MATLAB Dynamics & Control Assignment Example | Topics and Well Written Essays - 4500 words

MATLAB Dynamics & Control - Assignment Example Furthermore, both the time constant and dead time vary with the size of the step-change. The process gain is affected but it is affected only in half of the cases (see Concentration A, see below). †¢ Select a set of dynamic process constants resulting from one of the step-changes that you have tested, and use these to calculate initial values for the constants in each of the three different controller equations (P, PI & PID). Proportional control: It is simple, provides rapid adjustment of the manipulated variable (MV). Does not provide zero offset, although the error is reduced (E>0). It increase speeds in the dynamic response. It can cause instability if improperly tuned. Integral control: It is simple, achieves zero offset (E=0). It provides adjusts the manipulated variable (MV) in a slower manner than the proportional mode –this can lead to poor dynamic performance. It can cause instability if improperly tuned. Derivative control: It is simple. It does not influence the final steady-state value of the error (E). It provides rapid correction based on the rate of change of the controlled variable (CV). It can cause undesirable high-frequency variation in the manipulated variable (MV). †¢ Once you have chosen your optimal control scheme, justify why you have selected it. You can use various methods of assessing controller performance in order to reach your decision: rise time, peak overshoot ratio, decay ratio, settling time, IAE, ISE, ITAE. You are not expected to use all of these, but at least two should be used and compared with each other in relation to optimizing your controller constants. †¢ Test your control loop for its ability to cope with a disturbance (e.g. in the concentration of feed chemical, or the temperature of the cooling water), and also for its ability to move the process to a new operating region by making a step-change to the set-point (i.e.