周期和冲击混合特征信号的自适应波形分解  

Adaptive Waveform Decomposition of Signal with Periodic and Impulse Response Features

作　　者：孟庆丰[1] 费晓琪[1] 焦李成[2] 何正嘉[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]西安电子科技大学电子工程学院

出　　处：《西安交通大学学报》2003年第3期237-240,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目 (5 0 0 75 0 67);国家高技术研究发展计划专项经费资助项目 (2 0 0 1AA413330 )

摘　　要：导出了一种适合于分解机械动态信号的基元函数 ,它与提出的自适应信号分解方法相结合 ,能够将机械动态信号分解为正弦波和冲击响应的线性展开 ,因此不仅可以从信号中提取平稳的周期波形 ,而且还可以提取非平稳的冲击响应波形 ,特别是当信号中同时含有 2种特征波形时 ,可以将其分别提取出来 .转子冲击实验结果也证实了所推导的基元函数的有效性 ,并与Gabor基元函数进行了比较 。An elementary function that is suitable to decompose mechanical dynamic signal is derivecd firstly, then a method of adaptive signal representation for the signal decomposition with the elementary function is proposed. The elementary function, combined with the signal decomposition method, can be used to decompose mechanical dynamic signal into a linear expansion of sinusoidal and impulse response waveforms. Therefore, both the periodic and the impulse response components can be simultaneously extracted from the signal. Impulse experiment on a bearing rotor test rig shows that it is more effective to use the derived elementary function than the well known Gabor function for extracting the mechanical impulse response.

关 键 词：自适应波形分解 信号分解 自适应信号表示 冲击响应 周期信号 机械信号 故障诊断 

分 类 号：TH17[机械工程—机械制造及自动化] TN911.7[电子电信—通信与信息系统]