Shock isolation performance of a geometric anti-spring isolator

In this paper, shock isolation performance of a geometric anti-spring (GAS) isolator is investigated. The static and dynamic stiffness property of GAS isolator is discussed. The mathematical simulation is used to explore the effect of several parameters on shock isolation performance of GAS isolator under a modified half-sine pulse acceleration excitation. Shock isolation experiments of GAS isolator under base acceleration excitation with different excitation amplitudes and payloads are carried out. The results show that the dynamic stiffness characteristic of GAS isolator determines its shock isolation performance. When shock acceleration amplitude is not too large, GAS isolator shows better shock acceleration and absolute displacement isolation performance than the equivalent linear system. The effects of shock acceleration amplitude, payload, and damping on the shock isolation performance of GAS isolator are discussed, which provide guidelines for its further practical application.