CN-122014806-A - Quasi-zero stiffness component and compact annular low-frequency vibration isolation device using same

CN122014806ACN 122014806 ACN122014806 ACN 122014806ACN-122014806-A

Abstract

The invention relates to a quasi-zero stiffness component and a compact annular low-frequency vibration isolation device using the same, which belong to the field of vibration isolators and comprise a base body, a connecting rod, a positive stiffness mechanism and a negative stiffness mechanism, wherein an installation cavity is formed in the inner side of the base body, the connecting rod is arranged in the installation cavity in a reciprocating manner along a first direction, one end of the connecting rod extends to the outer side of the base body to form a first connecting end, the positive stiffness mechanism is positioned in the installation cavity and comprises a planar elastic piece, the planar elastic piece is simultaneously connected with the connecting rod and the inner side wall of the installation cavity, the negative stiffness mechanism is positioned in the installation cavity and comprises an inner magnetic ring and an outer magnetic ring, the axis of the inner magnetic ring is overlapped with the connecting rod, the inner magnetic ring and the outer magnetic ring are arranged on the inner side of the outer magnetic ring, the inner magnetic ring and the outer magnetic ring are magnetized along the axial direction and are the same, the inner magnetic ring is fixedly sleeved on the connecting rod, and the outer magnetic ring is fixedly embedded on the inner side wall of the installation cavity. The invention realizes the low-frequency vibration suppression in the circumferential direction, and can adapt to the installation requirements of narrow space and high integration level.

Inventors

ZHOU JIAXI
ZHOU JIAHAO
WANG KAI
WANG QIANG
PAN HONGBIN

Assignees

湖南大学

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (10)

1. A quasi-zero stiffness member, comprising: the inner side of the seat body is provided with an installation cavity; The connecting rod is arranged in the mounting cavity in a reciprocating manner along a first direction, and one end of the connecting rod extends to the outer side of the seat body to form a first connecting end; The positive rigidity mechanism is positioned in the mounting cavity and comprises a plane elastic piece, the plane of the plane elastic piece is perpendicular to the first direction, and the plane elastic piece is connected with the connecting rod and the inner side wall of the mounting cavity at the same time; The negative rigidity mechanism is positioned in the mounting cavity and comprises an inner magnetic ring and an outer magnetic ring, the axes of the inner magnetic ring and the outer magnetic ring are overlapped with the connecting rod, the inner magnetic ring is configured to be positioned on the inner side of the outer magnetic ring, the inner magnetic ring and the outer magnetic ring are magnetized along the axial direction and have the same magnetizing direction, the inner magnetic ring is fixedly sleeved on the connecting rod, and the outer magnetic ring is fixedly embedded on the inner side wall of the mounting cavity.
2. The quasi zero stiffness member of claim 1 wherein an end of the seat body facing away from the first connecting end is formed with a second connecting end.
3. The quasi zero stiffness member of claim 2 wherein the second connecting end has a first mounting hole formed therein, the first mounting hole in communication with the mounting cavity, the connecting rod extending into the first mounting hole away from an end of the first connecting end and slidably connected to the first mounting hole by a linear bearing.
4. A quasi zero stiffness member as claimed in claim 1 or 3 wherein the mounting cavity is of a closed configuration, the mounting cavity being provided with a second mounting hole through which the connecting rod passes, the connecting rod being slidably connected to the second mounting hole by a linear bearing.
5. The quasi-zero stiffness component according to claim 1, wherein an annular mounting groove is formed in the inner side wall of the mounting cavity, the middle of the side wall of the annular mounting groove is recessed to form an annular embedded groove, the outer magnetic ring is fixedly embedded in the embedded groove, the inner side wall of the outer magnetic ring is flush with the side wall of the annular mounting groove to form an abutting surface, the planar elastic piece is a planar spiral spring, a first connecting ring is fixedly arranged at the inner side end of the planar spiral spring and fixedly sleeved on the connecting rod through the first connecting ring, a second connecting ring is fixedly arranged at the outer side section of the planar spiral spring, extends into the annular mounting groove and is in abutting connection with the abutting surface, gaps are formed between the second connecting ring and the two axial ends of the annular mounting groove, and a plurality of mutually-stacked annular gaskets are filled in the gaps.
6. The quasi zero stiffness member of claim 5 wherein the seat body is formed by first and second split bodies that are detachably connected to each other and the interface of the first and second split bodies passes through the embedded groove.
7. A compact annular low frequency vibration isolator comprising a quasi-zero stiffness member according to any one of claims 1 to 6.
8. The compact annular low-frequency vibration isolation device according to claim 7, wherein the vibration isolation device comprises an inner ring and an outer ring which are annular and coaxially arranged, a plurality of quasi-zero stiffness members are connected between the inner ring and the outer ring, one end of each quasi-zero stiffness member, which is away from the first connecting end, is provided with a second connecting end protruding outwards, the first connecting end and the second connecting end of each quasi-zero stiffness member are respectively pivoted to the inner ring and the outer ring, and the direction of a connecting rod of each quasi-zero stiffness member coincides with the radial direction of the inner ring.
9. The compact annular low-frequency vibration isolator according to claim 8, wherein the outer ring comprises an inner side and an outer side which are arranged inside and outside, the inner side and the outer side are both annular and coaxially arranged, a rubber cushion layer is arranged between the inner side and the outer side, the rubber cushion layer is fixedly connected with the inner side and the outer side at the same time, and the second connecting end of the quasi-zero stiffness member is hinged to the inner side.
10. The compact annular low frequency vibration isolator according to claim 8 or 9, wherein the number of quasi-zero stiffness members is even and not less than 4, and the quasi-zero stiffness members are uniformly disposed about the axis of the inner ring.

Description

Quasi-zero stiffness component and compact annular low-frequency vibration isolation device using same Technical Field The invention relates to the field of vibration isolators, in particular to a quasi-zero stiffness component and a compact annular low-frequency vibration isolator using the same. Background In the operation process of mechanical equipment, the generation of impact and vibration has the necessity, so that the structural fatigue and performance attenuation of the equipment are easily caused, the failure of a precision component is possibly caused, and the operation reliability of the device is seriously influenced. Along with the development of modern industry to high accuracy and high reliability, power devices such as motors, shafting and the like of precision instruments, medical equipment, aerospace equipment and underwater vehicles, more stringent requirements are put forward on vibration reduction and noise reduction, namely the equipment faces the core problems of low-frequency vibration energy concentration, easy initiation of structural resonance and reduction of sound stealth performance, is also constrained by heavy weight and compact installation space, and the traditional linear vibration isolation device has difficulty in meeting the use requirements because of being incapable of considering large bearing capacity and low initial vibration isolation frequency. The quasi-zero stiffness vibration isolator provides an effective technical path for solving the problems by virtue of the unique characteristic of high static stiffness supporting load and low dynamic stiffness to realize low-frequency vibration isolation, has the advantages of large bearing mass, low dynamic stiffness, no obvious resonance phenomenon, obviously better low-frequency vibration isolation performance than a linear vibration isolation system and the like, and is widely focused in the vibration reduction field in recent years. Along with the gradual perfection of the quasi-zero stiffness theory, related structural designs are continuously emerging, and most of the existing quasi-zero stiffness vibration isolators can be divided into unidirectional type and multidirectional type according to the vibration direction difference of vibration isolation objects, but obvious technical short plates exist in the two types of structures: In practical engineering application, equipment such as rotary machinery and the like is easy to generate vibration transmission in any direction in a circular way due to unbalance, imbalance and other factors, and vibration source vibration is not limited to single degree of freedom, so that the vibration isolation effect of the vibration isolator is greatly reduced. The multidirectional quasi-zero stiffness vibration isolator can cover the multi-degree-of-freedom vibration inhibition requirement, and breaks through the limitation that the unidirectional vibration isolator can only deal with unidirectional vibration to a certain extent, but the vibration isolator needs to be provided with more quasi-zero stiffness functional components, the corresponding whole structure occupies larger space, the situation that the installation space is required to be compactified by precision equipment, underwater vehicle power devices and the like is difficult to adapt, and the application of the unidirectional vibration isolator in narrow-space high-integration equipment is limited. Based on the above, the invention provides the quasi-zero stiffness component and the compact annular low-frequency vibration isolation device using the same, and the vibration isolation device constructs an annular multi-directional vibration isolation structure based on the annular distributed quasi-zero stiffness functional component, so that the uniform dispersion and the efficient attenuation of the annular vibration energy in any direction can be realized, the annular multi-degree-of-freedom vibration transmission problem of equipment such as rotary machinery can be solved, and meanwhile, the volume occupation of the integral structure of the vibration isolation device can be greatly reduced through the miniaturization and the compact design of the quasi-zero stiffness functional component, and the vibration isolation device is suitable for the use scene of narrow-space and high-integration equipment such as precise instruments and power devices. Disclosure of Invention The invention provides a quasi-zero stiffness component which comprises a base body, a connecting rod, a positive stiffness mechanism and a negative stiffness mechanism, wherein an installation cavity is formed in the inner side of the base body, the connecting rod is arranged in the installation cavity in a reciprocating manner along a first direction, one end of the connecting rod extends to the outer side of the base body to form a first connecting end used for being connected with a load, the positive stiffness mechanism is positioned in the in