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40r Mic acoustic amplitudes acoustic data acoustic far field acoustic radiation patterns acoustic rays Acoustic Results advance ratio advancing side aeroacoustic American Helicopter Soc aTPP background noise blade pitch Boxwell BVI acoustic signals BVI directivity BVI impulsive noise BVI noise BVI source location BVI test conditions CM CM CM contour plot data presented data were acquired DFVLR downstream exhibit exploratory far-field Figure 9 filtered Helicopter Rotor high-pass filter hover tip Mach impulsive content in-flow Langley Research Center lower speed m/sec maximum BVI measurement locations metric microphone array microphone locations NASA nominal normalized on-line open test section peak-to-peak plane retreating side retreating-side BVI rotor blade Rotor Blade-Vortex Interaction rotor hub rotor test stand rotor thrust scale Schultz spherical spreading Splettstoesser streamwise test matrix thrust coefficient tion tip Mach number tip-path-plane angle traversing array traversing microphone triangulation tunnel speed upstream V/STOL Wind Tunnel Xw sweep