device suitable for floating object protection |
| CN115823174A (en) * | 2022-11-11 | 2023-03-21 | 长春工业大学 | Multilayer tension structure damping platform mechanism with negative rigidity characteristic |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858402B (en) * | 2010-06-11 | 2011-07-27 | 中国兵器工业第二○五研究所 | Three-way irrotational displacement absorber |
| CN101871505B (en) * | 2010-06-12 | 2012-07-04 | 江苏大学 | Positive and negative stiffness parallel three-translation vibration and impact isolation platform |
| CN201834213U (en) * | 2010-10-09 | 2011-05-18 | 浙江师范大学 | Double-parallelogram non-angular displacement vibration damper |
| CN202133856U (en) * | 2011-05-31 | 2012-02-01 | 上海微电子装备有限公司 | Vibration damping platform |
| CN103307195B (en) * | 2013-05-20 | 2015-04-15 | 华中科技大学 | Three-degree-of-freedom ultralow frequency vibration absorber |
| CN103453062B (en) * | 2013-08-15 | 2015-06-17 | 华中科技大学 | Zero-rigidity magnetic-suspension active vibration isolator and six-degree-of-freedom vibration isolation system consisting of vibration isolator |
| CN103511549B (en) * | 2013-08-19 | 2016-03-02 | 燕山大学 | A kind of irrotational displacement parallel-connection vibration reduction device |
| CN103807353B (en) * | 2014-02-18 | 2015-08-12 | 河南科技大学 | Irrotational displacement isolation mounting and side chain thereof |
| CN104154170B (en) * | 2014-08-01 | 2016-08-24 | 安徽工程大学 | A kind of multi-dimensional damping platform based on parallel institution |
| GB2533943B (en) * | 2015-01-07 | 2020-09-23 | Bae Systems Plc | Improvements in and relating to electromechanical actuators |
| CN105299133B (en) * | 2015-12-08 | 2017-05-31 | 天津航天机电设备研究所 | A kind of positive and negative Stiffness mechanism |
| CN106402267B (en) * | 2016-05-23 | 2018-07-17 | 福州大学 | Drawing quasi-zero stiffness vibration isolators and its implementation |
| CN105864339B (en) * | 2016-06-01 | 2017-11-17 | 福州大学 | A kind of quasi-zero stiffness vibration isolators and its implementation for being applied to isolate low-frequency vibration a little |
| CN106402229B (en) * | 2016-06-20 | 2018-05-08 | 南京航空航天大学 | A kind of scissors quasi-zero stiffness vibration isolators and its method of work |
| CN105972147B (en) * | 2016-07-12 | 2018-03-06 | 安徽工程大学 | The adjustable quasi- zero stiffness vibration-isolating platform of positive negative stiffness |
| CN106051014B (en) * | 2016-07-12 | 2018-08-17 | 安徽工程大学 | Multidimensional can harmonize zero stiffness vibration-isolating platform |
| CN106812866B (en) * | 2017-01-12 | 2018-10-02 | 中国航空工业集团公司北京航空材料研究院 | A kind of Three Degree Of Freedom irrotational displacement shock resistance platform |
| CN108131411B (en) * | 2017-12-29 | 2019-06-28 | 浙江理工大学 | A kind of sensing Nonlinear Quasi zero stiffness electromagnetism vibration isolator certainly |
-
2018
- 2018-06-28 CN CN201810689796.4A patent/CN108799405B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108799405A (en) | 2018-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108799405B (en) | Zero-rigidity vibration isolation device without angular displacement | |
| KR101929149B1 (en) | Inertia measurement module and three-axis accelerometer | |
| CN103317498B (en) | Folding type five-degree-of-freedom parallel connected attitude adjustment platform | |
| US9879417B2 (en) | Rigidity-controllable seismic-isolation support utilizing gravitational negative rigidity | |
| CN105247334A (en) | Device and method for determining inertia properties of an object | |
| CN114934974A (en) | Large-amplitude horizontal two-degree-of-freedom vibration isolator | |
| CN102401080B (en) | Three-dimensional antique vibration isolation device with limit protection system | |
| CN110531478A (en) | A kind of various dimensions precision vibration isolation optical platform | |
| CN107797217A (en) | Projection objective support meanss and photoetching machine equipment | |
| CN110778649A (en) | Three-degree-of-freedom parallel vibration isolation platform with quasi-zero rigidity characteristic | |
| CN212810060U (en) | Level formula antidetonation power capacitor | |
| CN112555317B (en) | Quasi-zero rigidity vibration isolation platform suitable for ultralow frequency vibration isolation | |
| CN115126810A (en) | Spring-connecting rod vertical rigidity-variable shock insulation support | |
| CN114810923A (en) | Vibration isolation device | |
| CN212561137U (en) | Road and bridge damping support | |
| CN212298178U (en) | Shock attenuation platform of engineering reconnaissance instrument | |
| CN113323979A (en) | Quasi-zero stiffness vibration isolator with unstability simply supported beam as positive stiffness bearing element | |
| CN108386471B (en) | Single-degree-of-freedom horizontal quasi zero stiffness vibration isolating mechanism | |
| CN216003055U (en) | Unmanned aerial vehicle with descending shock-absorbing function | |
| CN211855389U (en) | Portable environment monitoring instrument | |
| CN221002077U (en) | Anti-seismic reinforcing structure is built in room | |
| CN215928918U (en) | Anti-vibration structure for building safety monitoring device | |
| CN115388117A (en) | Horizontal quasi-zero stiffness vibration isolator | |
| CN215342948U (en) | Antenna element mounting base with buffer structure | |
| CN215334867U (en) | Anti-seismic connecting component of electromechanical equipment |
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 |