汽车碰撞计算机仿真中的子循环法分析

ANNLYSIS OF SUBCYCLING ALGORITHUMS FOR COMPUTER SIMULATION OF CRASHWORTHINESS

显式有限元分析中采用子循环法能够显著的提高计算效率。在对几种常用子循环法的稳定性和精度进行验证分析的基础上,提出了新的可应用于汽车碰撞过程仿真的子循环算法,该方法通过对汽车碰撞仿真模型中大量存在的刚性连接进行特殊处理以保证子循环方法的稳定性,其计算误差通过引入阻尼进行消除。自行开发了汽车碰撞子循环法分析程序,算例证明该方法在保证计算精度的前提下可大大提高计算效率。

It can decrease significantly the computation time in transient structural analysis to use subcycling algorithms which permit multiple time steps in explicit integration. Several subcycling algorithms are tested and it is shown that constant velocity subcycling algorithm possesses the best accuracy and stability properties. A new subcycling algorithm based on special treatment of rigid joint and proper choice of damper is proposed. The numerical example show that the algorithm present with higher computational efficiency with out losing accuracy.