Springing Analysis of a Passenger Ship in Waves

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-07-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
19
492-511
Series
Journal of Marine Science and Engineering
Abstract
Traditionally, the evaluation of global loads experienced by passenger ships has been based on closed-form Classification Society Rule formulae or quasi direct analysis procedures. These approaches do not account for the combined influence of hull flexibility, slenderness, and environmental actions on global dynamic response. This paper presents a procedure for the prediction of the global wave-induced loads of a medium-size passenger ship using a potential flow Flexible Fluid Structure Interaction (FFSI) model. The study compares results from direct long-term hydro-structural computations against Classification Society Rules. It is demonstrated that for the specific vessel under consideration: (a) the elastic contributions of the responses on loads are negligible as springing effects occur outside of the wave energy spectrum, (b) deviations of the order of 28% arise by way of amidships when comparing direct hydrodynamic analysis predictions encompassing IACS UR S11A hog/sag nonlinear correction factors and the longitudinal strength standard, and (c) the interpretation of the wave scatter diagram influences predictions by approximately 20%. Based on these indications, it is recommended that further parametric studies over a range of passenger ship designs could help draw unified conclusions on the total influence of global and local hydrodynamic actions on passenger ship loads and dynamic response.
Description
Keywords
Ship dynamics, Hydroelasticity of ships, Flexible fluid structure interactions (FFSI), Long term wave loads, Passenger ships, Design, Performance
Other note
Citation
Tilander , J , Patey , M & Hirdaris , S 2020 , ' Springing Analysis of a Passenger Ship in Waves ' , Journal of Marine Science and Engineering , vol. 8 , no. 7 , 492 , pp. 492-511 . https://doi.org/10.3390/jmse8070492