RESEARCH PAPERS: Offshore Mechanics

Determination of Fluid Damping Using Random Excitation

[+] Author and Article Information
J. C. S. Yang, C. H. Marks, J. Jiang, D. Chen, A. Elahi, W-H. Tsai

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Energy Resour. Technol 107(2), 220-225 (Jun 01, 1985) (6 pages) doi:10.1115/1.3231180 History: Received July 05, 1983; Revised December 10, 1984; Online October 22, 2009


An experimental investigation has been carried out to verify the validity of the use of the random decrement technique to determine the damping coefficients for a circular cylinder oscillating in water. Data are reported for amplitudes ranging from 0.4 diameters to 0.8 diameters, for water speeds from zero to 0.192 m/s (0.63 ft/sec), and for frequencies ranging from 0.37 Hz to 1.4 Hz. Comparison with other data, which has been reported in the literature or obtained by the authors, shows that the random decrement method yields comparable damping coefficients to those obtained using the logarithmic decrement technique for the range of variables in this experiment.

Copyright © 1985 by ASME
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