局域波时频相干方法及其工程应用  

Local Wave Time-Frequency Coherence Method and Its Engineering Application

作　　者：赵俊龙[1] 王奉涛[2] 李宏坤[2] 韩素兰[1] 

机构地区：[1]华北水利水电学院机械学院,郑州450011 [2]大连理工大学机械学院,大连116023

出　　处：《振动．测试与诊断》2012年第4期624-628,691,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(编号:50805014);教育部科学技术研究重点资助项目(编号:109047)

摘　　要：由于在工程现场采集到的振动信号一般为多个激励源所引起的振动响应的叠加,有效源信号往往被淹没在其他信号的干扰之中。对信号相似性评价标准进行研究,在此基础上提出局域波时频相干算法,将其应用于往复式压缩机缸体的故障诊断中。首先,双通道同步采集往复式压缩机气阀及缸体信号;其次,应用循环互相关方法消除气阀信号与缸体信号中气阀成分之间的时延;最后,应用局域波时频相干方法去除缸体信号中的气阀干扰成分。工程应用表明,该方法可以将气阀干扰信号从复合信号中剔除,实现往复式压缩机缸体及其内部部件的准确监测与诊断。Based on the research of signal similarity evaluation criterions, Local Wave time-frequency coherence method is proposed, and is further applied in the fault diagnosis of reciprocating compressor cylinder. Firstly, double channel signals of cylinder and valve are synchronously sampled. Secondly, cyclic cross-correlation function is used to eliminate the time delay between these signals. Finally, Local Wave time-frequency coherence method is utilized to remove the interference components from cylinder signal. Thus, more concise and precise working condition information for cylinder and inner components can be obtained.

关 键 词：时频分析 相干 故障诊断 局域波 往复式压缩机 

分 类 号：TP206.3[自动化与计算机技术—检测技术与自动化装置] TH458[自动化与计算机技术—控制科学与工程]