Abstract
Any floating body placed in a wave environment experiences a time-varying loading pattern which has two components. There is a linear part of the time-varying loads which causes the body to oscillate at frequencies in the region in which most of the surface gravity waves appear. In general, these loads have the most influence on roll, pitch and heave motions or alternatively those which have hydrostatic restoring forces (or moments). There is also a nonlinear part of the time-varying loads which may be very significant. For moored ships, this nonlinear part has an important effect on sway, surge and yaw motions particularly if it (the nonlinear part of the time-varying loads) coincides with one of the ships natural periods in these modes. For free-ships, this nonlinear part is responsible for the well-known drifting force. For a free ship, one could say that the sway, surge and yaw have zero frequency or infinite period.
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© 1970 Plenum Press, New York
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Muga, B.J., Wilson, J.F. (1970). Linear Moored-Ship Systems. In: Dynamic Analysis of Ocean Structures. Ocean Technology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1848-4_12
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DOI: https://doi.org/10.1007/978-1-4684-1848-4_12
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