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《Journal of Vibration and Shock》 2015-04
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Characteristic analysis of a ball-type vibration isolator with quasi-zero-stiffness

WANG Yi;XU Dao-lin;ZHOU Jia-xi;State Key Laboratory of Adraced Design and Manufacturing for Vehicle Body,Hunan University;  
A compact ball-type quasi-zero-stiffness( QZS) vibration isolator was proposed for the purpose of lowfrequency vibration isolation. Firstly, its parameters of quasi-zero stiffness were obtained using a static analysis.Furthermore,the dynamic model of the vibration isolation system was established, and the frequency-response characteristic and vibration isolation performance were analyzed with the harmonic balance method. The effects of excitation amplitude and damping on the system response were also discussed. Finally,numerical simulations were performed with ADAMS software,and the vibration isolation effects were evaluated. The results showed that compared with the corresponding linear vibration isolation system,the QZS vibration isolator can obviously reduce the starting vibration isolation frequency,and has a much lower load transmissibility in the range of low frequency; therefore,the negative stiffness provided by the ball-type mechanism significantly reduces the total vertical stiffness of the system,and the excellent low-frequency vibration isolation performance is achieved; what's more,its compact design makes it more convinient to be used in engineering.
【Fund】: 国家自然科学基金项目(11072075 11102062);; 湖南大学汽车车身先进设计制造国家重点实验室自主课题(71075004)
【CateGory Index】: TB535.1
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