- Gain margin (db)
Specify the desired gain margin in decibels. For MIMO control system, the gain
margin is the multiloop disk margin. For information about multiloop disk margins, see
“Stability Analysis Using Disk Margins” (Robust Control Toolbox).- Phase margin (degrees)
Specify the desired phase margin in degrees. For MIMO control system, the phase
margin is the multiloop disk margin. For information about multiloop disk margins, see
“Stability Analysis Using Disk Margins” (Robust Control Toolbox).- Keep poles inside the following region
Specify minimum decay rate and maximum natural frequency for the closed-loop poles
of the tuned system. While the other Quick Loop Tuning options specify characteristics
of the open-loop response, these specifications apply to the closed-loop dynamics.The minimum decay rate you enter constrains the closed-loop pole locations to:- Re(s) < -mindecay, for continuous-time systems.
- log(|z|) < -mindecay*Ts, for discrete-time systems with sample time Ts.
The maximum frequency you enter constrains the closed-loop poles to satisfy |s|
< maxfreq for continuous time, or |log(z)| < maxfreq*Ts for discrete-time
systems with sample time Ts. This constraint prevents fast dynamics in the closed-loop
system.Options
Use this section of the dialog box to specify additional characteristics.- Apply goal to
Use this option when tuning multiple models at once, such as an array of models
obtained by linearizing a Simulink model at different operating points or block-
parameter values. By default, active tuning goals are enforced for all models. To
enforce a tuning requirement for a subset of models in an array, select Only Models.
Then, enter the array indices of the models for which the goal is enforced. For
example, suppose you want to apply the tuning goal to the second, third, and fourth
models in a model array. To restrict enforcement of the requirement, enter 2:4 in the
Only Models text box.10 Control System Tuning