International Shipbuilding Progress - Volume 13, issue 141

Authors: Radosavljević, Lj.B.

Article Type: Research Article

Abstract: In order to make the analytical method for determination of the ship’s bending moment in a seaway under static equilibrium more easily accessible for use in everyday engineering practice, the author provides in this paper an approximate solution of the problem. This approximation consists in the fact that the author instead of taking into consideration ship’s actual lines assumes them to be of a convenient mathematical form. Thus the author was able to express all the constants required for the evaluation of the bending moment under static equilibrium as functions of the ship’s main dimensions and of various coefficients, …which depend upon the waterplane coefficient. The author evaluated all these coefficients and presented their numerical values in the form of tables, which can be used in practice for rapid orientational calculations. Show more

DOI: 10.3233/ISP-1966-1314101

Citation: International Shipbuilding Progress, vol. 13, no. 141, pp. 133-137, 1966

Authors: Svennerud, A.

Article Type: Research Article

Abstract: The present paper deals with some fundamental, mathematically describable properties of the hull displacement distribution, which don’t seem to have been treated previously in ship technical literature. The practical application is chiefly aimed at the calculation of still water shear forces and bending moments in ships of full form with long parallel middle body, in arbitrary trim conditions. In order that the computing method may be used in the most efficient way, the hydrostatic curves should be supplemented with the following coefficients: 1. Prismatic coefficient, φ . 2. Position of the half-section, h according …to eq. (10). 3. Shift of the half-section, in terms of the shift of the centre of buoyancy, at a small change of trim, ζ H / ζ B according to eq. (18a). 4. The buoyancy double-moment factor at the half-section, i.e. the minimum value μ O . Prismatic coefficient, φ . Position of the half-section, h according to eq. (10). Shift of the half-section, in terms of the shift of the centre of buoyancy, at a small change of trim, ζ H / ζ B according to eq. (18a). The buoyancy double-moment factor at the half-section, i.e. the minimum value μ O . All these coefficients can easily be computed together with the usual hydrostatic data, and they are sufficient for an exact calculation of the shear forces and bending moments within the parallel middle body. To make an application of the method possible also at an early stage of the design, one chapter of the paper deals with calculation of approximate values of the relevant hydrostatic data. In an appendix (App. III) the possibilities are discussed of estimating also the wave induced bending moments and shear forces, in order that the total load distribution on the hull may be determined. Show more

DOI: 10.3233/ISP-1966-1314102

Citation: International Shipbuilding Progress, vol. 13, no. 141, pp. 138-160, 1966