CN-121977042-A - Quasi-zero stiffness vibration isolator and application method thereof

CN121977042ACN 121977042 ACN121977042 ACN 121977042ACN-121977042-A

Abstract

The application discloses a quasi-zero stiffness vibration isolator and a use method thereof, wherein the quasi-zero stiffness vibration isolator comprises a support frame, a negative stiffness component and a positive stiffness component, the negative stiffness component comprises a cosine beam, two ends of the cosine beam are respectively connected with the support frame through a first adjusting component, the first adjusting component can drive the end part of the cosine beam to move along a first direction so as to adjust the cross length of a cross shaft of the cosine beam, one end of the positive stiffness component is connected with the middle part of the cosine beam, the other end of the positive stiffness component is connected with the support frame through a second adjusting component, the second adjusting component can drive the positive stiffness component to move along a second direction so as to enable the positive stiffness component and the negative stiffness component to form quasi-zero stiffness, and the first direction and the second direction are perpendicular. The quasi-zero stiffness vibration isolator can generate a plurality of different quasi-zero stiffness force platforms, so that the same quasi-zero stiffness vibration isolator can adapt to vibration isolation requirements of a plurality of different loads, and the application range of the quasi-zero stiffness vibration isolator in actual engineering is widened.

Inventors

DONG YING
HUANG SHIQING
ZHENG YIQIAN
WANG ZHIWEI
LI HAO
ZHONG WEIWEN
Tang Tengfa

Assignees

暨南大学

Dates

Publication Date: 20260505
Application Date: 20260204

Claims (10)

1. A quasi-zero stiffness vibration isolator, comprising: A support frame; the negative stiffness assembly comprises a cosine beam, two ends of the cosine beam are respectively connected with the support frame through a first adjusting assembly, and the first adjusting assembly can drive the end part of the cosine beam to move along a first direction so as to adjust the cross shaft span length of the cosine beam; The positive rigidity assembly, the one end of positive rigidity assembly with cosine beam's middle part is connected, the other end of positive rigidity assembly through the second adjusting part with the support frame is connected, the second adjusting part can drive positive rigidity assembly second direction removes, so that positive rigidity assembly with negative rigidity assembly forms the quasi zero rigidity, wherein, first direction with the second direction sets up perpendicularly.
2. The quasi-zero stiffness vibration isolator according to claim 1, wherein the first adjustment assembly comprises a first adjustment member detachably connected to an end of the cosine beam and a second adjustment member having one end threaded through the support bracket to the first adjustment member to adjust the position of the first adjustment member in the first direction.
3. The quasi-zero stiffness vibration isolator according to claim 2, wherein the support frame is provided with a first adjustment slot, at least a portion of the first adjustment member being disposed within the first adjustment slot, the first adjustment member being provided with a first scale for indicating a distance the first adjustment member moves in the first direction.
4. The quasi-zero stiffness vibration isolator according to claim 2, wherein the first adjustment assembly is provided with a connecting slot, the cosine beam is provided with a connecting block, and the connecting block is clamped with the connecting slot.
5. The quasi-zero stiffness vibration isolator according to claim 1, wherein a connecting rod is provided at the bottom of the cosine beam, the positive stiffness component comprises an elastic member and a mounting member, one side of the elastic member along the second direction is sleeved on the outer side of the connecting rod, the other side of the elastic member along the second direction is placed in the mounting member, and the mounting member is connected with the second adjusting component.
6. The quasi-zero stiffness vibration isolator according to claim 5, wherein the second adjustment assembly comprises a third adjustment member and a fourth adjustment member, the third adjustment member being coupled to the mounting member, one end of the fourth adjustment member passing through the support bracket and being threadably coupled to the third adjustment member to adjust the position of the third adjustment member in the second direction.
7. The quasi-zero stiffness vibration isolator according to claim 6, wherein the support frame is provided with a second adjustment slot, at least a portion of the third adjustment member being disposed within the second adjustment slot, the third adjustment member being provided with a second scale for indicating a distance the third adjustment member moves in the second direction.
8. The quasi-zero stiffness vibration isolator of claim 5 wherein the mounting member is provided with a mounting slot and wherein at least a portion of the elastomeric member is disposed within the mounting slot.
9. The quasi-zero stiffness vibration isolator according to claim 1, wherein the negative stiffness assembly further comprises a support platform connected to a middle portion of the cosine beam and disposed on one side of the cosine Liang Yuanli positive stiffness assembly.
10. A method of using a quasi-zero stiffness vibration isolator according to any one of claims 1 to 9, comprising the steps of: designing a target weight m, the thickness t of the cosine beam and the span length of a single-side transverse shaft of the cosine beam according to a target load And the arch height h of the midpoint position of the cosine Liang Hengzhou, wherein the height-to-thickness ratio of the cosine beam initial structure ; According to the formula Calculating to obtain dimensionless parameters , wherein, , ∈[0,1), P 0 is the axial force applied by precompression, P 1 is the first-order buckling critical force, E is the elastic modulus, and I is the section moment of inertia of the cosine beam cross section; according to the dimensionless parameters Sum formula Calculating to obtain precompression quantity c; adjusting the first adjustment assembly according to the pre-compression amount, moving the end of the cosine beam in the first direction by c/2; according to the dimensionless parameters Sum formula Calculating to obtain the lifting height H' of the positive stiffness component moving along the second direction; the second adjustment assembly is adjusted such that the end of the positive stiffness assembly connected to the second adjustment assembly moves in the second direction H'.

Description

Quasi-zero stiffness vibration isolator and application method thereof Technical Field The application relates to the technical field of vibration isolation equipment, in particular to a quasi-zero stiffness vibration isolator and a using method thereof. Background Vibration control is a key technology for improving the working performance of precision instruments and equipment and ensuring the safety and reliability of the structure. Conventional linear isolators, based on vibration theory, only when the frequency of the external excitation is greater than the natural frequency of the systemWhen the vibration isolation system is doubled, the vibration isolation effect can be achieved, so that the inherent contradiction exists between the vibration isolation frequency band and the bearing capacity, and the vibration isolation system is difficult to be suitable for low-frequency vibration isolation. In order to solve the technical problems, the prior quasi-zero stiffness vibration isolation technology with high static and low dynamic is adopted, the quasi-zero stiffness vibration isolator generally adopts a structural form of parallel combination of a positive stiffness mechanism and a negative stiffness mechanism, and the dynamic stiffness of the whole structure near the balance position is enabled to be close to zero through the stiffness cooperative compensation of the two mechanisms, so that the isolation of low-frequency vibration is realized. However, after the geometric parameters of the existing quasi-zero stiffness vibration isolator are fixed, the mechanical response of the existing quasi-zero stiffness vibration isolator is also fixed, so that the existing quasi-zero stiffness vibration isolator cannot adapt to various different loads, and the application range of the quasi-zero stiffness vibration isolator in practical engineering is limited. Disclosure of Invention The present application aims to solve at least one of the above technical problems in the prior art. Therefore, the application aims to provide the quasi-zero stiffness vibration isolator which can generate a plurality of different quasi-zero stiffness force platforms, realize that the same quasi-zero stiffness vibration isolator can adapt to vibration isolation requirements of a plurality of different loads, and widen the application range of the quasi-zero stiffness vibration isolator in practical engineering. The application also provides a using method based on the quasi-zero stiffness vibration isolator. A quasi-zero stiffness vibration isolator according to an embodiment of the first aspect of the present application comprises: A support frame; the negative stiffness assembly comprises a cosine beam, two ends of the cosine beam are respectively connected with the support frame through a first adjusting assembly, and the first adjusting assembly can drive the end part of the cosine beam to move along a first direction so as to adjust the cross shaft span length of the cosine beam; The positive rigidity assembly, the one end of positive rigidity assembly with cosine roof beam's middle part is connected, the other end of positive rigidity assembly through the second adjusting part with the support frame is connected, the second adjusting part can drive positive rigidity assembly removes along the second direction, so that positive rigidity assembly with negative rigidity assembly forms the quasi zero rigidity, wherein, first direction with the second direction sets up perpendicularly. The quasi-zero stiffness vibration isolator has the advantages that at least two ends of a cosine beam are respectively connected with a support frame through a first adjusting component, the first adjusting component can drive the end part of the cosine beam to move along a first direction so as to adjust the arch height of the cosine beam and further change the peak load of a negative stiffness component, meanwhile, one end of a positive stiffness component is connected with the middle part of the cosine beam, the other end of the positive stiffness component is connected with the support frame through a second adjusting component, the second adjusting component can drive the positive stiffness component to move along a second direction so as to adjust the position of the positive stiffness component, and the negative stiffness of the cosine beam and the positive stiffness of the positive stiffness component are cooperatively matched to form quasi-zero stiffness, so that the stiffness of the quasi-zero stiffness vibration isolator at the balance position is close to zero, and isolation of low-frequency vibration can be achieved. In addition, through the collaborative adjustment of the first adjusting component and the second adjusting component, the matching relation between the negative stiffness component and the positive stiffness component can be changed, so that the quasi-zero stiffness vibration isolator can generate a plurality of different q