关键词: 正面碰撞, 儿童约束系统, 自动紧急制动, THUMS 6YO人体有限元模型, 坐姿

Abstract: To clarify the differences in head and thoracic-abdominal injuries among child occupants in different seating positions during frontal car collisions with and without the intervention of AEB, the driving speeds of urban expressways(90km/h) were combined with NHTSA-NCAP test conditions to establish a full-vehicle 100% overlap rigid barrier frontal collision simulation model. A CRS with a backrest was selected. The THUMS 6YO human finite element model was used to simulate three seating positions:reference(RF), head forward-out of position(HF-OP), and pre-submarining(PSB). The kinematics responses and the risks of head and thoracic-abdominal injuries of child occupants in the three positions were analyzed and compared with and without the intervention of AEB. The results show that, under AEB conditions, the HIC15 and the chest 3 ms resultant acceleration of the children in RF sitting position decrease by 43.6% and 24.6% respectively. In PSB position, the head 3 ms resultant acceleration is reduced by 19.2%, and the chest compression is reduced by 18.1%. In HF-OP position, the peak accelerations of the head and chest are reduced by 28% and 25%, respectively. In all three sitting positions, AEB intervention significantly reduces the risk of head and chest injuries in child occupants.

Key words: frontal collision, child restraint system(CRS), autonomous emergency braking(AEB), THUMS 6YO human finite element model, sitting posture