International Shipbuilding Progress - Volume 54, issue 4

Authors: Vassalos, Dracos | York, Anthony | Jasionowski, Andrzej | Kanerva, Markku | Scott, Andrew

Article Type: Research Article

Abstract: In anticipation of the forthcoming new harmonised regulations for damage stability, SOLAS Chapter II-1, proposed in IMO MSC 80 and due for enforcement in 2009, a number of ship owners and consequentially yards and classification societies are venturing to exploit the new degrees of freedom afforded by the probabilistic concept of ship subdivision. In this process, designers are finding it rather difficult to move away from the prescription mindset that has been deeply ingrained in their way of conceptualising, creating and completing a ship design. Total freedom it appears is hard to cope with and a helping hand is needed …to guide them in crossing the line from prescriptive to goal-setting design. This will be facilitated considerably with improved understanding of what this concept entails and of its limitations and range of applicability. This paper represents an attempt in this direction, based on the results of a research study, financed by the Maritime and Coastguard Agency in the UK, to assess the design implications of the new harmonised rules on passenger and cargo ships. Show more

Keywords: Probabilistic rules, damage stability, ship design

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 339-361, 2007

Article Type: Other

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 363-363, 2007

Authors: Katayama, Toru | Fujimoto, Masashi | Ikeda, Yoshiho

Article Type: Research Article

Abstract: In this study, the mechanism of a transverse stability loss at super high forward speed is investigated. Towing tank test is carried out to observe the characteristics of the instability and it is confirmed that the instability has strong relationship to the change in running attitude and hydrodynamic roll moment due to high forward speed. Using some existing empirical formulas to estimate the dynamic normal force (lift) on a planing surface, an estimation method of inception of the unstable phenomenon is proposed and its validity is confirmed through comparing with measured results.

Keywords: Planing craft, transverse stability loss, super high forward speed, lift

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 365-377, 2007

Article Type: Other

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 379-379, 2007

Authors: van Walree, F. | de Kat, J.O. | Ractliffe, A.T.

Article Type: Research Article

Abstract: The present paper describes forensic research in to the loss of the trawler MFV Gaul. The research focuses on water ingress through openings in the vessel when operating in a hind cast sea state. The ship, environmental conditions and basics of the FREDYN time domain simulation tool are described. Simulation results are discussed which clearly indicate that certain combinations of heading, speed and resulting water ingress can be threatening to the survivability of the ship. Scale model test results confirm these findings. Finally, a possible loss scenario is presented.

Keywords: MFV Gaul, loss of trawler, forensic hydrodynamic research, time domain simulations, model tests

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 381-407, 2007

Article Type: Other

Citation: International Shipbuilding Progress, vol. 54, no. 4, pp. 409-411, 2007