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圆坑织构高速列车气固界面的摩擦噪声分析

, PP. 53-59

Keywords: 高速列车,圆坑织构,气固界面,噪声模型,降噪

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Abstract:

以Prandtl边界层理论和摩擦噪声理论为基础,建立了高速列车车厢气固界面的噪声模型,分析了边界层内部的压力场、速度场和噪声分布情况。仿生猎隼表面织构,以表面织构产生微小的涡流场减小空气摩擦阻力,并设计了车厢表面的圆坑织构,分析了圆坑织构参数对摩擦噪声分布的影响。分析结果表明优化织构的深径比、面积比与织构的拓扑结构可取得显著的降噪效果,与光滑界面相比,优化深径比的织构的摩擦噪声的最大降幅达到11dB,其他织构在一定高度能降低4~5dB。

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