摘要
小波变换具有优良的时频分析特性,利用小波变换提取周期信号中的微弱瞬态冲击非常有效。为了消除MALLAT算法中的频率混淆,本文提出了一种改进的二进离散小波变换快速算法,并成功地利用小波变换提取了某型涡喷发动机滚珠轴承的早期故障特征,实现了傅立叶变换所达不到的效果。
Wavelet transformation has very good characteristics of time-frequency analysis,and is very effective to extract the small instantaneous shock from harmonic signal.An improved fast algorithm is proposed to avoid frequency aliasing,which exists in the Mallat algorithm.The incipient fault character of the bearing in one aeroengine is extracted successfully by the wavelet transformations.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
1999年第4期343-347,共5页
Journal of Aerospace Power
基金
航天工业总公司九五科技攻关资助