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.
Original language | English |
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Title of host publication | 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 |
Pages | 4678-4687 |
Number of pages | 10 |
Volume | 6 |
Publication status | Published - 1 Dec 2010 |
Event | 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 - Lisbon, Portugal Duration: 13 Jun 2010 → 16 Jun 2010 |
Conference
Conference | 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 |
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Country/Territory | Portugal |
City | Lisbon |
Period | 13/06/10 → 16/06/10 |
Keywords
- Acoustic resonance
- Closed-loop control
- Downsampling
- Flow-induced
- Open-loop control
- Surface perturbation
- Vortex
ASJC Scopus subject areas
- Acoustics and Ultrasonics