| The car crashes in the whole world induce much casualty and loss annually, which is leading to high investment to the safety research by the governments and the vehicle manufactures all around the world. The improvement of passive protection is obvious during these years research on the protection of general occupant and children occupant, but the research of pregnant occupant is on the first step.After investigating the abdominal anatomy of pregnant female and reading the literatures regarding pregnant female modeling and occupant protection, a 32-week uterus model is constructed via UG. Then the model is meshed and the material property is defined by ANSYS. In order to realize the pregnant female model, the uterus FE model is integrated into the 5 percent female facet occupant model with the help of MADYMO6.2.1. After validation by the abdominal response corridor, the pregnant female model response is proved to be stable and fulfill the requirement.Based on the new pregnant occupant model, some modifications of the protective system are investigated. For reducing the possibility of placental abruption, two types of seat belt which is added a protective sheet for enwrapping the abdomen are brought forward. The new design can reduce the impact energy of amniotic fluid and fetus, which causes the strain of the uterus wall in Uterus Placental Interface (UPI). The result of the simulation shows that the new design can reduce the strain in UPI to a figure which is much less than 60% in the high-speed crash condition, which means a better protection for the fetus. In order to further study the possibility of the fetus injury caused by the seat belt force, the abdominal force caused by the seat belt is calculated, however, there is no injury criterion for the fetus so far. A device for buffering is added on the knee. The result shows that it is effective to reduce the abdominal force and the possibility of the fetus injury by using a knee belt to limit the movement of the legs.
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