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research-article

Reliability Modeling for Gear Door Lock System with Dependent Failures Based on Copula

[+] Author and Article Information
Linjie Shen

School of Aeronautics, Northwestern Polytechnical University, Xi'an Shaanxi, 710072, China
473109870@qq.com

Yugang Zhang

School of Aeronautics, Northwestern Polytechnical University, Xi'an Shaanxi, 710072, China
zhangyugang@nwpu.edu.cn

Xinchen Zhuang

School of Aeronautics, Northwestern Polytechnical University, Xi'an Shaanxi, 710072, China
zhuangxinchen@126.com

Bozhi Guo

School of Aeronautics, Northwestern Polytechnical University, Xi'an Shaanxi, 710072, China
1090519629@qq.com

1Corresponding author.

ASME doi:10.1115/1.4039941 History: Received February 18, 2017; Revised April 02, 2018

Abstract

The gear door lock system (GDLS) is a hydraulic and mechatronic system with high degree of complexity and uncertainty, making the performance assessment of the system especially intractable. We develop copula models to estimate the reliability of GDLS with dependent failure modes. Based on the working principle of the GDLS, kinematic and dynamic model with imperfect joints is built, in which Latin hypercube sampling and kernel smoothing density are utilized to obtain the marginal failure probabilities. Then, copula models are utilized to describe the dependence between the two function failure modes. Furthermore, to be more accurate, mixed copula models are developed. The squared Euclidean distance is adopted to estimate the parameters of the above reliability models. Finally, the Monte Carlo simulation is conducted to evaluate the different reliability models.

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