Disadvantageous effects of vibrations on the micro-hydraulic relief valve: experimental approach

The paper discusses the negative impact of external mechanical vibrations, which lead to the malfunction of drive systems, particularly affecting hydrostatic drives. The hydraulic system components feature a spring-supported control element that vibrates due to external mechanical vibrations, leading to pressure pulsation. The resulting pressure pulsation causes many unfavorable characteristics of hydraulic system operation. The positive displacement pump is shown as the main source of pressure pulsation in a hydraulic system. For selected frequencies of external mechanical vibration close to the natural frequency of the valve control element, the resulting pressure pulsation far exceeds the pressure pulsation resulting from the displacement pump. This paper presents selected results showing pressure pulsations as a consequence of the displacement pump and external mechanical vibrations acting on the pressure-relief valve.