This paper examines wave response of a truncated floating cylinder placed on the centerline of a channel. The multipole expansion method is employed to solve the diffraction/radiation problems of the velocity potentials for water waves. The method can exactly satisfy the boundary conditions on the channel walls, and the convergence of the series in terms of the Fourier mode is excellent. In order to validate the present method, the heave and the pitch responses of a truncated cylinder in a channel have also been obtained experimentally and compared with the analytical results. The method has been successfully applied to predict dynamic response of a floating bridge due to waves.
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