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

Objectives In view of the shock resistance performance of the vibration isolation system of warship equipment, the physical model of the coupled vibration isolation system considering elastic elements such as vibration isolator and limiter and external flexible pipeline is established. The shock response of a variety of elastic components coupled vibration isolation systems is studied. Methods The shock resistance performance of the nonlinear elastic isolation system is studied by using the finite element method and experiment tests. Results Numerical results of the shock responses of elastic isolation system are consistent with the impact test results, which verifies the feasibility of the simulation method of elastic isolation system. With the introduction of flexible pipes, the total vertical stiffness of the vibration isolation system increases, the displacement response of vibration isolation system reduces and the acceleration response increases. Moreover, the nonlinear stiffness of the elastic components causes the acceleration response of the equipment to peak, which affects the shock resistance of the equipment. Conclusions With the increase of the nonlinear stiffness of the elastic element, the displacement response of the vibration isolation system decreases and the acceleration amplitude increases. The nonlinear stiffness of elastic components can regulate the impact resistance of the equipment, which provides guidance for the impact protection design of ship structural equipment.