Affiliation of Author(s):航空学院
Journal:JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
Key Words:Vibration isolator Negative stiffness Quasi-zero stiffness Dual-chamber Dynamic absorber
Abstract:Objective The vibration isolator with quasi-zero stiffness can achieve extraordinary isolation performance in high bands for its negligible elastic force. The novel dual-chamber solid and liquid mixture (SALiM) isolator, designed for vibration reduction of heavy machines, can obtain a quasi-zero-stiffness property in certain frequency band. This article implemented a deep analysis on the mechanism of the novel isolator. Methods In this work, the dynamic model of the isolator was established and the expressions of stiffness and damping were derived. Both experimental and numerical methods were adopted to study the dynamic properties of the isolator. The test was performed by a fatigue testing machine, with which both the quasi-static and dynamic test results were obtained. Simulation The results show that the isolator's equivalent stiffness is frequency- and displacement-dependent. When the system is still, the isolator's stiffness is positive to keep the load capacity and stability. When the system is vibrating, the isolator is likely to capture a negative-stiffness property, which is helpful to get excellent isolation. In the quasi-zero-stiffness band, the isolator can obtain a satisfactory performance. Therefore, the isolator has the potential to be used as substitution for the traditional dynamic absorbers in some harsh working situations. The simulation results corresponded well with the test results. Conclusion This paper studied the mechanism of the negative stiffness by theoretical analysis and numerical simulation, and proved the practicability of the novel isolator experimentally. Finally, comparisons with the isolation performance of the traditional isolators were made to verify its advantage.
ISSN No.:2523-3920
Translation or Not:no
Date of Publication:2018-06-01
Co-author:李方硕,zhoujianhao
Correspondence Author:cq
Date of Publication:2018-06-01