Thesis

Dynamic stability assessment of damaged passenger ships using a time simulation approach

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Awarding institution
  • University of Strathclyde
Date of award
  • 1993
Thesis identifier
  • T7532
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Abstract
  • In the transition from deterministic to probabilistic approaches to assessing the damage survivability of passenger ships this PhD study seeks to draw attention to the key need in regard to loss prevention - the need to address damage survivability by taking full account of vessel dynamics in realistic environments. The thesis begins by critically reviewing the development of subdivision and damage stability requirements, emphasising the inherent weaknesses in the existing approaches to assessing damage survivability. The approach adopted in this thesis is then described. This is based on real time simulation of the dynamic behaviour of the damaged vessel in realistic wind and wave conditions. The mathematical model comprises coupled sway-heave-roll motions in beam seas while taking into consideration progressive flooding as well as water accumulation. A series of comprehensive model experiments have been specifically designed and undertaken to investigate the nature and magnitude of couplings in the above modes of motion in upright and inclined conditions. The damage survivability of the vessel is examined by considering a number of damage scenarios, chosen on the basis of maximising the danger of potential capsize (or sinkage) while taking into account actual accident records. The practical applicability of the proposed procedure is demonstrated by means of a parametric investigation aimed at identifying the effect of a number of key parameters on the damage survivability of a modern car/passenger ferry. These include: wave height; wave length; wind speed; flooding; water accumulation; location and extent of flooding; loading. The results of the investigation are presented and discussed. On the basis of these results boundary stability curves are proposed as a substitute for existing still-water damage stability criteria. These curves involve relationships between design and environmental parameters and inherent stability-related parameters.
Resource Type
DOI
EThOS ID
  • uk.bl.ethos.493310
Date Created
  • 1993
Former identifier
  • 89878

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