Effect of the system imperfections on the dynamic response of a high-static-low-dynamic stiffness vibration isolator

被引：96
作者：
Huang, Xiuchang [1 ]
Liu, Xingtian [1 ]
Sun, Jingya [1 ]
Zhang, Zhiyi [1 ]
Hua, Hongxing [1 ]
机构：
[1] Shanghai Jiao Tong Univ, Inst Vibrat Shock & Noise, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China
来源：
NONLINEAR DYNAMICS | 2014年 / 76卷 / 02期
基金：
中国国家自然科学基金;
关键词：
HSLDS nonlinear isolator; Stiffness and load imperfection; Dynamic response; Harmonic balance method; QUASI-ZERO-STIFFNESS; FORCE TRANSMISSIBILITY; HARMONIC-BALANCE; OSCILLATOR; RESONANCE; MECHANISM;
D O I：
10.1007/s11071-013-1199-7
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The dynamic response of a high-static-low-dynamic stiffness (HSLDS) isolator formed by parallelly connecting a negative stiffness corrector which uses compressed Euler beams to a linear isolator is investigated in this study. Considering stiffness and load imperfections, the resonance frequency and response of the proposed isolator are obtained by employing harmonic balance method. The HSLDS isolator with quasi-zero stiffness characteristics can offer the lowest resonance frequency provided that there is only stiffness or load imperfection. If load imperfection always exists, there is no need to make the stiffness to zero since it cannot provide the lowest resonance frequency any longer. The reason for this unusual phenomenon is given. The dynamic response will exhibit softening, hardening, and softening-to-hardening characteristics, depending on the combined effect of load imperfection, stiffness imperfection, and excitation amplitude. In general, load imperfection makes the response exhibit softening characteristic and increasing stiffness imperfection will weak this effect. Increasing the excitation level will make the isolator undergo complex switch between different stiffness characteristics.
引用
收藏
页码：1157 / 1167
页数：11
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