Influence of Fabric Folding Geometry on the Sound Absorption

ABSTRACT

Textile materials used without any other structures show low absorption throughout the operating frequency range, and they are currently used for interior decoration. These fabrics can play an important role in the development of acoustic materials considering folding techniques in the design phase. The folding of a cotton fabric not only affects the esthetic appearance but also directly influences the total absorption surface and the volumetric density. The aim of this research was to establish the influence of geometric design parameters, such as the number of folds and the textile length on the sound absorption properties. Experimental measurements were performed by using an impedance tube considering only incident plane waves. The diffuse-field sound absorption coefficient of several fabric configurations placed in front of a rigid backing forming an air-cavity between them was also measured in the small-sized reverberation chamber. A semi-empirical model based on the spacing between the fabric to the backing wall and the folding geometry was used in order to predict the diffuse-field sound absorption in reverberation room. Results showed a very good agreement between measured and predicted sound absorption coefficients.

摘要

在整个工作频率范围内，不使用任何其他结构的纺织材料的吸收率较低，目前用于室内装饰. 这些织物在设计阶段考虑折叠技术的声学材料开发中可以发挥重要作用. 棉织物的折皱不仅影响其外观的美观，而且直接影响其总吸收面和体积密度. 本研究的目的是建立几何设计参数，如折叠次数和织物长度对吸声性能的影响. 实验测量采用阻抗管，只考虑入射平面波. 在小型混响室中测量了几种织物结构在刚性背衬前形成空气腔的漫场吸声系数. 采用基于织物与背墙间距和折叠几何结构的半经验模型，对混响室内的漫射场吸声进行了预测. 结果表明，实测吸声系数与预测吸声系数有很好的一致性.

KEYWORDS:

• Sound absorption
• folding geometry
• cotton fabric
• impedance tube
• reverberation chamber
• prediction model

关键词:

• 吸声
• 折叠几何学
• 棉织物
• 阻抗管
• 混响室
• 预测模型

Conflicts of Interest

The authors declare no conflicts of interest with respect to the research, publication and authorship of this article.

Additional information

Funding

This research was financially supported by the Ministry of Economy and Innovation (MINECO) and the European Union FEDER through project FIS2015-65998-C2-2 and by project ACIF/2017/073 by Regional Ministry of Education, Culture and Sport of the Generalitat Valenciana and with the support of European Structural Investment Funds (ESIF-European Union);European Structural Investment Funds [ACIF/2017/073];