Experimental Determination of Acoustic Losses in an Acoustic Resonator Using Impedance Tube Technique


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In order to increase the potential applications of thermoacoustic engine, coiling the resonator tube is another idea to miniaturise the engine. Resonator is an essential component used to sustain the driving acoustic waves. Coiling of resonator will definitely improve the engine footprint but it may introduce losses that are not encountered by the straight resonator. A straight resonator tube is the easiest design and will have small energy losses, but it requires large space. The proposed work in coiling the resonator will certainly create more energy losses than the previous designs but the magnitude of these losses are unknown. In this paper, an impedance tube system was built to measure the sound energy losses of coiled tubes of different configurations and comparing the results with the losses in a straight tube. The impedance tube system designed for the testing consists of an upstream tube, the test section and a downstream tube. A similar investigation was also conducted for different number of sharp turns of the tubes. The two-load method was used to analyse the results by using the four-microphone impedance tube methodology. The results showed significant differences between the four configurations and the outcomes were found to be very useful in the future when designing miniature thermoacoustic engine. Nomenclature



Edited by:

Mohd Jailani Mohd Nor, Mohd Zaki Nuawi, Shahrum Abdullah, Rozli Zulkifli, Sallehuddin Mohamed Haris, Zulkifli Mohd Nopiah and Azli Arifin






D. K. W. Yang and Y. Abadlla Abakr, "Experimental Determination of Acoustic Losses in an Acoustic Resonator Using Impedance Tube Technique", Applied Mechanics and Materials, Vol. 471, pp. 361-366, 2014

Online since:

December 2013




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