| Citation: | WANG Yan, GUO Shengrong, YANG Leet al. A thermodynamic modeling method of electro-hydrostatic actuator and law of oil temperature rise[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(8): 1596-1602. doi: 10.13700/j.bh.1001-5965.2017.0622(in Chinese)
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Electro-hydrostatic actuator (EHA), one of the key subsystems in the more electric aircraft, can reduce the size and weight of airborne equipment because of its highly compact design. However, the heat dissipation is weakened simultaneously, which can easily lead to an extremely rapid temperature increase and loss of function. In view of the drawbacks of traditional 1D thermal model, a "3D-1D-3D" thermal modeling method was proposed in order to research on the temperature rise of EHA driven by oil-cooled motor. Firstly, the conversion and transfer of energy in EHA were analyzed, aiming to find out the heat source and its diffusion. Further, the "3D-1D-3D" thermal modeling method was proposed considering that the parameters varied with time. Secondly, the 3D thermal model of EHA motor was established in ANSYS including the heat generation module and dissipation module, while the other components, for instance piston pump, hydraulic cylinder, valves, pressurized tank, etc., were studied with 1D thermal models. Finally, the whole "3D-1D-3D" thermal model of EHA was integrated on AMESim platform, and validated by experimental results. The results from simulations and experiments reveal the law of temperature rise in EHA, which provides the theoretical guidance for thermal design of EHA.
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