Title: Research of sound absorption characteristics for the periodically porous structure and its application in automobile
Abstract:The paper researches sound absorption characteristics of a periodically porous structure by combing transfer matrix method and a standing wave tube experiment. It is shown in results that the sound ab...The paper researches sound absorption characteristics of a periodically porous structure by combing transfer matrix method and a standing wave tube experiment. It is shown in results that the sound absorption effect of the periodical structure is better than that of a single-layer porous structure with the same thickness in the range of the low-frequency band. In addition, for the periodical structure with the same thickness, the sound absorption effect will not continuously increase along with the period number increase, and there is an optimal period number. In order to verify the actual sound absorption effect of the periodically porous structure, the paper tries to apply the structure in an automobile. Modal experiment is conducted to the automobile body, and the experimental results are compared with the simulated results. The relative errors are controlled within 5 % which is the critical value in engineering, and it indicates that the finite element model is reliable and can be used in the subsequent acoustic calculation. It is found in panel contribution analysis that noise in automobile is seriously influenced by the roof. Therefore, the periodically porous structure and a single-layer porous structure with the same thickness are applied to the roof panel. It is shown that the periodically porous structure has a more prominent sound absorption effect when it is compared with that of the other structures. This research also lays a foundation for broadening this application in the other structures.Read More
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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