The property of the hybrid active silencer relies on the equivalent impedance at the secondary sound source position and the impedance distribution characteristics of the one-chamber pipe itself.
研究结果表明，复合有源消声器的消声效果取决于次级扬声器位置的等效声阻抗以及无源式消声管道本身的阻抗分布特性。
The transmission matrix of rigid straight pipe with mean flow and linear temperature gradient is established according to the actual case of silencer.
本文根据消声器在实际工作过程中声管内温度发生变化的特点，推导了考虑气流和线性温度梯度情况下刚性直管的声场传递矩阵。
Pipe with a silencer function by a spiral UPVC pipes, basement floors and garage are equipped with pumping station sump and waste water lifting devices.
管材采用了具有消声功能的螺旋UPVC排水管，地下室内泵房地面及车库均设有集水坑和废水提升装置。
Pipe with a silencer function by a spiral UPVC pipes, basement floors and garage are equipped with pumping station sump and waste water lifting devices.
管材采用了具有消声功能的螺旋UPVC排水管，地下室内泵房地面及车库均设有集水坑和废水提升装置。
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