Coincidence of pressure pulsations with excitation of mechanical vibrations of hydraulic system components : An experimental study

This paper discusses certain excitations that affect the components of hydraulic systemscomposed ofpipes and valves. The negative effects of low-frequency noise and vibration on humans are also pointed out. Particular attention is given to the effect of pulsatile flow on the structure of hydraulic components. Pressure pulsations in a hydraulic system areshown to generate and transmit mechanical vibrations across a wide spectrum of frequencies, and the negative consequences of this phenomenon arepointed out.Based on the latest generation of proportional directional control valves, a special stand was built to generate pressure pulsations over a wide frequency range(up to 350 Hz).Amplitude-frequency spectraof mechanical vibrations and pressure pulsations were used instead of time courses in the considerations.The paper concludes that effort must be made to reduce the amplitudes of pressure pulsations in hydraulic systems, particularly in the low-frequency spectrum