Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier
Roadside noise barrier as the noise control solution is extensively applied to reduce noise pollution. Median barrier like roadside barriers can make insertion loss at the receiver's area making a shadow zone behind the screen. However, the performance of roadside barrier can be affected by ere...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Tehran University of Medical Sciences
2011-12-01
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| Series: | International Journal of Occupational Hygiene |
| Subjects: | |
| Online Access: | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/33 |
| _version_ | 1818965463637426176 |
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| author | Mohammad Reza Monazzam Samaneh Momen Bellah Fard |
| author_facet | Mohammad Reza Monazzam Samaneh Momen Bellah Fard |
| author_sort | Mohammad Reza Monazzam |
| collection | DOAJ |
| description | Roadside noise barrier as the noise control solution is extensively applied to reduce noise pollution. Median barrier like roadside barriers can make insertion loss at the receiver's area making a shadow zone behind the screen. However, the performance of roadside barrier can be affected by erecting a median barrier. Mainly a median barrier is considered as an extra structure to decrease the cross median crashes at highways. The aim of this study was to investigate the effectiveness of some treatments such as absorbent material and diffusers on various median barriers shapes. A 2D boundary element method was used to analyze the designed median barrier effects. Application of grass on the top surface of median barriers with even cap was more effective than those median barriers that had uneven cap. Utilizing Primitive Root Diffuser (PRD) and Quadratic Residue Diffuser (QRD) on the stem surface of median barrier has high efficiency due to cancel outing multiple reflection effects between roadside barrier and median barrier by 2.2 to 2.7 dB (A), while no improvement could be seen at median barriers with QRD and PRD tops. Finally, it can be stated that the performance of most median barriers were increased using the reactive surfaces on the stem sides of the barrier, while the top surface treatment was not very effective in this kind of screens. |
| first_indexed | 2024-12-20T13:17:25Z |
| format | Article |
| id | doaj.art-d65a0b980750442a93cf80e2c626e9bc |
| institution | Directory Open Access Journal |
| issn | 2008-5109 2008-5435 |
| language | English |
| last_indexed | 2024-12-20T13:17:25Z |
| publishDate | 2011-12-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | International Journal of Occupational Hygiene |
| spelling | doaj.art-d65a0b980750442a93cf80e2c626e9bc2022-12-21T19:39:31ZengTehran University of Medical SciencesInternational Journal of Occupational Hygiene2008-51092008-54352011-12-0132Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise BarrierMohammad Reza Monazzam0Samaneh Momen Bellah Fard1Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, Tehran, IranDepartment of Environmental Science, Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran.Roadside noise barrier as the noise control solution is extensively applied to reduce noise pollution. Median barrier like roadside barriers can make insertion loss at the receiver's area making a shadow zone behind the screen. However, the performance of roadside barrier can be affected by erecting a median barrier. Mainly a median barrier is considered as an extra structure to decrease the cross median crashes at highways. The aim of this study was to investigate the effectiveness of some treatments such as absorbent material and diffusers on various median barriers shapes. A 2D boundary element method was used to analyze the designed median barrier effects. Application of grass on the top surface of median barriers with even cap was more effective than those median barriers that had uneven cap. Utilizing Primitive Root Diffuser (PRD) and Quadratic Residue Diffuser (QRD) on the stem surface of median barrier has high efficiency due to cancel outing multiple reflection effects between roadside barrier and median barrier by 2.2 to 2.7 dB (A), while no improvement could be seen at median barriers with QRD and PRD tops. Finally, it can be stated that the performance of most median barriers were increased using the reactive surfaces on the stem sides of the barrier, while the top surface treatment was not very effective in this kind of screens.https://ijoh.tums.ac.ir/index.php/ijoh/article/view/33Median barrierBoundary element methodAbsorbent materialDiffusive devices |
| spellingShingle | Mohammad Reza Monazzam Samaneh Momen Bellah Fard Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier International Journal of Occupational Hygiene Median barrier Boundary element method Absorbent material Diffusive devices |
| title | Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier |
| title_full | Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier |
| title_fullStr | Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier |
| title_full_unstemmed | Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier |
| title_short | Numerical Analysis of the Efficiency of Different Median Barrier Models in the Presence of a Plain Roadside Noise Barrier |
| title_sort | numerical analysis of the efficiency of different median barrier models in the presence of a plain roadside noise barrier |
| topic | Median barrier Boundary element method Absorbent material Diffusive devices |
| url | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/33 |
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