Abstract:

The rapid promotion of intelligent vehicles has expanded application scenarios for large-angle zero-gravity seats， presenting new challenges for the design of occupant restraint system. For the limitation of current crash test dummies in assessing occupant safety in reclined seating postures， based on the TUST IBMs F05 （5th percentile female） and TUST IBMs M50 （50th percentile male） occupant injury bionic models， a biomimetic model of occupant injury in reclined seating postures is developed in this study through posture adjustment reconstruction. The effectiveness of the model is verified by reconstructed cadaver tests. The test results indicate that the displacement-time curves of both models fall within the cadaveric response corridors. Additionally， the models accurately represent the thoracolumbar spine and pelvis geometry of the human body， while also exhibiting detailed soft tissue structures with high geometric realism and good mesh quality. With a high level of biofidelity， this model provides reliable baseline data for studying the injury mechanisms of reclined occupants in crashes， as well as for developing safety protection strategies and related regulations. Furthermore， it serves as an efficient computational tool for the development， safety assessment， and comfort evaluation of large-angle automotive seats.

Key words: reclined occupants, injury biomechanic model, the 5^th percentile Chinese female, the 50^th percentile Chinese male, large-angel seat