Chapter
Dec 31, 2015
Subharmonic Components in Hawser and Fender Forces
Publication: Coastal Engineering 1976
Abstract
Forces in mooring lines and fenders of a moored vessel exposed to waves have a mixed harmonic and a subharmonic character. The subharmonic oscillations, with periods well beyond the range of wave periods, may cause forces that are as large as, or even larger than the forces associated with the harmonic oscillations.
The origins of the subharmonic oscillations are discussed and it is shown that in model testing, the correct reproduction of both the mooring arrangement and the irregular wave motion is essential.
The subharmonic motions, and consequently the total forces, can be partially reduced by specially adapted mooring arrangements as tests on various mooring systems have shown.
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Published In
Coastal Engineering 1976
Pages: 2840 - 2857
Copyright
© 1977 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Authors
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J. H. van Oorschot
Head Maritime Structures Branch, Delft Hydraulics Laboratory, the Netherlands
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