Aerodynamic noise source detection for main landing gear based on phased microphone array technique

Landing gear noise is one of the most important parts of the aircraft's airframe noise. Due to the geometry complexity of the landing gear devices, as well as the interference effects on the flows surrounding the parts of the landing gear, the noise mechanism of the landing gear is extremely complicated. Currently, the phased microphone array is one of the most popular methods to detect the location of the acoustic source of the airframe noise. After acquiring the noise source data in a closed wind tunnel, the Beamforming are adopted to localize the exact noise source locations at different frequencies. In order to avoid the cover effect of side-lobes of the maximum noise source location, CLEAN-PSF algorithm is employed to cut out the noise source location at the main door.