Motion Reliability Analysis of Retractation Mechanism Based on Co-simulation

The motion reliability of the landing gear retraction mechanism is influenced by multiple random factors during the aircraft’s service life, resulting in poorer motion reliability and undesirable motion characteristics. This paper proposes a method to analyze the motion reliability of the retraction mechanism that considers the influence of multi-source random factors, and the proposed method is applied to the rotatable tire-type landing gear retraction mechanism of a hypersonic vehicle. Then the sources of random factors that affect the performance of the retraction mechanism are thoroughly studied, and the probability method is used to determine the randomness of joint clearances, installation deviations, and aerodynamic load. Additionally, to address the issue of the retraction mechanism failure mode being an implicit function, an estimation model of the motion reliability of the retraction mechanism under multi-source random factors is established. The model is based on the Monte Carlo method and neural network, using a verified co-simulation model of the retraction mechanism. Finally, the impact of the mean and standard deviation of joint clearances, installation deviations, and aerodynamic load on motion reliability is evaluated. Key inspection guidelines are also provided for the operation and maintenance of the retraction mechanism.