Abstract
Direct stability assessment requires a significant computational time since stability failures, which are very rare in practically relevant cases, should be encountered in numerical simulations. The problem can be simplified if stability failures can be assumed independent and thus described as a Poisson process, which requires neutralization of self-repetition, transient effects and autocorrelation of big roll motions, solutions for which are proposed in the paper. Two other simplifications considered here are the extrapolation of the stability failure rate over significant wave height and reduction of the assessment to few design situations. In the former method, the failure rate is defined from numerical simulations at large significant wave heights, where the failure rate is large, and extrapolated to lower significant wave heights. In the design situations method, the assessment is performed for few selected combinations of the significant wave height, mean wave period, wave direction and ship speed. Both methods are applied to five ships (a cruise and a RoPax vessels and three container ships), each in six loading conditions, and demonstrate a significant reduction in the required simulation time. Recommendations for practical application of these methods are provided.
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Shigunov, V. (2023). Simplifications in Direct Stability Assessment. In: Spyrou, K.J., Belenky, V.L., Katayama, T., Bačkalov, I., Francescutto, A. (eds) Contemporary Ideas on Ship Stability. Fluid Mechanics and Its Applications, vol 134. Springer, Cham. https://doi.org/10.1007/978-3-031-16329-6_6
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DOI: https://doi.org/10.1007/978-3-031-16329-6_6
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