基于CHI-LMD方法的转子振动信号分析  

Rotor vibration signal analysis based on the CHI-LMD method

作　　者：邓林峰[1,2] 赵荣珍[1,2] 

机构地区：[1]兰州理工大学机电工程学院,兰州730050 [2]兰州理工大学数字制造技术与应用省部共建教育部重点实验室,兰州730050

出　　处：《振动与冲击》2014年第15期58-64,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(50875118;51165019);兰州理工大学优秀博士学位论文培育计划资助项目(201102)

摘　　要：为解决三次样条插值(Cubic Spline Interpolation)局部均值分解(Local Mean Decomposition)(CSI-LMD)方法的分解精度及计算效率偏低问题,提出了一种利用三次Hermite插值(Cubic Hermite Interpolation,CHI)和正交性准则(Orthogonality Criterion,OC)对CSI-LMD进行改进的新方法。该方法首先以三次Hermite插值代替三次样条插值,求解信号的上/下包络线及均值曲线;其次,用OC判据作为分解过程中乘积函数(Product function,PF)迭代结束的判断条件;最后,与LMD方法的其他步骤相结合,形成了一种新的CHI-LMD方法。仿真和实验结果表明,CHI-LMD方法在分解精度、时间消耗、PF分量的正交性以及分离故障转子的特征振动成分等方面,比CSI-LMD方法更具优势。To solve the problem that the accuracy and efficiency of the cubic spline interpolation-based local mean decomposition（ CSI-LMD） method are relatively low,an improved LMD approach based on cubic Hermite interpolation（ CHI） and orthogonality criterion（ OC） was proposed here. Firstly,the cubic spline interpolation was replaced with the cubic Hermite interpolation. Furthermore,the orthogonality criterion was employed to determine the iteration procedures of deriving each product function. Finally,a novel CHI-LMD algorithm was developed by integrating other procedures of the original LMD. The simulation and experimental results showed that the proposed method performs much better than the CSI-LMD method does in several aspects including decomposition accuracy,time consumption and so on.

关 键 词：局部均值分解 三次样条插值 三次Hermite插值 正交性准则 振动信号分析 

分 类 号：TN911.7[电子电信—通信与信息系统] TH17[电子电信—信息与通信工程]