期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 62-63, 期 -, 页码 149-163出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2015.01.026
关键词
Vibration isolation; Quasi-zero-stiffness (QZS) system; Scissor-like structure (SLS); Geometrical nonlinearity
资金
- NSF of China [61374041]
- GRF of Hong Kong RGC [15206514]
- Hong Kong Polytechnic University
The study proposes a novel vibration isolator with 3D quasi-zero-stiffness (QZS) property. The remarkable feature of the proposed system is to apply symmetrically scissor-like structures (SLS) in the horizontal directions, together with a traditional spring-mass-damper system assembled vertically with positive stiffness. With the mathematical modeling of the proposed system, it is shown that the stiffness and damping properties are nonlinear due to nonlinear geometric relations within the SLSs and both can be adjusted via structural parameters of the system. Theoretical analysis with the harmonic balance method reveals that the system can demonstrate QZS property in 3 directions, and can achieve much better 3D vibration isolation performance, including high-static and quasi-zero-dynamic stiffness, and much larger displacement range around equilibrium, compared with an existing QZS system in the literature. The results provide a novel and significant multi-direction vibration isolation method using structural nonlinearity with noticeable performance but using only passive elements. (C) 2015 Elsevier Ltd. All rights reserved.
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