Analysis of Transfer Characteristics and Impact-Resistance of Submersible Subjected to Underwater Impact Loads

In order to study load transfer characteristics and impact-resistance of submersible under underwater impact conditions, taking a certain type of submersible as an example, the transfer law of shock loads along the submersible structure and the comparative impact-resistance of the projectile under different adapter layouts were investigated. Based on the acoustic-structure coupling method, the finite element model of the submersible was established in ABAQUS, and the ICEEMDAN method was used to process vibration acceleration signals of the measurement points on the transfer path. The results showed that with the transmission of impact energy in the submersible, the proportion of high-frequency components and the main frequency of the component vibration response gradually decreased, and the load energy gradually diminished. Combined with the component stress contour, the weak areas on the transfer path were identified. The impact-resistance of the projectile under different layouts was compared and analyzed, which shows that when the adapter spacing is 1.025 times the original, the weighted vibration acceleration of the projectile is minimized, and its shock resistance adaptability is the strongest, providing a reference for subsequent optimization of adapter layout and improvement of impact-resistance of the submersible.