N noise produced by the friction of the needle or stylus of a record player with the rotating record, caused by a static charge, dust, or irregularities on the surface of a record 针头在唱片上的摩擦声
Anisotropic degree of horizontal direction and vertical direction in the sea surface noise field are discussed.
论证了海面噪声场垂直与水平方向噪声的各向异性程度。
The results of this paper proved that it is effective to reduce the engine surface noise by changing the structure parameters.
结果证明，通过结构参数的改变来降低表面辐射噪声是行之有效的。
In this paper, the relationship between the structure vibration and the surface noise radiation is analyzed and deduced from the acoustic and vibrational theory.
本文从声学振动理论出发，分析并导出了结构的振动与表面辐射噪声的关系。
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