Investigation on unstable fluid load compensation of a diverged flow poppet valve

Abstract

This paper proposes an effective methodology to decrease the unstable fluid load on the plug of a poppet valve. The aim is to minimize the impact of the sudden fluid load on the control performance and reduce the failure rate of the valve by compensating the output torque of the actuator in real time. The total load superimposed with the unstable fluid load acting on the plug was derived and the relationship among the fluid load, flow parameters and plug displacement was established. Based on the principle of the current loop in the control system of the permanent magnet synchronous motor, the method and strategy of compensating the maximum output torque of the actuator on demand were presented. The co-simulation model of the poppet valve system and load compensation module was built applying AMESim and Matlab/Simulink, and the compensation effect of the valve under sudden change conditions was analyzed. Simulation results show that the unstable fluid load acting on the compensated plug was significantly reduced, and the time for the valve to achieve the equilibrium was shortened by 38.5%. To address implementation concerns, simulation results with different abrupt loads and compensation coefficients were also studied.