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.

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.

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.

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.

This paper aims to study the elastic wave propagation characteristics and vibration and noise reduction mechanisms of periodic ship sandwich plates.

To this end, the dispersion relation and flexural wave bandgap characteristics of lightweight sandwich plates are numerically investigated using the finite element method in combination with the Bloch theorem. The flexural vibration and sound transmission properties are analyzed to study vibration and sound reduction, and experimental validation is further conducted to verify the numerical results.

Lightweight sandwich plates can yield flexural wave bandgaps in a specific frequency range due to the Bragg scattering effect, resulting in flexural vibration isolation and sound insulation.

Flexural wave bandgaps can be effectively tuned by geometrical parameters, and this technology can potentially be applied in the vibration and sound control of ship structures.