这句话,没理解它的意思,高手解释一下吧

hitzhangke

Continuation of an amplitude reference in subsequent steps
If a boundary condition, load, or predefined field refers to an amplitude curve and the prescribed condition is not redefined in subsequent steps, the following rules apply:
  
If the associated *AMPLITUDE was given in terms of total time, the prescribed condition continues to follow the *AMPLITUDE definition.
  
If the AMPLITUDE parameter was not used or if the *AMPLITUDE was given in terms of step time, the prescribed condition remains constant at the magnitude associated with the end of the previous step.

suotao_npu

如果你的边界条件，载荷或者一些场变量的定义与amplitude有关，并且在此后的step中没有重新定义这些条件的话，程序会按照如下方式处理：
（1），如果amplitude得定义是作用于整个分时过程中的，那么在此后的时间中所有相关的条件仍然按照amplitude变化
（2）   如果未使用amplitude或者他的定义是与step相关的，那么各种相关条件的实际情况与前一个step结束时的状况相同，并保持不变