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| Dynamic response and acoustic absorption characteristics of an infinite micro-perforated plate periodically stiffened by ribs |
| Received:August 18, 2012 Revised:December 10, 2012 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201302006 |
| KeyWord:dynamic response micro-perforated plate space harmonic acoustic absorption ribs |
| Author | Institution |
| 王晓明 |
大连理工大学 机械工程学院,大连 |
| 周海安 |
大连理工大学 机械工程学院,大连 |
| 梅玉林 |
大连理工大学 工业装备结构分析国家重点实验室,大连 |
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| Abstract: |
| The vibration response and acoustic absorption characteristics of an infinite micro-perforated plate periodically stiffened with ribs in two orthogonal directions,which is excited by a plane wave at an arbitrary incident angle,are analyzed in this paper.Based on fundamental acoustic formula of the micro-perforated plate of Maa Da You and Takahashi,a semi-analytical model of the vibration response of the studied structure is developed.Using the Fourier transform method and the space harmonic analysis method,the vibration displacement and acoustic radiation pressure of the micro-perforated plate are expressed as infinite sets of space harmonic amplitudes.After numerically solving these amplitudes,the vibration response and acoustic absorption coefficient of the micro-perforated plate in the physical space are finally derived by employing the Fourier inverse transform method.Numerical results indicate that the flexural vibration of the plate has a significant effect on the acoustic absorption in the water and has a certain influence for the light micro-perforated plate at the low frequency range in the air.It is also found that the absorption coefficient of the micro-perforated plate is strongly depended on its micro holes; meanwhile,the absorption performance can be effectively improved by adjusting the dimensions of stiffened ribs,especially in the water. |
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