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An Acoustic Radiator with Integrated Cavity and Active Control of Surface Vibration

This paper presents a method to realize an acoustic source for low frequencies with relatively small thickness. A honeycomb plate structure that is open on one side combines the radiating surface and the major part of the air cavity. The vibration of the plate is controlled with a decentralized feedback controller. The fundamental resonance is controlled, as well as higher-order bending modes, while avoiding possible instabilities due to the fluid-structure interaction. The smooth and well defined frequency response enables robust feedforward control for further response equalization. The influence of different actuation principles on the overall system efficiency is compared.

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