Research on airworthiness safety assessment method of time-limited dispatch(TLD)for the FADEC system of aero-engine
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限时派遣(time-limited dispatch,简称TLD)技术既是满足民用航空在安全性基础上保证可盈利性的民航业现实需求,也是重要的航空发动机适航验证环节.对TLD分析的来源和基础做了简要介绍,同时基于某型发动机FADEC系统可靠性模型,用理论方程和数值解析的方式,对单故障状态下和多故障状态下使用马尔可夫模型(Markov modeling,简称MM)、蒙特卡罗(Monte Carlo,简称MC)方法进行分析推导系统平均丧失推力控制(loss of thrust control,简称LOTC)率公式,通过对比分析双故障状态下两种方法的误差,确定在多故障条件下MC方法在可接受误差范围内可有效解决MM方法中高维状态空间爆炸问题,确定了仿真分析方法在TLD适航的应用流程,验证了MC方法在多故障下的合理性和适用性.在仿真分析基础上通过系统可靠性分配分析讨论了可靠性模型优化迭代时带给系统的影响,保证系统能在安全可靠的环境下运行.
Time-limited dispatch technology(TLD)is not only to meet the practical needs of civil aviation to en-sure profitability on the basis of safety,but also an important airworthiness verification link of aviation engines.The source and basis of TLD analysis are briefly introduced.At the same time,based on the reliability model of FADEC system of a certain engine,MM and MC methods are used to analyze and derive the average LOTC formula of the system under single fault state and multiple fault state by means of theoretical equation and numerical analysis.By comparing and analyzing the error determination of the two methods under the condition of double fault,the MC method can effectively solve the high-dimensional state space explosion problem in the MM method within the ac-ceptable error range under the condition of multiple faults,the application flow of the simulation analysis method in TLD is determined,and the rationality and applicability of the MC method under the condition of multiple faults is verified.On the basis of simulation analysis,the influence of reliability model optimization iteration on the system is discussed through system reliability distribution analysis,so as to ensure that the system can run in a safe and relia-ble environment.
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