In Figs. 18.6 and 18.7, look at the different pairings of controllers. Which one has the larger stability region? How does this compare with the preferred pairing indicated by the RGA (is it the same or is it different)? Can you suggest a reason for the results (dynamic vs. steady-state effects)?.

2 2 4 6 3 5 Stable region Figure 18.6 Stability region for Example 18.2 with 1-1/2-2 controller pairing. 2. 3. Kel (15 Stable region 0.5 K2 Figure 18.7 Stability region for Example 18.2 with 1-2/2-1 controller pairing. AALLO