基于模态的长围挡声场预测与分析

IF 0.3 4区工程技术 Q4 ACOUSTICS

Noise Control Engineering Journal Pub Date : 2021-11-01 DOI:10.3397/1/376949

C. Jiang, Xiang Liu, Stephany Y. Xu, Shangyu Zhang

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引用次数: 0

摘要

本文采用一种经过验证的基于模态的预测方法，检验了多孔天花板处理对降低典型隧道内噪声水平的效果。研究发现，对于点源，增加多孔天花板厚度对隧道沿线声压级（SPL）衰减的影响是有限的。在中频和高频范围内，厚度为0.3m的多孔天花板与无限多孔天花板相当。对于线源，在这种典型的隧道中，天花板厚度对SPL降低的影响是有限的。采用0.3m多孔天花板，声压级降低了4dBA，这与无限天花板相同，仅比理论优化值小1dBA。这些结果表明，在仅考虑天花板处理的情况下，0.3m的多孔材料足以在该典型隧道中降低噪音。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Prediction and analysis of sound field in long enclosures with a modal-based method

In this paper, the efficacy of porous ceiling treatment to reduce noise levels inside a typical tunnel is examined with a validated modal-based prediction method. It is found that, for a point source, the effect of increasing porous ceiling thickness on sound pressure level (SPL) attenuation along the tunnel is limited. A porous ceiling with thickness of 0.3 m is comparable with an infinite porous ceiling in middle and high frequency ranges. For a line source, the effect of ceiling thickness on SPL reduc- tion in this typical tunnel is limited. Sound pressure level reduction of 4 dBA is real- ized with 0.3 m porous ceiling, which is the same as infinite ceiling and only 1 dBA smaller than the theoretically optimized value. These results suggest that, in the event only ceiling treatment is considered, 0.3 m porous material is sufficient for noise re- duction in this typical tunnel.

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来源期刊

Noise Control Engineering Journal 工程技术-工程：综合

CiteScore

0.90

自引率

25.00%

发文量

审稿时长

3 months

期刊介绍： NCEJ is the pre-eminent academic journal of noise control. It is the International Journal of the Institute of Noise Control Engineering of the USA. It is also produced with the participation and assistance of the Korean Society of Noise and Vibration Engineering (KSNVE). NCEJ reaches noise control professionals around the world, covering over 50 national noise control societies and institutes. INCE encourages you to submit your next paper to NCEJ. Choosing NCEJ: Provides the opportunity to reach a global audience of NCE professionals, academics, and students; Enhances the prestige of your work; Validates your work by formal peer review.