Abstract: Abstract. High-bypass ratio ducted fans emit tonal and broadband noise in both forward and aft directions. While produced by common mechanisms, the noise radiating in each direction is typically treated as its own directional ...

Abstract: Detailed mapping of the sound field produced by a modern turbofan engine, with its multitude of overlapping noise sources, often requires a large number of microphones to properly resolve the directivity patterns of the ...

Abstract: Imaging of aeroacoustic noise sources is routinely accomplished with geometrically fixed phased arrays of microphones. Several decades of research have gone into improvement and optimization of sensor layouts, selection ...