Thermal-Hydraulic Lumped Parameters Model of Servovalve to Predict Performance Sensitivity to Temperature

Abstract

This communication deals with the thermal-hydraulic modeling and simulation of electrohydraulic actuators to predict the performance sensitivity to temperature. The work reported focuses on the simulation of the servovalve second stage within the AMESim software environment. In the first part, the influence of the static characteristic of this stage on the actuator performance is pointed up. Then, two different models are developed. The fist one is isothermal while the second one considers that all the heat generated by pressure losses is passed to the fluid. The analysis of simulated leakage flow, flow gain and pressure gain displays the influence of temperature and the importance of the type of model.