Phased microphone array measurements of a bombardier aircraft scaled model

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Proceedings title19th AIAA/CEAS Aeroacoustics Conference
Conference19th AIAA/CEAS Aeroacoustics Conference, 27 May 2013 through 29 May 2013, Berlin
SubjectAerodynamic wind tunnel model; Aircraft manufacturers; Bombardier aerospaces; Calibration procedure; Collaborative research; Conventional beamforming; National Research Council; Post-processing procedure; Aeroacoustics; Aerodynamics; Aircraft models; Calibration; Microphones; Acoustic noise
AbstractAerodynamic testing of high fidelity models is a standard practice for aircraft manufacturers. With the development of phased microphone array technology, aeroacoustics can become an integral part of the design process of an airplane. In 2012, the National Research Council Canada and Bombardier Aerospace carried out a collaborative research program focusing on measuring the sound generated by a high-fidelity aerodynamic wind tunnel model. The noise of various configurations was measured at combinations of three wind speeds and three microphone array polar orientations above the model. Several calibration reference noise waveforms were explored to determine the most effective in a highly reverberant hard-walled test section. The calibration data analysis showed that meaningful beamform maps above 30kHz could be generated when a pulsed sine wave was applied as the reference noise signal in the calibration process. For the model configurations tested, slat noise dominated the sound maps processed using either conventional beamforming or CLEAN-PSF. The wing flap edge noise as well as the contributions from the main gear were also discernible. For each configuration, one data point was taken while the microphone array was rotating instead of stationary. The computationally intense post-processing procedure for these data provided a detailed map of the sources due to reduced spatial aliasing. The sound levels measured with the rotating array were at a slightly lower magnitude owing to the averaging of the source over its full directivity pattern. Future work includes implementing a calibration procedure for the rotating array and improving the signal-to-noise ratio of the signals so that shorter microphone time histories can be used to extract directivity information from the datasets of the rotating array.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21269855
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Record identifier73e9c373-6af2-442f-9fa6-34af9a3ef0a2
Record created2013-12-13
Record modified2016-05-09
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