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Fatigue limit state design of fast boats
AbstractTypically, the dominant load for the structural design of a planing hull is slamming, while sailing fast at head seas. The slamming is a violent fluid structure interaction, where dynamics, hydro-elasticity, and nonlinear structural effects may be important. Considering these effects in a rational design may reduce the scantlings as compare to design by rules, which assess the scantlings by applying a quasi-static design pressure and linear beam theory. More substantial reduction of the scantlings is expected in a limit state design, where extreme loading conditions and flexible structure increase the importance of hydro-elasticity and non-linearity. While applied rules specify allowable stresses that typically provide a service life of 20 years, without the need to check for fatigue; rational limit state design must incorporate the Fatigue Limit State (FLS). This paper presents a rational limit state design method for planing hulls, which apply hydro-elastic nonlinear dynamic structural analysis, to assess the fatigue service life, based on an operation plan specified by the client. The method integrates design rules with direct analysis of fluid-structure interaction and principles of representation of random sea, to a practical design procedure. Furthermore, a parametric analysis is applied to provide a database of 450 cases that may be used by designers for the assessment of fatigue service life in a practical range of geometrical parameters and service conditions. A design example demonstrates the potential of the method to reduce the scantlings.
HighlightsWe present a new rational limit state design method for planing hulls.The method applies hydro-elastic nonlinear dynamic structural analysis, to assess the fatigue service life.The method integrates design rules with FSI analysis and representation of random sea; to a practical design procedure.A parametric analysis provides a database of 450 cases, usable to assess the fatigue service life of fast boats.A design example demonstrates the potential of the method to reduce the scantlings.
Fatigue limit state design of fast boats
AbstractTypically, the dominant load for the structural design of a planing hull is slamming, while sailing fast at head seas. The slamming is a violent fluid structure interaction, where dynamics, hydro-elasticity, and nonlinear structural effects may be important. Considering these effects in a rational design may reduce the scantlings as compare to design by rules, which assess the scantlings by applying a quasi-static design pressure and linear beam theory. More substantial reduction of the scantlings is expected in a limit state design, where extreme loading conditions and flexible structure increase the importance of hydro-elasticity and non-linearity. While applied rules specify allowable stresses that typically provide a service life of 20 years, without the need to check for fatigue; rational limit state design must incorporate the Fatigue Limit State (FLS). This paper presents a rational limit state design method for planing hulls, which apply hydro-elastic nonlinear dynamic structural analysis, to assess the fatigue service life, based on an operation plan specified by the client. The method integrates design rules with direct analysis of fluid-structure interaction and principles of representation of random sea, to a practical design procedure. Furthermore, a parametric analysis is applied to provide a database of 450 cases that may be used by designers for the assessment of fatigue service life in a practical range of geometrical parameters and service conditions. A design example demonstrates the potential of the method to reduce the scantlings.
HighlightsWe present a new rational limit state design method for planing hulls.The method applies hydro-elastic nonlinear dynamic structural analysis, to assess the fatigue service life.The method integrates design rules with FSI analysis and representation of random sea; to a practical design procedure.A parametric analysis provides a database of 450 cases, usable to assess the fatigue service life of fast boats.A design example demonstrates the potential of the method to reduce the scantlings.
Fatigue limit state design of fast boats
Neuberg, Or (author) / Drimer, Nitai (author)
Marine Structures ; 55 ; 17-36
2017-05-06
20 pages
Article (Journal)
Electronic Resource
English
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