柴油发动机曲轴轴承振动信号的双谱分析  

Bispectrum Analysis for Vibration Data of Crankshaft Bearing in Diesel Engine

作　　者：赵慧敏[1,2] 夏超英[2] 肖云魁[3] 李会梁[4] 夏天[5] 

机构地区：[1]天津大学电气与自动化工程学院 [2]军事交通学院基础部 [3]军事交通学院汽车工程系 [4]成都军区78528部队 [5]解放军理工大学工程兵工程学院

出　　处：《振动．测试与诊断》2009年第1期14-18,共5页Journal of Vibration,Measurement & Diagnosis

基　　金：国家部委预研基金资助项目(编号:40407030302)

摘　　要：为提取柴油发动机曲轴轴承振动信号的故障特征,采用双谱的分析方法,提出了用双谱特征频率面来描述信号特征。通过用双谱分析曲轴轴承振动信号,在双谱模域内进行搜索,得到了信号的特征频率面。结果表明,信号采集的最佳部位为曲轴左右两侧机体,最佳转速为1800r/min以上,对角线以外的区域包含了大量的故障特征。双谱能消除发动机振动信号中的噪声,有效提取出曲轴轴承振动特征信号。For the sake of extracting the fault characters of crankshaft bearing of diesel engine,the method of bispectral analysis was adopted.Bispectral characteristic plane in frequency field was brought forward to characterize the data.By bispectral analyzing of the vibration data and searching the field of bispectral modulus,characteristic planes in data were found out.The result shows that the best places for data collection are the both sides of engine where the crankshaft is located.The best rotational speed of engine is above 1 800 r/min.The area besides the diagonal contains many fault characteristics.The noise can be reduced and characteristics in vibration data of the crankshaft bearing can be extracted efficiently by the method of bispectral analysis.

关 键 词：双谱 柴油发动机 曲轴轴承 故障诊断 

分 类 号：TH165.3[机械工程—机械制造及自动化]