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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: Booth, T.B.
Article Type: Research Article
Abstract: The stability of the motion of an underwater vehicle is usually examined for the condition of neutral buoyancy. In this paper the stability of an ascent to the surface under the action of positive buoyancy is examined. It is shown that both the longitudinal and the lateral motions may be unstable. Criteria are established. In this part, ascents whose motion is predominantly forward are examined. Lateral instability is shown to be caused by excessive buoyancy and a divergent motion in roll and yaw then occurs. In Part II, near-vertical ascents are examined. These also are unstable if the buoyancy is …excessive. Show more
Citation: International Shipbuilding Progress, vol. 24, no. 279, pp. 297-305, 1977
Authors: Ferdinande, V.
Article Type: Research Article
Abstract: An analysis of the non-dimensional representation of the uni-directional wave energy spectrum is developed. The standard I.T.T.C./I.S.S.C. spectrum formula proves to be one of the correctly derived formulations, but the assessment of the characteristic period and the significant wave height can be criticized. For an available collection of wave spectra, gathered by Ceberena on the North Atlantic, the best adapted Bretschneider expression is formulated. As even this formula does not give satisfaction in matching the average of the actual measured spectra, there is little hope of arriving at any proper mathematical spectrum formulation in the future. Therefore, a general …procedure is proposed, which may lead to a representative curve of dimensionless spectral densities versus frequency. This curve for a given sea area, with indication of standard deviations, might be a better base for deriving realistic wave spectra of known visual heights and periods, and therefore be a better tool for the short-term and long-term prediction of ship responses. Show more
Citation: International Shipbuilding Progress, vol. 24, no. 279, pp. 306-318, 1977
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