This paper presents a robust and efficient way of tuning PID controller using different variants of differential evolution (DE) algorithms for control of antenna positioning system and external disturbance mitigation. Quite a number of failure in complex control systems e.g. flights is attributed to external disturbance resulting from natural events, and sometimes from man oriented events. Hence controllers should not only be rated based on their ability to track the command input (target), but also in their ability to mitigate the effects of external disturbance. Five DE variants were implemented in this experiment, out of which DE/rand/2/JDE/bin appear to be optimal in addressing the problem, with maximum disturbance amplitude of 0.00073 which decayed rapidly to zero within 3 seconds, peak overshot of 0.0167, rise time of 0.04sec, and settling time of 0.08sec. This has an overall cost or objective fitness function of 0.034. The second optimal optimizer is DE/rand/1/bin with maximum disturbance amplitude of 0.00079.
Iliya et al. (Mon,) studied this question.
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