基于运行成本优化的FADEC系统TLD分析

TLD Analysis of FADEC Systems Based on Operational Cost Optimization

为了降低飞机限时派遣(TLD)的运行成本,提出了全权限数字式电子控制(FADEC)系统TLD分析的运行成本优化方法。构建了TLD分析的典型马尔可夫模型,推导了该模型各状态稳态频度公式,从而建立了系统单位时间运行成本与派遣时间间隔的函数关系,并以此作为运行成本优化的目标函数;推导了发动机控制系统平均安全性水平表达式,建立了平均安全性水平对派遣时间间隔的约束。针对FADEC系统建立了3种不同的形式的系统单位时间运行成本函数模型,并提出了相应的派遣间隔决策建议。结果表明:应用基于成本优化的FADEC系统TLD分析方法进行带故障派遣决策,能够在满足安全性要求的情况下,降低飞机运行成本。

An optimization method of operation cost for TLD analysis of FADEC system was proposed for cost reduction of aircraft op-erating under TLD.A typical Markov model of TLD analysis was established,the formulas for calculating the frequency of each stable state were derived;and the relationship between the unit time operating cost and the dispatch intervals,which will be applied as the objective function for operating cost optimization,was determined.The expression of average safety level of engine control system was derived,and the constraint of the average safety level on the dispatch interval was established.Three different forms of system unit time cost function were established for the FADEC system,and the decision suggestions for dispatch intervals were proposed.The results show that the appli-cation of the cost-optimized FADEC system TLD analysis method for decision-making of dispatch with faults can reduce the operating cost of aircraft while meeting the safety requirements.