Towing dynamics of a liferaft and fast rescue craft in a surface wave |
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| Authors: | W Raman-Nair J Power A Simoes Re |
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| Institution: | aInstitute for Ocean Technology, National Research Council, Arctic Ave., St. John's, NL, Canada A1B 3T5 |
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| Abstract: | The equations of motion for the coupled dynamics of a small liferaft and fast rescue craft in a surface wave are formulated in two dimensions using the methods of Kane and Levinson 1985. Dynamics: Theory and Applications. McGraw-Hill Inc., New York]. It is assumed that the motion normal to the wave surface is small and can be neglected, i.e. the bodies move along the propagating wave profile. The bodies are small so that wave diffraction and reflection are negligible. A Stokes second order wave is used and the wave forces are applied using Morison's equation for a body in accelerated flow. Wind loads are similarly modelled using drag coefficients. The equations are solved numerically using the Runge–Kutta routine “ode45” of MATLAB®. The numerical model provides guidelines for predicting the tow loads and motions of small craft in severe sea states. |
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| Keywords: | Liferaft Fast rescue craft Towing Coupled dynamics |
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