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Development of a Low-Cost Impedance Tube to Measure Acoustic Absorption and Transmission Loss of Materials

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2014 ASEE Annual Conference & Exposition


Indianapolis, Indiana

Publication Date

June 15, 2014

Start Date

June 15, 2014

End Date

June 18, 2014



Conference Session

Mechanical Division Poster Session

Tagged Division

Mechanical Engineering

Page Count


Page Numbers

24.417.1 - 24.417.15



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Paper Authors

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Satyajeet P. Deshpande Kolano and Saha Engineers, Inc.


Mohan D. Rao Tennessee Technological University

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Dr. Rao is a Professor and Chair of Mechanical Engineering at Tennessee Technological University. Previously, he was a Professor of Mechanical Engineering at Michigan Tech.

Dr. Rao is a Fellow of two major professional societies in the field—ASME and SAE. He has conducted both basic and applied research in different areas of acoustics and vibration ranging from analytical modeling of damping of materials, joints, and composite structures to experimental work involving small power tools to large scale machines (e.g. excavators, diesel engines). His research has been sponsored by NASA, NSF, ARL, State of Florida, Ford, GM, Daimler-Chrysler, Caterpillar, TRW, Johnson Controls, John Deere, NIOSH, Arctic Cat, Polaris, Xerox, and Volvo-Korea. He has over 100 publications in technical journals and conference proceedings. Also, he has advised 9 Ph.D. and 34 M.S. students. Dr. Rao has received the US Fulbright award, National Science Foundation Research Initiation Award and was honored by the NASA Marshall Space Flight Center for his work on the damping of the Hubble Space Telescope truss system. In addition, he was recognized as a United Nations Development Program expert in Noise & Vibration Control. He serves as an Associate Editor for the International Journal of Vehicle Noise and Vibration. He was recently awarded the 2011 INCE Outstanding Educator Award from the Institute of Noise Control Engineering, USA for his decades of outstanding contribution to noise control education. He is also active in Engineering Education, ABET accreditation and short course teaching in the areas of Acoustics, Noise, Vibration, Modal Analysis, Digital Signal Processing, Sound Quality, Outcome Based Engineering Education and Preparing for ABET Accreditation.

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ASEE Annual conference, 2014 DEVELOPMENT OF A LOW COST IMPEDANCE TUBE TO MEASURE ACOUSTIC ABSORPTION AND TRANSMISSION LOSS OF MATERIALS Satyajeet Deshpande 1 and Mohan D. Rao Tennessee Technological University, Cookeville, TN ABSTRACTTraditional methods of measuring sound absorption coefficient and sound transmission loss of acousticmaterials and treatments are time-consuming and expensive. To overcome this limitation, normalincidence sound absorption and transmission loss measurement technique using an impedance tube wasdeveloped. Unfortunately this equipment is equally expensive. Hence efforts are taken to develop a cost-effective impedance tube for wider use especially for educational use in emerging countries. Animpedance tube capable of measure absorption coefficient and transmission loss is designed and builtunder a budget of $1500 ideal for educational institutions. This paper discusses the design, developmentand fabrication of the low cost impedance tube along with measurement results demonstrating itsaccuracy. Using a calibrated acoustic sample, data obtained from the low-cost impedance tube werecompared with those from a standard commercial tube with encouraging results. A parametric study wasconducted showing the effects of various parameters on the accuracy of the measured results. Theseinclude tube material, tube dimensions, frequency range, source transducer, pressure-microphones,sample and microphone holder, data acquisition and reduction technique. Based on these, design optionswere generated to meet the cost and functionality targets pre-assigned. A list of suggested parts andvendors is also included for anyone to custom-build the tube for educational use.1 Currently at Kolano and Saha Engineers, Inc. Waterford, MI

Deshpande, S. P., & Rao, M. D. (2014, June), Development of a Low-Cost Impedance Tube to Measure Acoustic Absorption and Transmission Loss of Materials Paper presented at 2014 ASEE Annual Conference & Exposition, Indianapolis, Indiana. 10.18260/1-2--20308

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