Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30420
Title: Active control of flow-induced acoustic resonance through surface perturbation
Authors: Lu, Z
Cheng, L 
Halim, D
Keywords: Acoustic resonance
Closed-loop control
Downsampling
Flow-induced
Open-loop control
Surface perturbation
Vortex
Issue Date: 2010
Source: 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010, 2010, v. 6, p. 4678-4687 How to cite?
Abstract: Flow-induced acoustic resonance inside downstream cavities was experimentally investigated. A controllable motion was imposed on the surface of an upstream vortex generator using embedded piezoceramic actuators. Experiments were conducted by using both open-loop and closed-loop control. Open-loop tests show that there was an optimum control frequency and control voltage which led to a significant reduction in the strength of the flow-induced acoustic resonance. This was directly resulted not only from an impairment of the vortex shedding strength, but also from a shift in the shedding frequency created by the control action. Due to the practical limitation of the actuators, closed-loop control based on the downsampled feedback signals was implemented and tested. A downsampling procedure for reconstructing the feedback signals was investigated. Performance of the closed-loop control was then assessed. Analyses were carried out to reveal the effects of the feedback gain and phase delay on the control performance.
Description: 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010, Lisbon, 13-16 June 2010
URI: http://hdl.handle.net/10397/30420
ISBN: 9781617823961
Appears in Collections:Conference Paper

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