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内燃机学报
第 26 卷( 2008 ) 第 1 期 Vol. 26 ( 2008 ) No. 1
Tran saction s of CS ICE
文章编号: 1000 0909 (2008) 01 0087 05 26 013
发动机振动信号特征参数的多重分形研究
李国宾, 段树林, 于洪亮, 关德林
(大连海事大学轮机工程学院, 辽宁大连 116026)
摘要: 提出利用多重分形谱参数来表征发动机振动信号特征的新方法。运用多重分形理论对实测的发动机
缸体振动信号进行分析,计算了振动信号的多重分形谱参数,并探讨多重分形谱参数与发动机运行状态之间
的内在联系。结果表明:多重分形谱参数能定量刻画振动信号的特征。随着发动机工作状态的不同,信号的
多重分形2谱参2 数也发生变化。发2 动2 机振动越剧烈,多重分形谱参数越大,其能够反映发动机的真实运行状态,
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可以作为发动机状态监测和故障诊断的特征参量。
关键词: 多重分形; 谱参数; 发动机; 振动信号
中图分类号: TK411. 22 文献标志码: A
Study on Character istic Param eters of Eng ine V ibra tion
S igna l Ba sed on M ulti Fracta l
L I Guo b in, D UAN Shu lin, Y U Hong liang, GUAN D e lin
(Marine Engineering College, Dalian Maritime University, Dalian 116026, China)
Abstract: A method to characterize engine vibration signal characteristics was p roposed using multi frac
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tal spectrum parameters. The vibration signals p icked up from the engine cylinder body were analyzed by u
sing the multi fractal theory, and the multi fractal parameters of vibration signals under different operating
conditions were calculated. The relationship between the multi fractal parameters and the operating condi
tion was discussed. The study shows that the multi fractal spectrum parameters can be used to quantitative
ly describe the characteristics of the vibratio