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submarine-pipelines
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Obtaining optimal performance with ring stiffeners on strength for submarine pipeline
, Article World Applied Sciences Journal ; Volume 15, Issue 11 , 2011 , Pages 1494-1502 ; 18184952 (ISSN) ; Shamsai, A ; Rahmani, K ; Showkati, H ; Sharif University of Technology
Abstract
Submarine pipelines as the principal structural components are prone to fail by circumferential buckling under the effect of hydrostatic external pressure. Basically, the buckling capacity of a thin-walled pipe is dependent on "radius to thickness" ratio. At least two modes of local and overall buckling are possible in any pipeline system, which could be developed in pipe wall. A method of strengthening of pipes is developed in this paper to stop the failure. A total of 21 stiffened models are generated and analyzed using the well-known finite element program ABAQUS. In this study, the buckling and post-buckling behaviour of stiffened pipes are investigated by carrying out linear and...
A composite rigid body algorithm for modeling and simulation of an underwater vehicle equipped with manipulator arms
, Article Journal of Offshore Mechanics and Arctic Engineering ; Volume 128, Issue 2 , 2006 , Pages 119-132 ; 08927219 (ISSN) ; Omidi, O ; Meghdari, A ; Vossoughi, G ; Sharif University of Technology
2006
Abstract
In this paper modeling and simulation of an underwater vehicle equipped with manipulator arms, using a composite rigid body algorithm, will be discussed. Because of the increasing need for unmanned underwater vehicles (UUVs) in oil and gas projects in the Persian Gulf for doing operations such as inspection of offshore jackets, subsea pipelines, and submarine cables, and also pre-installation survey and post-laid survey of submarine pipelines and cables, design and construction of "SROV" was developed in Sharif University of Technology, and at the design stage behavior of the underwater vehicles was studied. In this paper, an efficient dynamic simulation algorithm is developed for an UUV...