Phased Array Technology Development At Virginia Tech: Application To Landing Gear Noise Source Identification

Abstract

Phased array technologies have been developed at Virginia Tech to perform
noise source identification of aerodynamic noise sources, i.e. noise due to flow. A 32 element
phased array was designed, tested an implemented. Details on the design process are shown.
Preliminary testing in the anechoic chamber and the wind tunnel was conducted to evaluate
the performance of the array in out-of-flow and in-flow condition. Results for the most
significant preliminary tests are also shown. As part of this work, noise source identification
on a 26%-scale 777 main landing gear model was performed at the Virginia Tech 6- by 6-foot
Stability Wind Tunnel. Illustrative results of the phased array performance are presented
here.