2005 Fiscal Year Final Research Report Summary
Method for reducing booming noise of a vehicle cabin using eigenfrequency-varying Origami-structure resonator
| Project/Area Number |
15560208
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Kanagawa Institute of Technology |
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Principal Investigator |
KOZUKUE Wakae Kanagawa Institute of Technology, Department of Mechanical Engineering, Professor, 工学部, 教授 (30288211)
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| Co-Investigator(Kenkyū-buntansha) |
HAGIWARA Ichiro Tokyo Institute of Technology, Department of Mechanical Science, Professor, 工学部, 教授 (50282843)
MIYAJI Hideyuki Kanagawa Institute of Technology, Department of Mechanical Engineering, Assistant Professor, 工学部, 助手 (60085131)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Vehicle / Vehicle Interior Noise / Booming Noise / Helmholtz Resonator / Origami / Coupled Structural-Acoustic System |
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| Research Abstract |
The reduction of interior noise by using a Helmholtz resonator is investigated by an analysis and experiment. As for an Origami structure Helmholtz resonator, an analysis model is constructed and its characteristics is examined by an analysis. The effect of an Origami structure is tried to be verified by experiment, but the manufacturing is found to be difficult and this problem cannot be tackled by experiment.
In the analysis the frequency response of sound pressure level at a passenger's ear position is calculated by the finite element method when the resonator model is attached to the simplified cabin model. Moreover, a coupled structural-acoustic system for the cabin and the resonator is executed. In the analysis for only the acoustic system the large reduction of the peak level at the resonance frequency is obtained. The phenomena in which the splitting of one peak to two peaks appears by a Helmholtz resonator is obtained. In the coupled system structural peaks exist, but in this study only acoustical peaks are examined. When two resonators are attached to the cabin the large difference between the set up position of the resonator is obtained in the analysis result and it is shown to be necessary that the attaching position is determined according to the characteristics of the objective mode. Moreover, when the three resonators are attached to the cabin model the expected effect for reduction is not obtained for peaks. It is considered to be desirable to optimize the attaching position by utilizing optimization analysis. For an analysis which uses only Origami structure Helmholtz resonator the change of the resonance frequency by adjusting the length of the throat of the resonator is confirmed.
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