Acoustic testing of the bell 699 rotor on the tiltrotor test rig (TTR) in the national full-scale aerodynamics complex 40-by 80-foot wind tunnel in conversion and airplane configuration
Citation
Shelts, Kelly; Schatzman, Natasha L. 2020. Acoustic testing of the bell 699 rotor on the tiltrotor test rig (TTR) in the national full-scale aerodynamics complex 40-by 80-foot wind tunnel in conversion and airplane configuration. Aeromechanics for Advanced Vertical Flight Technical Meeting 2020, Held at Transformative Vertical Flight 2020, pp 21-35
Abstract
The Tiltrotor Test Rig (TTR) provides new proprotor testing capabilities to the National Aeronautics and Space Administration (NASA) and the Department of Defense (DoD). A checkout test for the TTR with the 699 proprotor was performed in the National Full-Scale Aerodynamics Complex (NFAC) 40-by 80-Foot Wind Tunnel from 2017 to 2018. Four microphones were placed around the rotor to capture acoustic data. Revolution based acoustic data processing techniques are evaluated for appropriateness in both helicopter and airplane configurations. This paper presents the acoustic data acquired for the rotor in conversion and airplane configuration.
Description
© 2020 by the Vertical Flight Society. Work of the US Gov. Public Use Permitted. This is a work of the U.S.
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