Multichannel maximum entropy method of spectral analysis applied to offshore structures
Briggs, Michael Jeffrey
MetadataShow full item record
KeywordOffshore structures; Dynamics; Spectral theory; Entropy; Signal processing; Digital techniques
The multichannel Maximum Entropy Method (MEM) of spectral analysis is developed and applied in the dynamic analysis of offshore structures. Two different algorithms are implemented and compared with the conventional Blackman-Tukey method. These are (1) a direct on the data or Burg method and (2) a Yule-Walker or correlation function extension method. Cross-spectral estimates of magnitude, phase, coherence squared, and transfer function are calculated. These estimates are then used in mode shape identification of a triple decked, single caisson offshore platform. The superiority of the multichannel Maximum Entropy Methods relative to conventional spectral analysis techniques in calculating these cross-spectral estimates and evaluating mode shapes is demonstrated.
Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1981Note: Pages 88-89 do not appear in original document.
Showing items related by title, author, creator and subject.
Vandiver, J. Kim (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1975-01)In fixed offshore structures, damage incurred below the waterline is often difficult to detect, but significant enough to be the source of a subsequent massive failure. A technique is described that can be used to detect ...
Intrinsic nonlinearity and spectral structure of internal tides at an idealized Mid-Atlantic Bight shelf break Zhang, Weifeng G.; Duda, Timothy F. (American Meteorological Society, 2013-12)To quantify dynamical aspects of internal-tide generation at the Mid-Atlantic Bight shelf break, this study employs an idealized ocean model initialized by climatological summertime stratification and forced by monochromatic ...
A novel-type luciferin from Siberian luminous earthworm Fridericia heliota : structure elucidation by spectral studies and total synthesis Petushkov, Valentin N.; Dubinnyi, Maxim A.; Tsarkova, Aleksandra S.; Rodionova, Natalja S.; Baranov, Mikhail S.; Kublitski, Vadim S.; Shimomura, Osamu; Yampolsky, Ilia V. (2014-02)We report structure elucidation and synthesis of the luciferin from the recently discovered luminous earthworm Fridericia heliota. This luciferin represents a key component of a novel ATP-dependent bioluminescence system. ...