关键词: 航空发动机, 公差分析, 田口试验法, 装配尺寸链, 装配成功率, Pearson分布理论

Abstract: The traditional Taguchi method was only applicable to the case where the components distributions were normal in assembly tolerance analysis.Its calculation accuracy was not high enough to meet the requirements of high-precision,high-efficiency and short-cycle in the assembly process of aeroengine.Aiming at these problems,an improved Taguchi method was presented,which extended the traditional Taguchi method to handle the non-normal distribution cases by choosing the levels and weights of components reasonably.The first four moments of the assembly dimension variables were estimated accurately by the proposed method.Combined with Pearson distribution theory,a new tolerance analysis model was established.Based on the theoretical analysis,the effectiveness of the proposed method was validated by calculating the turbine rotor's assembly success rate of an aero-engine.

Key words: aero-engine, tolerance analysis, Taguchi method, assembly dimensional chain, assembly success rate, Pearson distribution theory