The dynamic response interaction of a vibrating offshore pipeline on a moving seabed is herein investigated where the pipeline is idealized as a beam vibrating on an elastic foundation. This problem is of relevance in offshore exploration where pipelines are laid either on or buried in the seabed. When such pipes carry oil and gas, the undulating topography of the sea floor and the internal motion of the fluid subject the entire structure to vibration due to bending forces and form the subject of our study. Our analysis revealed that in general, the seabed acts either as a damper or as a spring and in particular when we have sedimentation, the seabed geology permits the geomechanical property of the sediment cover to act only as a damper. As expected, external excitation will increase the response of these pipes for which an amplification factor has been derived. For soft beds, high transverse vibrations were dampened by increasing the internal fluid velocity whereas they became amplified for hard beds. These results are of contemporary interest in the oil/gas industry where deep sea exploration is now receiving significant attention.
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Dynamic Response Interaction of Vibrating Offshore Pipeline on Moving Seabed
Vincent O. S. Olunloyo,
Vincent O. S. Olunloyo
Department of Systems Engineering, Faculty of Engineering,
e-mail: vosolunloyo@hotmail.com
University of Lagos
, Lagos 234, Nigeria
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Charles A. Osheku,
Charles A. Osheku
Department of Mechanical Engineering, Faculty of Engineering,
University of Lagos
, Lagos 234, Nigeria
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Ayo A. Oyediran
Ayo A. Oyediran
AYT Research Corp.
, 7922 Falstaff Road, McLean, VA 22102
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Vincent O. S. Olunloyo
Department of Systems Engineering, Faculty of Engineering,
University of Lagos
, Lagos 234, Nigeriae-mail: vosolunloyo@hotmail.com
Charles A. Osheku
Department of Mechanical Engineering, Faculty of Engineering,
University of Lagos
, Lagos 234, Nigeria
Ayo A. Oyediran
AYT Research Corp.
, 7922 Falstaff Road, McLean, VA 22102J. Offshore Mech. Arct. Eng. May 2007, 129(2): 107-119 (13 pages)
Published Online: October 19, 2006
Article history
Received:
January 4, 2006
Revised:
October 19, 2006
Citation
Olunloyo, V. O. S., Osheku, C. A., and Oyediran, A. A. (October 19, 2006). "Dynamic Response Interaction of Vibrating Offshore Pipeline on Moving Seabed." ASME. J. Offshore Mech. Arct. Eng. May 2007; 129(2): 107–119. https://doi.org/10.1115/1.2426994
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