Design and experimental validation of a corrugated honeycomb buffer against multi-directional impact and vibration for shipborne cabinets

For the protection requirements of shipborne cabinets subjected to multidirectional shock and multidirectional vibration, a corrugated honeycomb buffer with both multidirectional shock resistance and vibration isolation capability was designed based on corrugated honeycomb and porous rubber. The proposed buffer consists of a corrugated honeycomb, porous rubber, a metal casing, connectors, and spacers. The corrugated honeycomb serves as the primary energy-absorbing component for shock mitigation, while the porous rubber acts as the key vibration-isolation element. Through the interaction of these components, the buffer achieves integrated shock absorption and vibration isolation. A prototype of the corrugated honeycomb buffer was also fabricated. In accordance with the shock test standards for shipborne environments, shock tests were conducted on the cabinet equipped with the proposed buffer under both horizontal and inclined installation conditions. Acceleration responses of the cabinet in the lateral and vertical directions were measured under different test conditions, and the peak acceleration reduction ratio together with the shock transmissibility in different directions were calculated to evaluate the shock mitigation performance of the buffer. In addition, according to the vibration test standards for shipborne environments,sweep-frequency vibration tests were carried out in three orthogonal directions (X, Y, and Z). The vibration transmissibility in each direction was obtained, and the three-dimensional vibration-isolation performance of the corrugated honeycomb buffer was assessed systematically. The shock test results show that the cabinet fitted with the corrugated honeycomb buffer exhibits a low shock transmissibility of 0.091 under the horizontal installation condition, indicating an effective attenuation of shock. Under the inclined installation condition, the lateral and vertical shock transmissibility values are 0.132 and 0.083, respectively, which also remain at relatively low levels. These results demonstrate that the proposed buffer can maintain favorable shock-resistance performance under different installation configurations and loading directions. The vibration test results further indicate that, under typical shipborne vibration environments, the average vibration transmissibility values in the X, Y, and Z directions are 0.129, 0.085, and 0.180, respectively. The cabinet therefore maintains desirable vibration-isolation performance in all three directions, confirming the effectiveness of the proposed design in suppressing multidirectional vibration responses.Overall, the proposed corrugated honeycomb buffer can effectively reduce the dynamic response of shipborne cabinets subjected to multidirectional shock and vibration excitations. Owing to its stable shock attenuation capability and favorable three-dimensional vibration-isolation performance, the buffer provides a feasible protective solution for shipborne equipment and can serve as a reference for the design of protective structures for shipborne cabinets operating in complex mechanical environments.