期刊
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
卷 65, 期 -, 页码 32-43出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijnonlinmec.2014.04.011
关键词
HSLDS non-linear isolator; Stiffness and load imperfection; Dynamic response; Displacement transmissibility; Harmonic Balance Method
类别
资金
- National Natural Science Foundation of China (NSFC) [11202128]
- Foundation for Innovative Research Groups of the NSFC [51221063]
The dynamic characteristics of a high-static-low-dynamic-stiffness (HSLDS) non-linear isolator, built by combining an Euler beams formed negative stiffness corrector and a traditional linear isolator are investigated. The system imperfection caused by detuning of the stiffness and the load are considered. The frequency response curves (FRCs) for the non-linear isolator with load and stiffness imperfection under base displacement excitation are calculated by using Harmonic Balance Method (HBM). The stability is studied by the Floquet theory. The effect of the imperfection on the dynamic response as well as the displacement transmissibility of the non-linear isolator is explored and discussed. The results show that both the stiffness and load imperfection can affect the performance of the non-linear isolator significantly. The HSLDS isolator with load and stiffness imperfection for different base excitation amplitudes can demonstrate pure softening, softening-to-hardening and pure hardening characteristics with multi-valued solutions. The occurrence of jump phenomena is observed and explained by the stiffness variation. When the isolator is subjected to load imperfection, keeping a small positive stiffness, rather than making the minimum dynamic stiffness as zero, is preferred in order to obtain the best isolation performance. The performance of the non-linear isolator can outperform the linear one provided that the base displacement excitation is not too large. The non-linear system may undergo unbounded responses for very large base displacement excitation. (C) 2014 Elsevier Ltd. All rights reserved.
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