冲击荷载作用下有限元方法求解波动过程的精度研究

研究了用动力有限元求解瞬态波动过程中产生的高频振荡和波形畸变的原因，提出了提高计算精度的有效方法及相应的确定单元尺寸及时间步长的方法。计算结果表明，作者提出的方法能有效地提高冲击荷载下波动问题求解精度。

A STUDY OF SOLUTION ACCURACY OF F.E.M.ON WAVE PROPAGATION PROBLEMS UNDER SHOCK LOADING

F.E,M.(the finite element method)is the mostly adopted approach in solvingwave propagation problems under shock loading.The factors which cause the high frequency os-cillation of the system on dynamic responses are studied in this paper.An effective way to reduce the oscillation amplitude,to avoid the power lose,the step for de-termining the finite element mesh as well as the time interval in direct integration are proposed.Examples show that the solution accuracy of F.E.M.under shock loading are greatly im-proved by using the proposed method.