关键词: 时间限制性派遣;短时派遣;定检;维修;优化;全权限电子控制系统

Abstract: Time-limited dispatch (TLD) analysis of full authority digital engine control (FADEC) is one of the important contents of aircraft system safety analysis. Aiming at the problem that the short-term fault dispatch time is assumed to be a fixed value (125h or 250h) in TLD analysis, the optimization method of short-term fault dispatch time is studied. Firstly, by using fault tree and Markov method, and taking the loss of thrust control rate (R) requirement as constraint, the functional relationship between short-term fault dispatch time and long-term fault dispatch time is analyzed and established. On this basis, a multi-objective optimization model with short (long) fault dispatch time as variable, average maintenance time of the system and long-term expectation of running with fault as objective is constructed, which makes the selection of fault dispatch time in TLD analysis more flexible and reasonable. Finally, an example shows that compared with the fixed value ofST for 250h, the long-term expectation increases by 4.2% and the average maintenance time of the system increases by 8.6% whenST is optimized for 25h, which verifies the effectiveness of the method.