###### Abstract
[18] used a nonlinear explicit dynamic analysis method, established a three-dimensional free-field impact wave numerical model, and studied the fatigue damage state of the plate-type explosion-proof door under the action of underwater explosion impact spectrum through finite element numerical simulation. [PERSON] et al. [19] utilized a one-way coupled Computational Fluid Dynamics-Discrete Element Method approach to construct a finite element model of a polar vessel, observing the propagation of ice cracks and analyzing the comparison between simulation results and previous experimental data. This study validated that during the ice-breaking process, the ice load excitation is significantly greater than the hydrodynamic resistance excitation. [PERSON] et al. [20] established an impact resistance numerical model of the hydraulic coupling, conducted impact response calculations on it using the DDAM method, analyzed the performance characteristics of the main components under different impact loads, and used orthogonal experiments to analyze the influencing factors. [PERSON] et al. [21] designed the isolation system for the U.S. Navy's auxiliary turbine generator sets on ships. They used different simplified and complete system finite element models, selected specific elastic isolation installation seats, adjusted them through impact resistance test tests, and met the design requirements of the isolation system under the action of impact loads. [PERSON] et al. [22], based on typical multi/single-cargo hold asymmetric damage models, studied the water flooding characteristics of the compartment under dynamic explosion and conducted explosive impact calculations under time-domain conditions. [PERSON] et al. [23] proposed a method for analyzing the degree of structural fatigue damage under explosive impact, calculated the structural damage degree based on physical design parameters and accurate analysis results, and used it for the design structure configuration assessment of naval ships. The FLACS commercial program was used for verification. [PERSON] et al. [24], based on the dynamic design analysis method, conducted impact response calculations for a gas turbine simplified to a system with two degrees of freedom and analyzed the impact displacement response and impact stress response of key components such as the flexible bracket. [PERSON] et al. [25] established a semi-analytical model of the ship impact system and used the model to calculate the dynamic response of the submarine hull under the action of underwater explosion-induced pressure, derived simple mathematical expressions, and thus obtained the impact of non-contact explosions on the ship's hull and equipment. [PERSON] et al. [26] took the propulsion shaft system with an elastic coupling as an example, established its finite element model, and conducted impact calculations on the propulsion shaft system and high-elasticity coupling based on the DDAM method and time-history method, and analyzed its impact resistance performance. The time-domain analysis method investigates the dynamic response of a system as it changes over time under the influence of impact loads. It is suitable for calculating the dynamic characteristics of complex structures, such as propulsion shafting systems, under transient load conditions. However, compared to the frequency-domain method, it consumes more computational resources and is more complex than both the frequency-domain method and the equivalent static method. [PERSON] et al. [27], based on the German Navy standard, used numerical analysis methods to conduct time-domain transient response calculations on gas turbine units under non-contact underwater explosions and analyzed the impact load on key components for structural safety performance assessment. [PERSON] et al.