穿孔管式消声单元气流再生噪声总功率模型

赵海军;邓兆祥;李沛然

振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 118-122.

PDF(1238 KB)
PDF(1238 KB)
振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 118-122.
论文

穿孔管式消声单元气流再生噪声总功率模型

  • 赵海军1,3; 邓兆祥1,2; 李沛然1
作者信息 +

Total Power Model of Flow Noise Generation from Perforated Duct Muffler Element

  • ZHAO Hai-jun1,3; DENG Zhao-xiang1,2; LI Pei-ran1
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文章历史 +

摘要

采用正交试验设计方法确定了穿孔管式消声单元试验样件的具体结构参数,在自行研制的试验台上进行了气流再生噪声测量。根据量纲分析建立了气流再生噪声总功率与结构参数及气流速度的关系模型,利用超静定最小二乘法求解了模型参数,并检验了模型的显著性,利用该模型对气流再生噪声的影响因素进行探讨。结果表明,在显著性水平0.01下,所建模型是高度显著的;穿孔直径和穿孔部分长度的减小均有利于气流再生噪声的降低,而穿孔率和腔体直径对气流再生噪声的影响较小。频谱分析发现,随气流速度增大,气流再生噪声突出峰值频率有向中高频移动的趋势,强度也有所增大,在斯德鲁哈尔数为0.2~0.35的范围内,存在一突出峰值频率,该处的声能量约占总能量的60%以上。

Abstract

Using orthogonal experimental design method detailed structure parameters of work piece about perforated tube muffler element are determined. Flow noise regeneration is measured on the self developing test bench. Relationship model on total sound power of flow regeneration noise and structure parameter and flow velocity is established utilizing dimensional analysis, model parameters are solved making use of hyper static least square method. Significance test of the model is performed, the law of total sound power level for muffler element flow regeneration noise changing with the parameters is discussed. Result shows that the established models are all highly significant under 0.01 levels, the reducing of the perforated diameter and the perforated part length is favor of the reduction of flow regeneration noise from perforated tube muffler element, and perforated ratio and expansion chamber diameter have less effect on flow regeneration noise. After analyzing spectrum structure of flow regeneration noise, it is indicated that with the increase of flow velocity projected peak value frequency has the trend of moving to middle and high, its strength also becomes bigger. When the range of Strouhal number is from 0.2 to 0.35, there is a peak value frequency, its sound energy in the frequency accounts for about 60% of the total energy.

关键词

气流再生噪声 / 影响因素 / 穿孔管 / 消声器

Key words

Flow noise regeneration / Effect factors / Perforated pipe / Muffler

引用本文

导出引用
赵海军;邓兆祥;李沛然. 穿孔管式消声单元气流再生噪声总功率模型[J]. 振动与冲击, 2011, 30(8): 118-122
ZHAO Hai-jun;DENG Zhao-xiang;LI Pei-ran. Total Power Model of Flow Noise Generation from Perforated Duct Muffler Element[J]. Journal of Vibration and Shock, 2011, 30(8): 118-122

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