Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside
To increase the noise proof performance of a cover with aperture excited by diffuse acoustic fields from the outside, it is a problem to prevent the occurrence of the inner acoustic mode at the lower frequencies. Authors had suggested the feed forward active noise control (ANC) for the acoustic fiel...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-06-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00106/_pdf/-char/en |
| _version_ | 1828126093583843328 |
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| author | Daisuke MUTO Yasushi TAKANO Takao YAMAGUCHI |
| author_facet | Daisuke MUTO Yasushi TAKANO Takao YAMAGUCHI |
| author_sort | Daisuke MUTO |
| collection | DOAJ |
| description | To increase the noise proof performance of a cover with aperture excited by diffuse acoustic fields from the outside, it is a problem to prevent the occurrence of the inner acoustic mode at the lower frequencies. Authors had suggested the feed forward active noise control (ANC) for the acoustic field inside the cover. Diffuse acoustic field excitation experiment using reverberant room has been examined to comprehend acoustic characteristics inside the cover. The results show that the inner cover field is in the state of locally coherent at the frequencies of inner acoustic mode, so that it is good environment for the active noise control. Then, a calculation with two-dimensional finite difference time domain (FDTD) method has been done to examine the feasibility of feed forward ANC. The results show that it is possible to realize ANC for the acoustic field inside the cover by proper design of control filter. Finally, experimental measurement of diffuse acoustic field excitation in the reverberant room has been done again to examine the ANC with the design method mentioned above. The results show that feed forward ANC can reduce noise level by 5dB at the peak frequency caused by the inner acoustic mode. Furthermore, the inner acoustic pressure distribution is also reduced uniformly at the frequency. Therefore, it is concluded that it is possible to realize feed forward active noise control for the acoustic field inside the cover with aperture excited by diffuse acoustic fields from the outside, even if the excitation is random or the causality of I/O is not satisfied. |
| first_indexed | 2024-04-11T15:29:52Z |
| format | Article |
| id | doaj.art-49933cf9b2d24f65a98fa1baa065be4a |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T15:29:52Z |
| publishDate | 2017-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-49933cf9b2d24f65a98fa1baa065be4a2022-12-22T04:16:10ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-06-018385517-0010617-0010610.1299/transjsme.17-00106transjsmeActive noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outsideDaisuke MUTO0Yasushi TAKANO1Takao YAMAGUCHI2Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd.Center for Technology Innovation - Mechanical Engineering, Research & Development Group, Hitachi, Ltd.Graduate School of Science and Technology, Gunma UniversityTo increase the noise proof performance of a cover with aperture excited by diffuse acoustic fields from the outside, it is a problem to prevent the occurrence of the inner acoustic mode at the lower frequencies. Authors had suggested the feed forward active noise control (ANC) for the acoustic field inside the cover. Diffuse acoustic field excitation experiment using reverberant room has been examined to comprehend acoustic characteristics inside the cover. The results show that the inner cover field is in the state of locally coherent at the frequencies of inner acoustic mode, so that it is good environment for the active noise control. Then, a calculation with two-dimensional finite difference time domain (FDTD) method has been done to examine the feasibility of feed forward ANC. The results show that it is possible to realize ANC for the acoustic field inside the cover by proper design of control filter. Finally, experimental measurement of diffuse acoustic field excitation in the reverberant room has been done again to examine the ANC with the design method mentioned above. The results show that feed forward ANC can reduce noise level by 5dB at the peak frequency caused by the inner acoustic mode. Furthermore, the inner acoustic pressure distribution is also reduced uniformly at the frequency. Therefore, it is concluded that it is possible to realize feed forward active noise control for the acoustic field inside the cover with aperture excited by diffuse acoustic fields from the outside, even if the excitation is random or the causality of I/O is not satisfied.https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00106/_pdf/-char/ennoise proof coveracoustic modefinite difference time domainactive noise control |
| spellingShingle | Daisuke MUTO Yasushi TAKANO Takao YAMAGUCHI Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside Nihon Kikai Gakkai ronbunshu noise proof cover acoustic mode finite difference time domain active noise control |
| title | Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| title_full | Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| title_fullStr | Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| title_full_unstemmed | Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| title_short | Active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| title_sort | active noise control for acoustic field inside the cover with aperture excited by diffuse acoustic field from the outside |
| topic | noise proof cover acoustic mode finite difference time domain active noise control |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00106/_pdf/-char/en |
| work_keys_str_mv | AT daisukemuto activenoisecontrolforacousticfieldinsidethecoverwithapertureexcitedbydiffuseacousticfieldfromtheoutside AT yasushitakano activenoisecontrolforacousticfieldinsidethecoverwithapertureexcitedbydiffuseacousticfieldfromtheoutside AT takaoyamaguchi activenoisecontrolforacousticfieldinsidethecoverwithapertureexcitedbydiffuseacousticfieldfromtheoutside |