A quasi-zero stiffness vibration isolation device based on a rotatable leaf spring to generate negative stiffness

By using a quasi-zero stiffness vibration isolation device with rotatable leaf springs to generate negative stiffness in urban rail transit, combined with positive stiffness components, the problem of low-frequency vibration isolation is solved, achieving low or near-zero dynamic stiffness, increasing the vibration isolation frequency range, and improving vibration isolation efficiency.

CN116877636BActive Publication Date: 2026-03-03ZHUZHOU TIMES NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202310866939.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-14
Publication Date
2026-03-03
Estimated Expiration
2043-07-14

AI Technical Summary

Technical Problem

Existing quasi-zero stiffness vibration isolation devices are difficult to apply in urban rail transit engineering, especially since negative stiffness generating devices are difficult to meet actual needs, and traditional vibration isolators are difficult to isolate low-frequency or ultra-low-frequency vibrations.

Method used

A quasi-zero stiffness vibration isolation device is formed by combining a negative stiffness component based on a rotatable leaf spring with a positive stiffness component. The negative stiffness is generated by the change of the rotatable leaf spring, which reduces the dynamic stiffness of the system and increases the vibration isolation frequency range.

Benefits of technology

It achieves low or near-zero dynamic stiffness under static equilibrium conditions, solves the problem of low-frequency or ultra-low-frequency vibration isolation, increases the vibration isolation frequency range, improves vibration isolation efficiency, and maintains load-bearing capacity and reliability.

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Abstract

A kind of quasi-zero stiffness vibration isolation device based on negative stiffness generated by rotatable leaf spring, quasi-zero stiffness vibration isolation device includes positive stiffness component, negative stiffness component and height adjustment pad;Positive stiffness component, negative stiffness component and height adjustment pad are all installed in outer sleeve, and the bottom surface of positive stiffness component extends from the bottom of outer sleeve, beyond the bottom surface of outer sleeve, forms height difference on level;Negative stiffness component is located above positive stiffness component, and upper end surface extends the upper end surface of outer sleeve, outer sleeve is installed in floating plate, and moves up and down with floating plate together;The negative stiffness component is the negative stiffness component formed by rotatable leaf spring combination, and negative stiffness is generated by the change of rotatable leaf spring.The rotation or movement of rotatable leaf spring negative stiffness component in the process of vibration isolation forms matching negative stiffness, so that good quasi-zero stiffness low-frequency vibration isolation performance is obtained, and the vibration isolation efficiency of floating bed system is improved;It has the characteristics of simple structure, high reliability and long service life.
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