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。

So a direct method to reduce the engine noise is to insulate the exterior radiation noise.

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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。

An experimental study on the engine noise source identification by the method of surface vibration measurement technique is carried out in this paper.

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此外，发动机位于后部上表面，提供了自然的噪声屏蔽，使得配置在起飞和着陆期间更安静。

In addition, the engines are located on the aft upper surface, providing natural noise shielding that makes the configuration quieter during takeoff and landing.

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