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This work was supported by National Natural Science Foundation of China (Grant No. 61733017) and Nature Science Foundation of Fujian Province (Grant No. 2016J01317).
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Figure 1
(Color online) Frequency analysis of the feedback compensator of second-order LADRC. (a) Block diagram of second-order LADRC; (b) Bode plots of $C(s)$ and $C_{\rm~PID}(s)$, in which $K_c=2.5$, $\tau_I=1.777$, $\tau_D=0.4$.