A calculation method for geometrical spreading loss is provided which is adapted to the characteristics of running trains noise.
给出适合铁路列车运行噪声特点的几何发散损失计算方法。
It recommends that the calculation of geometrical spreading loss of running trains noise adopt the theories calculation formula or the simplified formula of directional characteristic of dipole.
推荐铁路列车运行噪声几何发散损失计算采用偶极子指向性特性的理论计算公式或简化公式。
Based on the theory of acoustics, this paper analyzes the character of geometrical spreading loss of finite line sound source on three types of directivity-monopole, intermediate pole and dipole.
根据基本声学理论，分析具有单极子、中间和偶极子三种指向性的有限长线声源的几何发散损失特性。
The loss of energy from a wavefront as a consequence of geometrical spreading, observable as a decrease in wave amplitude.
由于球面波的几何扩展产生的波前能量的损失，这种扩散作用可从波的振幅降低方面观测到。
The loss of energy from a wavefront as a consequence of geometrical spreading, observable as a decrease in wave amplitude.
由于球面波的几何扩展产生的波前能量的损失，这种扩散作用可从波的振幅降低方面观测到。
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