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TECHNICAL PAPERS

A Comparison of Ship-Mounted and Cage-Mounted Passive Heave Compensation Systems

[+] Author and Article Information
Frederick R. Driscoll

Department of Mechanical Engineering and School of Earth and Ocean Sciences, University of Victoria, P.O. Box 3055, Victoria, British Columbia, V8W 3P6 Canadae-mail: rdriscol@uvic.ca

Meyer Nahon

Department of Mechanical Engineering, University of Victoria, P.O. Box 3055, Victoria, British Columbia, V8W 3P6 Canadae-mail: mnahon@uvic.ca

Rolf G. Lueck

Centre for Earth and Ocean Research, University of Victoria, P.O. Box 3055, Victoria, British Columbia, V8W 3P6 Canadae-mail: rlueck@uvic.ca

J. Offshore Mech. Arct. Eng 122(3), 214-221 (Jan 29, 2000) (8 pages) doi:10.1115/1.1287167 History: Received April 01, 1999; Revised January 29, 2000
Copyright © 2000 by ASME
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References

Figures

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Short time series of the cage motion (a) and tension in tether at the ship (b) for the uncompensated system, for the system with ship-mounted compensation, and for the system with cage-mounted compensation
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The rms reduction ratio for the position of the cage (a) and the tension in the tether at the ship (b) are plotted for ship-mounted (dashed lines) and cage-mounted (solid lines) compensation systems
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Spectra (a) and variance preserving spectra (b) of the acceleration of the cage at a depth of 8200 ft (2500 m). Values for the uncompensated system (solid line), the cage-mounted (dashed line), and ship-mounted (dotted line) compensated systems with δT=16.4 ft (5 m) are overlaid for comparison.
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The magnitude (a) and phase (b) of the transfer function between ship and cage motion estimated from the position records for operation at 8200 ft (2500 m). Estimates for the uncompensated system (solid line) and for the cage-mounted (dashed line) and ship-mounted (dotted line) compensation system with δT=16.4 ft (5 m) are overlaid for comparison.
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The minimum (a), maximum (b), and total payout (δmax−δmin) used (c) of the cage-mounted (dashed line) and ship-mounted (dotted line) compensation systems
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The acceleration of the cage (a) and the tension in the tether at the ship (b) for the uncompensated system (solid line), cage-compensated system (dashed line), and ship-compensated system (dotted line) for SA=21.6 ft (6.6 m)
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The acceleration of the cage (a) and the tension in the tether at the ship (b) for the uncompensated system (solid line), cage-compensated system (dashed line), and ship-compensated system (dotted line) for SA=36 ft (11 m)
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Time derivative of the acceleration of the cage (jerk) for the uncompensated system (solid line), cage-compensated system (dashed line), and the ship-compensated system (dotted line) for SA=36 ft (11 m)
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The measured (solid line) and model calculated (dashed line) position of the cage (a) and tension in tether at the ship (b). To make viewing more intuitive, the y-axis of (a) has been flipped.
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Diagrammatic representation of the finite-element lumped-mass model. The compensators (when included) are represented by the elements enclosed by the dashed lines.
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Diagrammatic representation of a cage-mounted heave compensation system at full retraction, half-extension, and full extension
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The spring force versus compensator displacement of the pneumatic passive compensator for k=0.2 (thick line) and k=0.4 (thin line)

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