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首页> 外文期刊>Building and Environment >Sound transmission loss analysis through a multilayer lightweight concrete hollow brick wall by FEM and experimental validation
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Sound transmission loss analysis through a multilayer lightweight concrete hollow brick wall by FEM and experimental validation

机译：多层轻质混凝土空心砖墙传声损失的有限元分析和实验验证

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摘要

This research work tries to find the most efficient numerical procedure to predict the transmission loss (TL) through a multilayer wall for frequencies ranging from 100 to 5000 Hz. The wall is made of lightweight concrete hollow bricks joined by mortar, with gypsum lining on both faces. This study is motivated by the need to develop new products with better acoustic properties of airborne sound insulation. In order to achieve this objective a set of tests using source and receiving chambers have been modelled according to the basic requirements of the UNE-EN ISO 140-1 standard rule. The constructive element is located between both chambers in order to evaluate its acoustic behaviour according to the UNE-EN ISO 717-1 standard rule. Applying the finite element method (FEM), a two-dimensional model with fluid-structure interaction has been built in the case of the horizontal and vertical planes, with the purpose of including the different eigenfrequencies of the rooms. The values of the average sound pressure in both test chambers have been calculated for different excitation sources: uni and omnidirectional waves. The convergence and accuracy of the proposed method are then assessed by comparing FEM results with experimental measurements carried out by a certified laboratory. Finally, the numerical procedure implemented in this work may be useful to evaluate the acoustic behaviour for other structural building elements and reduce the manufacturing time to develop new products in construction.
机译：这项研究工作试图找到最有效的数值程序，以预测频率范围为100至5000 Hz的穿过多层壁的传输损耗（TL）。墙体是由轻质混凝土空心砖和砂浆连接而成，两面都衬有石膏。这项研究的动机是需要开发具有更好的机载隔音性能的新产品。为了实现此目标，已根据UNE-EN ISO 140-1标准规则的基本要求对使用发射室和接收室的一组测试进行了建模。构造元件位于两个腔室之间，以便根据UNE-EN ISO 717-1标准规则评估其声学性能。应用有限元方法（FEM），在水平面和垂直平面的情况下，建立了具有流固耦合的二维模型，目的是包括房间的不同本征频率。已经针对不同的激励源（单向和全向波）计算了两个测试室内的平均声压值。然后通过将有限元分析结果与认证实验室进行的实验测量值进行比较，来评估所提出方法的收敛性和准确性。最后，在这项工作中实施的数值程序可能对评估其他结构建筑构件的声学性能并减少制造开发新产品的制造时间可能有用。

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