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An Effective Tool for Monitoring Marine Risers
Journal of Petroleum Technology, 1972This acoustic ball-joint angle and azimuth indicator has proved, in deep water and in severe weather, that it can monitor reliably and directly the structural integrity of the riser. The knowledge it provides of the ball-joint angle can give the operator the confidence to delay or avoid disconnecting the riser without fear of adverse consequences.
Mark A. Childers +2 more
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Boundary Control of flexible marine risers
IFAC Proceedings Volumes, 2008Abstract A method to design a boundary controller for global stabilization of three-dimensional nonlinear dynamics of flexible marine risers is presented. Equations of motion of the risers are first developed in a vector form. The boundary controller at the top end of the risers is then designed based on Lyapunov's direct method.
K.D. Do, J. Pan
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An Approach to VIV Design of Marine Risers
Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design, 2007This paper presents an approach to vortex-induced vibration (VIV) design of marine risers. It begins with a brief review of the issue and then proceeds to presenting the key elements needed to make VIV predictions for marine risers. Uncertainties and discrepancies between model prediction and field measurements are discussed.
Li Lee, Don W. Allen
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, 2020
A marine riser operated in a deep-water field could be substantially affected by large amounts of movement of the floating platform, which is more complicated and very challenging to analyze.
Karun Klaycham +2 more
semanticscholar +1 more source
A marine riser operated in a deep-water field could be substantially affected by large amounts of movement of the floating platform, which is more complicated and very challenging to analyze.
Karun Klaycham +2 more
semanticscholar +1 more source
Flow‐Induced Vibrations of Marine Risers
Journal of Waterway, Port, Coastal, and Ocean Engineering, 1987Experimental work is carried out to investigate the behavior of an elastically mounted circular cylinder having vibrations restricted to a plane normal to the incident flow, as influenced by the vicinity to a similar but rigid and much larger diameter body. The tests indicate that the flexible cylinder may undergo either a vortex‐resonance, a galloping,
Alireza Bokaian, Farhad Geoola
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Vortex induced loads on marine risers
Ocean Engineering, 2005Abstract The Vortex-Induced Vibration on a circular cylinder is investigated as basis for applications on dynamics of risers used in offshore oil and gas industry. The numerical solution of the two-dimensional Reynolds Averaged Navier–Stokes equations is obtained for a circular cylinder laterally supported by a spring and a damper and free to ...
J.B. Wanderley, C. Levi
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Active control of flexible marine risers
Journal of Sound and Vibration, 2009In this article, active control of flexible marine riser angle and the reduction of forced vibration under a time-varying distributed load are considered using boundary control approach. A torque actuator is introduced in the upper riser package and a boundary control law is designed to generate the required signal for riser angle control and vibration
How, B.V.E., Ge, S.S., Choo, Y.S.
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Large-scale experiments of a marine riser
OCEANS 2008, 2008The focus of this research is on the development and testing of a large-scale model riser (130 m in length) undergoing high mode vortex induced vibrations (VIV) in the ocean environment. This large scale model will provide an intermediate step between the common riser models (8-10 m in length) that have mainly been used to research VIV to date and the ...
David Murrin +4 more
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