@Article{NMTMA-12-942,
author = {Jitenjaya Pradhan and Yogesh G. Bhumkar},
title = {Assessment of Noise Attenuation by Thin Reflecting Barriers Using Dispersion Relation Preserving Scheme},
journal = {Numerical Mathematics: Theory, Methods and Applications},
year = {2019},
volume = {12},
number = {3},
pages = {942--968},
abstract = {<p style="text-align: justify;">Here, reduction in acoustic noise due to insertion of thin reflecting barriers
has been estimated. Accurate simulations have been performed using numerical methods with a near spectral resolving ability, neutral stability and the physical dispersion
relation preserving ($DRP$) nature. Use of high accuracy schemes makes present approach useful in analysis of an acoustic field consisting of acoustic waves with a large
frequency band. Present investigation has been carried out for eight geometrically different acoustic barriers and for nine discrete frequencies in the one-third octave band
starting from 250 $Hz$ to 1600 $Hz$. Use of high accuracy $DRP$ scheme allows one to
compute the complex acoustic field by accurately capturing reflection, diffraction and
interference of acoustic waves. Comparison of numerically obtained sound pressure
level ($SPL$) distributions at different heights with the available experimental results in
the literature shows a good match for the case of $I$-shaped barrier. In order to quantify
effects of acoustic source frequencies over a large band, we have extended our analysis
for a frequency range of 100 $Hz$ to 5000 $Hz$ for the case of $I$-shaped barrier. Present
analysis shows that the thick $T$-shaped barrier and grooved barrier work efficiently in
the low and mid frequency range while in the higher frequency range all the barriers are
equally effective due to minimal diffraction.</p>},
issn = {2079-7338},
doi = {https://doi.org/10.4208/nmtma.OA-2018-0095},
url = {http://global-sci.org/intro/article_detail/nmtma/13138.html}
}