Simulink Control Design™ - MathWorks

input signal. For example, to constrain the gain from a location named 'u' to a

location named 'y', click Add signal to list and select 'u'. To constrain the

passivity of a MIMO response, select multiple signals or a vector-valued signal.

• Specify output signals

Select one or more signal locations in your model as outputs of the transfer function

that the tuning goal constrains. To constrain a SISO response, select a single-valued

output signal. For example, to constrain the gain from a location named 'u' to a

location named 'y', click Add signal to list and select 'y'. To constrain the

passivity of a MIMO response, select multiple signals or a vector-valued signal.

• Compute input/output gain 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'.

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.

Options

Use this section of the dialog box to specify additional characteristics of the passivity

goal.

• Minimum input passivity index

Enter the target value of ν in the text box. To enforce an excess of passivity at the

specified inputs, set ν > 0. To permit a shortage of passivity, set ν < 0. By default, the

passivity goal enforces ν = 0, passive at the inputs with no required excess of

passivity.

• Minimum output passivity index

10 Control System Tuning