Research Article
Dec 1982
Motion Characteristics of Floating Structures
Publication: Journal of the Engineering Mechanics Division
Volume 108, Issue 6
Abstract
An engineering approach to the time domain analysis which accounts for the effects of damping is developed for the purpose of evaluating the rigid body response motion of a two-dimensional floating body confined in a fixed basin. The frequency dependent added mass coefficients are first obtained under the assumption of an ideal fluid. Then the equations of motion in the frequency domain are constructed by artificially introducing the damping coefficients. Frequency response functions then follow logically from these equations of motion and are inverse-Fourier transformed to produce the impulse response functions. Essentially, three forms of damping coefficients are considered and experiments are then performed to determine how well these forms reproduce the experimental results. The optimum values of the damping ratios are also estimated from the experiments and their use for the analysis of large scale floating bodies is suggested. Finally, the causality conditions are verified numerically and it is found that they are satisfied at acceptable levels of engineering accuracy.
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Published In
Journal of the Engineering Mechanics Division
Volume 108 • Issue 6 • December 1982
Pages: 1277 - 1296
Copyright
© 1982 American Society of Civil Engineers.
History
Published in print: Dec 1982
Published online: Feb 3, 2021
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Authors
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Akira Nishitani
Post-Doctoral Research Assoc., Dept. of Civ. Engrg. and Engrg. Mechanics, Columbia Univ., New York, N.Y. 10027
Masanobu Shinozuka, M.ASCE
Renwick Prof. of Civ. Engrg., Dept. of Civ. Engrg. and Engrg. Mechanics, Columbia Univ., New York, N.Y. 10027
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.