STFT在航空发动机振动信号处理中的应用

摘要

While the aero-engines are operating in non-steady state, the conventional spectral analysis and power spectral analysis methods can not reflect the changes of spectrum correctly. Short time Fourier transform ( STFT) is one of the most popular time-frequency analysis technologies which is wildly used in the field of engineering applications. According to its clear physical concept, simple mathematical algorithm and the fact of being used wildly, STFT is used to resolve non-steady vibration signal processing problem in the domain of aircraft engines, which is discussed deeply. All the research work about STFT application, especially the directed applied algorithm, is very close to the real requirement.%当航空发动机工作于非平稳状态时,常规频谱分析和功率谱分析方法不能反映振动数据频谱随时间的变化情况.短时傅里叶变换(STFT)技术作为最为常用的时频分析技术之一,在工程应用领域具有算法简单、物理概念明确等优点,被广泛采用.鉴于STFT技术的上述优点,从航空发动机非平稳状态整机振动数据处理应用需求出发,对如何将短时傅里叶变换技术应用于航空发动机非平稳状态整机振动信号进行了分析研究,并给出了针对性的实现算法.