Abnormality diagnosing method for sound or vibration and...

Details Abnormality diagnosing method for sound or vibration and... Abnormality diagnosing method for sound or vibration and...

2011-04-26

2011-04-26

Charioui, Mohamed (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Performance or efficiency evaluation

C702S033000, C702S056000, C702S066000, C702S185000, C702S190000, C381S086000, C340S438000

Reexamination Certificate

active

07933742

ABSTRACT:
A noise detection signal detected at an evaluation point is filtered by a low pass filter, so that an evaluation waveform signal is extracted. A real signal mother wavelet of complex type is derived from the extracted evaluation waveform signal. Using this mother wavelet, an abnormal waveform signal stored in advance is processed by wavelet transformation. Then, a correlation value is calculated between the abnormal waveform signal and the mother wavelet. The correlation value is compared with a predetermined criterion, so that the presence or absence of abnormality in a sound source or vibration source corresponding to each abnormal waveform signal is determined.

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Zhong Zhang et al., Transactions of Society of Automotive Engineers of Japan, vol. 33, No. 3, Jul. 2002, pp. 37-42.

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