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- W1646709833 abstract "Operational Deflection Shape(ODS) analysis technique is an effective tool for trouble shooting of various types of noise and vibration problems. In many ODS analyses so far, stationarity of measured signals is assumed and, then, spectral estimates of the time signals are decomposed to find out the number of independent sources and deflection shape due to each source at specific frequency points of interest. When transient ODS is of interest in conjunction with source identification of transient noise, the conventional ODS technique is possibly inadequate due to shortness of the measurement duration. Wavelet transform, a tool to analyze transient signals inherently, can be a nice alternative to the Fourier transform approach in ODS analysis. Main application of wavelet transform is to catch time-varying characteristics in transient signals. Depending on the type of wavelet employed, the time-varying characteristics can be defined at specific frequency points or constant frequency bandwidth as well as over proportional frequency bandwidth, e.g., an octave or a third octave band. Considering that sound pressure levels are more meaningfully interpreted by the proportional frequency bandwidth analysis, wavelet transform for proportional frequency bandwidth analysis can be an efficient tool in transient ODS for source identification of transient noise. In this paper, basic backgrounds to generate transient ODS from the measured vibration signals using wavelet transform and its application to identification of transient noise source from a steel plate is presented." @default.
- W1646709833 created "2016-06-24" @default.
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- W1646709833 date "1997-02-03" @default.
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- W1646709833 title "Transient operational deflection shape analysis via wavelet transform" @default.
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