International Shipbuilding Progress - Volume 13, issue 139

Authors: Aertssen, G.

Article Type: Research Article

Abstract: Up to this day extensive model tests and carefully conducted measured-mile trials were carried out on three Belgian cross-channel twin-screw motor ships, two passenger ships and one car-ferry. The three ships were equipped with torsionmeters, two of them had thrustmeters installed. The measured-mile trial data were satisfactory and this allowed the Centre Belge de Recherches Navales to carry out a compared analysis of the propulsive properties of the three ships in smooth water.

DOI: 10.3233/ISP-1966-1313901

Citation: International Shipbuilding Progress, vol. 13, no. 139, pp. 71-77, 1966

Authors: Walderhaug, H.Aa.

Article Type: Research Article

DOI: 10.3233/ISP-1966-1313902

Citation: International Shipbuilding Progress, vol. 13, no. 139, pp. 78-84, 1966

Authors: Radosavljević, Lj.B.

Article Type: Research Article

Abstract: From the conditions providing that, under static equilibrium, both the variable immersed displacement of a ship due to the transition of the still surface of the sea to a seaway, and the its variable moment with respect to the transverse axis of the ship must be equal to zero, the author of the present paper determines the laws governing the changes of ship’s coordinate parameters in order to ensure at any instant the static equilibrium of the ship. By using these laws, the author proceeds then to evaluate an analytical expression of the ship’s bending moment in a seaway …under static equilibrium. Show more

DOI: 10.3233/ISP-1966-1313903

Citation: International Shipbuilding Progress, vol. 13, no. 139, pp. 85-90, 1966

Authors: Bhattacharya, R.N.

Article Type: Research Article

Abstract: In an earlier paper by the present author [1] the generation of liquid motion by a source starting to move horizontally with a uniform velocity slightly below the free surface was considered as an initial value problem. It was found that a steady state of motion would be attained and the elevation of the free surface was obtained in the form of an integral. As the attainment of the steady state and the law of decay of the transient part of the disturbance were the main points in the above article, the steady state integral was not given any close …attention. This integral has been carefully examined in the present paper and the results obtained justify the efforts made. Not only all the principal features of the ship waves have been obtained but most of the singularities inherent in Kelvin’s moving pressure point model for a ship have been got around. Show more

DOI: 10.3233/ISP-1966-1313904

Citation: International Shipbuilding Progress, vol. 13, no. 139, pp. 91-97, 1966