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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.
Article Type: Research Article
Abstract: We present corrected curves and data for the method of fitting ratio-of-polynomials form-fit of seawave spectra, e.g. Pierson-Moskowitz spectra, originally published in Reference . Additionally we provide information concerning the design of suitable filters which may be useful in simulating waves in experimental tanks or in simulation exercises.
Citation: International Shipbuilding Progress, vol. 32, no. 365, pp. 2-5, 1985
Authors: Wang, Long-Wen
Article Type: Research Article
Abstract: A controllable transom flap in planing boats not only may reduce the resistance at cruising speeds in still water, but also could be designed to make a boat run at or near optimum attitude in various environments, which results in a reduction in both resistance and vertical motion in waves. In the present study, considering the controllable flap as an exciting force and moment, the motion equations of high speed planing boats with controllable flaps in regular waves have been based on a modified strip theory. An attempt is made to evaluate the feasibility and effectiveness of the controllable …flap as a means of controlling the running trim to optimize the overall performance. The theoretical calculation pointed out that when the force and moment excited by flaps were in phase with wave disturbances considerable vertical motions would be set up, but once a suitable phase could be established between flap exciting forces and wave disturbances, the controlled flaps would reduce the motion amplitudes effectively. Model tests carried out in the Ship Hydromechanics Laboratory of the Delft University of Technology have also shown that controllable flaps may be used not only for minimizing resistances in various conditions, but also for reducing heave and pitch motions, especially at or near the resonant frequency. The tests also proved that in automatic systems of controlling flaps, a pitch velocity feedback to the flap is effective. Show more
Citation: International Shipbuilding Progress, vol. 32, no. 365, pp. 6-23, 1985
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