微弱信号的差分振子检测方法  

Method of Weak Signal Detection Based on Differential Oscillator

作　　者：胥永刚[1] 冯明时[1] 马海龙[1] 谢志聪[1] 

机构地区：[1]北京工业大学机电学院,北京100124

出　　处：《振动．测试与诊断》2013年第2期224-230,337,共7页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51075009);国家高技术研究发展计划("八六三"计划)资助项目(2009AA04Z417);北京市优秀人才培养计划资助项目(2011D005015000006)

摘　　要：在分析了差分振子基本原理的基础上,重点在理论上分析了噪声对差分振子输出相图的影响,推导了相图大小与有效信号幅值之间的线性比例关系,弥补了差分振子不能检测信号幅值的缺点,阐明了系统参数对差分振子检测性能的影响。理论分析、仿真实验及工程实践表明,该方法简单稳健,实时性好,具有良好的抗噪性能,能有效检测强噪声背景下的微弱故障信号,可实现机电设备早期故障的可视化检测。Based on the introduction of differential oscillator fundamental,the influence of noise on the oscillator phase diagram is analyzed emphatically,and the linear relationship between the phase diagram size and signal amplitude is derived to make up for the shortage that differential oscillator can't detect the signal amplitude,the setup principle of oscillator system parameter is also presented.The theoretical analysis,simulation test and engineering application show that this method is simple and robust,and has a good anti-noise property, the weak fault signals can be detected from the strong background noise,thereby providing a visual detection method for the incipient fault diagnosis of mechanical equipments.

关 键 词：差分振子 微弱信号检测 早期故障诊断 可视化检测 

分 类 号：TH17[机械工程—机械制造及自动化]