Kento Kumagai

Investigation of poppet valve vibration with cavitation

Abstract The poppet valve is a popular component in hydraulic systems, but it is also well known as trouble maker because it may occasionally induce unpredictable vibration. In former previous studies it has been found that cavitation is an important reason for this kind of vibration, but the causal mechanism between the vibration and cavitation is unclear. In this study, we developed a visualisation experiment system, in which we can observe and analyse the dynamic relationship among the displacement of the poppet, the cavitation quantity and the pressures around the poppet in a visualisation experiment. Based on the observation of the experimental phenomena and data analysis, we propose a hypothesis of a mechanism that can explain how cavitation influences the vibration of the poppet valve.