A Transfer Matrix Method for Estimating the Dispersion and Attenuation of Plane Waves in a Standing Wave Tube
نویسندگان
چکیده
In this paper, an iterative method based on the transfer matrix approach was developed for evaluating sound speed and attenuation constant of air. If the air inside the impedance tube is treated as the tested material, such as porous materials, the transfer matrix approach can be easily used to identify the air’s acoustic properties. Then an iterative method can be applied in the post-processing to estimate the complex air wave numbers accurately. The result from the experiments showed that the air temperature inside the tube was a little higher than the ambient temperature and that the corrected Temkin formula gave the best theoretical prediction of sound speed in the tube. In addition, the approach may be extended to the accurate measurement of viscosity and sound velocity of liquids and gases.
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