The 2nd Higher Harmonic Control Aeroacoustic Rotor Test (HART Ⅱ) was a joint project of five research organization spanning four countries:1. DLR - The German Aerospace Center; 2.ONERA - The French Aerospace Lab; 3.DNW - The German-Dutch Wind Tunnels; 5. The US National Aeronautics and Space Administration (NASA); and 6. The US Army's Combat Capabilities Development Command (DEVCOM) Aviation Missile Center (AvMC) Technology Development Directorate (then known as the Aeroflightdynamics Directorate, or AFDD). An MBB (now Airbus) Bo 105 Mach-scaled model rotor was tested in 2001 to investigate the physics of higher-harmonic control (HHC) on rotor aeromechanics and its acoustics. A subset of the HART Ⅱ data was released to the international community in 2005 with the opening of the HART Ⅱ International Workshop. Semi-annual meetings were held until 2012 in conjunction with the Vertical Flight Society's Annual Forum and the European Rotorcraft Forum (ERF). Its purpose was to provide the most comprehensive experimental database for code validation and technical interchange of expertise in analysis and modeling. The available data comprise rotor blade definition, its properties and rotor trim, blade motion and surface pressure measurements, blade tip vortex trajectories and particle image velocimetry (PIV) maps of the vortex velocity fields, as well as virtual PIV data, microphone measurements and noise carpet plots.
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