ASA 127th Meeting M.I.T. 1994 June 6-10

5aNS9. Active control of noise radiated into an enclosure.

Lily M. Wang

Vasundara V. Varadan

Vijay K. Varadan

Res. Ctr. for the Eng. of Electron. and Acoust. Mater., Graduate Program in Acoust. and Dept. of Eng. Sci. and Mech., Penn State Univ., University Park, PA 16802

Control of noise radiated into an enclosure from an external source is of interest in several applications. The noise is transmitted into the enclosure by the induced structural vibrations of the walls of the enclosure. An active control experiment using discrete piezoelectric sensors and actuators is proposed to sense and control the structure-borne sound. A sound level meter and error microphone are used to measure the acoustic field intensity inside the enclosure with and without control. The results of this experiment will define the feasibility of applying active control methods to larger enclosures such as office partitions, passenger compartments of vehicles, control rooms in factory floors, hospital rooms, and apartments in crowded urban areas.