Reliability Analysis of Landing Gear Retraction System Influenced by Multifactors

Abstract

The landing gear retraction system of an aircraft, including mechanical and hydraulic systems, is complex and nonlinear. It has many uncertain factors, which lead to difficulty in reliability analysis. To make the reliability analysis more accurate and efficient, some studies are represented in this paper. Taking the main landing gear of an aircraft as a research object, the dynamic equations of the retraction system were derived. The simulation model was built, combining the mechanism dynamics with the hydraulic system, and its accuracy was verified by laboratory test results. Based on this model, the paper shows how the key parameters, including the crosswind velocity, the diameter of the damping orifice, liquid capacity, friction, and oil leak, affect the performance of the landing gear retraction. After that, the limit state equation of the retraction system’s reliability was set up. For the implicit limit state equation, the response surface model of retraction reliability was established with a quadratic polynomial that has no cross terms and was verified by the Monte Carlo method. Finally, it was explained in detail how the key parameters affect the reliability of the retraction system. Some meaningful conclusions were obtained. The analysis method and its results can be references for the reliability study of the landing gear retraction system.

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