Quasi-zero-stiffness vibration isolator with horizontal damper

Abstract

The invention discloses a quasi-zero-stiffness vibration isolator with a horizontal damper. Two sets of cam-roller-spring mechanisms are horizontally and symmetrically arranged to serve as a negativestiffness structure, the horizontal damper is additionally arranged, and then the negative stiffness structure, the horizontal damper and a vertical positive stiffness spring structure are connected in parallel to form a quasi-zero-stiffness vibration isolation mechanism jointly. The matched stiffness coefficients of vertical springs and horizontal springs are selected, the height of cams and thepre-compression amount of the horizontal springs are adjusted according to the mass of an object subjected to vibration isolation and the stiffness of the vertical springs, the centers of the cam androllers are made horizontally flush, and the system has the quasi-zero-stiffness feature at the balanced position. On the basis of the certain vertical damping, the horizontal damping of the system isreasonably designed, and the resonance phenomenon of the system can be restrained or even eliminated. The vibration isolator has the high-static and low-movable stiffness feature, can achieve low-frequency vibration isolation, is simple in structure and convenient to maintain, and can be widely applied to low-frequency vibration management projects.

Description

technical field [0001] The invention relates to a low-frequency or ultra-low-frequency nonlinear vibration isolation device, which has good vibration isolation effects in terms of force excitation and displacement excitation, and can be widely used in environmental vibration, precision instruments, large power units, ships, submarines, aerospace Low-frequency vibration isolation systems for aviation and flexible structures. Background technique [0002] In the field of engineering, vibration is one of the important factors that cause failures. Traditional linear stiffness vibration isolators have a good isolation effect on medium and high-frequency vibrations, but the isolation effect on low-frequency vibrations is not ideal. Only when the excitation frequency is greater than the natural frequency of the system Only when it is doubled can it have the effect of vibration isolation. Therefore, the vibration isolation system needs to reduce its own natural frequency to have ...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by this invention is to propose a quasi-zero-stiffness vibration isolator with horizontal damping for the shortcomings of linear vibration isolators that cannot have both high load capacity and excellent low-frequency vibration isolation performance

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