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On high-speed craft acceleration statistics
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Centre for Naval Architecture)ORCID iD: 0000-0002-2093-3073
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Centre for Naval Architecture)
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Centre for Naval Architecture)ORCID iD: 0000-0002-9110-9401
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems. (Centre for Naval Architecture)ORCID iD: 0000-0002-8343-5098
2016 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 114, 115-133 p.Article in journal (Refereed) PublishedText
Abstract [en]

Design and operation of high-speed planing craft is ruled by the hydrodynamic impact loads and the related craft responses occurring at violent wave encounters. Simulation, measurement and characterization of these loads and responses is however far from trivial. Hereby the general knowledge about these processes is actually rather limited and it is common to rely on simple semi-empirical formulas when designing and analyzing high-speed craft. This paper presents a unique set of impact acceleration data for a high-speed craft in waves, generated based on non-linear strip simulations. Methods and measures for statistical characterization of the acceleration process are established and evaluated, and by application of these methods on the simulation data a number of issues are clarified, for example: slamming time scales and selection of appropriate sampling rates and filtering levels; identification of peak values in acceleration signals; statistical distributions and convergence; and the relation between the statistical peak fraction averages that are commonly used as design parameters and the actual extreme values. The established methods and generated results form a valuable basis for setting up and analyzing high-speed craft experiments and simulations, and for validating and updating the prevailing semi-empirical methods.

Place, publisher, year, edition, pages
2016. Vol. 114, 115-133 p.
Keyword [en]
Slamming, High-speed craft statistics, Acceleration, Experiments, Simulations
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-185379DOI: 10.1016/j.oceaneng.2016.01.004ISI: 000372382000011ScopusID: 2-s2.0-84957010524OAI: oai:DiVA.org:kth-185379DiVA: diva2:920400
Note

QC 20160418

Available from: 2016-04-18 Created: 2016-04-18 Last updated: 2016-09-07Bibliographically approved
In thesis
1. 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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