摘要
将汽车与砼护拦简化为刚体，给出了描述碰撞过程中车辆三维空间运动的Ｅｕｌｅｒ－Ｌａｇｒａｎｇｅ方程——微分代数方程组，采用半显式外插方法求解上述方程组。数值计算得出的车辆各方向上的最大平均加速度、最大侧倾角、最大俯仰角、车轮沿护拦面的最大爬升值及车辆脱离护拦时的弹出角等结果是从乘员风险和车辆轨迹等多角度全面评估砼护拦的安全性能的重要依据。针对美国ＮｅｗＪｅｒｃｙ型砼护拦的实际算例与文献结果吻合较好。
A rigid body model used to simulate the collisions between vehicles and concrete barriers is established. The Euler—Lagrange equations in the form of differential—algebraic equations(DAEs) for constrained vehicle motion are obtained. A half—explicit extrapolation numerical method is used to integrate the DAEs. The method presented in this paper can figure out the maximum average accelerations over 50millisecond; maximum height of tire climb; maximum pitch and roll angles and exit angle, which can be used to evaluate the safety performance of concrete barriers from the aspects of occupant risk and vehicle trajectory.
出处
《计算力学学报》
EI
CAS
CSCD
1997年第4期388-393,共6页
Chinese Journal of Computational Mechanics
关键词
汽车
碰撞
安全性能
数值模拟
混凝土护栏
vehicle, concrete barrier, collision, safety performance, numerical simulation
