This paper revisits frequency domain analysis method for water hammer study in a hydraulic system. Detailed investigation of the effect of the flow parameters is conducted. Weaknesses on previous research works were pointed out. A brief presentation of the frequency response function determined from motions equations of transient water flow is firstly presented. A special emphasis was devoted to the effect of frictional flow on resonance pulsations. It was obtained that, unlike previous findings, resonance frequencies in a frictional flow are decayed from odd harmonics. This decay is more or less significant depending on the friction coefficient. The observations related to various effects are also illustrated through a set of test cases that were numerically analyzed. Additionally relative uncertainties highlighting the frictional flow effect on the accuracy of resonant pulsations detection are evaluated.

本文回顾了液压系统中水锤研究的频域分析方法。进行了流量参数影响的详细研究。指出了先前研究工作的不足。首先简要介绍了由瞬态水流运动方程确定的频率响应函数。特别强调了摩擦流对共振脉动的影响。可以发现，与以前的发现不同，摩擦流中的共振频率会因奇次谐波而衰减。取决于摩擦系数，该衰减或多或少是重要的。还通过一组进行了数值分析的测试用例说明了与各种影响相关的观察结果。