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Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.ORCID iD: 0000-0002-2093-3073
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: 0000-0002-9110-9401
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.

Place, publisher, year, edition, pages
2014. Vol. 61, no 1-2, 17-39 p.
Keyword [en]
Local slamming, structural loads, high-speed craft, experiments, finite element modeling
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-118808DOI: 10.3233/ISP-130104Scopus ID: 2-s2.0-84898473968OAI: oai:DiVA.org:kth-118808DiVA: diva2:608531
Note

QC 20150624

Available from: 2013-02-28 Created: 2013-02-28 Last updated: 2017-12-06Bibliographically approved
In thesis
1. On Structural Design of High-Speed Craft
Open this publication in new window or tab >>On Structural Design of High-Speed Craft
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
slamming, high-speed craft, finite-element analysis, design methods, experimental analysis, numerical simulations, design loads, statistical analysis
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-118786 (URN)978-91-7501-650-4 (ISBN)
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
2. New Perspectives on Analysis and Design of High-Speed Craft with Respect to Slamming
Open this publication in new window or tab >>New Perspectives on Analysis and Design of High-Speed Craft with Respect to Slamming
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

High-speed craft are in high demand in the maritime industry, for example, in maintenance operations for offshore structures, for search and rescue, for patrolling operations, or as leisure craft to deliver speed and excitement. Design and operation of high-speed craft are often governed by the hydrodynamic phenomena of slamming, which occur when the craft impact the wave surface. Slamming loads affect the high-speed craft system; the crew, the structure and various sub-systems and limit the operation. To meet the ever-increasing demands on safety, economy and reduced environmental impact, there is a need to develop more efficient high-speed craft. This progression is however limited by the prevailing semi-empirical design methods for high-speed planing craft structures. These methods provide only a basic description of the involved physics, and their validity has been questioned.

This thesis contributes to improving the conditions for designing efficient highspeed craft by focusing on two key topics: evaluation and development of the prevailing design methods for high-speed craft structures, and development towards structural design based on first principles modeling of the slamming process. In particular a methodological framework that enables detailed studies of the slamming phenomena using numerical simulations and experimental measurements is synthesized and evaluated. The methodological framework involves modeling of the wave environment, the craft hydromechanics and structural mechanics, and statistical characterization of the response processes. The framework forms the foundation for an extensive evaluation and development of the prevailing semi-empirical design methods for high-speed planing craft. Through the work presented in this thesis the framework is also shown to be a viable approach in the introduction of simulation-based design methods based on first principles modeling of the involved physics. Summarizing, the presented methods and results provide important steppingstones towards designing more efficient high-speed planing craft.

Place, publisher, year, edition, pages
Stockholm: Kungliga tekniska högskolan, 2016. 35 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2016:20
Keyword
Slamming, high-speed craft, finite-element analysis, design methods, experimental analysis, numerical simulations, design loads, statistical analysis
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-190861 (URN)978-91-7595-976-4 (ISBN)
External cooperation:
Public defence
2016-09-29, F3, Lindstedtsvägen 26, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20160907

Available from: 2016-09-07 Created: 2016-08-17 Last updated: 2016-09-07Bibliographically approved

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Razola, MikaelRosén, AndersGarme, Karl

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