Analysis of the slowly varying drift force on a very large floating structure in multidirectional random seas |
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Authors: | Shotaro Kida Tomoaki Utsunomiya |
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Institution: | (1) Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto 615-8540, Japan |
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Abstract: | In designing the mooring system of a very large floating structure (VLFS), it is essential to estimate the slowly varying
drift force in random seas. For a small vessel, Hsu's method or Newman's approximation may be used to simulate this slowly
varying drift force. However, based on experiments and/or field observations, it was found that the slowly varying drift force
acting on a VLFS could be reduced to a great extent from the simulated values based on those methods. Thus, the conventional
methods are not applicable for a VLFS. This discovery led to the development of several methods for estimating the slowly
varying drift force on a VLFS, e.g., Namba et al. (J Soc Nav Archit Jpn 186:235–242, 1999), and Shimada and Maruyama (J Soc
Nav Archit Jpn 190:347–351, 2001). However, Namba's method is only applicable to a pontoon-type VLFS with a shallow draft,
and Shimada's method is too simplified to account for the general shape of a VLFS and elastic deformation. These methods have
been expanded in this article, and by our proposed method, any shape of VLFS and the effect of elastic deformation of the
VLFS can be included. Formulations and several numerical examples are given. |
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Keywords: | Slowly varying drift force VLFS Multidirectional random sea |
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