FLUID DAMPING OF AN ELASTIC CYLINDER IN A CROSS-FLOW |
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| Affiliation: | 1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Department of Mechanical and Aerospace Engineering, Arizona State University, Tempe, AZ, 85287, U.S.A.;1. IITB-Monash Research Academy, India;2. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India;3. Department of Mechanical Engineering, Monash University, 3800, Clayton, Australia;1. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John׳s, NL, Canada A1C 5S7;2. Department of Mathematics, Middle East Technical University, Ankara, Turkey;1. Department of Ocean Engineering, University of Rhode Island, Narragansett, RI 02882-1197, USA;2. China International Marine Containers (Group) LTD., Shenzhen 518067, China;3. CIMC Offshore Engineering Institute Company Limited, Yantai 264670, China;4. Shandong Provincial Key Lab of Ocean Engineering, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Damping characteristics of fluid–structure systems are difficult to measure or calculate. In the past, such data have been rather scarce. This study reports an attempt on the use of a numerical approach to derive damping ratios related to fluid–structure interactions. It is based on an autoregressive moving-average (ARMA) method, which is used to analyse the displacement time series obtained from a numerical simulation of an elastic cylinder in a uniform cross-flow. The damping ratios show a similar trend to those obtained in previous experiments. An alternative way to deduce damping ratios is to decompose the transverse force in the structural dynamics equation into a drag (or out-of-phase) and an inertia (or in-phase) component for analysis. The damping thus deduced is in fair agreement with that obtained from ARMA; however, at or near synchronization, where the natural frequency of the stationary cylinder is close to the vortex shedding frequency, there is a very substantial difference between the two results. |
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