发动机飞行任务剖面Fuzzy聚类分析

七十年代后期,我们开始发动机载荷谱试飞。由于发动机飞行剖面参数变化比较复杂,虽然采用一些统计方法,分析剖面参数变化规律,但始终未能找出剖面分类方法,在整理发动机一百小时寿命期的载荷时,仍不得不采用典型任务及其被代表科目统计结果,这样就形成一个环形问题。发动机任务剖面如何从测试结果中分类才合理,才有代表性,也就是曲型任务剖面如何取得,一直是发动机载荷谱研究一个难题。美国军用规范提出对发动机任务剖面要进行统一化处理,如何处理始终是一个问号,几年来我们在探讨此问题。 

FUZZY CLUSTERING ANALYSIS OF GAS TURBINE ENGINE MISSION PROFILES

In order obtain engine mission profiles from a vast amount of flight test,the fuzzy matrix of the membership function of engine mission profile samples is established according to the theory of fuzzy sets and boolean algebra behaviours.The fuzzy matrix is examined by using sqaure method for meeting the equivalent conditions.When it meets equivalent conditions,the dynamic clustering is carried out by selecting various threshold values.The clustering analysis of the mission profiles for an actual engine has been completed by the complicated and enormous fuzzy caleulation based on statistical data of the engine loads measured in fiight test.The clustering method of three parameters(flight altitude,Mach number and angle of throttle lever)is first employed in the clustering analysis and the results abtained are satisfactory.