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。

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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。

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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。

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The engineers have done a beautiful job with wind and tire noise, opting for big acoustic blankets in the wheel wells, which quelled the roar coming from our test car's 19-inch summer tires.

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