Figure 6

(a)–(c) show the time responses of the error variables under control with (a) \(\eta _{1}^{1}=4\), \(\eta _{2}^{1}=1\), \(\eta _{3}^{1}=1\), \(\vartheta _{1}=3\), \(\eta _{1}^{2}=5\), \(\eta _{2}^{2}=1\), \(\eta _{3}^{2}=1\), \(\vartheta _{2}=4\), \(\theta =0.25\); (b) \(\eta _{1}^{1}=9\), \(\eta _{2}^{1}=1\), \(\eta _{3}^{1}=1\), \(\vartheta _{1}=3\), \(\eta _{1}^{2}=10\), \(\eta _{2}^{2}=1\), \(\eta _{3}^{2}=1\), \(\vartheta _{2}=4\), \(\theta =0.25\); (c) \(\eta _{1}^{1}=9\), \(\eta _{2}^{1}=1\), \(\eta _{3}^{1}=1\), \(\vartheta _{1}=8\), \(\eta _{1}^{2}=10\), \(\eta _{2}^{2}=1\), \(\eta _{3}^{2}=1\), \(\vartheta _{2}=9\), \(\theta =0.2\)