Question: Consider the simulation results for PID control in Figs. 8.15 and 8.16. Note that the u I response in Fig. 8.16 changes monotonically. Do you

Consider the simulation results for PID control in Figs. 8.15 and 8.16. Note that the u_Iresponse in Fig. 8.16 changes monotonically. Do you think this feature is typical of u_Iresponses for other PID controllers?

0.5 0.45 PID PI Open loop P-only 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 20 40 60 80 100 Time Figure 8.15 Closed-loop respon 0.4 0.2 -0.2 -0.4 и, и; -0.6 -0.8 -1 и -1.2 -1.4 -1.6 20 40 60 80 100 Time Figure 8.16 Manipulated variable u and its

0.5 0.45 PID PI Open loop P-only 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 20 40 60 80 100 Time Figure 8.15 Closed-loop responses for a unit step disturbance and a FOPTD model. 0.4 0.2 -0.2 -0.4 , ; -0.6 -0.8 -1 -1.2 -1.4 -1.6 20 40 60 80 100 Time Figure 8.16 Manipulated variable u and its individual components for the PID control system of Fig. 8.15.

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