A new analytical model is developed for the reduction of noise inside a cavity using distributed piezoelectric actuators. A modal coupling method is used to establish the governing equations of motion of the fully coupled acoustics-structure-piezoelectric patch system. Two performance functions relating “global” and “local” optimal control of sound pressure levels (SPL) respectively are applied to obtain the control laws. The discussions on associated control mechanism show that both the mechanisms of modal amplitude suppression and modal rearrangement may sometimes coexist in the implementation of optimal noise control.

Issue Section:
Technical Papers
Keywords:
piezoelectric actuators, noise abatement, optimal control
Topics:
Acoustics, Actuators, Cavities, Noise (Sound), Noise control, Piezoelectric actuators, Sound pressure, Sensors, Optimal control, Optimization
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