Author(s)

J. Niresh^1*, S. Neelakrishnan¹, S. Subha Rani², Siddharth Shrivastava¹

¹Department of Automobile Engineering, PSG College of Technology, Coimbatore, India.
²Department of Electronics & Communication Engineering, PSG College of Technology, Coimbatore, India.

The static flow resistivity is a fundamental parameter for measuring and classifying the sound absorption behavior of various types of materials. Several methods have been developed for measuring the static flow resistivity acoustically. Most of these methods cannot be implemented directly in the standard tubes which are widely used for measurements of sound absorption coefficients and impedance as defined in ISO 10534.2. The accuracy of the proposed method and the tube is verified through finite element analysis and the feasibility to determine the static flow resistivity is validated through experiments. It is validated that the accuracy of the proposed method is highly dependent on the position of the acoustic center of the measurement microphones and the accuracy can be enhanced by increasing the back cavity depth and/or decreasing the measurement frequency.

Static Flow Resistivity, Impedance Tube, ISO 10534.2, Sound Absorption

Niresh, J. , Neelakrishnan, S. , Rani, S. and Shrivastava, S. (2016) Analysis of Static Flow Resistivity of a Modified Impedance Tube. Circuits and Systems, 7, 2253-2261. doi: 10.4236/cs.2016.79196.