It is difficult to study the contribution of each sound radiator to total cutting noise in a cutting system by means of traditional theoretical or experimental methods.

用传统的理论或实验方法研究切削过程中各个声辐射体对总体切削噪声的贡献比较困难和繁杂。

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In this paper, the sound field of a more general directional radiator in a stratified medium is treated, and the concept of directivity is applied to calculation of the normal modes.

本文讨论比较一般的指向性辐射器在分层介质中的声场，并将指向性概念应用于简正波计算。

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