基于证据理论的振动发散故障监测方法

Monitoring Method of Vibration Divergence Fault Based on Evidence Theory

针对振动系统中振动迅速发散的故障,设计了基于证据理论的融合监测方法。对用于测量振动信号的多源传感器分别采用传感器数据方差、方差前向差分作商和方差前向作商作为描述状态的特征参数,计算基本概率分配函数,并根据Dempster组合规则进行融合。在隔振系统物理实验平台上实现了融合诊断监测过程,对采用3种特征参数的故障监测效果加以验证、比较和分析。实验结果表明,振动系统中传感器数据方差前向作商适合作为特征参数,由此构建的融合方法能够对振动发散故障实施有效诊断,并可以实现实时监测。

A fault fusion monitoring method based on evidence theory is designed for the vibration divergence fault in vibration systems.Multisensors are used to mesure the vibration signals.The variance of the multisource datas,quotient of forward difference of the variances and forward quotient of the variances are chosen as the state characteristic parameters respectively,then basic probability assignment functions are calculated.They are fused according to the dempster combination rule.The fusion diagnosing and monitoring process is realized on the hardware experiment platform of the vibration isolator.Monitoring effects using each state characteristic parameter are validated,compared and analyeed.The results show that forward quotient of variance is suitable for the state characteristic parameter.The fusion method based on this can diagnosis the vibration divergence fault effectively and achieve real-time monitoring.