normal working frequency meaning in English

正常工作频率

Then the difference between the output of the trained neural networks and that of the actual system is used as a residual , which detects the sensor fault . the diagnosis can then be performed by further exploiting the information provided from the residual signals according to certain rules introduced in detail in the thesis . simulating results show that the method can isolate any fault of the sensors in any input types and normal work frequencies
仿真结果表明，基于神经网络观测器的故障诊断方法在系统正常工作频率范围之内，不受系统输入类型和故障的类型的影响，只要故障对系统的特性发生影响(系统参数漂移3 ) ，通过神经网络观测器的残差判别函数可以诊断出故障。