Int J Performability Eng ›› 2019, Vol. 15 ›› Issue (7): 1920-1928.doi: 10.23940/ijpe.19.07.p19.19201928

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Fastening Function Reliability Analysis of Aircraft Lock Mechanism based on Competitive Failure Method

Yugang Zhang*, Jingyi Liu, and Tianxiang Yu   

  1. School of Aeronautics, Northwestern Polytechnical University, Xi'an, 710072, China
  • Submitted on ;
  • Contact: * E-mail address: zhangyugang@nwpu.edu.cn
  • About author:Yugang Zhang is a lecturer in the School of Aeronautics at Northwestern Polytechnical University. Her research interests include mechanical system analysis and reliability testing.Jingyi Liu is a Ph.D. student in the School of Aeronautics at Northwestern Polytechnical University. His research interests include mechanical system multiple failure modeling.Tianxiang Yu is an associate professor in the School of Aeronautics at Northwestern Polytechnical University. His research interests include system reliability analysis.
  • Supported by:
    The research in this paper is supported by the National Natural Science Foundation of China (No. 51675428).

Abstract: The functional principle and failure analysis of a landing gear cabin door lock mechanism are researched in this paper. The fastening process is important for achieving the mission of the mechanism. There are two potential risks in the fastening process that may impact the stealthy performance of an aircraft: accidentally open errors and lock hook position errors. These two risks compete with each other. Competing failure models are established for the fastening process of the lock mechanism. The extreme model is used to describe accidentally open failures, while Brownian motion (BM) with non-linear drift and the Poisson process are adopted to model lock hook position error failures. The reliabilities for the lock mechanism are calculated at different working times. Results and conclusions are illustrated and provide helpful insight into the changes and degradation of the fastening process of the lock mechanism.

Key words: aircraft lock system, competing failure, degradation, system reliability