第一部分介绍飞行器实测振动数据的平稳性、周期性和正态性检验的几种方法；
The first deals with several i methods used to test stationarity, periodicity and guassianity of the recorded data of aircraft vibration.
本文进一步研究了这些系数随时间变化而趋于一个定值或在某一常数附近作周期性振荡，并给出容易检验存在唯一全局渐近稳定的正周期解的条件。
In this article we further study the cases in which the coefficients of the model vary with time and tend to definite values or vibrate periodically near certain constants and...
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