Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/34567
Title: Closed-loop control of fluid-structure interactions on a flexibly supported cylinder
Authors: Zhang, MM
Cheng, L 
Zhou, Y
Keywords: Vortex-induced vibration
Closed-loop control
PID controller
Wake
Issue Date: 2004
Publisher: Elsevier
Source: European journal of mechanics /B-fluids, 2004, v. 23, no. 1, p. 189-197 How to cite?
Journal: European journal of mechanics /B-fluids
Abstract: This work proposes a closed-loop control of vortex-induced vibrations on a flexibly supported square cylinder. One side of the cylinder was perturbed using actuators, which were controlled by a proportional-integral-derivative controller with its feedback signal provided by a hot wire placed in the near wake. The particle image velocimetry, hot wire and laser vibrometer measurements indicate that the perturbation has completely modified the fluid-structure interaction, drastically impairing the resonance between vortex shedding and vortex-induced structural vibration. Compared with an open-loop control, the closed-loop control has two advantages. Firstly, the perturbation amplitude required to suppress vortex shedding/structural vibration is reduced by about 70%. Secondly, the closed-loop control always suppresses vortex shedding/structural vibration, while an open loop may, or may not, depending on the relationship between the vortex shedding and perturbation frequencies.
URI: http://hdl.handle.net/10397/34567
ISSN: 0997-7546
DOI: 10.1016/j.euromechflu.2003.05.005
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