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Offshore Technology

Design of a Test Rig for Vibration Control of Oil Platforms Using Magneto-Rheological Dampers

[+] Author and Article Information
Mansour Karkoub

Department of Mechanical Engineering,  Texas A&M University at Qatar, P. O. Box 23874 Doha, Qatar

Lisa Ann Lamont1

Department of Electrical Engineering,  The Petroleum Institute, P. O. Box 2533 Abu Dhabi, UAEllamont@pi.ac.ae

Lana El Chaar

Department of Electrical Engineering,  The Petroleum Institute, P. O. Box 2533 Abu Dhabi, UAE

1

Corresponding author.

J. Offshore Mech. Arct. Eng 133(4), 041302 (Apr 08, 2011) (10 pages) doi:10.1115/1.4003358 History: Received March 29, 2009; Revised June 30, 2010; Published April 08, 2011; Online April 08, 2011

Offshore steel structures are widely used around the world, e.g., in Gulf of Mexico, the Middle East, and the North Sea. These structures are costly to build, and any damage to them could be catastrophic financially and environmentally. There are many factors that could possibly affect the health of these steel structures, particularly hydrodynamic forces. These forces cause the structure to vibrate and in the long run could lead to fatigue failure. Therefore, measures have to be taken in order to prevent these structures from failing. Magneto-rheological (MR) dampers are proven as a feasible alternative to reducing structural vibrations. An experimental setup is built in our laboratory to improve the dynamic modeling of steel jacketlike structures and study the effectiveness of MR dampers in decreasing the hydrodynamically induced vibrations. The structure is analyzed theoretically and experimentally, and the results are presented here.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Spar offshore production systems, courtesy of Chevron (32)

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Figure 2

Experimental setup of the offshore

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Figure 3

3D-schematic diagram of the steel jacket platform and the FEM node numbering scheme

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Figure 4

Experimental wave generator

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Figure 5

Wave characteristic measuring system

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Figure 6

MR damper and accelerometer placement

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Figure 7

Schematic diagram of the MR damper

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Figure 8

Graph of the voltage algorithm for the MR damper controller

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Figure 9

Block diagram of the closed-loop steel jacket system

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Figure 10

Open-loop response of the MR damper using a pulse input for voltage control and sinusoidal input for displacement

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Figure 11

Open-loop displacement at node 16

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Figure 12

Closed-loop response of the steel jacket system at node 16

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Figure 13

Open-loop and closed-loop responses of the steel jacket system at node 16

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Figure 14

Power spectrum of the acceleration signal from node 16 of the steel jacket structure

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Figure 16

Experimental acceleration at node 16

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Figure 15

Experimental acceleration at node 16

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