The vortex-induced vibration response of long cables subjected to vertically sheared flow was investigated in two field experiments. In a typical experiment, a weight was hung over the side of the research vessel by a cable that was instrumented with accelerometers. A typical experiment measured the acceleration response of the cable, the current profile, the tension, and angle of inclination at the top of the cable. Total drag force was computed from the tension and angle measurements. Two braided Kevlar cables were tested at various lengths from 100 to 9,050 ft. As a result of these experiments, several important conclusions can be drawn: (i) the wave propagation along the length of the cable was damped, and therefore, under most conditions the cable behaved like an infinite string; (ii) response spectra were quite broad-band, with center frequencies determined by the flow speed in the region of the accelerometer; (iii) single mode lock-in was not observed for long cables in the sheared current profile; (iv) the average drag coefficient of long cables subjected to sheared flow was considerably lower than observed on short cables in uniform flows; (v) the r.m.s. response was higher in regions of higher current speed. A new dimensionless parameter is proposed that incorporates the properties of the cable as well as the sheared flow. This parameter is useful in establishing the likelihood that lock-in may occur, as well as in estimating the number of modes likely to respond.
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March 1986
Research Papers
Vortex-Induced Vibration and Drag Coefficients of Long Cables Subjected to Sheared Flows
Y.-H. Kim,
Y.-H. Kim
Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Mass. 02139
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J. K. Vandiver,
J. K. Vandiver
Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Mass. 02139
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R. Holler
R. Holler
Naval Air Development Center, Warminster, PA
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Y.-H. Kim
Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Mass. 02139
J. K. Vandiver
Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge, Mass. 02139
R. Holler
Naval Air Development Center, Warminster, PA
J. Energy Resour. Technol. Mar 1986, 108(1): 77-83 (7 pages)
Published Online: March 1, 1986
Article history
Received:
June 28, 1984
Revised:
April 16, 1985
Online:
October 22, 2009
Citation
Kim, Y., Vandiver, J. K., and Holler, R. (March 1, 1986). "Vortex-Induced Vibration and Drag Coefficients of Long Cables Subjected to Sheared Flows." ASME. J. Energy Resour. Technol. March 1986; 108(1): 77–83. https://doi.org/10.1115/1.3231245
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