A new segmentation approach for sound propagation in non-uniform lined ducts with mean flow
A new segmentation approach for sound propagation in non-uniform lined ducts with mean flow
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DOI：
10.1016/j.jsv.2010.11.022
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发表时间：
2011-05
影响因子：
4.7
通讯作者：
Xiaoyu Wang;Xiaofeng Sun
中科院分区：
文献类型：
--
作者：
Xiaoyu Wang;Xiaofeng Sun
本文提出了一种研究均匀流作用下非均匀内衬管道声衰减的解析模型。这项工作是一个扩展的分割方法，重点是局部或非局部反应衬里在流动管道中的物理和数学描述。各种数值结果表明，该模型不仅对连续和突变截面的无流管道给出了与现有模型相同的预测结果，而且为非均匀流管道在声学处理初步设计阶段的声衰减优化提供了一种方便的工具。作为本模型的目标之一，还注意到如何提高声衰减在变流环境中的壁面阻抗的变化，使用偏流。特别是，一个更好的物理理解不同的衬垫组合的相互作用机制，可以预期的帮助下，所提出的模型。
An analytical model is presented to study sound attenuation in a non-uniform lined duct with mean flow in this paper. This work is an extension of segmentation approach with emphasis on the physical and mathematical descriptions of locally or non-locally reacting liners in flow ducts. Various numerical results show that the model not only gives the same prediction as the existing models for both continuously and abruptly varying cross-sectional area ducts without flow, but also provides a convenient tool for the optimization of sound attenuation in a non-uniform flow duct at the preliminary design stage of acoustic treatments. As one of the objectives of the present model, attention is also paid to how to improve the sound attenuation in a varying flow environment by the change of the wall impedance using bias flow. In particular, a better physical understanding to the interaction mechanism of different liner combinations may be expected with the help of the proposed model.