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The journal International Shipbuilding Progress (ISP) was founded in 1954. Each year four issues appear (in April, July, September and December). Publications submitted to ISP should describe scientific work of high international standards, advancing subjects related to the field of Marine Technology, such as:
The contents may be of a pure scientific or of an applied scientific nature.
Article Type: Research Article
Abstract: The paper deals with analytical-numerical and computer-aided methods to simulate large amplitude roll motions and to evaluate the dynamic stability of ships in waves. A simplified but fundamental equation of roll motion is set up accounting for the characteristic nonlinearities in the damping and restoring term, the latter including the coupling with heave motion, a constant bias and regular wave excitation. The methods employed for studying the roll response and the stability of the formulated nonlinear differential equation are a second-order perturbation expansion, a Runge-Kutta numerical procedure and alternatively an analog-digital computer code, namely CSMP (Continuous System Modelling …Program). The latter is herein applied in the framework of a Computer-Aided Ship Design Procedure. Comparisons are made with published experimental and numerical results for a frigate model, known from W.B. Marshfield and others. It is shown that the presented methods are valuable tools in evaluating the dynamic stability and in predicting the capsizing of ships in waves. However, the mathematical model implied for the roll motions needs further refinement. Show more
Citation: International Shipbuilding Progress, vol. 34, no. 399, pp. 198-206, 1987
Article Type: Research Article
Abstract: There exists a requirement for simple realistic mathematical models for use in ship-manoeuvring simulation studies. McCallum  introduced the Force Mathematical Model which suggested a novel way to approach the problem. This communication is concerned with estimating hydrodynamically-generated forces experienced by the hull in a translational motion for use in the modelling process by a physically appealing method. The technique utilizes slender-body theory supplemented by experiments undertaken in a fairly basic wind-tunnel. The procedure, although by no means an exact one, has the advantage of being quite general in application, supplying parameters for mathematical models which can be used effectively …in microcomputer-based ship simulation exercises. Show more
Citation: International Shipbuilding Progress, vol. 34, no. 399, pp. 207-216, 1987
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