An inverted pendulum quasi-zero stiffness vibration isolator capable of isolating large-amplitude and low-frequency vibrations

Abstract

The invention relates to an inverted pendulum type quasi-zero stiffness vibration isolator capable of isolating large-amplitude low-frequency vibration. A reset mechanism is symmetrically installed on the bottom plates at the front and rear of the inverted pendulum, and a hoarding plate is installed along the edge of the bottom plate; the top of the inverted pendulum is set as a gear structure, and a top plate is installed in cooperation with the gear structure. It is used to install the equipment to be isolated from vibration; the vibration of the equipment drives the top plate to move relative to the enclosure plate along the guide groove, the top plate is driven by the rack-gear meshing to swing the inverted pendulum and deviates from the equilibrium position, and the torsion spring in the reset mechanism exerts force on the reset plate, Provides an inverted swing return force. The invention can meet the high-amplitude low-frequency vibration isolation requirements, the vibration isolator has a wide range of quasi-zero stiffness, has good low-frequency vibration isolation performance, and can play a good vibration damping effect on the horizontal vibration of the equipment.

Description

technical field [0001] The invention relates to the technical field of vibration isolation devices, in particular to an inverted pendulum quasi-zero-stiffness vibration isolator capable of isolating large-amplitude and low-frequency vibrations. Background technique [0002] Vibration isolation is to install machinery or instruments on elastic devices to isolate vibration. It is a common measure in vibration control, but the vibration isolator is only used when the excitation frequency is higher than Therefore, reducing the natural frequency of the vibration isolation system becomes a key issue in vibration control. [0003] Reducing the stiffness of the isolator can reduce the initial isolation frequency, but it cannot play a supporting role. Ideally, the vibration isolator has high static stiffness and low dynamic stiffness at the same time, which is contradictory in traditional vibration isolation systems. To solve this problem, some scholars have proposed a quasi-zero ...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, most of the common quasi-zero stiffness structures are negative stiffness structures composed of horizontal pre-compressed springs connected in parallel with positive stiffness springs, but the quasi-zero stiffness of spring-type quasi-zero stiffness structures has a small After deviating from the equilibrium position, the stiffness value increases rapidly, so the advantages of quasi-zero stiffness vibration isolation cannot be used for large-amplitude vibrations

Images