Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies
Nowadays, micro-perforated absorbers are one of the structures that are widely used nowadays. The sound absorption mechanism is performed by viscous energy losses in the cavities on the plate. This paper examined the effect of the surface shape on the micro perforated absorber performance at low fre...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Tehran University of Medical Sciences
2019-10-01
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| Series: | International Journal of Occupational Hygiene |
| Subjects: | |
| Online Access: | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/418 |
| _version_ | 1818918110356307968 |
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| author | Mohammad Reza Monazzam Zahra Hashemi |
| author_facet | Mohammad Reza Monazzam Zahra Hashemi |
| author_sort | Mohammad Reza Monazzam |
| collection | DOAJ |
| description | Nowadays, micro-perforated absorbers are one of the structures that are widely used nowadays. The sound absorption mechanism is performed by viscous energy losses in the cavities on the plate. This paper examined the effect of the surface shape on the micro perforated absorber performance at low frequencies (less than 500 Hz). The three-dimensional finite element method was used to predict the absorption coefficient of this group of adsorbents. Also, the results obtained from the shaped absorbers were compared with the flat micro perforated absorbers. After validating the numerical results, six different designs were defined as the surface shape of the micro perforated plates in the COMSOL Multiphysics, Ver. 5.3a software. The results reflected the fact that the factor of the surface shape can be used as a contributing factor in some frequencies. In general, the dented or concave shapes provide better outcomes than other flat designs and shapes and the convex or outward shapes bring the weakest results. |
| first_indexed | 2024-12-20T00:44:45Z |
| format | Article |
| id | doaj.art-e38e6ac2c8084ccb9ce466f9853d6e17 |
| institution | Directory Open Access Journal |
| issn | 2008-5109 2008-5435 |
| language | English |
| last_indexed | 2024-12-20T00:44:45Z |
| publishDate | 2019-10-01 |
| publisher | Tehran University of Medical Sciences |
| record_format | Article |
| series | International Journal of Occupational Hygiene |
| spelling | doaj.art-e38e6ac2c8084ccb9ce466f9853d6e172022-12-21T19:59:26ZengTehran University of Medical SciencesInternational Journal of Occupational Hygiene2008-51092008-54352019-10-01113Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low FrequenciesMohammad Reza Monazzam0Zahra Hashemi1School of Public Health and Center for Air Pollution Research (CAPR), Institute for Environmental Research (IER), Tehran University of Medical Sciences, Tehran, IranBehbahan Faculty of Medical Sciences, Behbahan, IranNowadays, micro-perforated absorbers are one of the structures that are widely used nowadays. The sound absorption mechanism is performed by viscous energy losses in the cavities on the plate. This paper examined the effect of the surface shape on the micro perforated absorber performance at low frequencies (less than 500 Hz). The three-dimensional finite element method was used to predict the absorption coefficient of this group of adsorbents. Also, the results obtained from the shaped absorbers were compared with the flat micro perforated absorbers. After validating the numerical results, six different designs were defined as the surface shape of the micro perforated plates in the COMSOL Multiphysics, Ver. 5.3a software. The results reflected the fact that the factor of the surface shape can be used as a contributing factor in some frequencies. In general, the dented or concave shapes provide better outcomes than other flat designs and shapes and the convex or outward shapes bring the weakest results.https://ijoh.tums.ac.ir/index.php/ijoh/article/view/418Micro Perforated Absorberssurface shapesLow FrequencyAbsorption Coefficient |
| spellingShingle | Mohammad Reza Monazzam Zahra Hashemi Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies International Journal of Occupational Hygiene Micro Perforated Absorbers surface shapes Low Frequency Absorption Coefficient |
| title | Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies |
| title_full | Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies |
| title_fullStr | Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies |
| title_full_unstemmed | Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies |
| title_short | Investigating the Effect of Shape on Acoustic Performance of Micro Perforated Absorber at Low Frequencies |
| title_sort | investigating the effect of shape on acoustic performance of micro perforated absorber at low frequencies |
| topic | Micro Perforated Absorbers surface shapes Low Frequency Absorption Coefficient |
| url | https://ijoh.tums.ac.ir/index.php/ijoh/article/view/418 |
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