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The research of measuring the standard uncertainty and sound absorption coefficient for different frequency and different air gap thickness was carried out. This study helps to find out the potential use of echo wood as a sound absorption material. The effects of air gap thickness on echo wood’s sound absorption coefficient and standard uncertainty were studied. Panels were placed with different air gap thicknesses of 20 mm and 50 mm in the reverberation room. The panels with echo wood material were tested in acoustic and vibration metrology lab of the CSIR – National Physics Laboratory, New Delhi, India using the ISO 354 (2003) standard for noise absorption coefficients and standard uncertainty. The maximum sound absorption coefficients for panel using the different air gap thickness of 20 mm and 50 mm are 0.62 and 0.87 for frequency of 1600 Hz and 800 Hz, respectively. Similarly, maximum standard uncertainty for panel using different air gap thickness of 20 mm and 50 mm are 12.40 % and 11.81 % for frequency 100 Hz and 125 Hz respectively. Also the best fitting model of material for frequency has been estimated for full frequency range and then classified frequency range (i.e. Low frequency 100-500Hz, Medium Frequency 600-1200Hz and High Frequency 1500-400Hz). It is found that the sound absorption coefficient behavior is not linear for full range of frequency. Whereas in classified range of frequency, sound absorption coefficient fits nicely with the linear model. The results shows that the distribution of sound absorption coefficient of the panel using echo wood over different frequency range can be controlled using the air gap thickness. Also echo wood material applications is explored for different frequency ranges.
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