Design and Dynamic Characteristics of a Quasi-zero Stiffness Vibration Isolation System with Adjustable Mass

doi:10.3901/JME.2025.01.209

Abstract

Abstract: In order to reduce the influence of large amplitude excitation and load change on vibration isolation performance, a new type of quasi-zero stiffness optimization structure suitable for different masses is proposed. Through static analysis, the condition that the system has a wide quasi-zero stiffness interval at the static equilibrium position is deduced, and at the same time, it provides theoretical basis for designing the vibration isolation system with adjustable load. The dynamic equation of the system is solved by harmonic balance method, and the force transmissibility and amplitude-frequency response characteristics of the system under simple harmonic excitation are obtained. The dynamic characteristics and vibration isolation performance of the new quasi-zero stiffness system and linear system are compared and analyzed by simulation and experiment. The simulation results show that the natural frequency of the new vibration isolation system is reduced by about 53.8%, the initial vibration isolation frequency is reduced by about 3.1 Hz, by 56.4%, and the displacement transmissibility peak value is reduced by about 57.8%. Under the harmonic excitation of different amplitudes (1, 5, 10, 15 and 20 mm), the initial vibration isolation frequency is reduced by at least 3 Hz, and the maximum displacement transmissibility peak is only 3.2, which has a stable vibration isolation effect for different amplitudes. Under different loads (30, 26 and 20 N), the initial vibration isolation frequency and natural frequency only changed by 0.3 Hz, and the initial vibration isolation frequency was reduced by about 58.7%. The experimental results show that the natural frequency is reduced by 2 Hz and the initial vibration isolation frequency is reduced by 3 Hz, which is consistent with the simulation. The new quasi-zero stiffness system can effectively reduce the natural frequency and the initial vibration isolation frequency, and at the same time, it can play a good role in vibration isolation for large amplitude vibration and different loads.

Key words: quasi zero stiffness, adjustable mass, low frequency vibration isolation, ADAMS simulation

CLC Number:

TH113

XUE Congcong, ZHANG Wanfu, TIAN Haiyang, LI Chun. Design and Dynamic Characteristics of a Quasi-zero Stiffness Vibration Isolation System with Adjustable Mass[J]. Journal of Mechanical Engineering, 2025, 61(1): 209-219.

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