Turbulence suppression for an active noise control microphone placed in a flowfield

R. S. McGuinn, G. C. Lauchle, D. C. Swanson

Research output: Contribution to conferencePaperpeer-review


A method which couples a hot-wire sensor with a microphone to eliminate flow-induced pseudo noise from the microphone signal was developed. In these experiments, a microphone and a hot-wire sensor were placed in a well-defined low speed turbulent flow in a rectangular duct Controlled acoustic noise, both random and time harmonic, was superimposed on the flow noise by placing a speaker source close to the entrance of the duct. Detailed studies of the coherence between the hot-wire and microphone signals in the presence of flow and acoustic noise indicated that the proper combination of the two signals could reduce the turbulence noise contamination in the microphone signal. Subsequent simulations demonstrated that using an adaptive least-mean-square algorithm to filter the hot-wire signal before subtracting it from the microphone signal produced flow noise attenuation of 20 dB at frequencies below 100 Hz and spectra which approached those of the uncontaminated microphone signal.

Original languageEnglish (US)
StatePublished - 1996
Event2nd AIAA/CEAS Aeroacoustics Conference, 1996 - State College, United States
Duration: May 6 1996May 8 1996


Other2nd AIAA/CEAS Aeroacoustics Conference, 1996
Country/TerritoryUnited States
CityState College

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Aerospace Engineering


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