2013 Fiscal Year Final Research Report
Mode localiation phenomena of a multiple-wall structure and its application to active control
| Project/Area Number |
23760208
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Dynamics/Control
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| Research Institution | Seikei University (2013)
Tokyo Metropolitan University (2011-2012) |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2012
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| Keywords | 連成現象 / 波動制御 / 遮音制御 |
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| Research Abstract |
The objective of this study is to present a method for suppressing sound radiation from a multiple-walled cavity based on the mode localization phenomenon in which the low-frequency vibration and/or sound is trapped in the intermediate layer. First, based on the modal coupling method, a state matrix equation of a multi-walled cavity is derived. Next, the existence of the coupling term which plays an important role in energy transfer between flexible panels is clarified, numerically demonstrating that the localization control is achieved by minimizing the coupling term. Finally, in respect of the precise modeling of the multi-walled cavity, by introducing the transfer matrix approach, a novel modeling method is presented in which vibrational input to the acoustical field is explicitly described and particle velocity does not become zero at a coupling plane.
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