第39卷(2017)第2期智能化与控制
柴油机 Diesel Engine
Vol. 39(2017) No. 2
基于HHT的柴油机气阀漏气振动诊断方法研究
郑毅"，杨建国"2
（1.武汉理工大学能源与动力工程学院，湖北武汉430063； 2.船舶动力工程技术交通行业重点实验室，湖北武汉430063）
摘要：介绍了采用Hilbert-HuangTransform（HHT）信号分析方法提取柴油机缸盖振动信号中气阀漏气特征的试验研究。通过气阀漏气的故障模拟试验，测量了柴油机气阀不同状态下的缸盖振动信号，分析确定了缸益振动信号的分析段；运用HHT分析方法提取了气阀漏气时频域故障特征参数。研究发现：当气阀处于正常状态时其振动信号能量主要集中于上止点附近；当气阀处于漏气状态时能量向压缩冲程转移，分布更为均匀。表明：表征能量分布均匀程度的时频可以作为气阀漏气故障特征参数。
关键词：柴油机；Hilbert-Huang变换；气阅；漏气；振动信号
中图分类号：TK423.4*3；TK428
文献标识码：A...文章编号：1001-4357(2017)02=0024.-04
Study of Vibration Diagnostic Method of Valve Leakage
BasedonHHTMethodforDieselEngine
Zheng Yi'，Yang Jianguo'-2
(1. School of Energy and Power Engineering, Wuhan University of Technology, Hubei Wuhan 430063 ; 2. Key Laboratory of Marine Power Engineering and Technology Granted by MOT, Hubei Wuhan 430063)
Abstract: Using Hilbert-Huang Transform (HHT) analysis method, the experimental research on ex+ tracting the characteristics of valve leakage from the vibration signals of a diesel engines cylinder head is present. The valve leakage faults were simulated, the vibration signals on the cylinder head in the differ-ent valve conditions were measured, the analysis sections of the vibration signals were identified, and the characteristic parameters of the valve leakage faults were extracted by using HHT analysis method in fre-quency domain. It is found that when the valves are in good condition, the vibration signal energies are concentrated in the vicinity of the top dead center (TDC) ; while in the leakage condition, the vibration signal energies are transferred to the compression stroke and the energy distribution is more equal. It is also found that the time-frequency entropy which characterizes the uniformity of the vibration energy dis-
tribution can be treated as the characteristic parameters to diagnose the fault of valve leakage. Key words: diesel engine; Hilbert Huang transform; valve; leakage; vibration signal
0引言
柴油机气阀机构的工作条件恶劣，气阀头部直接承受高温高压气体的作用；且气阀落座频繁，冲收稿日期：2016-08-29
基金项目：国家自然科学基金项目（51379169）。
击力大，极易发生漏气故障。气阀漏气使柴油机燃烧室的密封性遭到破坏，影响柴油机的换气过程，导致燃烧恶化，降低其整体性能，且存在着很大的安全隐患]。因此，开展气阀漏气的监测与诊断
作者简介：郑毅（1992-），男，硕士研究生，主要研究方向为柴油机监测、诊断与电子控制，E-mail；zhengxiaoyi623@sina