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Acoustic Flight Test of the Joby Aviation Advanced Air Mobility Prototype VehicleAn extensive acoustic flight test was performed on the Joby Aviation pre-production all-electric vertical takeoff and landing prototype. With the design intent of carrying a pilot and four passengers a maximum range of 150 miles, this vehicle utilizes distributed propulsion and vectored thrust via six tilting propellers. As part of the Advanced Air Mobility (AAM) National Campaign, this is the first full-scale AAM aircraft tested by NASA over representative conditions for all phases of a typical mission profile. A 58- channel distributed microphone array was used to acquire acoustic measurements on more than 100 test points (31 unique conditions). The measurements were postprocessed with synchronously sampled vehicle position and state data to form ground noise contours of departures and approaches at various flight path angles and accelerations. Comparing ground areas of 75 dBA isolines, approaches consistently exhibit higher noise levels rela- tive to departures. Directivity maps were generated for constant airspeed level flyovers. Examples comparing the differences in a semi-thrust borne and full wing-borne mode are given, with full wing-borne mode representing the quietest phase of the flight envelope tested. Measurements for hover in and out of ground effect are given and found to have 2 to 5 dB variation over a single run, and more significant variation between back-to-back runs. Finally, initial analysis of acoustic symmetry about the longitudinal vehicle axis and repeatability over several test days are presented.
Document ID
20220006729
Document Type
Conference Paper
Authors
Kyle A Pascioni
(Langley Research Center Hampton, Virginia, United States)
Michael E Watts
(Analytical Mechanics Associates (United States) Hampton, Virginia, United States)
Mary L Houston
(Analytical Mechanics Associates (United States) Hampton, Virginia, United States)
Andrew H Lind
(Langley Research Center Hampton, Virginia, United States)
James H Stephenson
(United States Department of the Army Arlington, Virginia, United States)
Jeremy J Bain
(Joby Aviation )
Date Acquired
May 2, 2022
Subject Category
Acoustics
Meeting Information
Meeting: 28th AIAA/CEAS Aeroacoustics Conference
Location: Southampton
Country: GB
Start Date: June 14, 2022
End Date: June 17, 2022
Sponsors: Council of European Aerospace Societies, American Institute of Aeronautics and Astronautics
Funding Number(s)
WBS: 664817.02.07.05.01.01
CONTRACT_GRANT: 80LARC17C0003
Distribution Limits
Public
Copyright
Portions of document may include copyright protected material.
Technical Review
NASA Peer Committee
Keywords
Acoustics
Urban Air Mobility
Advanced Air Mobility
Flight Test
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