A method for predicting effects of propeller-hull configurations on vibratory excitation of ships

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A method for predicting effects of propeller-hull configurations on vibratory excitation of ships

Breslin, J.P. / Tsakonas, S. / Valentine, D.

An outstanding problem in regard to the design of ships is the selection of the propeller geometry and the location of the propeller in the aperture in order to reduce the sum of the propeller-induced vibratory bearing forces and moments and the hull surface forces and moments to an aceeptable minimum. This paper presents a reliable method to predict these net excitations for quite arbitrary stern and propeller configurations. A computer solution for the propeller and hull excitations has been developed and assessed for its adequacy by comparisons with two sets of model measurements made at David Taylor Naval Ship Research and Development Center and at MIT. The paper describes in physical terms the flow mechanical aspects which are incorporated in the theoretical models of propeller in the given ship wake and that for the hull in the presence of the propeller. Although the method is currently limited to non-cavitating propellers, it can embrace the dominating excitations arising from intermittent blade cavitation.(Wassmann)