Control of Enclosed Sound Fields using Shunted Piezoelectric Circuits

摘要

In this article, the modeling and control of enclosed sound fields using shunted piezoelectric circuit is investigated. A spherical wave, which is generated by a noise source located in the near field, is transmitted into a rectangular enclosure through a flexible panel. Piezoelectric patches, which are bonded symmetrically to the top and bottom surfaces of the panel, are either shunted through electric shunt circuits, and hence acting as energy dissipaters, or used as sensors for vibration measurements. Microphone sensors are used inside and outside the enclosure for acoustic pressure measurements. The shunted circuits are developed such that the acoustical effects of two dominant vibration modes can be attenuated, and this feature makes it appealing for noise control schemes for multiple tones. The numerical predictions of the noise attenuation levels are found to be in good agreement with the corresponding experimental measurements.