| 摘要 |
PROBLEM TO BE SOLVED: To introduce a simplified calculation method of kurtosis, and to model a shock waveform, a peak level, or the like as absolute indexing for effectively utilizing as an actual facility diagnosis method. SOLUTION: The peak waveform of vibration amplitude generated when a periodic moving body fails is detected. A bar KT<SB>N</SB>is obtained from a calculation formula with the waveform generated in the advance direction of time as a statistical kurtosis. Further, since the value of the kurtosis KT<SB>N</SB>in the normal value of normal distribution is 3.0 from the formula, an absolute coordinates bar Z<SB>N</SB>is obtained from a formula Z<SB>N</SB>= 1/(KT<SB>N</SB>-2). When the rotary moving body is normal and becomes more abnormal, Z<SB>N</SB>is equal to 1 and approaches 0, respectively, thus determining failure. COPYRIGHT: (C)2009,JPO&INPIT
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