Analytical and experimental studies undertaken for controlling noise in the interior of a 3D enclosure with a flexible boundary are presented. The rigid boundaries are constructed from acrylic material, and the flexible boundary is constructed from aluminum materia. Noise generated by an external speaker is transmitted into the enclosure through the flexible boundary and active control is realized by using Lead Zirconate Titanate piezoelectric actuators bonded to the flexible boundary. Condenser microphones are used for noise measurements. For panel and cavity controller modes, analog controllers based on feedforward schemes using acoustic error signals are developed and discussed.
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