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Characterization of the acoustic impedance of in-situ vegetated roofs

机译：原位植物屋顶声阻抗的特征

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摘要

Vegetated roof systems can act as absorbers to mitigate traffic noise. Various properties of vegetated roofs, such as open porosity, are important for sound absorption and scattering in urban environments. Substratum has been identified as the major contributor to the acoustic absorption of vegetated roofs. However, the coverage of the substratum by plants may have a significant effect on its acoustic absorption. Most existing studies on the determination of the acoustic absorption of vegetated roofs are based either on laboratory experiments or numerical models. So far, little research has focused on the prediction of vegetated roofs' impedance based on in-situ measurements. This research modified the existing Nordtest Method for measurements at vegetated roofs. It was modified to an extended reacting double-layer medium with a variable reference surface, surface roughness was included and the three-parameter Mild impedance model was used. Using measurements on four different in-situ green roofs, a good agreement between measured and predicted results was obtained with the modified Nordtest Method. Finally, some simplifications in the modified Nordtest Method were found to reduce the complexity of the prediction without sacrificing accuracy too much. (C) 2020 Elsevier Ltd. All rights reserved.
机译：植被屋顶系统可以充当吸收剂以减轻交通噪音。植被屋顶的各种性质，如开放孔隙度，对于城市环境中的吸声和散射都很重要。 SubstraTum已被确定为植被屋顶声学吸收的主要贡献者。然而，植物覆盖物的覆盖可能对其声学吸收具有显着影响。大多数关于测定植被屋顶的声学吸收的研究基于实验室实验或数值模型。到目前为止，基于原位测量，小型研究专注于预测植被屋顶的阻抗。该研究改进了现有的NORDTEST方法来植被屋顶测量。它被修改为延伸的反应双层介质，其中具有可变参考表面，包括表面粗糙度，使用三参数轻度阻抗模型。在四个不同的原位绿色屋顶上使用测量，通过改进的NORDTEST方法获得了测量和预测结果之间的良好一致性。最后，发现修改的NORDTEST方法中的一些简化来降低预测的复杂性，而不会太多牺牲精度。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Applied Acoustics》 |2021年第1期|107514.1-107514.15|共15页
  • 作者

    Liu Chang; Georgiou Fotis; Hornikx Maarten;

  • 作者单位

    Chongqing Univ Fac Architecture & Urban Planning Chongqing 400045 Peoples R China|Chongqing Univ Key Lab New Technol Construct Cities Mt Area Minist Educ Chongqing 400045 Peoples R China|Eindhoven Univ Technol Dept Built Environm POB 513 NL-5600 MB Eindhoven Netherlands;

    Eindhoven Univ Technol Dept Built Environm POB 513 NL-5600 MB Eindhoven Netherlands;

    Eindhoven Univ Technol Dept Built Environm POB 513 NL-5600 MB Eindhoven Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Acoustic surface impedance; Vegetated roof; Surface roughness;

    机译：声学表面阻抗;植被屋顶;表面粗糙度;

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