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Test of single degree of freedom acoustic treatment impedance models for multimodal acoustic propagation in duct with flow

机译:用流量对瓦尔管道多峰声传播的单一自由声学处理阻抗模型的测试

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摘要

Passive acoustic treatments, also called liners, are the main solution to noise problems. The Single Degree Of Freedom (SDOF) acoustic treatment, composed of a thin material (perforated plate) affixed to air cavities with a rigid bottom, constitutes a solution. Predicting sound level reduction by an SDOF treatment requires reliable acoustic impedance models. An experimental/numerical method has been developed for a duct with an acoustic treatment to test acoustic impedance models of SDOF treatment with a multimodal propagation in the presence of a mean flow. This method is based on the comparison of experimental results from an aeroacoustic bench composed of a circular duct with a treated area, and numerical results from an FEM-PML axisymmetric model based on Galbrun's equation. The numerical results are confronted with experimental results to test impedance models up to M-0 = +/- 0.25. (C) 2017 Acoustical Society of America.
机译:被动声处理,也称为衬里,是噪声问题的主要解决方案。 由薄材料(穿孔板)构成的单一自由度(SDOF)声学处理构成具有刚性底部的空腔,构成溶液。 通过SDOF处理预测声级减少需要可靠的声阻抗模型。 已经为具有声学处理的管道开发了一种实验/数值方法,以测试SDOF处理的声阻抗模型,在平均流动存在下具有多模级传播。 该方法基于由具有处理区域的圆形管道组成的空气声长凳的实验结果的比较,以及基于Galbrun方程的FEM-PML轴对称模型的数值结果。 数值结果与实验结果相反,测试阻抗模型高达M-0 = +/- 0.25。 (c)2017年声学社会。

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    Univ Technol Compiegne Sorbonne Univ CNRS Unite Mixte Rech Roberval 7337 Ctr Rech Royallieu F-60203 Compiegne France;

    Univ Technol Compiegne Sorbonne Univ CNRS Unite Mixte Rech Roberval 7337 Ctr Rech Royallieu F-60203 Compiegne France;

    Univ Technol Compiegne Sorbonne Univ CNRS Unite Mixte Rech Roberval 7337 Ctr Rech Royallieu F-60203 Compiegne France;

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  • 正文语种 eng
  • 中图分类 声学;
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