Design and characteristic analysis of quasi-zero-stiffness vibration isolator of rolling ball type
SUN Ziqiang
HAN He
YAN Ming
ZHANG Lei
ZHAO Guiren
Abstract：[Objective]In fields such as precision instruments and aerospace,low-frequency vibration control is crucial.In the field of low-frequency vibration isolation,the quasi-zero-stiffness vibration isolation system has attracted much attention in recent years due to its significant advantages.However,in practical engineering applications,it is still faced with the technical problems of insufficient range of quasi-zero-stiffness interval,which results in limited vibration isolation frequency band,and difficulty in further improving low-frequency vibration isolation performance.A novel quasi-zero-stiffness vibration isolator was designed in this paper to address these problems.[Methods]Based on the classic three-spring quasi-zero-stiffness structure,a new quasi-zero-stiffness vibration isolator based on a semi-circular cam and a rolling ball mechanism was proposed,which had a simple and compact structure.Firstly,through the static analysis of the system,the realization conditions of the quasi-zero-stiffness were determined,and the force-displacement and the stiffness-displacement relationship equations of the system were deduced,which revealed that the equivalent stiffness of the system near the equilibrium position was close to zero.Secondly,the dynamic characteristic equation of the system was established,and the amplitude-frequency response characteristics of the system were studied through theoretical analysis and numerical simulation,which revealed the nonlinear dynamic behavior of the system.Finally,the comprehensive effects of damping ratio,nonlinear term coefficient,and excitation amplitude changes on the vibration isolation performance of the system were deeply discussed by introducing force transmissibility and displacement transmissibility,and the system parameters were optimized to achieve the best vibration isolation effect.[Results]Compared with the traditional three-spring quasi-zero-stiffness vibration isolation system,the new vibration isolator significantly expands the quasi-zero-stiffness region,resulting in efficient low-frequency vibration isolation over a wider frequency range.The proposed vibration isolator has much lower force transmissibility than a linear vibration isolation system,and is able to isolate low-frequency vibrations more effectively.[Conclusions]The new vibration isolator designed in this paper effectively solves the technical problems of insufficient range of quasi-zero-stiffness interval and limited low-frequency vibration isolation performance faced by the traditional quasi-zero-stiffness vibration isolation system in practical engineering applications by optimizing structural design and parameter matching.Compared with the traditional linear vibration isolation system,the proposed vibration isolation system not only has a lower initial vibration isolation frequency but also shows better low-frequency vibration isolation performance,providing a new solution for low-frequency vibration control in the engineering field.
Keywords：quasi-zero-stiffness intervalnonlinear vibration isolation systemforce transmissibilitydisplacement transmissibilitynegative-stiffness mechanismamplitude-frequency characteristiclow-frequency vibration isolationpositive-stiffness structure
Publication Date：2025-11-25
Online Publishing Date：2025-12-29(First online date of this platform, not the publication date of the document)
Pages：8( 767-774 )