Damping estimation, response prediction and fatigue calculation of an operational single pile platform
Cook, Michael F.
MetadataShow full item record
LocationGulf of Mexico
A comparison between predicted and measured damping controlled dynamic response of an operational single pile platform (AMOCO's South Marsh Island Block 33B platform) is presented. In the predictive analysis, a finite element model of the structure and a theoretical assessment of damping phenomena are combined with a response prediction method which utilizes the principle of reciprocity of ocean waves. The result is a versatile expression for the estimation of the dynamic response fatigue life of a platform in a directionally spread sea. In addition, the data analysis performed on wind, wave and response time histories, recorded in March, 1980, is carefully described. A method is presented which uses biaxial accelerometer data to infer platform modal orientations and to estimate wave spreading. Finally, modal natural frequencies and damping ratios are estimated using the Maximum Entropy Method (MEM) of spectral analysis. Good agreement between predicted and estimated response characteristics is attained.
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 January 1982
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 ...
Hoyt, Joshua King (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1986-05)The Flying Fish is an autonomous, streamlined, gravity driven underwater vehicle of high speed (15 knots) vertical excursions to depths of 6000 meters. This prototype uses short baseline acoustic interferometry to guide ...
Berteaux, Henri O.; Walden, Robert G. (Woods Hole Oceanographic Institution, 1978-12)The design of an oceanographic platform can be defined as the rational specification of the platform dimensions and geometry. This specification is usually the result of an iterative process which compares the ...