Inverted pendulum type quasi-zero stiffness vibration isolator capable of isolating large-amplitude low-frequency vibration

Abstract

The invention relates to an inverted pendulum type quasi-zero stiffness vibration isolator capable of isolating large-amplitude low-frequency vibration. The inverted pendulum type quasi-zero stiffnessvibration isolator comprises a bottom plate, wherein a vertical plate extends upwards from the middle of the bottom plate, an inverted pendulum is mounted on the vertical plate and swings front and back relative to the bottom plate, reset mechanisms are symmetrically mounted at positions, in front of and behind the inverted pendulum, of the bottom plate, and a surrounding plate is mounted along the edge of the bottom plate; the top of the inverted pendulum is of a gear structure, wherein a top plate is matched with the gear structure and is in front-back sliding connection with the surrounding plate, and equipment to be subjected to vibration isolation is mounted on the top plate; the equipment vibrates to drive the top plate to move relative to the surrounding plate along a guide groove,the top plate drives the inverted pendulum to swing and deviate from a balance position through rack-gear meshing, and a torsional spring in the reset mechanism applies force to a reset plate to provide inverted pendulum resetting force. The inverted pendulum type quasi-zero stiffness vibration isolator can meet large-amplitude low-frequency vibration isolation requirements, is wide in quasi-zerorigidity range, has good low-frequency vibration isolation performance and can achieve a good vibration reduction effect on 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 ...

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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

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