基于连续小波变换的振动故障分析方法研究

某型机在进行调整试飞时驾驶舱振动过大,此类机振动故障信号一般具有非平稳特征,传统傅里叶分析无法得到频谱随时间变化的趋势.小波变换具有良好的时频局部特性,能够反映信号在局部范围内的特征.在介绍小波变换理论的基础上,采用基于Morlet小波的连续小波变换对飞机振动故障数据进行了分析,得到频率随时间变化的趋势.结果表明,小波...

Research on vibration fault analysis based on continuous wavelet transform

During the adjustment of certain aircraft,cockpit vibrates excessively.This vibration fault signal has non-stationary characteristics,and the traditional fourier analysis can not be used to get the trend of the spectrum over time.While the wavelet transform has good time-frequency localization characteristics of the signal that can reflect the characteristics of the local area.The wavelet transform theory is introduced,and continuous wavelet transform based on Morlet wavelet is used to analysis the aircraft vibration fault,then get the trend of the spectrum over time.The result shows that the wavelet can be used to analysis vibration fault.