Abstract by David Van Komen
David Van Komen
Physics and Astronomy
Tracianne Neilsen, Kent Gee
Evaluating the Effectiveness of Subarrays in Beamforming Computations
Acoustic beamforming is a powerful signal processing technique that localizes acoustic sources using an array of microphones. Conventional acoustic beamforming analyses rely on using a large number of microphones in an array to get a single acoustic sound source. Investigating the results of smaller portions of the array could lead to interesting physical insights of sound sources, as well as put into question the number of necessary microphones for large acoustic sources. To investigate this, a 71-microphone array that was used to analyze the equivalent sources of a military-grade jet engine was divided into several sub-arrays after processing the acoustic beamforming results of the full array. The results of the different subarrays were compared on a frequency-by-frequency basis to each other and to the results of the full array. Analysis of the results has led to further insight on the downstream effects of the jet noise and to a greater understanding of characteristics that create the noise. These same methods could be used in investigating other acoustic sound sources to determine the weight of different microphones on the final results of a full array.