METHOD AND APPARATUS FOR IN-SITU DETECTION AND ISOLATION OF AIRCRAFT ENGINE FAULTS

摘要

A method for performing a fault estimation based on residuals of detectedsignalsincludes: determining an operating regime based on a plurality of parameters;extracting predetermined noise standard deviations of the residualscorresponding tosaid operating regime and scaling the residuals; calculating a magnitude of ameasurement vector of the scaled residuals and comparing the magnitude to adecision threshold value; extracting a mean direction and a fault levelmapping foreach of a plurality of fault types, based on the operating regime; calculatingaprojection of the measurement vector onto the mean direction of each of thepluralityof fault types; determining a fault type based on which projection is maximum;andmapping the projection to a continuous-valued fault level using a lookuptable.