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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:
- Concept development
- General design of ships and offshore objects
- Ship and offshore structural design
- Hydro-mechanics and -dynamics
- Maritime engineering and machinery systems
- Production processes of all types of ships and other objects intended for marine use
- Production technology and material science
- Shipping science, economics, and all directly related subjects
- Ship operations
- Offshore and ocean engineering in relation to the marine environment
- Marine safety
- Efficiency, lifecycle, and environment
- Ice-related aspects for ships and offshore objects.
The contents of the papers may be of a fundamental or of an applied scientific nature and must be of the highest novelty and rigor.
Authors: Zubaly, Robert B.
Article Type: Research Article
Abstract: The average increase in power in waves over that in still water has been determined by calculating added torque and added RPM for a 71,000 deadweight ton tanker on the Persian Gulf to Northern Europe trade route via the Cape of Good Hope. Responses to irregular short-crested multi-directional waves were computed from model tests in regular waves at all headings, based on the linear super-position technique. A family of sea spectra described by the ISSC formulation was used and the occurrence of the spectra on the specified route was determined from the statistical data of Hogben and Lumb. The predicted …added power for this trade route was very modest, ranging downward from 12.6% of the still water power at low speed to only 1.3% at high speed. The effects of wind, currents, fouling, and voluntary slowdowns are not included. The technique is applicable to any ship, any type of response, and any trade route adequately described by the ocean wave statistics. Show more
Citation: International Shipbuilding Progress, vol. 17, no. 189, pp. 149-158, 1970
Authors: Boës, Christian
Article Type: Research Article
Abstract: In this paper the response of a propeller to an unsteady, general velocity field (wake) is analysed. Besides the known parts of the wake, the direct - (homogeneous) and alternating current, a new part is introduced, the noise current which can be recorded by a simply statistical method. This new theory of wake shows that the frequencies of the fluid dynamic forces on the blades are not only integer multiplies of the number of blades and the revolutions of propeller but every frequency appears. Especially the first harmonic of the torque is generated by the noise current.
Citation: International Shipbuilding Progress, vol. 17, no. 189, pp. 159-173, 1970
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