Study on Influence Law of System Parameters on the Dynamic Response of High-static-low-dynamic Stiffness Vibration Isolator Working Under Off-design Condition; [非设计工况下的高静低动隔振器参数的响应影响规律研究]

A high-static-low-dynamic stiffness (HSLDS) vibration isolator using a circular plate as negative stiffness corrector and paralleling with linear spring is introduced in this paper. The buckling modes of the circular plate are analyzed by using FEM while the HSLDS characteristics of the vibration isolator are calculated and verified using ANSYS software. If the load is chosen properly, the equilibrium point will be set at the zero stiffness point, any change of the load will cause the equilibrium point to deviate from the initial setting equilibrium point. The nonlinear mathematical model of HSLDS vibration isolator considering load imperfection is developed and its response characteristics are analyzed by using the increment harmonic balance (IHB) method, and the influence law of the sys- tem parameters on it is analyzed. The results show that the dynamic response will exhibit softening, hardening, and softening-to-hardening characteristics, depending on the effect of load imperfection, damper and excitation force. © 2021, Editorial Board of Journal of Ship Mechanics. All right reserved.