基于非线性频率分析的主泵故障诊断技术研究

针对非线性系统的故障诊断问题,采用非线性频率特性分析的故障监测方法,对主冷却剂泵转子的开裂纹故障进行定位识别.该方法建立主泵开裂纹故障的数学模型后,使用两个幅值不同正弦信号激励系统,从非线性输出频率响应函数得到主泵振动信号的频率响应,通过计算系统频域的故障特征值,定位出了裂纹故障的位置.使用Matlab和Simulink的仿真工具验证了该方法的有效性,因此该方法可以应用于主泵裂纹故障诊断的研究之中.

Research on fault diagnosis for reactor coolant pump based on nonlinear output frequency response functions

The concept of nonlinear output frequency response functions was introduced to detect cracks in reactor coolant pump rotor using frequency domain information.Mathematical models of reactor coolant pump crackle failure are built in this method,and then using two sinusoidal excitation signals with different amplitude,frequency responses of vibration signals are got from nonlinear output frequency response functions,results of tests locate the failure position by calculating the failure eigenvalue of system frequency domain.Simulation indicated that this method performs well using Matlab program and Simulink toolbox;so that the method can be used for the detection of cracks fault diagnosis in reactor coolant pump.