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Simplification of the Delany-Bazley approach for modelling the acoustic properties of a poroelastic foam

机译:用于建模多孔弹性体声学特性的Delany-Bazley方法的简化

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摘要

The acoustic performance of mufflers is often enhanced by the inclusion of dissipative materials. A simplified implementation of the Delany-Bazley method is presented which facilitates the acoustic characterisation of poroelastic foam in computational models in the absence of material airflow resistivity data. The acoustic characteristics of a polyurethane foam material were experimentally obtained using a two-cavity impedance tube method. A finite element model of an expansion chamber design incorporating foam is presented. Numerical results of the transmission loss for the foam-filled muffler are compared with results obtained experimentally using a two-microphone acoustic pulse method.
机译:消声器的声学性能通常通过包含耗散材料而得到增强。提出了Delany-Bazley方法的简化实现,该方法有助于在没有材料气流阻力数据的情况下,简化计算模型中多孔弹性泡沫的声学表征。使用两腔阻抗管法通过实验获得了聚氨酯泡沫材料的声学特性。提出了包含泡沫的膨胀室设计的有限元模型。将填充泡沫的消声器的传输损失的数值结果与使用两麦克风声脉冲法的实验结果进行了比较。

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