停止发动机，释放液压系统的压力。
Stop the engine and release the pressure in the hydraulic system.
本文在实验研究的基础上对超声波检测液压系统的压力参数进行了理论分析并建立了实用的数学模型。
This paper establishes the mathematics model and carries out theory 's analyses for measuring pressure of hydraulic system by ultrasonic based on examinations.
由于液压系统的压力值通常是动态的，有时会出现冲击压力，冲击压力峰值会大大高于系统的最高压力值。
For the hydraulic system's pressure always be dynamic, there often appears an impact pressure; the maximum impact pressure is much higher than the maximum system pressure.
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