Since a mine pumping system can generally be simplified into a complicated pipe-line system in series, the transient process is simulated by a method of characteristic line.
根据矿井排水系统一般可以简化为串联复杂管路系统的特点，采用特征线法模拟其断电停泵的瞬变过程。
In this paer, by the use of the method of characteristic line of stress wave, a prediction analysis for the sacond impact of an elastic bar impacting on a rigid block is given.
本文采用应力波特征线方法详细分析了刚体撞块撞击固支的弹性长杆的撞击过程。
Indirect method can adjust the characteristic line equation in time based on the status of practical process, thus the forming precision can be improved.
间接法能够根据板料实际加工状态及时调整特征方程，提高了成形精度。
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