Approach Of Determining Civil Aeroengine Objective Time On Wing And Its Application

Civil aero-engine maintenance workscope directly affects the performance after ashop visit and the maintenance cost. The aero-engine objective time on wing is thebasis of making aero-engine maintenance workscope. Reasonable objective time onwing have important significances for improving workscope optimized effectivenessand practical applicability. Life limited parts, important parts and performancerecovery are the main factors of making objective time on wing. Approaches foraero-engine objective time on wing determination is proposed based on airlinesmaintenance management background.According to the influence of engine maintenance cost, a multi-objectiveoptimization model of time on wing is established, on the basis of the analysis of eachoptimization objectives, a solution method based on is put forward. The approach forrepair objective determination is validated by the actual data for an aero-engine froman airline. Validation results according to actual data show that the proposed approachis perfectly.Important parts is one of the main factors of influencing engine material cost.Established important pasts scrap probability model, provided approaches of parameterestimation and tests of significance, stablished regression equation of the scrap cost ofseveral kinds of important parts. A multi-objective optimization model and solutionmethod are established. The approach for repair objective determination is validated bythe actual data for an aero-engine from an airline. Validation results show that theproposed approach can provide decision support for making objective time on wing.Performance deterioration is one of the aero-engine maintenance main reasons. Inview of the characteristics of the stochastic volatility of aero-engine performanceparameters, methods of gross error identification and smoothing are respectivelystudied, regression equation of performance recovery cost also is established. Then, amulti-objective optimization model and solution method which based on aero-engineperformance recovery are proposed. Application cases for making objective time onwing are presented to verify the effectiveness of methods. Finally, according to the actual demand of Air China co., LTD. aero-engineworkscope making. A approach for comprehensive assessment of time on wing andneeds analysis of system are presented. Then, system functional modules andarchitectural framework of workscope decision supporting system are designed and thesystem running instances are introduced. This system has been online application inAir China. The application results indicate that the system effectively improve thework efficiency of airline.