%0 Journal Article
%T Development of a Time-Efficient Approach to Measure the Acoustic Impedance of  Industrial Insulating Materials
%A Etaribo Binaebi-Soroh
%A Diogo Montalvao
%J Open Journal of Applied Sciences
%P 55-67
%@ 2165-3925
%D 2019
%I Scientific Research Publishing
%R 10.4236/ojapps.2019.92006
%X This study presents a development on a time efficient approach to measure
the Acoustic Impedance of Industrial Insulating materials using an impedance
tube with single moveable microphone and a white noise generator. The standing
wave method is used to measure the acoustic properties (absorption </span></span><span style=\"font-family:Verdana;\"><span style=\"font-family:Verdana;\"><span style=\"font-family:Verdana;\">coefficient</span></span></span><span><span><span style=\"font-family:&quot;\"><span style=\"font-family:Verdana;\"> and acoustic impedance) of sound absorbing materials. In order to use a
burst of white noise instead of individual stationary sine waves, a signal
processing technique was developed. The algorithm is based on the equation of
simple harmonic motion, but uses distance as a variable, instead of time. This
innovative method allows measuring at frequency resolutions as low as 5 Hz in a
reasonably short amount of time. </span><span style=\"font-family:Verdana;\">This is an advantage,
as the classical standing wave method uses frequency resolutions of one-third
of octaves for measurements, as otherwise time would be prohibitive.
Experimental results are validated with those measured with the sine wave
generator using one-third of octave frequencies by comparing their behaviours.
%K Acoustic Impedance
%K White Noise
%K Sound
%K Absorption Coefficient
%U http://www.scirp.org/journal/PaperInformation.aspx?PaperID=90726