基于无传感器检测方法的机械系统扭振试验研究

Torsional Vibration Test of Mechanical System Using Sensorless Detection Method

为了研究无传感器检测方法用于机械系统扭转振动检测的机理及效果,建立了一个由感应电动机驱动,以直流发电机为负载的轴系扭振模拟试验台。通过控制发电机负载回路的快速通断产生轴系扭转振动,利用Hilbert变换包络谱提取电流信号中的故障信息,并与电涡流位移传感器拾取的横向振动信号进行了比较。试验和分析结果表明,电机驱动设备的机械故障信息主要以扭转振动方式耦合到定子电流中,相对于横向振动检测,无传感器检测方法更适合机械系统的扭转振动故障检测与诊断。

In order to study the mechanism and the effect of the sensorless detection method for torsional vibrations of mechanical systems,a simulation test bench for shafting torsion vibration was set up,which was driven by an induction motor and was loaded by a DC generator. Through the rapid on-off of a computer-controlled load circuit,the shafting torsional vibration was generated. The fault information was extracted from the current signals using Hilbert transform envelope spectrum,and the fault information and the traverse vibration signal measured by an eddy current sensor were compared. The experimental results show that the mechanical fault information of the motor drive equipment mainly formed of torsional vibration is coupled to stator current. As compared with the traverse vibration detection,the sensorless detection method is more applicable to fault detection of torsional vibration of mechanical systems.