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Active control of a circular plate to reduce transient noise transmission

โœ Scribed by J.L. van Niekerk; B.H. Tongue; A.K. Packard

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
727 KB
Volume
183
Category
Article
ISSN
0022-460X

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โœฆ Synopsis

An active control approach that reduces transient noise transmission through a plate in a circular duct is presented. Two circular pieces of piezoceramic material are used as actuators to induce a moment in the plate. A model for this configuration is developed and then used in an H2 optimal control procedure to design a dynamic feedforward/feedback controller. In the experiment the forward travelling wave is estimated from the measurements of two microphones. This information is used as the feedforward signal, while the velocity of the center of the plate is measured with a laser vibrometer and used as the feedback signal. The discretized controller is implemented on a digital signal processor (DSP). A transient pressure pulse is used to excite the plate, and reductions of up to 15 dB are observed at a microphone placed downstream of the plate when the controller is active.

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