Research on impact damage of ship crew with sitting posture

Ships can suffer impact injuries when they are impacted by underwater explosions. Currently, the impact injury studies of seated crew members are mostly focused on lumbar-pelvic and neck whiplash injuries, and there is a lack of analysis of secondary collision injuries in the absence of seatbelt restraints. In this paper, an impact injury analysis of seated shipmates was carried out based on a multibody dynamics human model, and the accuracy of the model was verified by experimental comparison. Head Injury Criterion (HIC), Neck Injury (NIJ), Dynamic Response Index (DRI) and other injury guidelines were used to evaluate the impact damage in various parts of the human body. Sensitivity analysis was conducted for two parameters, namely impact factor and angle of attack, comparing the damage patterns of the human body with and without seat belt restraints. The results showed that the crew with a seatbelt produced a four-cycle whiplash motion, and the crew without a seatbelt would produce three phases: flight phase, deck-head collision phase, and deck-torso collision phase. These findings can guide the development of impact injury protection strategies for shipmates.