Springing Analysis of a Passenger Ship in Waves

Jeremias Tilander, Matthew Patey, Spyros Hirdaris

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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.
Original languageEnglish
Article number492
Pages (from-to)492-511
Number of pages19
JournalJournal of Marine Science and Engineering
Volume8
Issue number7
DOIs
Publication statusPublished - 5 Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Ship dynamics
  • Hydroelasticity of ships
  • Flexible fluid structure interactions (FFSI)
  • Long term wave loads
  • Passenger ships

Field of art

  • Design
  • Performance

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  • Projects

    SA Profi2 Cheirdaris T20404

    Mäkelä, K. & Hirdaris, S.

    01/04/201631/08/2020

    Project: Academy of Finland: Competitive funding to strengthen university research profiles

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