Shock response characteristics of vibration isolation system with multiple coupling elastic components

Objective In view of the shock resistance performance of warship vibration isolation systems, the shock response of a vibration isolation system with multiple coupling elastic elments is investigated.

Methods First, a physical model is established of a vibration isolation system with multiple coupling elastic elements consisting of a vibration isolator, limiter and external flexible pipe connector. The dynamic shock response characteristics of the vibration isolation system are then studied using the finite element method. In addition, the shock test of the vibration isolation system is carried out to verify the finite element model. Finally, the effect of the stiffness of the elastic elements on the shock response characteristics is determined.

Results The numerical simulation results of the shock response of the elastic isolation system are consistent with the shock test results, which verifies the feasibility of the elastic isolation system simulation method. With the introduction of flexible pipe connectors, the total vertical stiffness and acceleration response of the vibration isolation system increases, while its displacement response decreases.

Conclusions With the increase in the nonlinear stiffness of the elastic elements, the displacement response of the vibration isolation system decreases and the acceleration amplitude increases. The nonlinear stiffness of the elastic elements can regulate the shock resistance of the equipment, providing guidance for the shock protection design of ship structural equipment.