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.
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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