With a more aerodynamic shape and framed by a curved tail plane, these engines would make for a more streamlined aircraft, as well as directing most of their noise upward.
通过更加符合空气动力学的形状和一个曲线尾巴的飞机结构，这些发动机将使飞行更有效率，同时会将绝大部分的噪音传向空气上方。
The vibration force acting on the fluid directly comes into being the aerodynamic noise.
气动噪声是由直接作用在流体上的振动力产生。
Assuming that noise is unknown but bounded, set membership identification problem for flight vehicle aerodynamic parameters is studied in this paper.
在噪声未知但有界的情况下，本文研究了飞行器气动参数的集员辨识问题。
The noise at lower part of railway cars consists of rolling noise, aerodynamic noise and driving device noise.
铁道车辆下部噪声主要由滚动噪声、空气动力噪声和机器噪声组成。
The key point of reducing noise of paper machine is to reduce aerodynamic noise of vacuum couch.
降低真空伏辊空气动力性噪声是降低抄纸机噪声的关键。
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。
According to the aerodynamic noise analysis of cross flow fans, investigates the mechanism of reducing noise due to the adoption of non-isometric impellers.
根据对贯流风机气动噪声的分析，研究了采用不等距叶轮的降噪机理。
It is very important to reduce the aerodynamic drag and noise for traveling vehicles.
减低汽车行驶中的空气阻力、抑制其行驶时的气动噪声具有十分重要的意义。
In this paper, some schemes of reducing the aerodynamic noise are proposed for multi-blade centrifugal fans.
针对多翼离心风机气动噪声的主要噪声源提出降噪方案。
A wind tunnel test for a model of the automobile body shows that beneficial effects on reducing drag and suppressing aerodynamic noise by using internal acoustic excitation.
汽车车身模型风洞实验表明，用内部声激励可获得有效的减阻效果，而且还能起到抑制气动噪声的效果。
In addition, the pressure and velocity in cooling fan flow field are analyzed and the relations between flow rate, rotation speed, blade number and aerodynamic noise of cooling fan are studied.
同时，对风扇流场的压力和速度进行分析；研究了风扇流量、风扇转速、扇叶数和气动噪声相互之间的关系。
Proposes a theoretical model for aerodynamic noise transmitting towards interior cab of an automobile on the basis of the wind experiment.
在风洞实验的基础上，提出了气流噪声向汽车内部传播的理论模型。
The effect of protecting mesh of air conditioner outdoor unit on aerodynamic noise is studied with experimental method.
采用试验研究的方法，研究了某型空调器室外机组防护网对气动噪声的影响。
Chaos characteristics of the aerodynamic noise are discussed and the aeroacoustic noise signals on helicopter scissors tail rotor is analyzed by the chaos theory.
研究剪刀式尾桨气动噪声的混沌特性，并应用混沌理论进行了直升机尾桨气动噪声信号分析。
Described are the sound source detection method for the aerodynamic noise on Shinkansen rolling stock and relevant noise reduction measures.
介绍了新干线车辆空气动力噪声的声源探测方法及相应的降噪措施。
The aerodynamic noise strength of the centrifugal blower is bigger, and it is the main block in the centrifugal blower noise, and don't easy to control.
通风机空气动力噪声强度大是通风机噪声的主要部分，且不易控制。
With the constant increase of the trains' speed, the aerodynamic noise gradually succeeds the traditional track noise and becomes the main noise source of the high-speed trains.
随列车行驶速度逐年提高，气动噪声源逐渐超越轮轨噪声成为高速列车最主要噪声源。
The reason of influencing aerodynamic noise of air-conditioning outdoor unit was analyzed in detail, and solve the problem of reducing the noise of air-conditioning.
文章对低气压条件下气闸舱内换热过程的特点进行了理论分析，认为必须采取有效措施以解决气闸舱空气调节问题。
The reason of influencing aerodynamic noise of air-conditioning outdoor unit was analyzed in detail, and solve the problem of reducing the noise of air-conditioning.
文章对低气压条件下气闸舱内换热过程的特点进行了理论分析，认为必须采取有效措施以解决气闸舱空气调节问题。
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