Virginia Tech. Department of Mechanical EngineeringWang, Bor-TsuenFuller, Chris R.2015-05-272015-05-271992-09-01Wang, B. T., & Fuller, C. R. (1992). Near-field pressure, intensity, and wave-number distributions for active structural acoustic control of plate radiation: Theoretical analysis. Journal of the Acoustical Society of America, 92(3), 1489-1498. doi: 10.1121/1.4052770001-4966http://hdl.handle.net/10919/52699This paper presents a theoretical analysis of near-field time-averaged intensity and pressure distributions of actively controlled plate-radiated sound. A harmonic point force was considered as a noise source, and a piezoelectric element bonded to the plate was applied as control actuator. A single microphone that measures sound pressures in the radiated acoustic far field serves as an error sensor. The optimal input voltage to the piezoelectric actuator is obtained by minimizing a quadratic cost function, defined as the mean square of the error sensor signal. The influence of the location of the error microphone on near-field pressure and normal intensity was studied. Fourier transforms in the wave-number domain are also used to study the mechanisms of control. This work provides a better understanding of the behavior inherent in controlling structurally radiated sound using piezoelectric actuators. In particular, an understanding of the near-field behavior under closed loop control is inherent in the design of sensor arrays located near or on the plate surface.10 pagesapplication/pdfen-USIn CopyrightSound pressurePiezoelectric devicesAcoustic analysisAcoustic radiation pressureControl theoryArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/92/3/10.1121/1.405277https://doi.org/10.1121/1.405277