Thermal-hydraulic Modeling and Simulation of the Electro-hydrostatic Actuator Hydraulic System based on Lumped-Parameter Method

The electro-hydrostatic actuator has the advantages of high pressure, large power, small size, light weight and so on, which has been widely used in the industrial field. However, due to the cancellation of a centralized oil source, it is not easy for the electro-hydrostatic actuator to dissipate heat, resulting in high oil temperature. The complex coupling relationship among oil temperature, plunger pump leakage, and oil properties makes the heat generation and heat transfer mechanism of the electro-hydrostatic actuator unclear. Therefore, it is necessary to conduct multi-disciplinary modeling and analysis of the flow field-thermal field of the electro-hydrostatic actuator hydraulic system. By comparing with existing research simulations, the practicality of the model can be verified.