Control System Actuator Risk Assessment Based on ITOPSIS Method

In order to improve the reliability of actuators and ensure the stable operation of control system, a hierarchical structure model of actuator faults of control system was established using AHP firstly; Then, the improved fuzzy analytic hierarchy process (IFAHP) was used to obtain the composite weight of evaluation criteria by the dynamic combination of subjective and objective weighting methods; Afterwards, the Improved Technique for Order Preference by Similarity to an Ideal Solution (ITOPSIS) was obtained by introducing grey correlation degree, and the final sequence of each failure mode was calculated. Finally, the numerical analysis of the pneumatic actuator in a gas turbine power plant was carried out. The results show that the evaluation results of the proposed method are basically consistent with the actual situation, and compared with the traditional TOPSIS method, it can deal with the uncertain factors in the evaluation process, reduce the subjective sensitivity, ensure the comprehensiveness of decision rules.