Simulink Control Design™ - MathWorks

Definitions

Analysis Points

Analysis points, used by the slLinearizer and slTuner interfaces, identify locations

within a model that are relevant for linear analysis and control system tuning. You use

analysis points as inputs to the linearization commands, such as getIOTransfer,

getLoopTransfer, getSensitivity, and getCompSensitivity. As inputs to the

linearization commands, analysis points can specify any open-loop or closed-loop transfer

function in a model. You can also use analysis points to specify design requirements when

tuning control systems using commands such as systune.

Location refers to a specific block output port within a model or to a bus element in such

an output port. For convenience, you can use the name of the signal that originates from

this port to refer to an analysis point.

You can add analysis points to an slLinearizer or slTuner interface, s, when you

create the interface. For example:

s = slLinearizer('scdcascade',{'u1','y1'});

Alternatively, you can use the addPoint command.

To view all the analysis points of s, type s at the command prompt to display the interface

contents. For each analysis point of s, the display includes the block name and port

number and the name of the signal that originates at this point. You can also

programmatically obtain a list of all the analysis points using getPoints.

For more information about how you can use analysis points, see “Mark Signals of

Interest for Control System Analysis and Design” on page 2-53 and “Mark Signals of

Interest for Batch Linearization” on page 3-13.

Permanent Openings

Permanent openings, used by the slLinearizer and slTuner interfaces, identify

locations within a model where the software breaks the signal flow. The software enforces

these openings for linearization and tuning. Use permanent openings to isolate a specific

model component. Suppose that you have a large-scale model capturing aircraft dynamics

and you want to perform linear analysis on the airframe only. You can use permanent

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