TY - GEN
T1 - The development of a coaxial acoustics test system for rotor noise
AU - Zahirudin, Raja Akif Raja
AU - Greenwood, Eric
AU - Weitsman, Daniel
AU - Palacios, Jose
N1 - Funding Information:
This project was supported by the NASA Langley Research Center through a cooperative agreement with the National Institute of Aerospace (80LARC17C004 Sub-Award C20-202010-PSU). The authors would like to thank technical monitor Siena Whiteside of the Aeronautics Systems Analysis Branch and Nikolas Zawodny of the Aeroacoustics Branch of the NASA Langley Research Center for their technical contributions. The authors also thank Dr. Dennis McLaughlin for facility access and technical support.
Publisher Copyright:
© 2021 by the Vertical Flight Society. All rights reserved.
PY - 2021
Y1 - 2021
N2 - This paper describes the development of a new dual rotor test stand for the Open Jet Flow-Through Anechoic Chamber at the Penn State University. The Coaxial Acoustic Test System (CATS) can accommodate the testing of isolated, tandem, and coaxial rotor configurations operating in hover, climb, cruise, and descent flight conditions. The stand is equipped with a traversable microphone array that enables acoustic measurements to be acquired at a variety of azimuthal directivity angles. This paper highlights the design process as well as some of the encountered issues and their solutions. Sample results for two representative coaxial co-rotating rotor configurations are also presented. The first configuration consists of two vertically separated “stacked” rotors mounted on a single shaft. The rotors are mounted on separate shafts in the second configuration, so that the azimuthal position of the blades varies throughout the measurement. Close agreement was achieved in the average thrust and torque measurements for the two rotor configurations. The separated configuration had higher tonal noise levels than the stacked configuration, although broadband noise levels were similar.
AB - This paper describes the development of a new dual rotor test stand for the Open Jet Flow-Through Anechoic Chamber at the Penn State University. The Coaxial Acoustic Test System (CATS) can accommodate the testing of isolated, tandem, and coaxial rotor configurations operating in hover, climb, cruise, and descent flight conditions. The stand is equipped with a traversable microphone array that enables acoustic measurements to be acquired at a variety of azimuthal directivity angles. This paper highlights the design process as well as some of the encountered issues and their solutions. Sample results for two representative coaxial co-rotating rotor configurations are also presented. The first configuration consists of two vertically separated “stacked” rotors mounted on a single shaft. The rotors are mounted on separate shafts in the second configuration, so that the azimuthal position of the blades varies throughout the measurement. Close agreement was achieved in the average thrust and torque measurements for the two rotor configurations. The separated configuration had higher tonal noise levels than the stacked configuration, although broadband noise levels were similar.
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M3 - Conference contribution
AN - SCOPUS:85108966102
T3 - 77th Annual Vertical Flight Society Forum and Technology Display, FORUM 2021: The Future of Vertical Flight
BT - 77th Annual Vertical Flight Society Forum and Technology Display, FORUM 2021
PB - Vertical Flight Society
T2 - 77th Annual Vertical Flight Society Forum and Technology Display: The Future of Vertical Flight, FORUM 2021
Y2 - 10 May 2021 through 14 May 2021
ER -