Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts
The control of noise propagating along ventilation system ducts has always been an important issue in the building and vehicle sectors. This problem is generally tackled by selecting noise-reducing components with a suitable transmission loss, possibly verifying their effectiveness at a later time....
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-04-01
|
| Series: | Designs |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2411-9660/6/2/37 |
| _version_ | 1797436174484111360 |
|---|---|
| author | Edoardo Alessio Piana Ulf Erik Carlsson Adriano Maria Lezzi Diego Paderno Susann Boij |
| author_facet | Edoardo Alessio Piana Ulf Erik Carlsson Adriano Maria Lezzi Diego Paderno Susann Boij |
| author_sort | Edoardo Alessio Piana |
| collection | DOAJ |
| description | The control of noise propagating along ventilation system ducts has always been an important issue in the building and vehicle sectors. This problem is generally tackled by selecting noise-reducing components with a suitable transmission loss, possibly verifying their effectiveness at a later time. The aim of this article is to characterize the nature of the problem and propose a design approach focusing directly on the perceived effect, that is, on the sound pressure level downstream of the outlet. Because the nature of the noise emission depends on various generation mechanisms, different methods can be applied. Usually, it is more difficult to realize good attenuations at low frequencies because of the limits of sound absorbing materials in such frequency range. For this reason, the ability of reactive components to attenuate the noise below the cut-on frequency will be investigated. This goal is reached by applying the transfer matrix approach to a duct system, with the implementation of the transfer matrices of each single element, and then assembling a system capable of acoustically describing the source and the duct structure. The coupling between the duct system with source and receiver impedances allows one to predict the sound pressure level at a given distance from the outlet. The proposed methodology is implemented in a user-friendly calculation tool with possible academic and professional application. Predictive capability, usability, and intuitiveness of the proposed design procedure are validated against experimental results by real potential users, who express positive feedback. |
| first_indexed | 2024-03-09T10:58:47Z |
| format | Article |
| id | doaj.art-febe7f0e855343c9b8c3d35158ee0795 |
| institution | Directory Open Access Journal |
| issn | 2411-9660 |
| language | English |
| last_indexed | 2024-03-09T10:58:47Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Designs |
| spelling | doaj.art-febe7f0e855343c9b8c3d35158ee07952023-12-01T01:28:46ZengMDPI AGDesigns2411-96602022-04-01623710.3390/designs6020037Silencer Design for the Control of Low Frequency Noise in Ventilation DuctsEdoardo Alessio Piana0Ulf Erik Carlsson1Adriano Maria Lezzi2Diego Paderno3Susann Boij4Applied Acoustics Laboratory, University of Brescia, Via Branze 38, 25123 Brescia, ItalyMWL, Department of Engineering Mechanics, KTH—Royal Institute of Technology, Teknikringen 8, SE-100 44 Stockholm, SwedenDepartment of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, ItalyDepartment of Mechanical and Industrial Engineering, University of Brescia, Via Branze 38, 25123 Brescia, ItalyMWL, Department of Engineering Mechanics, KTH—Royal Institute of Technology, Teknikringen 8, SE-100 44 Stockholm, SwedenThe control of noise propagating along ventilation system ducts has always been an important issue in the building and vehicle sectors. This problem is generally tackled by selecting noise-reducing components with a suitable transmission loss, possibly verifying their effectiveness at a later time. The aim of this article is to characterize the nature of the problem and propose a design approach focusing directly on the perceived effect, that is, on the sound pressure level downstream of the outlet. Because the nature of the noise emission depends on various generation mechanisms, different methods can be applied. Usually, it is more difficult to realize good attenuations at low frequencies because of the limits of sound absorbing materials in such frequency range. For this reason, the ability of reactive components to attenuate the noise below the cut-on frequency will be investigated. This goal is reached by applying the transfer matrix approach to a duct system, with the implementation of the transfer matrices of each single element, and then assembling a system capable of acoustically describing the source and the duct structure. The coupling between the duct system with source and receiver impedances allows one to predict the sound pressure level at a given distance from the outlet. The proposed methodology is implemented in a user-friendly calculation tool with possible academic and professional application. Predictive capability, usability, and intuitiveness of the proposed design procedure are validated against experimental results by real potential users, who express positive feedback.https://www.mdpi.com/2411-9660/6/2/37low frequency noisetransfer matrix methodduct acousticsreactive silencersventilation noise |
| spellingShingle | Edoardo Alessio Piana Ulf Erik Carlsson Adriano Maria Lezzi Diego Paderno Susann Boij Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts Designs low frequency noise transfer matrix method duct acoustics reactive silencers ventilation noise |
| title | Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts |
| title_full | Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts |
| title_fullStr | Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts |
| title_full_unstemmed | Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts |
| title_short | Silencer Design for the Control of Low Frequency Noise in Ventilation Ducts |
| title_sort | silencer design for the control of low frequency noise in ventilation ducts |
| topic | low frequency noise transfer matrix method duct acoustics reactive silencers ventilation noise |
| url | https://www.mdpi.com/2411-9660/6/2/37 |
| work_keys_str_mv | AT edoardoalessiopiana silencerdesignforthecontroloflowfrequencynoiseinventilationducts AT ulferikcarlsson silencerdesignforthecontroloflowfrequencynoiseinventilationducts AT adrianomarialezzi silencerdesignforthecontroloflowfrequencynoiseinventilationducts AT diegopaderno silencerdesignforthecontroloflowfrequencynoiseinventilationducts AT susannboij silencerdesignforthecontroloflowfrequencynoiseinventilationducts |