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On Structural Design of Energy Efficient Small High-Speed Craft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0001-7542-3225
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-8343-5098
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0003-3337-1900
2011 (English)In: Marine Structures, ISSN 0951-8339, Vol. 24, no 1, 43-59 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents an integrated design procedure for determination of structural arrangement and scantlings for the complete structure of small high-speed craft. The purpose of the procedure is to serve as a tool in the preliminary design stage where it enables generation of weight minimized designs with very limited effort. The design procedure is applied in a material concept study for a high-speed patrol craft. The various concepts include single skin and sandwich composites, aluminum and steel. It is demonstrated that the mass of the aluminum hull structure can be reduced from the original 11.7 tonnes to 9.6 tonnes through application of the presented design procedure. The most weight efficient material concept is a carbon-fiber foam-cored sandwich with a structural mass of 4.8 tonnes, which is about 50% less than the refined aluminum version. Through simple hydromechanic analysis, potential for fuel and CO2 emission reductions of 8% for the refined aluminum version and 27% for the carbon-fiber sandwich version in relation to the original craft are indicated.

Place, publisher, year, edition, pages
2011. Vol. 24, no 1, 43-59 p.
Keyword [en]
High-speed craft, Integrated design procedure, Scantlings, Weight minimization, Composites, Material concepts
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-10990DOI: 10.1016/j.marstruc.2011.01.001ISI: 000289124100003ScopusID: 2-s2.0-79952444468OAI: diva2:233746
QC 20100810 Uppdaterad från submitted till published (201100419).Available from: 2009-09-02 Created: 2009-09-02 Last updated: 2011-04-19Bibliographically approved
In thesis
1. Hydroelasticity in Marine Hull Bottom Panels - Modeling and Characterization
Open this publication in new window or tab >>Hydroelasticity in Marine Hull Bottom Panels - Modeling and Characterization
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The work in this thesis is concerned with the localized problem of hydroelasticity in marine panel-water impacts with an overall aim to increase the efficiency of high-speed craft by application of more refined methods in the structural design. The work mainly focuses on numerical modeling of the hydroelastic problem and therewith related aspects in the modeling and characterization of hydroelasticity. In addition, the work also addresses aspects regarding design methods of high-speed craft and experimental analysis of hydroelasticity.

Two-dimensional panel-water impacts are simulated by using the commercial finite element code LS-DYNA. For the modeling of the panel-water impact situations a generalized approach for determination of fluid discretization and contact parameters is derived and extensively used throughout this work. The hydroelastic problem is studied through systematic series of numerical simulations regarding different impact situations. The work advances the understanding of the hydroelastic problem and introduces concepts such as kinematic and inertia related hydroelastic effects. The work further presents hydroelastic effects in contrast to previously published results, in the sense that it may not be conservative to ignore hydroelasticity in the structural design. This increase in the structural response when accounting for hydroelasticity can partly be related to kinematic effects, and partly to inertia related added mass effects. The results further show that, the effects of hydroelasticity increase with increased impact velocity, increased panel width, decreased deadrise angle, decreased panel flexural and in-plane stiffness, and decreased rotational and in-plane fixation at the boundaries.

A tentative method is derived to characterize the hydroelastic problem, which, despite its simplicity and limitations, is found to successfully capture the complexity of the hydroelastic interaction in the design of the experimental setup. The experimental water slam testing of composite hull panels are conducted to study the effect of hydroelasticity for panels with different stiffnesses. The observed hydroelastic effects included changes in panel geometry, local velocity and hydrodynamic pressures. These effects also correlate with the observed hydroelastic effects from the numerical simulations.


Place, publisher, year, edition, pages
Stockholm: KTH, 2009. xi, 20 p.
Trita-AVE, ISSN 1651-7660 ; 2009:42
fluid-structure interaction, hydroelasticity, hull-water impact, high-speed craft, slamming, explicit finite element methods
National Category
Vehicle Engineering
urn:nbn:se:kth:diva-10903 (URN)978-91-7415-389-7 (ISBN)
Public defence
2009-09-16, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
QC 20100810Available from: 2009-09-02 Created: 2009-08-12 Last updated: 2010-08-10Bibliographically approved

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