Yinxiao Hu, Hui Jin, Yufan Wang, Jiongxiang Zhou, and Hongjuan Ge
Common cause failure, electrical power system, β-factor, α-factor
The more electric aircraft (MEA) electrical power system is designed with multiple types of redundancy to improve safety, consequently more attentions need to be paid to common cause failure. Considering common cause failure types of redundant systems, the comprehensive probability correction model based on multiple algorithms is proposed. The different common cause failure algorithms, such as β, α, and the square root model are analysed for similar redundancy and non-similar redundancy systems with or without operational data, and the process for solving the common cause failure probability of system synthesis is investigated. Further research is carried out on the application of failure probability correction for aviation batteries and transformer rectifier units (TRU) of MEA. The results show that the proposed comprehensive probability correction model is effective, and can be applied to airborne complex systems. The research complements the safety assessment theory, and lays a foundation for the common cause failure probability correction and safety design of systems.
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