METHOD AND APPARATUS FOR DIAGNOSING SOUND OR VIBRATION ABNORMALITY

摘要

PROBLEM TO BE SOLVED: To provide an abnormality diagnosis method and an apparatus capable of accurately diagnosing the occurrence of abnormalities in a plurality of sound sources or vibration sources on the basis of analytical results of sound or vibrations at a specific evaluation point by adopting an analytical method including time information.;SOLUTION: Noise detection signals detected at the evaluation point are filtered at a low-pass filter 70 to extract evaluation waveform signals S. The evaluation waveform signals S are provided for a mother wavelet driving part 71 to derive a complex-number-type actual-signal mother wavelet ψ(t). This ψ(t) is used to perform wavelet transform on abnormality waveform signals V₁-V₃ previously stored in an abnormality waveform storage part 75. Correlation values between the abnormality waveform signals V₁-V₃ and the mother wavelet ψ(t) are computed at a correlation computation part 73 and compared with a predetermined criterion for determination at an abnormality determination part 74 to determine the presence or absence of abnormalities of the sound sources or the vibration sources corresponding to each of the abnormality waveform signals V₁-V₃.;COPYRIGHT: (C)2007,JPO&INPIT