Traveling waves in mode superposition
Name
719515179-MIT.pdf
Description
Full printable version
Size
5.39 MB
Format
Adobe PDF
Checksum (MD5)
fb4e4338574c2ae030974a63bad2048b
Author(s)
Sheshadri, Aditi
Advisor(s)
J. Kim Vandiver.
Date Issued
2009
Publisher
Massachusetts Institute of Technology
Abstract
Offshore marine risers are subject to Vortex Induced Vibrations (VIV) because of ocean currents. Response prediction techniques which accurately estimate the strain due to VIV are of help in deciding how to mitigate VIV, and also to predict the life of the structure. Experiments conducted in the Gulf Stream provided data about the way long flexible cylinders respond at high mode numbers. The data from these experiments showed that the response of long flexible cylinders is often in the form of traveling waves. Therefore, it was necessary to develop an excitation force model which has traveling wave characteristics. This idea has been implemented earlier using a Green's function approach. This work presents the idea of using mode superposition along with an excitation force model which has traveling wave characteristics. Examples of the implementation of this method are shown. Also, examples where a combination of standing and traveling wave excitation models are used is shown, and these agree well with the experimental data.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 53).
Subjects
Aeronautics and Astronautics.
MIT Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
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reproduction or distribution in any format is prohibited without written
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