Active control of multiple tones transmitted into an enclosure

The present work is a continuation of our previous efforts, in which active control of deterministic bandlimited and tonal disturbances in an enclosure with a flexible boundary has been addressed. Multiple tones in the bandwidth of 40 Hz to 1000 Hz are transmitted into the enclosure and local noise control is attempted by using a multi-input, multi- output, digital feedforward control scheme. The specific focus of the current work is on actuator grouping, and this issue is explored through numerical and experimental investigations. It is demonstrated that actuator grouping can be beneficial for controlling enclosed sound fields dominated by widely separated tones.

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