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A scatter diagram approach to the selection of design currents for prediction of marine riser vortex-induced vibration

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dc.contributor.advisor J. Kim Vandiver. en_US
dc.contributor.author Donnelly, Jessica Mary en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Ocean Engineering. en_US
dc.date.accessioned 2006-07-13T15:23:20Z
dc.date.available 2006-07-13T15:23:20Z
dc.date.copyright 2004 en_US
dc.date.issued 2004 en_US
dc.identifier.uri http://hdl.handle.net/1721.1/33425
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004. en_US
dc.description Includes bibliographical references (leaf 25). en_US
dc.description.abstract This paper describes a scatter diagram approach for the classification of large numbers of current profiles for use in the prediction of riser fatigue damage due to vortex-induced vibration. Scatter diagrams have long been used to characterize the probability of various combinations of wave height and period, which are then used to assess wave forces. To predict VIV fatigue damage the designer needs to know which current profiles have the combined property of long regions of relatively constant velocity and relatively high speed. A sorting algorithm is proposed which searches every current profile for long regions of relatively constant flow speed. The probability of each length and speed combination is assessed and the data is used to populate the bins of the scatter diagram. The designer need only select relatively few representative profiles for detailed VIV analysis from those bins that would account for the most damage. The method is tested by making comparison to a brute force approach in which each of many thousands of profiles is evaluated for fatigue damage by running it in the SHEAR7 VIV response prediction program. en_US
dc.description.statementofresponsibility by Jessica Mary Donnelly. en_US
dc.format.extent 49 leaves en_US
dc.format.extent 2451416 bytes
dc.format.extent 2453365 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.rights.uri http://dspace.mit.edu/handle/1721.1/7582
dc.subject Ocean Engineering. en_US
dc.title A scatter diagram approach to the selection of design currents for prediction of marine riser vortex-induced vibration en_US
dc.title.alternative (cont.) This scatter diagram method could reduce the cost of risers by reducing the over- conservatism that is introduced by the common practice of using an envelope design current profile. It also reduces the analysis time required for the brute force approach by allowing the designer to focus on only the most relevant profiles. en_US
dc.type Thesis en_US
dc.description.degree S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Ocean Engineering. en_US
dc.identifier.oclc 62867777 en_US


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