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10. Internationales Fluidtechnisches
Kolloquium

8. - 10. März | 2016
in Dresden

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Kurzfassung

09:35   ics       Saal 5

Improvement of the Vibration Prediction of a Poppet Valve in a Cavitation State

First author:
Kento Kumagai, Hitachi Construction Machinery Co., Ltd., Japan

Co-author(s):
Shohei Ryu, Hitachi Construction Machinery Co., Ltd.
Masanori Ota, Chiba University
Kazuo Maeno, Kisarazu National College of Technology

Abstract:
Poppet valves are popular components of hydraulic systems, but they sometimes induce vibration in these systems. In particular, the vibration phenomenon of a poppet valve in a cavitation state is a troublesome problem in hydraulic systems, because the dynamic effects of cavitation on the poppet valve are difficult to predict. In this research, we investigated the vibration phenomenon of the poppet valve in the cavitation state in a visualization experiment and numerical simulation. We found in numerical simulation that it is possible to predict the tendency of the vibration by assuming that the bulk modulus of hydraulic oil is affected by the ratio of cavitation bubbles mixed in the oil. Additionally, we proposed a simple method of estimating the quantity of cavitation bubbles through visualization experiments and image processing. We then improved the prediction accuracy of the poppet valve behavior by applying the bubble mixing ratio obtained using the method in the numerical simulation model. The described methods not only avoid the sensor effect on the flow field but also save the additional measurement cost, and they are easy to apply to hydraulics systems.