Acoustic behavior of composites with gradient impedance
Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance. In this paper, composite structures with different gradi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-08-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127520304044 |
| _version_ | 1818455483734818816 |
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| author | Yiwen Feng Jing Qiao Longqiu Li |
| author_facet | Yiwen Feng Jing Qiao Longqiu Li |
| author_sort | Yiwen Feng |
| collection | DOAJ |
| description | Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance. In this paper, composite structures with different gradient impedances are proposed. The influence of impedance gradient forms and discrete layering methods on acoustic performance is investigated numerically and experimentally. It is found that the gradient structure with exponential form improves absorbing performance in low frequency best among all these forms studied in terms of absorption coefficient and reflection coefficient. The curvature of the exponential curves shows the greatest effects on the position of the first absorption peak and the corresponding absorption coefficient. Better acoustic properties can be obtained in the case when adopting the equivalent layering method by thickness than that of the method equally layering by impedance. These findings provide useful guidance for application of underwater acoustic impedance gradient medium in engineering, especially for designing customized anechoic coating. |
| first_indexed | 2024-12-14T22:11:30Z |
| format | Article |
| id | doaj.art-eeecfe236bc1461388e83fd83044846e |
| institution | Directory Open Access Journal |
| issn | 0264-1275 |
| language | English |
| last_indexed | 2024-12-14T22:11:30Z |
| publishDate | 2020-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj.art-eeecfe236bc1461388e83fd83044846e2022-12-21T22:45:45ZengElsevierMaterials & Design0264-12752020-08-01193108870Acoustic behavior of composites with gradient impedanceYiwen Feng0Jing Qiao1Longqiu Li2State Key Laboratory of Robotics and System, Harbin Institute of Technology, ChinaSchool of Materials Science and Engineering, Harbin Institute of Technology, China; Corresponding authors.State Key Laboratory of Robotics and System, Harbin Institute of Technology, China; Corresponding authors.Conventional acoustic materials with uniform media which are of fixed impedance and density are unable to satisfy the requirements of the development of modern acoustic technology in volume, weight, pressure resistance and stealth performance. In this paper, composite structures with different gradient impedances are proposed. The influence of impedance gradient forms and discrete layering methods on acoustic performance is investigated numerically and experimentally. It is found that the gradient structure with exponential form improves absorbing performance in low frequency best among all these forms studied in terms of absorption coefficient and reflection coefficient. The curvature of the exponential curves shows the greatest effects on the position of the first absorption peak and the corresponding absorption coefficient. Better acoustic properties can be obtained in the case when adopting the equivalent layering method by thickness than that of the method equally layering by impedance. These findings provide useful guidance for application of underwater acoustic impedance gradient medium in engineering, especially for designing customized anechoic coating.http://www.sciencedirect.com/science/article/pii/S0264127520304044Multiple layerGradientFinite element methodAcoustic propertiesComposites |
| spellingShingle | Yiwen Feng Jing Qiao Longqiu Li Acoustic behavior of composites with gradient impedance Materials & Design Multiple layer Gradient Finite element method Acoustic properties Composites |
| title | Acoustic behavior of composites with gradient impedance |
| title_full | Acoustic behavior of composites with gradient impedance |
| title_fullStr | Acoustic behavior of composites with gradient impedance |
| title_full_unstemmed | Acoustic behavior of composites with gradient impedance |
| title_short | Acoustic behavior of composites with gradient impedance |
| title_sort | acoustic behavior of composites with gradient impedance |
| topic | Multiple layer Gradient Finite element method Acoustic properties Composites |
| url | http://www.sciencedirect.com/science/article/pii/S0264127520304044 |
| work_keys_str_mv | AT yiwenfeng acousticbehaviorofcompositeswithgradientimpedance AT jingqiao acousticbehaviorofcompositeswithgradientimpedance AT longqiuli acousticbehaviorofcompositeswithgradientimpedance |