通过直管噪声与带消声器的尾管声压级的对比，发现在低频段有一峰值。
We make a comparison in tailpipe noise between straight pipe and muffler, it is seen that there is a sharp peak in low frequent.
法兰部件，消声器，管端闭锁或联结装置及其形成方法和装置。
Flange member, noice silencer, tube end closure or connection device, and forming method and device.
使用有限元法计算穿孔管消声器的传递损失，并与实验测量结果进行了比较，二者吻合良好。
The predicted transmission loss of perforated tube silencers using the finite element method and experimental results are compared and showed good agreement.
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