TY - GEN
T1 - A tale of magnets and microphones
T2 - AIAA AVIATION 2020 FORUM
AU - Haxter, Stefan
AU - Ozawa, Yuta
AU - Ambo, Takumi
AU - Asai, Keisuke
AU - Nonomura, Taku
N1 - Funding Information:
The first author would like to thank the Japan Society for the Promotion of Science (JSPS) for the funding of this work by granting the JSPS Postdoctoral Fellowship (short-term).
Publisher Copyright:
© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - In acoustic wind tunnel testing, strut noise can be a great nuisance if it dominates the sound field. A magnetic model support would be a solution to this problem, as it supersedes the need for mechanical struts. A magnetic support is however likely to interfere with the microphone signals in acoustic wind tunnel testing, if the microphones are not manufactured for use in magnetic fields. In order to determine the possibilities of using microphones in a wind tunnel with a Magnetic Suspension and Balance System (MSBS), tests were made in the Basic Aerodynamic Research Tunnel at Tohoku University in Sendai, Japan. Both, tests with a static cylinder and with a levitating model were made. Microphone signals were recorded alongside Hall probe signals in order to find the influence of the magnetic environment on the pressure fluctuation signals. Several distinct frequencies were identified at which an influence of the environment was detected.
AB - In acoustic wind tunnel testing, strut noise can be a great nuisance if it dominates the sound field. A magnetic model support would be a solution to this problem, as it supersedes the need for mechanical struts. A magnetic support is however likely to interfere with the microphone signals in acoustic wind tunnel testing, if the microphones are not manufactured for use in magnetic fields. In order to determine the possibilities of using microphones in a wind tunnel with a Magnetic Suspension and Balance System (MSBS), tests were made in the Basic Aerodynamic Research Tunnel at Tohoku University in Sendai, Japan. Both, tests with a static cylinder and with a levitating model were made. Microphone signals were recorded alongside Hall probe signals in order to find the influence of the magnetic environment on the pressure fluctuation signals. Several distinct frequencies were identified at which an influence of the environment was detected.
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U2 - 10.2514/6.2020-2611
DO - 10.2514/6.2020-2611
M3 - Conference contribution
AN - SCOPUS:85092470962
SN - 9781624105982
T3 - AIAA AVIATION 2020 FORUM
BT - AIAA AVIATION 2020 FORUM
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
Y2 - 15 June 2020 through 19 June 2020
ER -