Microphone array method for the characterization of rotating sound sources in axial fans

• Autores: Gert Herold, Ennes Serradj
• Localización: Noise Control Engineering Journal, ISSN 0736-2501, Vol. 63, Nº. 6, 2015, págs. 546-551
• Idioma: inglés
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• Resumen

  • Methods based on microphone array measurements provide a powerful tool for determining the location and magnitude of acoustic sources. For stationary sources, sophisticated algorithms working in the frequency domain can be applied. By using circularly arranged arrays and interpolating between microphone signals it is possible to treat rotating sources, as are present in fans, as being non-moving. Measurements conducted with a four-bladed fan and analyzed with the “virtual rotating array” method show that it is not only possible to identify the main noise contributors, but also to determine a full spectrum for any rotating component of interest.