Publications

Santos, F.M., Temarel, P.A. and Guedes Soares, C. (2009), “On the limitations of two- and three-dimensional linear hydroelasticity analyses applied to a fast patrol boat”, Journal Engineering for the Maritime Environment, Issue 152, pp. 457-478

The aim of this paper is to study the dynamic behaviour of a fast patrol boat due to wave induced loads using a Hydroelastic approach. This includes two and three dimensional idealisations for dry hull analysis and three-dimensional wet hull analysis for both idealisations. Regarding dry hull analysis a two-dimensional beam and three-dimensional finite element panel model is developed in order to evaluate the in vacuo modal characteristics until the fourth node symmetrical vertical mode shape, although, the latter analysis does include antisymmetric and coupled distortions. The wet hull analysis includes a three dimensional hydrodynamic analysis, based on a singularity distribution on the mean wetted surface, for both non-uniform beam and three dimensional structural model idealisations. The algorithm used for the evaluation of the Green's function for the pulsating source is based on a method using asymptotic and Taylor series. Three heading angles are studied, i.e. 180, 135 and 90 degrees for regular waves of varying frequency. Results from full scale trials are also presented in order to compare rigid body motions transfer functions with numerical predictions. The document reports that the evaluation of the dynamic behaviour of the fast patrol boat, with small length to beam ratio, by means of a unified Hydroelastic analysis, showed some inherent limitations of a beamlike approach for this particular type of vessels.

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