This paper proposes the core failure diagnosis method which is based o
n the pattern recognition principle and uses the harmonics synthesis m
ethod (HSM) as the pattern feature extraction method It has the advant
ages such as meaningful and explicit diagnostic result, high tolerance
on random measurement errors, simple and fast calculation process, an
d the possibility to easily and efficiently diagnose the core failure
such as the detector malfunction and misleading etc.. (C) 1998 Elsevie
r Science Ltd. All rights reserved.