Process Control: Modeling, Design, and Simulation

Student Exercises

1:	Consider Example 14.2, the quadruple tank problem. Find the RGA for each operating point. Which variable pairing do you recommend for each operating point? Consider the nonminimum-phase (RHP transmission zeros) operating point (operating point 2) in Example 14.2. Design independent single-loop controllers for relatively fast closed-loop responses. (Hint: Approximate the transfer functions as first order and use PI tuning rules.) Then close both loops simultaneously using the independent SISO tuning. What do you find? How much detuning is necessary to obtain good performance with both loops closed?
2:	Find the inverse of the process transfer function matrix for system B in Example 14.1.
3:	Consider the mixing tank presented in ...