Fault Detection And Diagnosis Of Actuator In Control System

The Actuator, as the performance terminating parts of the control system, usually working under the formidable circumstance with high temperature, high pressure, and having corrosion etc, is easier to make faults. The actuator 's faults always make direct effect in the control performance; even make oscillation in the process, ultimately lead to the serious consequence as sub-quality products etc. So the demands of ensuring the control process operate stably and economically, is raising the performer itself reliability, finding the fault in the operation process in time. At first , the typical structure and the operation principle of an pneumatic actuator is introduced , the simulation model of the actuator is built and a set of faults of actuator and its damage to control process are described in the article. Two methods of fault diagnosis are presented, one bases on neural networks and fuzzy logic, the other bases on signal analysis. We put the fault diagnosis system into effect on the plant of SIS .Now, the system is put in use for the SIS system of PanShan Electric Power Plant and the effect is good.