基于连续小波变换的振动故障分析方法研究  

Research on vibration fault analysis based on continuous wavelet transform

作　　者：唐凯[1] 苏越[1] 

机构地区：[1]中国飞行试验研究院,西安710089

出　　处：《国外电子测量技术》2011年第6期18-20,共3页Foreign Electronic Measurement Technology

摘　　要：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,小波变换可用来分析振动故障。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.

关 键 词：振动故障分析 小波变换 MORLET小波 

分 类 号：V217[航空宇航科学与技术—航空宇航推进理论与工程]