首页|Dynamic analysis and vibration isolation characteristics of a compact quasi-zero-stiffness vibration isolator
Dynamic analysis and vibration isolation characteristics of a compact quasi-zero-stiffness vibration isolator
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NETL
NSTL
Elsevier
Aiming at the low-frequency vibration of high-precision instruments, this paper investigates a compact QuasiZero-Stiffness (CQZS) vibration isolator based on elastic materials with high static and low dynamic characteristics. This isolator is designed with a specific structure and parameter selection, making it a quasi-zerostiffness system with high static and low dynamic characteristics, and has the advantages of simple structure, high reliability, no friction, and good isolation performance. The article adopts the analytical idea of static analysis-dynamic analysis-vibration isolation performance analysis to derive the parameter conditions of the system with quasi-zero stiffness, and finite element simulation is used to verify the reliability of the theoretical derivation. The amplitude-frequency response of the system under simple harmonic force is solved based on the harmonic equilibrium method, and the saddle-node bifurcation set of the system is solved by the stability discriminant condition of Mathieu's equation, and the distribution of the periodical motion and the transition law in the parameter domain are investigated by multiparameter co-simulation, and the effects of the system parameters on the saddle-node bifurcation set and the force transmissibility are analyzed, and the performance of vibration isolation is evaluated. The study shows that: the system is induced by pitchfork bifurcation, saddlenode bifurcation, period-doubling bifurcation and boundary excitation to complete the transfer between the basic periodic motions; under the same parameter conditions, compared with the linear vibration isolation system, the resonance frequency ratio, the peak force transmissibility, and the starting vibration isolation frequency ratio of the CQZS vibration isolation system have been reduced by about 27%, 25.8%, and 62.98%, respectively, which broadens the vibration isolation frequency band, and the low-frequency isolation performance.
NETL
NSTL
Elsevier
