Quasi-zero stiffness vibration isolator of oblique compression rod

Abstract

The invention discloses a quasi-zero stiffness vibration isolator of an oblique compression rod. The quasi-zero stiffness vibration isolator comprises a shell, a platform, rod bodies and a spring, wherein the platform is located on the upper part of the shell; the rod bodies comprise first ends and second ends, the first ends of the rod bodies are hinged to the platform, and the second ends of therod bodies are hinged to the shell; the widths and the thicknesses of the rod bodies are slightly smaller than the lengths of the rod bodies, and a plurality of rod bodies are symmetrically distributed around the platform; the spring comprises a first end and a second end, and the first end of the spring is connected with the platform; the second end of the spring is connected to the shell; and when no load exists on the platform, the included angle between the rod bodies and a horizontal plane is not zero. In the process of compression deformation of the rod bodies due to the load on the platform, the deformation of the rod bodies is limited to the length direction of the rod bodies, the bending deformation of the rod bodies cannot occur, that is, the deformation direction of a system ofthe quasi-zero stiffness vibration isolator of the oblique compression rod is consistent with the stress direction during bearing, and the stiffness of the system can be analyzed.

Description

technical field [0001] The invention belongs to the field of low-frequency or ultra-low-frequency vibration isolators, and in particular relates to a quasi-zero-stiffness vibration isolator of an inclined compression rod. Background technique [0002] The so-called quasi-zero stiffness shock absorber is a vibration isolation platform with high static stiffness and low dynamic stiffness. High static stiffness means high load capacity or small static load deformation, and low dynamic stiffness means low or close to zero. natural frequency. The shock absorber with this characteristic is mainly to solve the following problems caused by the traditional linear shock absorber composed of mass m and stiffness k: because the effective vibration isolation frequency of the linear shock absorber is greater than the natural frequency twice the root number (k / m The square root sign), so if a wider vibration isolation frequency range is to be obtained, the stiffness k of the linear damper...

AI Technical Summary

Problems solved by technology

The shock absorber with this characteristic is mainly to solve the following problems caused by the traditional linear shock absorber composed of mass m and stiffness k: because the effective vibration isolation frequency of the linear shock absorber is greater than the natural frequency twice the root number (k / m square root sign), so if a wide frequency range of vibration isolation is to be obtained, the stiffness k of the linear damper needs to be infinitely small (the natural frequency is closer to 0), but this will cause extremely large static deformation

Existing quasi-zero-stiffness vibration isolators have three-spring structures, buckling structures, and cam-roller structures, etc. These vibration isolators have small load capacity in the low-frequency range, large additional mass and damping, and cannot meet the requirements of spacecraft ground experiments. free border requirement

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