本文将飞机在飞行过程中发出声辐射的动态问题,按准稳态方法分解为航迹,观察点与声源的几何关系,声源特性、大气衰减与地面效应等单元过程。并以涡扇飞机和螺旋桨飞机等计算实例,阐明飞机噪声的组成,时间历程、频谱,指向性及地面等值线等同公共噪声和声疲劳有密切关系的问题。 In this paper, the dynamic issue of sound radiation emitted by the aircraft during flight is decomposed into trajectories according to the quasi-steady state method, and the geometric process of the sound source, sound source characteristics, atmospheric attenuation and ground effect are observed. The examples of turbofan and propeller aircraft are also given to illustrate the issues that the composition, time history, spectrum, directivity and ground contour of aircraft noise are closely related to public noise and acoustic fatigue.