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.
单位根检验是计量经济学中检验时间序列数据平稳性的最重要工具，而协整检验则是用来判断非平稳变量之间是否存在长期均衡关系的常用方法。
As an important tool of testing time series stationarity, unit root test is always used, and cointegration test is also often implied for judging long equilibrium between nonstationary variables.
由于结构突变的存在会影响数据平稳性的检验结果，导致在进行协整分析时得出错误的结论。
Since the existence of structural shifts would bias the result of stationary test, which could lead to mendacious result in cointegration analysis and misleading conclusions.
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