Bayesian estimations of dissipation, sound speed, and microphone positions in impedance tubes | Zendy

Ziqi Chen | Zendy; Ning Xiang | Zendy; Cameron J. Fackler | Zendy

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Bayesian estimations of dissipation, sound speed, and microphone positions in impedance tubes

Author(s) -

Ziqi Chen,

Ning Xiang,

Cameron J. Fackler

Publication year - 2022

Publication title -

jasa express letters

Language(s) - English

Resource type - Journals

ISSN - 2691-1191

DOI - 10.1121/10.0012993

Subject(s) - acoustics , microphone , dissipation , electrical impedance , tube (container) , acoustic impedance , reflection coefficient , reflection (computer programming) , characteristic impedance , noise reduction coefficient , materials science , mechanics , physics , optics , computer science , sound pressure , ultrasonic sensor , porosity , composite material , thermodynamics , quantum mechanics , programming language

Sound speed, microphone positions, and tube wall dissipation are critical parameters for absorption and impedance measurements using the transfer-function method in an impedance tube. This work applies a Bayesian method, based on a reflection coefficient model of an air layer and a boundary layer dissipation model, to estimate the values of these parameters for tube measurements. This estimation is based on experimental measurements obtained in the empty impedance tube with a rigid termination. Analysis results demonstrate that this method is able to accurately estimate the dissipation coefficient, the sound speed, and the microphone positions for highly accurate tube measurements.

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