A Study of Probability Distribution of Multiparameter Load Spectrum Combination

A method of multiparameter load spectrum formulation for aeroengine is provides.Firstly,according to the loading condition of the engine component,a parameter is selected as the norm.Secondly,the biparameter tables from the initial multiparameter load-time histories are made.Thirdly,by performing a statistical analysis of biparameter table data,the dependency relationships and interval spaces among the parameters can be obtained,and the pseudo-parameters are determined.Fourthly,the pseudo-biparameter tables are deduced from the initial multiparameter load-time histories,and the marginal and conditional probability distributions of the concerned parameters can then be estimated.Finally,based on probability theory the joint probabilities of any parameter combinations are calculated.Using this method,the paper deals with the multiparameter load spectrum of a fighter engine,and provides the joint probabilities of the combination between three directional overload coefficients and the engine rotational speed.