【摘要】 为了研究车桥耦合系统的动力响应,首先将普通精细时程积分法进行改进;即将车辆荷载和车辆惯性力以"渐进"的方式加载到整个系统上。然后通过数值实例,编写MATLABT通用计算程序求解,得到运用改进时程法在积分步长较大情况下能得到较精确的结果。最后对计算精度和计算时间进行研究,得到积分步长对计算时间影响较大,积分间隔对计算精度的影响较大,所以在使用改进的精细积分计算式一般选取较大的积分步长和较小的积分间隔。更多还原

【Abstract】 In order to study the dynamic response of the train-bridge coupling system,the ordinary PIM(Precise Integration Method) is improved and generalized that put vehicle load and vehicle inertial force to the whole system with "progressive" method.Then an example by MATLAB is calculated,it is shown that the extended PIM has satisfactory precision when the integral step is large.At last study the calculational accuracy and computational time,integral step has more influence is got on computational time than integral interval,but integral interval has more influence on computational accuracy than integral step,so larger integral step land smaller integral interval when use PIM is generally choosed.更多还原