Journal Paper

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Journal: امیرکبیر
Year:1380 | Volume:13 | Issue:49
Start Page:127 | End Page:141

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Title

ANALYTICAL DEVELOPMENT OF VIBRATION SIGNALS ANALYSIS USING DGHM MULTIWAVELET SYSTEM FOR LOCAL FAULTS AND TRANSIENT PHENOMENA DETECTION

Pages

 Start Page 127 | End Page 141

Abstract

 In this paper vibration analysis for local faults and transient phenomena detection, using multiwavelet systems is developed. Unlike the scalar wavelet systems in which their coefficients are scalar parameters, the transformation parameters of multiwavelet systems are vector valued, and their calculation requires some special techniques. In this investigation, having considered the technique used to obtain the scalar wavelet system coefficients as well as the orthogonality of the scale and wavelet functions of multiwavelet systems, the transformation coefficients of the multiwavelet system are calculated, and then some artificial vibration signals are analyzed using the multiwavelet system. The results are compared with those obtained through the scalar wavelet systems and frequency analysis techniques. The combination of the contributions of the analyzed signal at different levels of the multiscale and multiwavelet function spaces results in original signal which shows the validity of the results. One of the main advantages of the multiwavelet systems over the scalar wavelet systems is their ability to analyze the signal in more frequency intervals. Using this property, the detection of the local and transient phenomena from the vibration signals, which may be caused by a small and local defects in a mechanical system, may be performed more efficiently.

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