Response Characteristics of Different Posture Crew Impacted by Underwater Explosion

The crew is the weakness of the ship anti-impact system, and it is helpful to improve the protection design by clearly defining the impact response characteristics of human body. This paper focuses on the impact response regularities of crew in different postures. The impact response characteristics of supine human are studied via the real ship-human underwater explosion (UNDEX) impact test for the first time; A far field UNDEX load-structure-human body integrated response model is constructed based on the Taylor fluid-structure coupling principle, and the vertical response differences of typical organs of human body in different postures under the conditions of typical impact factors (0.30, 0.45 and 0.60) are compared and analyzed. The results indicate that the vulnerable organs of sitting, standing and lying persons are the pelvis, feet and head, respectively, which should be given priority protection. When the human body changes from a sitting position to a standing position, the loads on the organs in the upper part of human body significantly decrease, and the lumbar spine and pelvis are no longer vulnerable parts prone to injury. There is a tendency for the vulnerable parts to shift from the pelvis to the head when the human body changes from a sitting position to a lying position. Under the same impact factor, the response degrees of the organs of human body in different postures directly contacted with the deck are more sensitive to the change of deck mass and show a negative correlation. The research results can provide technical support for the impact protection design.