Tune Control System at the Command Line
After specifying your tuning goals using
(see Tuning Goals), use
tune the parameters of your model.
systune command lets you designate one
or more design goals as hard goals. This designation gives you a
way to differentiate must-have goals from nice-to-have tuning goals.
to satisfy hard requirements by driving their associated cost functions
below 1. Subject to that constraint, the software comes as close as
possible to satisfying remaining (soft) requirements. For best results,
make sure you can obtain a reasonable design with all goals treated
as soft goals before attempting to enforce any goal as a hard constraint.
TuningGoal objects into a vector
of soft requirements and a vector of hard requirements. For example,
suppose you have created a tracking requirement, a rejection requirement,
and stability margin requirements at the plant inputs and outputs.
The following commands tune the control system represented by
treating the stability margins as hard goals, the tracking and rejection
requirements as soft goals. (
T0 is either a
slTuner interface previously configured for
SoftReqs = [Rtrack,Rreject]; HardReqs = [RmargIn,RmargOut]; [T,fSoft,gHard] = systune(T0,SoftReqs,HardReqs);
systune converts each tuning requirement
into a normalized scalar value, f for the soft
constraints and g for the hard constraints. The
command adjusts the tunable parameters of
minimize the f values, subject to the constraint
that each g < 1.
contain the final normalized values for each tuning goal in
systuneOptions to configure additional
options for the
systune algorithm, such as the
number of independent optimization runs, convergence tolerance, and
output display options.