发动机噪声是车辆噪声的重要来源。
提出了一种发动机噪声故障诊断的新方法。
This paper discusses a new approach of detecting faults in motorcycle motors.
开展对发动机噪声分析及控制研究有重要意义。
综述了近年来国际上对车辆及发动机噪声声音品质的研究现状。
This paper summarizes the research status for sound quality of vehicle and engine.
由于液压挺杆自动调节气门间隙为零间隙，同时可降低发动机噪声。
Because the hydraulic valve plunger automatic control valve clearance is zero gap, simultaneously may reduce the engine noise.
汽车发动机齿轮系统冲击振动所引起的噪声，是发动机噪声的主要来源之一。
The noise excited by impact and vibration of gear pairs in automobile engine is one of the main sources of noise.
发动机噪声是汽车的主要噪声源，空气动力噪声是发动机噪声的组成部分之一。
Engine noise is the major noise source of automobile; air power noise is one of composition parts of engine noise.
城市噪声的主要来源是车辆噪声，而发动机噪声又是车辆噪声的主要组成部分。
The noise in city mainly comes from the vehicle and the vehicle noise mostly from the engine.
试验结果表明该方法有较高的计算精度，为发动机噪声优化设计打下了良好的基础。
The experiment results indicated that this calculation method was precise, providing a good basis for the optimized design of the engine with low 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.
结果表明：发动机噪声主要是加性、低强度的连续频谱，在某几个频率成分上也分布着线状频谱。
The results show that the engine noise is additive weak-intensity continuous spectrum or compound spectrum and for some frequencies it is both continuous and linear.
试验结果表明，风扇噪声主要是宽频带噪声，并得出了在不同频率范围风扇噪声对发动机噪声的影响。
From the result, we know the fan noise is mostly a width frequency noise, then obtain the effect of the fan noise on the engine noise in the different frequency range.
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.
本实用新型涉及一种轻型卡车复合前翼板，解决了现有轻型载货汽车 前翼板消除发动机噪声效果很差的问题。
The utility model relates to a combined front wing for a light-duty truck, solving the problem that existing front wing for a light-duty truck is poor in effect to eliminate the noise of the engine.
选择了燃烧噪声的研究方法，对二甲醚发动机噪声的影响因素进行了试验研究和分析，明确了降低噪声的有效途径。
The influential factors of noise for dimethyl ether engine are studied and analyzed through experiments by using method of combustion noise and effective solutions for noise reduction are found out.
由于发动机噪声的频率成分比较复杂，如果采用主动降噪技术不能适时采集到源噪声信号，就达不到理想的降噪效果。
Because engine noise takes on complicated frequency characteristics, if original noise signal is not collected, the noise control effect will not be evident.
发动机噪声源的识别是控制发动机噪声的一项关键技术，传统的办法是用仪器分别测试噪声源，测试办法复杂，仪器多。
Identification of engine noise source is a critical technique of controlling engine noise. Traditionally, each of noise sources is separated to test. These tests are complicate by many instruments.
发动机噪声是汽车噪声源的主要部分，它是由多种声源发出的噪声组合而成的，主要包括空气动力噪声和机械噪声和燃烧噪声。
Engine noise is the greatest part of the vehicle noise, it consists of many kinds of noise especially gas kinetic noise, mechanical noise and combustion noise.
通过结构改进进行低噪声发动机设计，不仅可以在根源上控制发动机噪声，而且可以改善发动机的性能，还不会使发动机结构变得复杂。
Based on the structural improvement, it not only control the engine noise from root, but also can improve the engine performance without adding the complexity to the engine.
在文中阐述了空气动力噪声的特性及产生机理，得出降低空气动力噪声的一些结论，这对于降低汽车发动机噪声提供了有效的方法与思路。
The property of air power noise and mechanism was elaborated, some conclusions that reduce air power noise were drawn. An effective method and idea on reducing automobile engine noise was put forward.
他继续驾车前进，对发动机发出的噪声显然毫不在意。
He drove on, apparently unconcerned about the noise the engine was making.
将发动机置入机身上部也能够提高燃油效率和降低噪声。
Gains in fuel efficiency and noise reduction could also come from embedding the engines into the topside of the fuselage.
控制发动机的震动和其他噪声是个具有重要意义的挑战，亚当斯说。
Reining in the motor pulsations and other noise is a significant challenge, Adams said.
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.
此外，发动机位于后部上表面，提供了自然的噪声屏蔽，使得配置在起飞和着陆期间更安静。
In addition, the engines are located on the aft upper surface, providing natural noise shielding that makes the configuration quieter during takeoff and landing.
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.
对发动机表面辐射噪声控制的研究已受到越来越多的汽车生产企业的重视。
More and more automobile enterprises have attached important to research into the control of radiated noise from engine surface.
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.
由于共振式消声器具有结构简单、良好的消除低频噪声的性能和流动损失小等优点，因此在发动机进气噪声的控制中得到了广泛的应用。
Due to its inherent characteristics in reducing low frequency, small pressure loss and simple geometry, the resonant silencer is being extensively used in engine induction noise reduction.
由于共振式消声器具有结构简单、良好的消除低频噪声的性能和流动损失小等优点，因此在发动机进气噪声的控制中得到了广泛的应用。
Due to its inherent characteristics in reducing low frequency, small pressure loss and simple geometry, the resonant silencer is being extensively used in engine induction noise reduction.
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