对空气中的直升机噪声进行了分析。
没有任何声音，除了广播和直升机的噪声。
No sound whatsoever, but the noise of the radio and the helicopter.
现在，相反的，自由世界的最伟大国家拥有的这个领导者已经整整八年了，他假装听不到我们比直升机的噪声还大的审问。
Now, in contrast, the greatest nation of the free world has had a leader for eight straight years that has pretended that he can not hear our questions over the noise of the helicopters.
现代武装直升机的超低空飞行，使得雷达系统已经无能为力，因此通过直升机的飞行噪声对其进行识别和定位具有重要意义。
That modern armed helicopter flies at super low space makes radar system useless, so it is important to identify and locate a helicopter through its flying noise.
对实测的直升机辐射噪声数据进行了分析，获得了目标辐射噪声谱特性。
By the analysis of the noise data radiated by a helicopter, the noise characteristics of low altitude targets are presented.
旋翼桨-涡干扰噪声问题是直升机气动声学领域的一个研究热点和难点。
The research on the rotor blade-vortex interaction (BVI) noise is a very important aspect and a very challenging subject in the rotorcraft aeroacoustics field.
本文最后数值模拟直升机悬停旋翼的气动噪声，为直升机降噪研究打下一定的基础。
In the end, this paper calculates the noise of hovering rotors that is basic researching work for helicopter noise reduction.
本文最后数值模拟直升机悬停旋翼的气动噪声，为直升机降噪研究打下一定的基础。
In the end, this paper calculates the noise of hovering rotors that is basic researching work for helicopter noise reduction.
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