基于混沌理论和相关向量机的自动机故障诊断

摘要

Aiming at the nonlinear and short time impact characteristics of automaton vibration signal, a method that based on the combination of chaos theory and relevance vector machine (RVM) was proposed. Firstly, the characteristic matrix of the four chaotic parameters of the vibration signal of automatic mechanism was calculated for stating the automaton state information. Finally, the characteristic matrix was put into RVM to recognize different fault types. The experiment results of automatic mechanism show that the representation of the running state information can be realized by extracting four chaotic parameters of the vibration signal of the automatic machine, and RVM can classify usual fault types of automatic mechanism exactly. In addition by comparing with the diagnostic results of SVM,the advantage of RVM is verified.%针对自动机振动信号的非线性与短时冲击特性,提出一种基于混沌理论和相关向量机(relevance vector machine,RVM)相结合的自动机故障诊断方法.首先,计算每一组自动机振动信号的最大Lyapunov指数﹑关联维数﹑Kolmogorov熵和相对关联距离熵共4个混沌参数并组成特征矩阵,从而表征自动机状态信息.然后,将特征矩阵输入RVM中进行分类识别,判断故障类型.自动机故障诊断实例表明,通过提取自动机振动信号的4个混沌参数可以实现其运行状态信息表征,并且RVM能够较精确地识别自动机的常见故障;此外,通过与支持向量机(support vector machine,SVM)的故障诊断结果进行对比,验证RVM分类模型的优势.