bounds on the smallest singular value of the open-loop response. Gain profile values less
than one are interpreted as minimum roll-off requirements, which are upper bounds on
the largest singular value of the open-loop response. For more information about singular
values, see sigma.Use Loop Shape Goal when the loop shape near crossover is simple or well understood
(such as integral action). To specify only high gain or low gain constraints in certain
frequency bands, use “Minimum Loop Gain Goal” on page 10-128 or “Maximum Loop
Gain Goal” on page 10-134. When you do so, the software determines the best loop shape
near crossover.CreationIn the Tuning tab of Control System Tuner, select New Goal > Target shape for open-
loop response to create a Loop Shape Goal.Command-Line EquivalentWhen tuning control systems at the command line, use TuningGoal.LoopShape to
specify a loop-shape goal.Open-Loop Response Selection
Use this section of the dialog box to specify the signal locations at which to compute the
open-loop gain. You can also specify additional loop-opening locations for evaluating the
tuning goal.- Shape open-loop response at the following locations
Select one or more signal locations in your model at which to compute and constrain
the open-loop gain. To constrain a SISO response, select a single-valued location. For
example, to constrain the open-loop gain at a location named 'y', click Add signal
to list and select 'y'. To constrain a MIMO response, select multiple signals or a
vector-valued signal.- Compute response with the following loops open
Select one or more signal locations in your model at which to open a feedback loop for
the purpose of evaluating this tuning goal. The tuning goal is evaluated against the
open-loop configuration created by opening feedback loops at the locations you
identify. For example, to evaluate the tuning goal with an opening at a location named
'x', click Add signal to list and select 'x'.10 Control System Tuning