Ways to reduce engine noise for small-wheeled tractors have been indicated.
为小四轮拖拉机发动机的降噪指明了方向。
Synthesised engine noises could even help reduce noise pollution, says Mr Peachey.
皮奇先生说，人工合成的发动机声音甚至有助于减少噪音污染。
So a direct method to reduce the engine noise is to insulate the exterior radiation noise.
因此对发动机进行降噪一个直接的方法就是对表面噪声进行屏蔽。
I wanted to listen, see if I could hear any type of engine noise. I could not hear anything.
我想听听，看看我是否能听到任何类型的引擎噪音。我什么也听不到。
"Passengers will hear hardly any engine noise," Krein says, "and the same goes for people on the ground."
“乘客将几乎听不到任何发动机的噪音，”Krein说，“地上的人们同样收益。”
They even pipe in engine noise and vibrate the seats to replicate a truly unpleasant airplane dining experience.
他们还往机舱内输入机器噪声，震动座椅，惟妙惟肖地复制出令人不快的飞机就餐体验。
Engine noise is the major noise source of automobile; air power noise is one of composition parts of engine 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。
To tackle engine noise, Perkins does things like balancing internal loads to the pump to optimize the overall design.
为了解决发动机噪音，珀金斯并不像内部负载平衡的泵优化的整体设计。
The new Type 62-1 model had air conditioning, a larger fresh water tank, stabilizer fins, and much reduced engine noise.
新的62-1型有了空调，较大的淡水箱，稳定鳍和大量减少了发动机噪音。
We measure the bare engine noise, then rank which particular areas of the engine are producing the highest levels of noise.
我们衡量裸发动机噪音，然后排名特定地区的发动机生产最高水平的噪音。
Because the hydraulic valve plunger automatic control valve clearance is zero gap, simultaneously may reduce the engine noise.
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。
The outstanding repair features in a significant reduction in engine noise, vibration, wear and tear, and the number of maintenance;
超凡的修复功能显著降低发动机工作噪音、减少震动，修复磨损，减少维修次数；
As the bypass ratio of turbofan engine is more and more high, fan noise is a more important part to the overall turbofan engine noise.
随着飞机广泛使用的涡轮风扇发动机涵道比的不断提高，风扇噪声在飞机总噪声中占有越来越突出的地位。
Advantages: up to 20 % lower emissions or up to 5 % more power or up to 3 % lower fuel consumption or up to 3 dB (a) less engine noise.
优点：高达20 %，低排放或高达5 %以上的权力或可高达3 %，降低燃料消耗或高达3分贝(a)以下发动机的噪音。
To minimize wind, road and engine noise , there's a lot of sound insulation located under the hood and floor, and in the doors and dash panel.
为了将风噪，道路和引擎噪音减到最少，乐骋在车顶夹层和地板之下及车门和仪表板里，嵌镶上许多的隔音绝缘填充物。
An experimental study on the engine noise source identification by the method of surface vibration measurement technique is carried out in this paper.
通过测量柴油机表面振动速度的方法对其进行了表面噪声源识别的研究。
Applying the order bi-spectrum in the analysis of engine noise signals shows that it can extract the fault characteristics and realize the state monitoring.
运用此方法对内燃机主轴承不同间隙下的噪声信号进行分析，结果表明，此方法能有效地提取故障的特征，实现状态监测。
Because engine noise takes on complicated frequency characteristics, if original noise signal is not collected, the noise control effect will not be evident.
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。
Vehicles can start a smooth, shift easily, and significantly reduce engine noise and vibration, effectively improve the performance of the engine and gearbox.
可使车辆起步平稳、换挡轻松，并极大降低发动机噪音和震动，有效提高发动机和变速箱性能。
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.
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。
The two choices of new engine could yield fuel savings of 15% (airlines consider anything above 2% to be meaningful), and will reduce carbon emissions and engine noise.
新引擎的两种选择可以节油15%(航空公司认为节油率超过2%才有意义)，并减少碳排放以及引擎噪音。
The paper reports the results of an investigation of the characteristic of combustion pressure oscillation in a D. I. diesel engine and their effect on engine noise.
本文报告了对直喷式柴油机燃烧压力振荡特性及压力振荡对燃烧噪声影响规律的研究。
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.
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。
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.
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 correlation dimension analysis of noise signals of internal combustion engine, it was proved that engine noise signals have an obvious fractal characteristic.
通过对实际测量的内燃机噪声信号的关联维数计算分析，证明了内燃机噪声信号的分形特性。
The experiment of sound radiation efficiency and engine noise test were carried out when the engine was equipped with thin-wall components with free and compound damping.
采用表面振动法进行了柴油机表面辐射噪声的诊断，并对附加自由和复合阻尼的薄壁件进行了声辐射效率试验研究和整机试验。
Using acoustical holography, some interesting results are shown about the different noises of a high speed vehicle, such as engine noise, tire noise and aerodynamic noise.
它能够用来分析汽车在高速运动过程中发动机的噪声、轮胎噪声和空气动力学噪声。
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.
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.
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。
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