Thermal-hydraulic modeling and simulation of piston pump in electro-hydrostatic actuator system

In the traditional hydraulic actuation system, the temperature-change of the hydraulic oil was small in operation, however, the temperature-change of the hydraulic oil could be hundreds of degrees in EHA system. The wide temperature-change would affect the parameteres of the hydraulic oil and the efficiency of the pump. Therefore, the thermal-hydraulic model would not be applicable to the thermal modeling of the pump in the EHA system, because it neglected the influence of the wide temperature-change. For solving this problem, a novel thermal-hydraulic model of pump by lumped parameter method was proposed, then a precise model of leakage flow and dynamic viscosity were introduced into this model. This novel model was certified by simulation, and the results indicate that this model was practical and accurate, and was more suitable for the thermal modeling of the pump in EHA system.