The effective method preventing and reducing the defects is to decrease the solid particles for the pollution of hydraulic oil and to avoid the impact and overhead of system.
减少固体颗粒对液压油的污染，防止液压冲击和系统发热是防止和减少系统故障行之有效的方法。
Numerical method is proposed for general mechanical impact systems by means of characteristic line theory . Simulation results of hydraulic rock drill are provided .
应用特征线方法，提出了一般冲击机械的波动力学数值计算方法，给出了一液压凿岩机械的数值模拟结果。
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