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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: This paper describes a hybrid computer simulation of ship maneuvering during underway-replenishment operations. Two identical Mariner class merchant ships are used in this study. However, the simulation is easily adapted to any class of surface ship. The ships dynamics are simulated on an EAI 680 analog computer, while the nonlinear interaction forces are generated on a PDP-15 (DEC) digital computer. This first phase of the project considers only the interaction effects on the leading ship due to the close proximity of the tracking ship. Computer rims are made to study control of the leading ship for various fixed …lateral and longitudinal separation distances. Manual control of the leading ship is also undertaken as the tracking ship passes. Preliminary studies indicated that the variables necessary for control of the leading ship in this idealized underway replenishment operation are: yaw angle, yaw angle rate of change with time, longitudinal and lateral separation between the ships, shaft revolutions per minute, and rudder angle. Phase II of this project will include the mutual interactions between the two ships and the effects of a sea state. Phase III will be directed to establishing the essential control variables needed for ship control during underway replenishment and the required accuracies of these variables. Show more
Citation: International Shipbuilding Progress, vol. 21, no. 241, pp. 259-275, 1974
Authors: Flower, J.O.
Article Type: Research Article
Abstract: A method based upon Laplace transforms for obtaining approximate analytical solutions to some non-linear steering equations is presented. The method is straightforward to apply and has the advantage over numerical solutions that insight into the effect of various parameters is afforded.
Citation: International Shipbuilding Progress, vol. 21, no. 241, pp. 276-280, 1974
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