Shear type quasi zero rigidity vibration isolator and work method thereof

Abstract

The invention discloses a shear type quasi zero rigidity vibration isolator and a work method thereof. The shear type quasi zero rigidity vibration isolator comprises a supporting base, a positive-rigidity module, a negative-rigidity module and a supporting plate. The positive-rigidity module comprises at least one positive-rigidity unit. The negative-rigidity module comprises a first upper support, a second upper support, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod, a fifth connecting rod, a sixth connecting rod, a seventh connecting rod, an eighth connecting rod, a first lower support, a second lower support, a first horizontal connecting shaft, a second horizontal connecting shaft and at least one horizontal spring. For the defects that an existing linear vibration isolator can difficultly isolate low-frequency vibration and an existing quasi zero rigidity vibration isolator is complex in structure and short in effective stroke, the shear type quasi zero rigidity vibration isolator has high static rigidity and low dynamic stiffness based on the positive and negative rigidity parallel principle, can isolate low-frequency or ultra-low-frequency vibration and is easy to machine and achieve, high in bearing capability and high in reliability.

Description

Technical field [0001] The invention relates to a low-frequency or ultra-low frequency nonlinear vibration isolation device, in particular to a scissor-type quasi-zero stiffness vibration isolator and a working method thereof, which is suitable for vibration isolation systems such as automobiles, ships, and submarines. Background technique [0002] The ride comfort of a car is directly related to driver fatigue, discomfort and safety. Commercial vehicle drivers are often exposed to overload and harsh working environments. Drivers are mainly affected by high-amplitude low-frequency vibrations, and the natural frequencies of the main organs of the human body are distributed in the low-frequency region of 2-7 Hz, so low-frequency vibrations are a major cause of driver's health problems. The traditional seat suspension adopts linear vibration isolation technology, only when the excitation frequency is greater than the natural frequency The vibration isolation effect can be achieved...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the shortcomings of the existing linear vibration isolators that are difficult to isolate low-frequency vibrations and the existing quasi-zero stiffness vibration isolators with complex structures and short effective strokes. Based on the principle of parallel connection of positive and negative stiffnesses, a Scissor type quasi-zero stiffness vibration isolator and its working method

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