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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.
Authors: Loesberg, P.P.
Article Type: Research Article
Abstract: The article gives a description of a measuring device to determine the position of a ship model in a basin. The position is determined by two light-beams, projected from a laser, the beams being automatically orientated to the model. The direction of the light -beams is controlled by servo-motor driven mirrors, a circular row of triple mirrors installed in the model reflects the light-beams to fotocells. The output voltages of these cells control the servo-systems. The position of the model is obtained in the form of two angles, these angles are transformed, by means of resolvers and electronic analogue dividers, …into the co-ordinates of a Cartesian-system. The light-beams are vertically diverged by means of cylinderlenses, in order to permit vertical motions of the model. The accuracy of the whole system is some centimetres in a basin of 40 × 60 metres. These systems may be built for an area of at least 1000 × 1000 metres. Similar systems may be developed for recording vertical positions. Show more
Citation: International Shipbuilding Progress, vol. 16, no. 182, pp. 301-307, 1969
Authors: Folkers, J.S.
Article Type: Research Article
Abstract: Geometric programming is a mathematical method for restricted optimization of a certain kind of polynomial functions. The purpose of this paper is to apply this method to a problem of preliminary fleet operations analysis. Three versions of this problem are fully discussed with a view to present a working knowledge for the general application of this method to other problems of ship design and operation. The paper is subdivided in two parts, which are both self-consistent. Part I deals with the construction of a transportation model with a number of variants. Results are given without discussion of the method used …for solution. The latter is explained in Part II, which contains an exposition of the theory of geometric programming. The paper has been prepared in part-time co-operation with the Netherlands Ship Model Basin at Wageningen. Show more
Citation: International Shipbuilding Progress, vol. 16, no. 182, pp. 308-326, 1969
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