Abstract
The actuator is the key to ensure the normal startup and operation of the ram air turbine (RAT) system. In order to improve the reliability of the actuator of the RAT system, we propose a RAT actuator simulation modeling and design parameter optimization method based on the multi domain unified modeling language Modelica. Firstly, a fault tree is established to identify the components that cause the main failure modes of the actuator based on the actual cases of the RAT. Secondly, the model of RAT actuator is built by using Modelica language. The correctness of the model is verified by comparing with the actual use, with the error of about 3.78%. Finally, in order to avoid oil leakage caused by excessive hydraulic oil pressure, under the premise of meeting the constraints of the actuator deployment time and the end deployment speed, the optimal design parameters are determined by simulation when the peak pressure of the hydraulic oil is minimized. The research results can provide reference for the forward design of RAT in China and have good engineering application value.
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