穿孔屏对改善消声效果有较大的作用，同时，对发动机排气噪声中的脉动声有较好的消除作用；
The perforating shield contributes a lot in improving the muffling effect and at the same time has a function of eliminating the pulsating sound in the engine exhausting noise.
为了测量发动机进、排气管内气流的脉动流动特性，对自行设计的对气流起稳压作用的阻尼稳压箱进行了研究。
The effect of stabilizing pressure of a stable pressure box with damping line of the air flow is studied in order to measure the pulsate flow ability of air at the intake and exhaust pipes of engine.
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