摘要
建立某型国产小客车的有限元模型 ,完整的乘员约束系统模型并特别细化了影响碰撞安全性的铰链结构 ,成功模拟整车的正面碰撞。仿真结果显示 ,发动机罩盖铰链发生断裂 ,这与试验结果一致。铰链的断裂使整车的安全性能大大降低。通过对铰链材料的改进 (选用高强度钢 )以及对发动机罩盖内外板结构的改进 (降低外板棱边高度并在内板合理打孔 )。进一步的数值仿真显示铰链不再发生断裂 ,罩盖变形模式合理。对改进前后乘员伤害指标的考察也进一步说明整车安全性能的提高。
The complete finite element models of a passenger car, the occupant restraint system and the detailed structure of the hinge, which affects the safety of the car in this model were presented. The crashing of the car at 48.3*!km/h into a rigid wall was successfully simulated and the results were found to be consistent and in good agreement with the crash test. The data of the simulation also predicted that the hinge of the engine hood would fracture during the crash.This fact was validated by the test.The failure of the hinge is a great danger to the driver and the occupant. So according to the simulation, the material of the hinge is changed to the high strength steel and the structures of both the outer and inner panels of the engine hood are modified, and as a result, the hinge would not fracture and the deformation mode of the hood is improved, and also the risks of the occupant injury decrease.
出处
《机械强度》
CAS
CSCD
北大核心
2004年第4期376-379,共4页
Journal of Mechanical Strength
基金
国家自然科学基金 (60 1 740 2 3)
教育部博士点基金 (2 0 0 1 0 2 4 80 0 8)资助项目~~
关键词
碰撞模拟
结构改进
发动机罩
乘员安全
有限元分析
Crash simulation
Structural improvement
Engine hood
Occupant safety
Finite element analysis
