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The implementation of modal estimation for structural acoustics control

Piezoceramic controllers modeled by four-point moments are employed to reduce the sound power transmitted through the clamped plate. The state of the plate is obtained from the accelerometers through the modal filter. The relationship between the structural vibration and the transmitted sound power is then derived to determine the sound potential which is used as the cost function. This completes the design of the state-feedback controller. The dynamics of the plate are altered due to state feedback, as expected. The experiment was conducted in an anechoic chamber. The theoretical and experimental results show that the sound power transmitted in the low-frequency range can be reduced effectively.