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。
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.
小指的是物理维度和其辐射的声波相比很小，或者其外形不会和该点声源指向性响应发生干扰。
"Small" means that the physical dimensions are small compared to the wavelength being radiated or that the shapes do not interfere with the polar response of the point source.
分析结果表明固定四角薄型平板的振动是不规则的，在远声场振动辐射是无指向性的。
The results indicate that the vibration of thin flat plane loudspeaker with four corners fixed is anomalistic and the vibration radiation at far sound field doesn't have any directionality.
铁路列车运行噪声的水平指向性是铁路列车噪声辐射的重要特性之一。
The horizontal direction of train running noise is a important character of train radiating noise.
本文通过实验模拟的方法研究了声波测并相控线阵声波辐射器的指向性测量方法。
The paper studied the measurement method for directivity of phased-array acoustic transmitter in acoustic log by experimental modeling method.
探究了裂纹长度、形状、位置对薄板振动频率和辐射声场指向性特征的影响规律。
The effect of the length, the shape, and the location of a crack on the vibration frequencies and the directivity patterns of the sound field radiated from the plate are investigated.
探究了裂纹长度、形状、位置对薄板振动频率和辐射声场指向性特征的影响规律。
The effect of the length, the shape, and the location of a crack on the vibration frequencies and the directivity patterns of the sound field radiated from the plate are investigated.
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