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Noise Control in a Duct System with Online-tuned Shunted Piezoeletric Materials


D. Niederberger

San Diego, USA, SPIE's Annual International Symposium on Smart Structures and Materials, 14-18 March.

This talk presents an application of resonant piezoelectric shunt damping to reduce sound radiated by a clamped square aluminium plate. The plate is mounted in a duct system and excited by plane waves. The sound radiation of the plate is evaluated by measuring the volume velocity and radiated sound power. Results show a significant reduction of the radiated sound power, if the resonant shunt circuit is tuned around the first natural frequency of the plate. Additionally, the performance of the online-tuned resonant shunt for varying operating conditions is compared with a not online-tuned shunt. It is shown that the online-tuned shunt keeps optimal noise reduction for varying temperature.


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