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Takeyasu, Kazuhiro,Amemiya, Takashi,Tanaka, Jumpei,Masuda, Shiro Korean Institute of Industrial Engineers 2005 Industrial Engineeering & Management Systems Vol.4 No.1
Among many dimensional and dimensionless amplitude parameters, kurtosis (4-th normalized moment of probability density function) is generally regarded as a sensitive good parameter for machine diagnosis. However, higher order moment may be supposed to be much more sensitive. Bicoherence is an absolute deterioration factor whose range is 1 to 0. The theoretical value of n-th moment divided by n-th moment calculated by measured data would behave in the same way. We propose a simplified calculation method for an absolute index of n-th moment and name this as simplified absolute index of n-th moment. Some favorable results are obtained.