抗性消声器传递损失预测的三维时域计算方法

徐航手;季振林;康钟绪

振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 107-110.

PDF(1075 KB)
PDF(1075 KB)
振动与冲击 ›› 2010, Vol. 29 ›› Issue (4) : 107-110.
论文

抗性消声器传递损失预测的三维时域计算方法

  • 徐航手;季振林;康钟绪
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Three-dimensional time-domain computational approach for prediction of transmission loss of reactive silencers

  • XU Hangshou; JI Zhenlin; KANG Zhongxu
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摘要


将三维时域计算方法应用于计算无流和有流条件下抗性消声器的传递损失,具体过程为:首先在消声器进口施加压力脉冲信号,然后通过三维非定常流体动力学计算获得消声器上游和下游的压力波动,最后由快速傅里叶变换将时间域的入射压力信号和透射压力信号转化到频率域,从而计算得到消声器的传递损失。使用该方法计算了无流和有流条件下抗性消声器和穿孔管消声器的传递损失,数值计算结果与文献中的实验测量结果吻合良好。





Abstract

The three-dimensional time-domain computational approach is employed to calculate the transmission loss of reactive silencers without and with flow. The detailed procedure is explained as follows: a pressure pulse is imposed at the inlet of silencer, and then the three-dimensional unsteady fluid dynamics computation is performed to acquire the pressure perturbations at the upstream and downstream of silencer. Finally,the incident and the transmitted pressure signals in the time-domain are transformed to the frequency domain by means of FFT, therefore the transmission loss of silencer can be determined. The transmission losses of reactive and perforated tube silencers without and with flow are calculated using this approach, and the numerical predictions agree reasonable well with the experimental results in the literature.

关键词

声学 / 抗性消声器 / 传递损失 / 三维时域计算方法 / 流动效应

Key words

acoustics / reactive silencer / transmission loss / three-dimensional time-domain computational approach / flow effect

引用本文

导出引用
徐航手;季振林;康钟绪. 抗性消声器传递损失预测的三维时域计算方法[J]. 振动与冲击, 2010, 29(4): 107-110
XU Hangshou;JI Zhenlin;KANG Zhongxu. Three-dimensional time-domain computational approach for prediction of transmission loss of reactive silencers[J]. Journal of Vibration and Shock, 2010, 29(4): 107-110

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