Constant zero-stiffness vibration isolator

Abstract

The invention provides a constant zero-stiffness vibration isolator. The constant zero-stiffness vibration isolator comprises a fixing base, a bearing platform, compression rods, a middle block and a linear spring, wherein the linear spring is arranged between the bearing platform and the fixing base, the middle block is fixedly connected with the fixing base, one end of each compression rod is a hinged end which is hinged to the fixing base, the other end of each compression rod is a middle abutting end which movably abuts against the middle block, the bearing platform comprises an upper limiting part and a lower limiting part, each compression rod further comprises an upper abutting end and a lower abutting end, the upper abutting ends movably abut against the upper limiting parts, and the lower abutting ends movably abut against the lower limiting parts; and each compression rod is pre-compressed to be in a buckling deformation state under the common limitation of the middle block, the bearing platform and the fixing base. The vibration isolator can achieve zero rigidity in the whole stroke range, and is wide in vibration isolation range, small in size, small in additional mass and large in bearing capacity.

Description

technical field [0001] The invention belongs to the field of low-frequency or ultra-low-frequency vibration isolators, in particular to a constant quasi-zero stiffness vibration isolator. Background technique [0002] The quasi-zero-stiffness shock absorber is to connect the negative-stiffness element in parallel with the positive-stiffness original, so as to realize the zero-stiffness characteristic at the static equilibrium position. Compared with traditional linear vibration isolators (the effective vibration isolation frequency is greater than times the natural frequency, and the vibration isolation frequency range is narrow), the quasi-zero stiffness vibration isolator is proposed to achieve the characteristics of high static stiffness and low dynamic stiffness, while having a large bearing capacity, the structural deformation is small, and the vibration isolation frequency band is widened . According to different types of negative stiffness structures, the types of ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of existing quasi-zero stiffness vibration isolators such as small bearing capacity, large additional mass, large damping, and complex structure, which can only achieve quasi-zero stiffness at the balance position, the present invention provides a constant quasi-zero stiffness vibration isolator device

Images