Muffler structure improvement based on acoustic finite element analysis
Aiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite element analysis method and acoustic theory were adopted to numerically investigate the acoustic attenuati...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2019-06-01
|
| Series: | Journal of Low Frequency Noise, Vibration and Active Control |
| Online Access: | https://doi.org/10.1177/1461348418825200 |
| _version_ | 1818994974957502464 |
|---|---|
| author | Jun Fu Minghui Xu Zengfeng Zhang Wenjie Kang Yong He |
| author_facet | Jun Fu Minghui Xu Zengfeng Zhang Wenjie Kang Yong He |
| author_sort | Jun Fu |
| collection | DOAJ |
| description | Aiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite element analysis method and acoustic theory were adopted to numerically investigate the acoustic attenuation performance under the boundary condition of acoustic adiabatic propagation and muffler wall. It suggested that the noise cancellation effect of muffler was poor at the middle and low frequency in range of 0–3000 Hz, and the transfer loss of muffler was basically 0 dB pass frequency at 1100 Hz. According to previous single-factor study experience, the structural factors, such as the expansion ratio, insertion length of outlet perforated pipe, the distance between the diaphragm and the front part of muffler, have influences on the acoustic performance of muffler at low frequency. Thus, they were taken as the starting point to study the influence of multiple interaction factors on the muffling performance by using orthogonal design method combined with the finite element analysis method. The influence degree of different structure parameters on the acoustic performance of muffler and the optimized structure parameters were obtained. Through the analysis on the acoustic characteristic of the optimized muffler, it indicated that the transmission loss of the improved muffler had significant increase in other frequency range except the range of 650–800 Hz and 2500–2700 Hz, especially at frequency of 1100 Hz compared with the original muffler. In the range of 0–3000 Hz, the mean of transmission loss of the improved muffler was about 9.8 dB larger than that of original muffler, which indicated that better noise cancellation effect was achieved. The improved muffler also provided a certain reference for the structural improvement of similar muffler. |
| first_indexed | 2024-12-20T21:06:29Z |
| format | Article |
| id | doaj.art-bca0c5031f934f6e8feb39da60332505 |
| institution | Directory Open Access Journal |
| issn | 1461-3484 2048-4046 |
| language | English |
| last_indexed | 2024-12-20T21:06:29Z |
| publishDate | 2019-06-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Journal of Low Frequency Noise, Vibration and Active Control |
| spelling | doaj.art-bca0c5031f934f6e8feb39da603325052022-12-21T19:26:35ZengSAGE PublishingJournal of Low Frequency Noise, Vibration and Active Control1461-34842048-40462019-06-013810.1177/1461348418825200Muffler structure improvement based on acoustic finite element analysisJun FuMinghui XuZengfeng ZhangWenjie KangYong HeAiming to obtain the acoustic attenuation performance of exhaust muffler of diesel engine and the influence of main structural parameters on its acoustic attenuation characteristics, the finite element analysis method and acoustic theory were adopted to numerically investigate the acoustic attenuation performance under the boundary condition of acoustic adiabatic propagation and muffler wall. It suggested that the noise cancellation effect of muffler was poor at the middle and low frequency in range of 0–3000 Hz, and the transfer loss of muffler was basically 0 dB pass frequency at 1100 Hz. According to previous single-factor study experience, the structural factors, such as the expansion ratio, insertion length of outlet perforated pipe, the distance between the diaphragm and the front part of muffler, have influences on the acoustic performance of muffler at low frequency. Thus, they were taken as the starting point to study the influence of multiple interaction factors on the muffling performance by using orthogonal design method combined with the finite element analysis method. The influence degree of different structure parameters on the acoustic performance of muffler and the optimized structure parameters were obtained. Through the analysis on the acoustic characteristic of the optimized muffler, it indicated that the transmission loss of the improved muffler had significant increase in other frequency range except the range of 650–800 Hz and 2500–2700 Hz, especially at frequency of 1100 Hz compared with the original muffler. In the range of 0–3000 Hz, the mean of transmission loss of the improved muffler was about 9.8 dB larger than that of original muffler, which indicated that better noise cancellation effect was achieved. The improved muffler also provided a certain reference for the structural improvement of similar muffler.https://doi.org/10.1177/1461348418825200 |
| spellingShingle | Jun Fu Minghui Xu Zengfeng Zhang Wenjie Kang Yong He Muffler structure improvement based on acoustic finite element analysis Journal of Low Frequency Noise, Vibration and Active Control |
| title | Muffler structure improvement based on acoustic finite element analysis |
| title_full | Muffler structure improvement based on acoustic finite element analysis |
| title_fullStr | Muffler structure improvement based on acoustic finite element analysis |
| title_full_unstemmed | Muffler structure improvement based on acoustic finite element analysis |
| title_short | Muffler structure improvement based on acoustic finite element analysis |
| title_sort | muffler structure improvement based on acoustic finite element analysis |
| url | https://doi.org/10.1177/1461348418825200 |
| work_keys_str_mv | AT junfu mufflerstructureimprovementbasedonacousticfiniteelementanalysis AT minghuixu mufflerstructureimprovementbasedonacousticfiniteelementanalysis AT zengfengzhang mufflerstructureimprovementbasedonacousticfiniteelementanalysis AT wenjiekang mufflerstructureimprovementbasedonacousticfiniteelementanalysis AT yonghe mufflerstructureimprovementbasedonacousticfiniteelementanalysis |