Abstract
In this paper, an iterative method based on the transfer matrix approach is described for evaluating the sound speed and attenuation constant of air in a standing wave tube. The procedure is based on transfer matrix, the four‐microphone method for measuring the transmission loss of acoustical materials. In the latter procedure, a sample is placed between two pairs of microphones, where the sample is exposed to an incident plane wave field. In the present case, the air inside the standing wave tube is treated as the sampled material. Since the knowledge of the dispersion characteristics of plane waves within the tube is required to perform this measurement, an iterative method must be applied at the postprocessing step to estimate the complex wave numbers in the sample section. The result from the experiments showed that the air temperature within the tube has a significant impact on the results. The measured results were found to be in good agreement with the Temkin formula for attenuation in tubes. In ad...
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