Road traffic noise reducing devices. test method for determining the acoustic performance. part 3 : normalized traffic noise spectrum.
道路交通噪音减弱装置。声性能测试方法。第3部分：正常交通噪音范围。
After a white noise signal has been taken as the input of a standard sound source, a static acoustic test is conducted for a prototype silencer without air flow and at the normal temperature.
采用白噪声信号作为标准声源的输入信号，在常温无气流条件下对消声器实物模型进行了静态放声试验。
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。
Experiments on the test pool and open sea have proved that this simulator could not only transmit acoustic signals like CW and LFM, but also generate ship radiated noise with specific characteristics.
通过水池联调和海上实测验证，表明：模拟器除了能够发射CW、LFM等常用的水声信号外，还能够模拟产生具有特定特征的舰船辐射噪声。
The diesel engine's noise is measured by using the acoustic pressure method. It separates successfully the engine's combustion noise, mechanical noise and inlet noise in test.
采用声压测量法对柴油机进行了整机噪声的测量，通过试验研究成功分离了发动机的燃烧噪声、机械噪声及进气噪声。
The diesel engine's noise is measured by using the acoustic pressure method. It separates successfully the engine's combustion noise, mechanical noise and inlet noise in test.
采用声压测量法对柴油机进行了整机噪声的测量，通过试验研究成功分离了发动机的燃烧噪声、机械噪声及进气噪声。
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