Double closed loop system has a little overshoot and short transition time, whose performance is better than single closed loop system.
双闭环转速控制系统超调小、过渡时间短，性能要好于单闭环系统。
The J integral is path-independent for the short time creep and long one, while in the transition period, it is weakly path-dependent.
积分在短时蠕变和长时间蠕变条件下是路往无关的，而在过渡蠕变时期，其与路径也只是弱相关。
Put forward how to change the parameter of module for short the time of transition.
从缩短过渡过程的角度提出了模块参数优化方向。
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