基于缸盖振动信号包络线相关分析的柴油机故障预警方法研究  

A diesel engine fault early warning method based on correlation analysis of the cylinder head vibration signal envelope line

作　　者：范正天 王磊 赵志超 夏敏 刘小波 茆志伟 FAN ZhengTian;WANG Lei;ZHAO ZhiChao;XIA Min;LIU XiaoBo;MAO ZhiWei(Beijing Key Laboratory of Health Monitoring Control and Fault Self-Recovery for High-end Machinery,College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,B6ijing 100029;Sinopec Chongqing Natural Gas Pipeline Co.Ltd.,Chongqing 408000,China)

机构地区：[1]北京化工大学机电工程学院高端机械装备健康监控与自愈化北京市重点实验室,北京100029 [2]中石化重庆天然气管道有限责任公司,重庆408000

出　　处：《北京化工大学学报（自然科学版）》2018年第4期76-81,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家重点研发计划(2016YFF0203305);中央高校基本科研业务费(JD1815)

摘　　要：针对柴油机故障特征易受到环境、载荷等因素的干扰,从而导致许多传统意义上的故障特征参数不再敏感的问题,提出了一种基于缸盖振动信号包络线相关分析的柴油机故障预警方法,对一台6缸柴油机的缸盖振动信号对比了希尔伯特变换和n阶极值插值两种方法的包络线提取效果,并对其包络线进行相关分析,得到了相似系数、距离标准差以及余弦相似度等相关分析结果。研究结果表明:在传统特征参数不敏感的情况下,相关分析可以更好地反映机组的故障状态。本文研究结果可为实现柴油机故障的早期预警奠定基础。The fault characteristics of diesel engines are easily affected by factors such as environment and load,resulting in many traditional fault feature parameters being no longer sensitive. In this work,a diesel engine fault warning method based on correlation analysis is proposed which focuses on the cylinder head vibration signal envelope line. Two different methods of extracting the vibration signal envelope lines of the cylinder head in a 6-cylinder diesel engine—Hilbert transform and n-order extremum interpolation—are compared. Based on the analysis of the envelope lines,the correlation coefficients,distance standard deviation and cosine similarity are obtained. The results show that the fault state of the diesel engine can be better illustrated by correlation analysis in the case when the traditional characteristic parameters are not sensitive. The correlation analysis thus lays a foundation for an early warning system for diesel engine faults.

关 键 词：柴油机 包络线 相关分析 故障预警 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]