Session: 01-01: Valves and Actuators

Paper Number: 140375

140375 - Effect of Damping Force on Hysteresis Characteristics of Poppet Valves 

Abstract: 

To clarify the relationship between hysteresis characteristics and flow patterns, the flow patterns of a prototype poppet valve were systematically organized using CFD (Computer Fluid Dynamics) software. Hysteresis characteristics of the poppet valve can be reproduced by a combination of CFD analysis and one-dimensional equations of motion (second-order equations of motion of the spring-Mass system and compressibility of the pressure controlled by the valve orifice), which are caused by the reversal of the polarity of the flow force generated by the transition in the flow pattern. On the other hand, the damping force generated by the damping orifice is relatively large, similar to the flow force, and varies significantly with the amplitude of the flow. In general, the damping orifice has a very large influence on the stability and responsiveness of pressure control valves that use poppet valves to set the control pressure by the set load of the spring and control it to a constant pressure. In addition, it is effective to increase the damping ratio of the system to stabilize the system. However, in the hysteresis in the flow characteristic with respect to the control pressure, it was confirmed that the change in damping force has little effect on the phenomenon of sudden flow fluctuation at the same pressure level on the hysteresis curve, and that the effect of the transition in the flow pattern is dominant. The results for the flow coefficient and cavitation obtained at the same time are also presented.

Presenting Author: Seiei Masuda IHI Co. Ltd.

Presenting Author Biography: 1990 Completed Master's program in Science and Engineering, Sophia University Graduate School, and joined IHI. Engaged in research and development of hydraulic control equipments and Fuel metering units for aviation turbofan engines up to the present. 2021 Graduated from Kyushu Institute of Technology with a doctorate in Information Engineering. Professional Engineer (General Engineering Supervision Division, Mechanical Division, Japan)

Authors:

Seiei Masuda IHI Co. Ltd.
Fumio Shimizu Graduate School of Information Engineering, Kyushu Institute of Technology
Masaki Fuchiwaki Kyushu Institute of Technology
Kazuhiro Tanaka Graduate School of Information Engineering, Kyushu Institute of Technology