Performance evaluation method of closed-loop system considering sensor degradation

Abstract

To improve the closed loop control system in the accuracy of the parts when degraded performance evaluation, this paper proposes a new performance evaluation method based on improved relative entropy index, first of all, the original asymmetric relative entropy distance measure improvement for symmetric distance measure, and then through the unbounded function mapping index improved to (0, 1) range of bounded indicators. In the Gaussian case, the index value can be calculated from the mean and variance of the data. Finally, the influence of sensor degradation in the control system on the performance of the control system is considered, and a simulation model including sensor degradation is established by Matlab/Simulink. The improved relative entropy index is used to evaluate the performance. Compared with the minimum variance index, this method can evaluate the performance of the control system flexibly and effectively when the sensor degradation.