Aero-engine Health Performance Evaluation Methods Research

Aviation engine thrust as power plant of the trunk aircraft, its complex structure and high temperature, high pressure, high speed adverse working environment, performance anomalies or degradation are likely to bring disastrous consequences. To avoid accidents during the flight, we must provide the reliable performance of the engine for large aircraft; therefore we require in-depth study of reliable engine performance evaluation methods to timely and accurately assess engine healthy performance, To improve the management level of the engine fleet and provide decision-making for replacement or repair.This paper studies three methods for evaluating the performance of the engine, firstly studied Analytic Net hierarchy Process(ANP) to evaluate the performance of the engine, This method through the perspective of the engine working principles, by researching the interactions and dependencies between performance parameters, Build engine performance evaluation network hierarchy, and get the weight vector performance parameters in this way,simultaneously handle its performance dimensionless parameters, finally calculate the engine performance index that can represent the two engine characteristics to compare the merits of engine performance. Then introduce the Technique for Order Preference by Similarity to Ideal Solution(TOPSIS)to evaluate the engine, according to this method of reverse order and mid-perpendicular contradictions problem, the paper put forward the origin as the negative ideal solution, to improve the performance parameters of standardizing; and using ANP to get the weight vector performance parameters, with several final Mahalanobis distances which characterize the correlation parameter for computing performance nearness degree, and in accordance with this sort of performance. Eventually, introducing bayesian feedback method on the basis of cloud gravity model so as to constitute a bayes feedback cloud model. With a integrated cloud indicates the current engine's cloud gravity to calculate the weighted deviation to measure the status of engine healthy performance and intuitive use of cloud image accurately expressed. In addition, the PW series engine as an example, on the basis of the three kinds of methods to evaluate engine performance, and compare the three methods; the results show that these three methods are accurate and reliable.The results of this paper have important significance for promoting the development of domestic civil aviation engine evaluation method. In order to integrate with the international general method, our research suggested here in the evaluation of engine performance method could better use the software or other meet the principle in this paper to calculate.