Analysis of the jet pipe electro-hydraulic servo valve with finite element methods

Abstract

Abstract.The dynamic characteristics analysis about the jet pipe electro-hydraulic servo valve based on experience and mathematical derivation was difficult and not so precise. So we have analysed the armature feedback components, torque motor and jet pipe receiver in electrohydraulic servo valve by sophisticated finite element analysis tools respectively and have got physical meaning data on these parts. Then the data were fitted by Matlab and the mathematical relationships among them were calculated. We have done the dynamic multi-physical fields' Simulink co-simulation using above mathematical relationship, and have got the input-output relationship of the overall valve, the frequency response and step response. This work can show the actual working condition accurately. At the same time, we have considered the materials and the impact of the critical design dimensions in the finite element analysis process. It provides some new ideas to the overall design of jet pipe electro-hydraulic servo valve.

Modeling of a Jet Pipe Servovalve Considering Nonlinear Flow Forces Acting on the Spool

“…Li et al [13] established a numerical model of the jet pipe servovalve and analyzed the effects of the structural parameters of the jet pipe and the back pressure of the system on the characteristics of the flow field. Zhao et al [14] built a structural model of the armature assembly, a magnetic field model of the torque motor, and a flow field model of the pre-stage based on Ansys. An overall model of the servovalve was derived by linking the above models together to obtain the dynamic characteristics.…”