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On Structural Design of High-Speed Craft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-2093-3073
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The development in structural design and construction of high-speed craft has been extensive during the last decades. Environmental and economical issues have increased the need to develop more optimized structures, using new material concepts, to reduce weight and increase performance efficiency. However, both lack of, and limitations in design methodology, makes this a difficult task.

In this thesis a methodological framework which enables detailed studies of the slamming loads and associated responses for high-speed planing craft in irregular waves is established. The slamming loads can either be formulated based on numerical simulations, or on experimental measurements and pressure distribution reconstruction. Structure responses are derived in the time-domain using finite element analysis. Statistical methods are used to determine design loads and lifetime extreme responses.

The framework is applied to perform phenomenological studies of the slamming loading conditions for high-speed craft, and used to highlight and quantify the limitations in the prevailing semi-empirical method for design load determination with respect to slamming. A number of clarifications regarding the original derivation and the applicability of the prevailing semi-empirical method are presented. Finally, several potential improvements to the method are presented and the associated implications discussed.

The long-term goal of the research project is to establish a method for direct calculation of loads and response for high-speed planing craft, which can enable design of truly efficient craft structures. The methodology and the results presented in this thesis are concluded to be important stepping-stones towards this goal. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , xi, 32 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013-06
Keyword [en]
slamming, high-speed craft, finite-element analysis, design methods, experimental analysis, numerical simulations, design loads, statistical analysis
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-118786ISBN: 978-91-7501-650-4 (print)OAI: oai:DiVA.org:kth-118786DiVA: diva2:608399
Presentation
2013-03-21, D41, Lindstedtsvägen 17, KTH, Stockholm, 11:00 (English)
Opponent
Supervisors
Note

In page VII, Paper B is wrong title. The correct title is "Experiental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft". QC 20130228

Available from: 2013-02-28 Created: 2013-02-27 Last updated: 2013-02-28Bibliographically approved
List of papers
1. On Structural Design of High-Speed Planing Craft with Respect to Slamming
Open this publication in new window or tab >>On Structural Design of High-Speed Planing Craft with Respect to Slamming
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2012 (English)In: 8th International Conference on High-Speed Marine Vehicles, 2012Conference paper, Published paper (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-118806 (URN)
Conference
8th International Conference on High-Speed Marine Vehicles, Mülheim an der Ruhr, Germany, 26-28 September, 2012
Note

QC 20130228

Available from: 2013-02-28 Created: 2013-02-28 Last updated: 2016-09-07Bibliographically approved
2. Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft
Open this publication in new window or tab >>Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft
2014 (English)In: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 61, no 1-2, 17-39 p.Article in journal (Refereed) Published
Abstract [en]

In this paper a methodology that enables detailed studies of the momentary slamming pressure distribution and the related structural loads is presented. The methodology involves pressure measurements, spatial and temporal pressure distribution reconstruction, and finite element analysis. Using a set of model experiments with a high-speed planing craft towed in irregular waves, the methodology is applied to evaluate different slamming pressure models regarding their ability to accurately represent the structure loads. The slamming equivalent uniform pressure model used in the prevailing semi-empirical design methods, and non-uniform time-dependent pressure models used in a method for direct calculation, are considered. It is concluded that for smaller structure members, typically found in densely spaced metal structures, the uniform pressure model performs well with respect to accurately representing the structure loads. However, for larger members found in modern sandwich structures, the underestimation of structure loads is significant, especially with respect to the shear forces. The non-uniform pressure modeling technique is concluded to be promising regarding its ability to accurately represent the structure loads, regardless of structure member size. The presented methodology is concluded to be a useful tool in further research regarding the evaluation and development of methods for high-speed craft structural design.

Keyword
Local slamming, structural loads, high-speed craft, experiments, finite element modeling
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-118808 (URN)10.3233/ISP-130104 (DOI)2-s2.0-84898473968 (Scopus ID)
Note

QC 20150624

Available from: 2013-02-28 Created: 2013-02-28 Last updated: 2017-12-06Bibliographically approved
3. Allen & Jones Revisited
Open this publication in new window or tab >>Allen & Jones Revisited
(English)Manuscript (preprint) (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-118809 (URN)
Note

QS 2013

Available from: 2013-02-28 Created: 2013-02-28 Last updated: 2013-02-28Bibliographically approved

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