EMD在柴油机燃烧不良诊断中的应用

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英文篇名：Application of EMD Method in Diagnose of Bad Combustion in Diesel Engine 中文刊名：现代车用动力 英文刊名：Modern Vehicle Power 作者：冀树德 ; 张晖 ; 贾桢 英文作者：JI Shu-de ; ZHANG Hui ; JIA Zhen(China North Engine Research Institute ; Datong 037036 ; China) 中文关键词：柴油机 ; 气缸 ; 振动 ; EMD ; 功率谱密度 ; IMF 英文关键词：diesel engine ; cylinder ; vibration ; EMD ; power spectral density ; IMF 出版日期：2007-11-15 机构：中国北方发动机研究所,中国北方发动机研究所,中国北方发动机研究所 山西大同037036,山西大同037036,山西大同037036 年：2007 期：04 出版单位：现代车用动力

摘要

介绍了经验模态分解(EMD)方法的基本原理和实现过程,并应用该方法对柴油机气缸盖上面采集到的非线性非稳态复杂信号进行了分解,获得了线性稳态的本征模函数(IMF)信号。每个本征模函数信号包含了比较单一的故障特征,对其进行功率谱密度分析最终找到了产生剧烈振动的激振源激振频率。分析、判断激振的频率可以知道产生剧烈振动的最终原因为燃烧不良。现场拆装发动机缸盖部分发现喷油孔严重烧损,验证了结论的正确性。
The elementary principle and realizing course of the empirical mode decomposition(EMD) method was introduced.The non-linear and unstable signal that was collected from the upper of cylinder head was decomposed and the intrinsic model function(IMF) signals were acquired.The intrinsic model function signals including rich fault characteristics were analyzed with the power spectral density method and the motivating frequency of the vibration source was acquired.It is also known that the reason of severe vibration is the bad combustion in the cylinder by analyzing the motivating frequency.It was found that the injection hole was seriously damaged after the engine was decomposed.This phenomenon verified the result.

引文

[1]胡劲松,杨世锡.基于HHT的旋转机械故障诊断方法的研究[J].动力工程,2004,24(06):845-851.
    [2]熊卫华,赵光宙.基于希尔伯特-黄变换的轴承振动特性分析[J].传感技术学报,2003,19(03):655-661.
    [3]公茂盛,谢礼立.HHT方法在地震工程中应用之初步探讨[J].世界地震工程,2003,19(03):39-43.
    [4]熊学军,郭炳火,胡筱敏,等.EMD方法和H ilbert谱分析法的应用与探讨[J].黄渤海海洋,2002,20(02):12-21.
    [5]盛兆顺,尹琦岭.设备状态监测与故障诊断技术及应用[M].北京:化学工业出版社,2003.