Partial Reconstruction of Wavelet Transforms: A Technique for Quantifying Amplitude Envelopes of Riser Response Modes

[+] Author and Article Information
J. A. Pelstring, E. E. Waller, D. A. Jordan, R. W. Miksad

Department of Mechanical and Aerospace Engineering, School of Engineering and Applied Science, University of Virginia, Charlottesville, VA

J. Offshore Mech. Arct. Eng 125(4), 225-233 (Oct 01, 2003) (9 pages) doi:10.1115/1.1603310 History: Received January 15, 2002; Revised January 12, 2003; Online October 01, 2003
Copyright © 2003 by ASME
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Amplitude modulated cosine waves with amplitude envelopes measured from wavelet ridge extraction (a)fm/fc=0.1,(b)fm/fc=0.25
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Amplitude modulated cosine waves with amplitude envelopes measured from the inverse wavelet transform (a) fm/fc=0.1, (b) fm/fc=0.25
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Methodology for synthesis of a test signal
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Synthesized signal having characteristics representative of a riser response
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Wavelet transform of synthesized signal in Fig. 4 depicting isolation of modes
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Measured amplitude envelopes of mode six
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Extracted modes of synthesized signal in Fig. 4
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Example acceleration fluctuations measured from the Schiehallion drilling riser with corresponding fourier and wavelet analysis. Case 1: X acceleration at L/4. Case 2: Y acceleration at L/2.
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Amplitude envelopes obtained from Case 1 using partial reconstruction of the windowed regions of the wavelet transform presented in Fig. 8




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