Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data
In this study, the sound absorption coefficients of rice and buckwheat husks were estimated. Computed tomography (CT) images were processed to determine the circumference and surface area of voids in the granular material, and the normal incident sound absorption coefficients were derived. In additi...
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MDPI AG
2023-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/16/5671 |
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| author | Shuichi Sakamoto Kentaro Toda Shotaro Seino Kohta Hoshiyama Takamasa Satoh |
| author_facet | Shuichi Sakamoto Kentaro Toda Shotaro Seino Kohta Hoshiyama Takamasa Satoh |
| author_sort | Shuichi Sakamoto |
| collection | DOAJ |
| description | In this study, the sound absorption coefficients of rice and buckwheat husks were estimated. Computed tomography (CT) images were processed to determine the circumference and surface area of voids in the granular material, and the normal incident sound absorption coefficients were derived. In addition, the tortuosity, which expresses the complexity of the sound wave propagation through the structure, was measured for each material. The theoretical sound absorption coefficients were then compared to the measured sound absorption coefficients with and without consideration of the tortuosity. A correction factor was used to bring the surface area of the granular material closer to the actual surface area and observed that the tortuosity obtained theoretical values that matched the trend of the measured values. These results indicate that using CT images to estimate the sound absorption coefficient is a viable approach. |
| first_indexed | 2024-03-10T23:46:57Z |
| format | Article |
| id | doaj.art-df512b9fb1d94052b812c15d474b2223 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T23:46:57Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
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| spelling | doaj.art-df512b9fb1d94052b812c15d474b22232023-11-19T02:01:03ZengMDPI AGMaterials1996-19442023-08-011616567110.3390/ma16165671Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan DataShuichi Sakamoto0Kentaro Toda1Shotaro Seino2Kohta Hoshiyama3Takamasa Satoh4Department of Engineering, Niigata University, Ikarashi 2-no-cho 8050, Nishi-ku, Niigata 950-2181, JapanGraduate School of Science and Technology, Niigata University, Ikarashi 2-no-cho 8050, Nishi-ku, Niigata 950-2181, JapanGraduate School of Science and Technology, Niigata University, Ikarashi 2-no-cho 8050, Nishi-ku, Niigata 950-2181, JapanGraduate School of Science and Technology, Niigata University, Ikarashi 2-no-cho 8050, Nishi-ku, Niigata 950-2181, JapanFukoku Co., Ltd., 6 Showa Chiyoda-machi, Oura-gun, Gunma 370-0723, JapanIn this study, the sound absorption coefficients of rice and buckwheat husks were estimated. Computed tomography (CT) images were processed to determine the circumference and surface area of voids in the granular material, and the normal incident sound absorption coefficients were derived. In addition, the tortuosity, which expresses the complexity of the sound wave propagation through the structure, was measured for each material. The theoretical sound absorption coefficients were then compared to the measured sound absorption coefficients with and without consideration of the tortuosity. A correction factor was used to bring the surface area of the granular material closer to the actual surface area and observed that the tortuosity obtained theoretical values that matched the trend of the measured values. These results indicate that using CT images to estimate the sound absorption coefficient is a viable approach.https://www.mdpi.com/1996-1944/16/16/5671rice husksbuckwheat husksmicro-CT scantortuositysound absorption coefficient |
| spellingShingle | Shuichi Sakamoto Kentaro Toda Shotaro Seino Kohta Hoshiyama Takamasa Satoh Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data Materials rice husks buckwheat husks micro-CT scan tortuosity sound absorption coefficient |
| title | Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data |
| title_full | Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data |
| title_fullStr | Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data |
| title_full_unstemmed | Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data |
| title_short | Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data |
| title_sort | theoretical and experimental analyses on the sound absorption coefficient of rice and buckwheat husks based on micro ct scan data |
| topic | rice husks buckwheat husks micro-CT scan tortuosity sound absorption coefficient |
| url | https://www.mdpi.com/1996-1944/16/16/5671 |
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