Sgard Franck, Nelisse Hugues, Atalla Noureddine
Laboratoire des Sciences de l'Habitat, DGCB URA CNRS 1652, Ecole Nationale des Travaux Publics de l'Etat, Vaulx-en-Velin Cedex, France.
J Acoust Soc Am. 2007 Jul;122(1):302-13. doi: 10.1121/1.2735109.
The modeling of the diffuse field sound transmission loss (TL) of apertures has been rarely considered in the literature. The aims of this paper are (i) to give a comprehensive review of the existing models, (ii) to propose a general efficient and rigorous numerical method to predict the diffuse field TL of apertures of rectangular and circular cross section, (iii) to provide the reader with numerical results regarding this indicator together with its relation with the normal incidence case for various geometrical configurations, and (iv) to conclude on the relevance of using such a sophisticated model compared to more classical normal incidence ones. The proposed approach is based on the description of the sound field inside the aperture in terms of propagating and evanescent acoustic modes. The radiation of the aperture is accounted for using a modal radiation impedance matrix. The coupled problem is solved in terms of modal contribution factors. The convergence of the approach is then investigated and the model is validated by comparisons with existing models for various configurations and excitations. Several numerical examples are provided regarding the normal incidence and diffuse field TL for various apertures and the relationship between these two indicators is discussed.
文献中很少考虑孔径的扩散场声传输损失（TL）建模。本文的目的是：（i）对现有模型进行全面综述；（ii）提出一种通用、高效且严格的数值方法，以预测矩形和圆形横截面孔径的扩散场TL；（iii）为读者提供关于该指标的数值结果，以及其与各种几何构型下垂直入射情况的关系；（iv）与更经典的垂直入射模型相比，总结使用这种复杂模型的相关性。所提出的方法基于用传播和倏逝声模态来描述孔径内的声场。使用模态辐射阻抗矩阵来考虑孔径的辐射。根据模态贡献因子求解耦合问题。然后研究该方法的收敛性，并通过与各种构型和激励的现有模型进行比较来验证模型。提供了几个关于各种孔径的垂直入射和扩散场TL的数值示例，并讨论了这两个指标之间的关系。
