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International Journal of Occupational Hygiene، جلد ۵، شماره ۴، صفحات ۱۴۴-۱۵۱
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عنوان انگلیسی Acoustic Evaluation of Single Gutters with Different Design Configurations alongside Highways
چکیده انگلیسی مقاله Environmental noise pollution is among the most urban problems which can be caused due to real sources like traffic, train and virtual sources provided by rigid surfaces. One of the urban structures in which can perform as a virtual noise source are the installed gutters alongside highways. These structures are mostly used to pass the wastewater or the rainfall. In this research, the acoustical performance of a gutter when the receivers are located on the top surface of gutter or in its shadow zone is investigated. To compute the acoustical efficiency of gutters, a 2D Boundary Element Method (BEM) is used. Investigation on the top surface of a simple gutter has shown that the total sound pressure has been changed and results in some disturbance. Various shapes have been studied to decline such disturbance. It was found that sound pressure of the model with curved basement was scattered steadier and the sound pressure for gutter models with wide basement was lower than the ones with narrow basement. Efficiency of some designed models was also compared in the shadow zone. Increase in depth and wide of gutter models either on the top or bottom surface has enhanced the performance of simple reference model. Considering the insertion loss computations, the amount of overall improvement in models with higher depths was more than widen models because of shifting effective performance toward lower frequencies.
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نویسندگان مقاله سمانه مومن bellahfard | samaneh momen bellahfard
department of environmental science, graduate school of the environment and energy, science and research branch, islamic azad university, tehran, iran.

سازمان اصلی تایید شده: دانشگاه آزاد اسلامی علوم و تحقیقات (Islamic azad university science and research branch)

محمدرضا منظم | mohammadreza monazzam
department of occupational hygiene, school of public health and center for air pollution research capr , institute for environmental research ier , tehran university of medical sciences, tehran, iran.

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

نشانی اینترنتی http://ijoh.tums.ac.ir/index.php/ijoh/article/view/81
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زبان مقاله منتشر شده en
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