Hull stability characteristics for single-screw cargo ships determined by regression analysis

Article type: Research Article

Authors: Cassella, P.

Affiliations: Istituto di Architettura Navale, Universita’ degli Studi di Napoli, Italy

Abstract: The paper deals with a method to evaluate, at first stage of design already, statical and dynamical stability of a single screw cargo ship for any loading condition. D.T.M.B.’s series 60 and B.S.R.A.’s cargo ship standard series parent hulls with a reference displacement volume of 10,000 m3 at design draught have been examined. Relative buoyancy characteristics have been calculated and results have been normalized by means of geometrical similarity because of the different beam to draught ratios presented by the two series. Obtained data have been analyzed by regression technique on the basis of block coefficient CB, moulded depth to draught ratio D/T, hull transverse angle and ratio of buoyant volume to displacement volume at design draught. A polynomial representation of CB coordinates is given for each series examined as well as for the series all together. A worked example has been carried out for two real ships and results fit fine previously calculated cross curves.

DOI: 10.3233/ISP-1984-3135402

Journal: International Shipbuilding Progress, vol. 31, no. 354, pp. 34-48, 1984