The first process is a simple lag only response. It is not possible to tune this using the open loop method. This is followed by the same lag only but this time with added noise to see what the effect is. Finally in this set of three there is a delay only response.
The second set of experiments are two inverse response processes. The first is two lags in parallel followed by a lag and delay in parallel.
The aim is to go through these one by one and try to decide on the controller parameters which returns the response to it's setpoint value of zero with the minimal of disturbance.
It would also be worthwhile to work through the Introduction to Zeigler Nichols Tuning Methods or at least look at the notes from it if you have not already done so.
Then it is possible to choose a process. As mentioned before there are 5 to choose from ranging in difficulty from an ideal lag only through to the more difficult inverse response.
Once you have chosen a process it is necessary to analyse it with proportional only control and hence find the optimal controller parameters
Go To Pre-Experimental Questions