Reliability Allocation Method for Lightweight Propulsion System of Electric Aircraft

Aiming at the contradiction between lightweight and high reliability of electric propulsion system of electric aircraft, a reliability allocation method considering lightweight constraint is proposed for the first time. The analytical expression between weight and reliability is constructed, and the uncertainty of the operating conditions of electric aircraft is considered with this as constraint. A "weight-reliability" multi-scenario balanced optimization method based on typical flight profile is proposed, which achieves the lightest weight under reliability constraint and the highest reliability under weight constraint. Taking the "Spirit of Innovation" electric aircraft as an example, the method proposed in this paper can reduce the total weight of the electric aircraft propulsion system by 3.5% by allocating the reliability of each subsystem while ensuring the reliability of the system. The effectiveness of the proposed method is verified by designing different scenarios, providing technical support for the development of high power-to-weight ratio of electric aircraft.