A note on the fluid damping of an elastic cylinder in a cross-flow

✍ Scribed by H.J Zhang; Y Zhou; R.M.C So; M.P Mignolet; Z.J Wang

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 130 KB
• Volume: 17
• Category: Article
• ISSN: 0889-9746
• DOI: 10.1016/s0889-9746(02)00137-8

✦ Synopsis

This note reports an experimental study of the fluid damping of a long slender cylinder, fixed at both ends (no rotation and displacement), in a cross air-flow. The structural dynamic strain was measured in the lift direction over a range of reduced velocity U r using a fibre-optic Bragg grating sensor. An auto-regressive moving average technique was used to deduce the effective damping ratios (including structural and fluid damping) from the strain data. The modal damping ratios corresponding to the first-, second-and third-mode vibrations over a range of U r from 3 to 45 have been characterized and discussed. The results show that the value of fluid damping varied significantly at resonance when the vortex-shedding frequency coincides with one of the natural frequencies of the combined fluid-structure system.