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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: Haddara, M.R.
Article Type: Research Article
Abstract: The nonlinear equation of rolling motion in random oblique seas is analysed considering parametric excitation caused by transverse stability variation in realistic seaway. Use of Bogoliubov-Mitropolsky’s method of slowly varying parameters together with Stratanovich-Khasminsky’s stochastic averaging is made to obtain an equation describing the variance of the amplitude of rolling motion as a function of time. The condition for stable motion is then derived. Furthermore, stationary variance is expressed in a closed form.
Citation: International Shipbuilding Progress, vol. 27, no. 315, pp. 290-293, 1980
Authors: Chen, Yung-Hsiang
Article Type: Research Article
Abstract: A general study of the stochastic analysis of three-dimensional offshore platforms subjected to earthquake and sea waves is presented in this paper. The entire offshore platform with pile foundation is mathematically modeled by two separated subsystems; one is the main-structure subsystem, and the other is the foundation subsystem. Pile-soil, foundation-structure, and fluid-structure interactions will be included in analysis. The main-structure subsystem can be idealized as a three-dimensional space frame with the lumped parameter system. The pile-foundation subsystem will be replaced by foundation springs and dashpots supporting the main structure in order to simplify this problem. The dynamic properties of such …foundation mechanism are generally frequency dependent and can be determined by using impedance-function technique. As a result the dynamic characteristics of the offshore platform are frequency dependent. The coupling and nonlinear effects of damping term will also be taken into account in analysis. It can be shown that the stochastic analysis will become much more simple and efficient when the concept of generalized complex damping is applied. Show more
Citation: International Shipbuilding Progress, vol. 27, no. 315, pp. 294-304, 1980
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