Within a four nation research project jointly conducted by AFDD,NASA,ONERA,DLR and DNW the HHC effects on BVI noise and vibrations were investigated. The project had the objective to gain a physical understanding of the involved mechanisms and comprised theoretical as well as experimental studies. The latter ones were performed in the German Dutch Wind Tunnel (DNW) and had the overall goal to provide information about all relevant parameters. For that purpose, different measurement techniques like laser light sheet, laser doppler velocimetry as well as acoustic and non-intrusive blade deflection measurements were applied to a highly instrumented hingeless model rotor. All of these techniques were employed at different rotor conditions for different HHC settings, thus yielding a very comprehensive data base. It gives a physical insight in the mechanisms involved in BVI noise and vibration reduction by higher harmonic control and forms the basis for an improved understanding and modeling of these complex phenomena.
Initial results from the higher harmonic control aeroacoustic rotor test (HART) in the German-Dutch Wind Tunnel
Erste Ergebnisse eines aeroakustischen Rotorversuchs (HART) mit höherer harmonischer Regelung im deutsch-niederländischen Windkanal
1995
11 Seiten, 26 Bilder, 14 Quellen
Conference paper
English
Hubschrauber , Rotor (Drehflügel) , Forschungsprojekt , Schallquelle , Schwingungssystem , Betriebseigenschaft , Windkanal , Simulationsmodell , Betriebsparameter , Messverfahren , Laser-Doppler-Anemometer , akustisches Messverfahren , Vergleichsmessung , Steuerungs- und Regelungssystem , Schwingungsverhalten , Lärmminderung
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