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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 design of main propulsion shafting systems for modern ships, such as VLCC’s, LNG carriers and high-speed containerships, is to a great extent dictated by the requirement of vibration-free performance in service. It is the purpose of this paper to present a method for predicting analytically in the design stage the coupled transverse vibration characteristics of a given propulsion shaft system and to illustrate it with typical examples. A brief description of the basic problem is first given and this is followed by a review of earlier theoretical work in this field. The transfer matrix approach for the solution …of the problem is then introduced and its computational advantages underscored. Special emphasis is given to the modeling process for shaft segments, propeller, bearings, etc. It is then shown how on the basis of this formulation one can predict the shaft natural frequencies and critical speeds. The SHAFTRAN digital computer program, currently in use by the authors’ firm for routine investigations, is then briefly described. Several examples of this program’s capability are given using actual ship designs. Analytical details are mostly retained in a series of appendices and the paper concludes with a set of recommendations that will increase the accuracy of the calculations. Show more
Citation: International Shipbuilding Progress, vol. 21, no. 239, pp. 193-219, 1974
Authors: Murray, M.T.
Article Type: Research Article
Abstract: It is known that if two-dimensional aerofoil theory is used to calculate the mean forces on a marine propeller blade, the answer obtained is likely to over-estimate the true answer by a factor of typically three. It is shown that when unsteady forces (at blade-rate frequency) are being calculated, the use of unsteady two-dimensional aerofoil theory is much more acceptable, being associated with errors of about 25%. It is pointed out that the more accurate unsteady lifting-surface theory is prohibitively expensive for use regularly as a design tool. and further, that the accuracy of the answer may be limited in …any case by the accuracy of the measured wake data. Show more
Citation: International Shipbuilding Progress, vol. 21, no. 239, pp. 220-225, 1974
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