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EnglishLeisure boats market has constantly grown during the latest years entailing an increasing need of design tools, dealing with technical problems like seakeeping of planing boats, whose complexity still present a high challenge for designers. The present paper describes a methodology for the calculation in time domain of the vertical motions of a planing boat in head waves, capable of predicting the non-linear vertical motions of the boat in both regular / irregular head waves. The formulation makes recourse to a ‘strip-theory’ approach to get the 3D hydrodynamic forces as a linear superposition of the sectional forces. The determination of the 2D planing forces is based on ‘momentum theory’ using Wagner’s wedge-theory to model the sectional characteristics, while non-linear Froude-Krylov forces are directly evaluated accounting the relative motions at each cross-section. Moreover, from the time-series of the vertical motions an overall passenger comfort index and slamming pressures are evaluated. A validation of the code is presented against the model-test results available in literature.
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| Titolo: | A Momentum Theory Approach to the Seakeeping of Planing Crafts | |
| Autori: | ||
| Data di pubblicazione: | 2008 | |
| Abstract: | Leisure boats market has constantly grown during the latest years entailing an increasing need of design tools, dealing with technical problems like seakeeping of planing boats, whose complexity still present a high challenge for designers. The present paper describes a methodology for the calculation in time domain of the vertical motions of a planing boat in head waves, capable of predicting the non-linear vertical motions of the boat in both regular / irregular head waves. The formulation makes recourse to a ‘strip-theory’ approach to get the 3D hydrodynamic forces as a linear superposition of the sectional forces. The determination of the 2D planing forces is based on ‘momentum theory’ using Wagner’s wedge-theory to model the sectional characteristics, while non-linear Froude-Krylov forces are directly evaluated accounting the relative motions at each cross-section. Moreover, from the time-series of the vertical motions an overall passenger comfort index and slamming pressures are evaluated. A validation of the code is presented against the model-test results available in literature. | |
| Handle: | http://hdl.handle.net/11567/241157 | |
| ISBN: | 9781605604602 | |
| Appare nelle tipologie: | 04.01 - Contributo in atti di convegno |
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