Abstract
The momentum wheel is a key component of the satellite attitude control system and has a direct impact on the reliability and overall life of the satellite. The momentum wheel has the characteristics of a high reliability, long life, and complex failure mechanics, which leads to expensive maintenance and a low reliability of the test sample. Therefore, it is challenge to implement an accelerated life test. The traditional life data statistical method has great difficulty in solving the reliability analysis of the momentum wheel. A reliability calculation method based on copula function for multi-degradation is proposed. Firstly, the key factors affecting the reliability of the momentum wheel are analyzed, and the lubricant residual quantity and current are selected as the degradation quantity. Secondly, the wiener process is used to model the degradation of a single degradation quantity, and the edge distribution function of the momentum wheel reliability is obtained. Considering that the correlation between multiple degradation quantities has a non-negligible influence on the reliability analysis result, the copula function is introduced to describe the correlation, and the edge distributions are fused to obtain the joint distribution function of the momentum wheel reliability.
Highlights
With the development of modern equipment to complexity, reliability research is facing more and more challenges, for example the multi-state [1], common cause failures [2,3], survival signature [4], epistemic uncertainty [5,6] and multi-degradation of complex systems should be taken into consideration when conducting reliability modeling and analysis
Momentum wheel reliability curve based on current degradation
The results show that the edge distribution of lubricants and currents is Copula function is used to fuse the two
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. There is no mature momentum wheel failure mechanism model For this type of object, using the equipment degradation data to establish its performance, the degradation model is a widely used life prediction method [7]. The failure mechanism of the momentum wheel lubrication is studied to obtain the life reliability curve of the satellite momentum wheel. [22] conducted the finite element analysis under multiple coupling operating conditions and frictional heat on momentum wheel bearings and established the reliability model of bearings based on stress-strength interference. According to actual experience and failure analysis of the momentum wheel, it can be confirmed that there is a correlation between different performance degradations; it is necessary to quantity the correlation to accurately conduct reliability research on momentum wheels.
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