Hydroelastic investigation of a fast patrol boat made of fibre reinforced plastic

Abstract

The aim of this document is to investigate the dynamic behaviour of a fast patrol boat due to wave induce loads using a hydro elastic 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 preliminary two-dimensional beam analysis is conducted by means of the Prohl-Myklestad method where it is intended to derive a first estimate of the first four symmetrical mode shapes. Later a more complex three-dimensional finite element model is developed in order to evaluate the in vacuo modal characteristics until the fourth node symmetrical vertical mode shape, although, t.he latter analysis does not exclude antisymmetric and coupled distortions. The wet hv'zz 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 investigated, 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 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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