Pressure Oscillation Analysis Pressure and flow ripple in fluid power systems are frequent causes of problems and complaints. The pulsa- tions are significant if the ripple frequencies match the natural frequencies of the pipe network. The ripple causes fluid-borne noise that propagates through the pipe network and excites the surrounding parts to vi- brate. This induces undesirable noise emissions, unfavorable dynamic structural loads and naturally, a general reduction of the reliability of the hydraulic system. The problem in detail Positive displacement pumps are identified as the main source of fluid-borne noise. Due to the discontinuous operating principle of these pumps, the flow discharge delivered to the pipe network consists of a mean, sta- tionary flow with superimpose

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