论文信息 - ACTIVE CONTROL OF MULTIPLE TONES IN AN ENCLOSURE

ACTIVE CONTROL OF MULTIPLE TONES IN AN ENCLOSURE

In this paper, analytical and experimental investigations into active control of multiple tones in a three-dimensional enclosure are presented. The frequency range of the disturbance is chosen to encompass one or more structural and/or enclosure resonances. Distributed piezoceramic actuators and distributed polyvinylidene fluoride (PVDF) sensors are mounted on one of the enclosure boundaries. Acoustic sensors are used inside and outside the enclosure. An analytical formulation based on a state-space model is developed for local vibration control on an enclosure boundary and/or local noise control inside the enclosure for bandlimited disturbances. The error sensor signals are minimized by using digital feedforward control schemes based on filtered-U gradient descent algorithms. Analytical predictions from the current work are found to compare well with the results obtained in our previous experimental investigations. The current efforts are relevant to sound fields such as those enclosed in rotorcraft cabins.

A. Sampath | B. Balachandran | B. Balachandran | A. Sampath

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