Simulink Control Design™ - MathWorks

The table shows that the linearizations are not computed at exactly every 30 min but at

small variations of 30 min. This is because zero-crossing detection for the block is not

enabled. Enabling zero-crossing for the block ensures that the linearizations are

computed at exactly 30 min intervals but may increase the time the simulation takes to

run.

You can select the Enable zero-crossing detection option in the Block Parameters

dialog box or use the block command line API to enable zero-crossing detection:

set_param('scdaircraft/Check Gain and Phase Margins','ZeroCross','on')

sim('scdaircraft');

Warning: Assertion detected in 'scdaircraft/Check Gain and Phase Margins' at

time 27000

Logging the Linear Systems

The Logging tab in the Check Gain and Phase Margins block specifies that the

computed linear systems be saved to a workspace variable.

14 Model Verification