发动机排气噪声是整车噪声的主要噪声源之一。
The exhaust noise of engine is one of the main noise sources of automobile noise.
发动机排气噪声是汽车噪声中一个主要声源，消声器是控制排气噪声的一个重要方法。
Engine exhaust noise is one of the main sources of automobile noise, and using of silencer is an important method controlling exhaust noise.
根据特种发动机排气噪声的特性和消声器的安装要求，设计了一个组合式排气消声器。
According to the exhaust noise characteristics of special engine and the installation request of exhaust muffler, the exhaust muffler for special engine was designed.
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.
排气系统具有控制发动机排气噪声的重要作用，所以对发动机排气系统进行仿真分析很有必要。
The exhaust systems play the important role of controlling the engine exhaust noise, so it is necessary to simulate and analyse the characteristics of the exhaust system.
发动机排气噪声是工程机械整机噪声中最主要的噪声源，对于工程机械整机噪声水平的高低有重要的影响。
Engine exhaust noise is a main source for construction machinery noise, and it has a very significant impact on the level of construction machinery noise.
排气系统可以降低从发动机气缸排出的已燃废弃的噪声，并且安全地将这些废气带走使其远离汽车内的人。
The exhaust system reduces the noise of the burned gases leaving the engine cylinders and carries these exhaust gases safely away from the people in the car.
由于航空发动机转速高，空气流量大，排气温度高，试车时产生的强烈噪声形成大范围的环境污染；
Aerogine has the features of high rev, heavy air flux and high exhaust temperature, fierceness of noise engenders environment pollution largely during aeroengine test.
研究结果表明：该模型在发动机纯排气噪声预测方面具有足够的精度；
Simulation calculation and experimental study for the pure exhaust noise of engine were carried out under the same operating conditions.
汽车发动机进排气系统的噪声在发动机总噪声中占有重要分量，因此需要积极采取降噪措施。
The car noise admission and exhaust system of the engine is a very important problem, therefore we must adopt innovative technic to reduce noise.
内燃机排气系噪声试验中，在某种转速下，排气系发生共振，从而使发动机噪声大大增加。
In concurrence with the exhaust system resonance occurs at certain engine rotating speed during testing, the noise level of engine will substantially increase.
介绍了为降低排气噪声而改善发动机排气系统设计的方法和摩托车使用过程中应采取的措施。
The paper also describes the improved design method of motorcycle engine exhaust system which reduces the exhaust noise and the measures the motorcycle should take during its operation.
当它对柴油发动机汽缸排气余热回收时，大大地降低了噪声，且排气中油烟亦基本消除。
During the recovery of heat energy from the cylinder exhaust of diesel engines, the installation can greatly reduce noise pollution and mostly eliminate exhaust lampblack.
因此，解决该拖拉机噪声问题须首先降低排气噪声、发动机散热风扇噪声和发动机机罩振动噪声。
Therefore, in order to solve the problem of the tractor noise, the exhaust noise, the engine ventilator noise and the noise of vibrating cover of the engine should be reduced first.
介绍噪声的特征、危害性和交通车辆噪声，包括汽车排气噪声、发动机噪声、轮胎噪声和喇叭噪声等。
The features and harmfulness of noises including the traffic noises produced by engine exhaust, tyre, horn, etc.
介绍噪声的特征、危害性和交通车辆噪声，包括汽车排气噪声、发动机噪声、轮胎噪声和喇叭噪声等。
The features and harmfulness of noises including the traffic noises produced by engine exhaust, tyre, horn, etc.
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