Dynamic Analysis and Isolation Effectiveness of a Low Stiffness Nonlinear Isolator

This paper presents a low stiffness nonlinear vibration isolator using pneumatic spring with an auxiliary chamber which is shortened by LSNVI. Firstly, the mechanical model of isolator, constructed two opposite mechanisms includes load bearing mechanism (LBM) and corrected (SCM), introduced. Secondly, restoring force found. Based on this, dynamic calculated numerically. Then, curve was approximated expanding Taylor series to order-5. Next, numerical simulation carried out investigate effect pressure ratio system stiffness. Simultaneously, Multi-scale method, frequency-amplitude relation analyzed. The transmissibility characteristic LSNVI simulated compared that equivalent traditional (named NVI-non SCM) in SCM removed. results illustrate isolation effectiveness former better than latter. result shows can offer vision performance. presentation furnishes useful insight into design for frequency