On the effectiveness of ABH-based metamaterials in vibration control of naval equipment subjected to underwater explosion loads

The dynamic response of marine structures to underwater explosions (UNDEX) is crucial for ensuring onboard equipment's operational safety and reliability. Non-contact UNDEX events generate shock waves and bubble oscillations that induce vibrations propagating through the hull, potentially affecting sensitive systems. This study proposes a novel numerical framework integrating a high-fidelity acoustic-structural coupled model (CASA) with an Acoustic Black Hole (ABH)-based metamaterial solution to enhance vibration mitigation. A validated finite element model of a full-scale patrol vessel is used to assess the frequency response of equipment mounted on traditional resilient supports. The innovation lies in the integration of ABH into the mounting system, forming a passive control solution tailored to reduce UNDEX-induced excitations. Comparative analyses between conventional mountings and the proposed configuration show that the ABH-based metamaterial effectively attenuates vibrations above its theoretical cut-on frequency, leading to reductions up to 20 m/s² in acceleration amplitude and an average peak attenuation of approximately 61 %. This work represents the first application of ABH technology in a naval context for mitigating UNDEX effects, offering a promising strategy for improving onboard equipment protection.