TipTo highlight any selected signal in the Simulink model, click. To remove a signal
from the input or output list, click. When you have selected multiple signals, you can
reorder them using and. For more information on how to specify signal locations
for a tuning goal, see “Specify Goals for Interactive Tuning” on page 10-39.
Desired Loop Shape
Use this section of the dialog box to specify the target loop shape.
- Pure integrator wc/s
Check to specify a pure integrator and crossover frequency for the target loop shape.
For example, to specify an integral gain profile with crossover frequency 10 rad/s,
enter 10 in the Crossover frequency wc text box.- Other gain profile
Check to specify the target loop shape as a function of frequency. Enter a SISO
numeric LTI model whose magnitude represents the desired gain profile. For example,
you can specify a smooth transfer function (tf, zpk, or ss model). Alternatively, you
can sketch a piecewise target loop shape using an frd model. When you do so, the
software automatically maps the profile to a smooth transfer function that
approximates the desired loop shape. For example, to specify a target loop shape of
100 (40 dB) below 0.1 rad/s, rolling off at a rate of –20 dB/decade at higher
frequencies, enter frd([100 100 10],[0 1e-1 1]).If you are tuning in discrete time, you can specify the loop shape as a discrete-time
model with the same sample time that you are using for tuning. If you specify the loop
shape in continuous time, the tuning software discretizes it. Specifying the loop shape
in discrete time gives you more control over the loop shape near the Nyquist
frequency.Options
Use this section of the dialog box to specify additional characteristics of the loop shape
goal.
- Enforce loop shape within
Loop Shape Goal