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40r Mic acoustic amplitudes acoustic data acoustic far field 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 CMCM CMCM CMCM CMCM data were acquired DFVLR downstream exhibit exploratory far-field filter Helicopter Rotor high-pass filter hover tip Mach impulsive content Langley Research Center lower speed m/sec maximum BVI measurement locations metric Mic 9 microphone array microphone locations NASA nominal on-line oo o oo open test section peak-to-peak plane reference retreating side rotor blade Rotor Blade-Vortex Interaction rotor hub rotor test stand rotor thrust scale 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