Linearize Simulink models
The Model Linearizer lets you perform linear analysis of nonlinear Simulink® models.
Using this app you can:
Interactively linearize models at different operating points
Interactively obtain operating points by trimming or simulating models
Perform exact linearization of nonlinear models
Perform frequency response estimation of nonlinear models
Batch linearize models for varying parameter values
Generate MATLAB® code for performing linearization tasks
Generate MATLAB code for computing operating points
Simulink Toolstrip: On the Apps tab, under Control Systems, click Model Linearizer.
Simulink Toolstrip: On the Apps tab, under Control Systems, click Frequency Response Estimator.
Simulink Toolstrip: On the Linearization tab, click Model Linearizer.
Simulink Toolstrip: On the Linearization tab, click Frequency Response Estimator.
Simulink Toolstrip: On the Linearization tab, click Linearize Block.
Analysis I/Os
— Linearization inputs, outputs, and loop openingsModel
I/Os
(default) | linearization I/O setLinearization inputs, outputs, and loop openings. The currently active I/O set is displayed. To change the I/O set, select one of the following:
Model I/Os
— Use the inputs, outputs, and loop openings specified in the Simulink model. For more information on specifying analysis points in your model, see Specify Portion of Model to Linearize in Simulink Model.
Root Level Inports and Outports
— Use the root level inputs and outputs of the Simulink model.
Linearize the Currently Selected Block
— Use the input and output ports of the currently selected block in the Simulink model.
Create New Linearization I/Os
— Specify inputs, outputs, and loop openings. For more information, see Specify Portion of Model to Linearize in Model Linearizer.
Existing I/Os
— Select a previously created I/O set.
View/Edit
— View or edit the currently selected operating point. For more information, see Edit Analysis Points.
Operating Point
— Linearization operating pointModel Initial
Condition
(default) | operating pointLinearization operating point. The current operating point is displayed. To change the operating point, select one of the following:
Model Initial Condition
— Use the initial conditions defined in the Simulink.
Linearize At
— Simulate the model using the model initial conditions, and use the simulation snapshot at the specified time as the operating point. For more information, see Linearize at Simulation Snapshot.
Linearize at Multiple Points
— Select multiple previously created operating points.
Existing Operating points
— Select a previously created operating point.
Trim Model
— Compute a steady-state operating point. For more information, see Compute Steady-State Operating Points.
Take Simulation Snapshot
— Simulate the model using the model initial conditions, and compute an operating point at the specified simulation snapshot times. For more information, see Find Operating Points at Simulation Snapshots.
View/Edit
— View or edit the currently selected operating point.
Parameter Variations
— Parameters to vary for batch linearizationNone
(default) | parameters to varyTo vary parameters for batch linearization, in the
drop-down list, click Select parameters
to vary
. On the Parameter
Variations tab, specify the parameters
to vary.
For more information, see Specify Parameter Samples for Batch Linearization.
Result Viewer
— Open linearization result vieweroff
(default) | on
Select to display result details after linearization. For more information, see View Linearized Model Equations Using Model Linearizer.
Linearization Advisor
— Collect diagnostic information and open Linearization Advisoroff
(default) | on
Select to collect diagnostic information during linearization and open an Advisor tab for interactive troubleshooting of linearization problems. For more information, see Troubleshoot Linearization Results in Model Linearizer.
Note
The Model Linearizer only collects diagnostic information when Linearization Advisor is checked before performing a linearization task.
Input Signal
— Estimation input signalSinestream
| Fixed Sample Time
Sinestream
| Chirp
| Random
Estimation input signal. The current input signal is displayed. To change the input signal, select one of the following:
Sinestream
—
Create an input signal that consists of adjacent
sine waves of varying frequencies. For more
information, see Sinestream Input Signals.
Fixed Sample Time
Sinestream
— Create a discrete-time
sinestream input with a specified sample
time.
Chirp
— Create a
swept-frequency cosine input signal. For more
information, see Chirp Input Signals.
Random
— Create a
random input signal.
Analysis I/Os
— Linearization inputs, outputs, and loop openingsModel
I/Os
(default) | linearization I/O setLinearization inputs, outputs, and loop openings. The currently active I/O set is displayed. To change the I/O set, select one of the following:
Model I/Os
— Use the inputs, outputs, and loop openings specified in the Simulink model. For more information on specifying analysis points in your model, see Specify Portion of Model to Linearize in Simulink Model.
Root Level Inports and Outports
— Use the root level inputs and outputs of the Simulink model.
Linearize the Currently Selected Block
— Use the input and output ports of the currently selected block in the Simulink model.
Create New Linearization I/Os
— Specify inputs, outputs, and loop openings. For more information, see Specify Portion of Model to Linearize in Model Linearizer.
Existing I/Os
— Select a previously created I/O set.
View/Edit
— View or edit the currently selected operating point. For more information, see Edit Analysis Points.
Operating Point
— Linearization operating pointModel Initial
Condition
(default) | operating pointLinearization operating point. The current operating point is displayed. To change the operating point, select one of the following:
Model Initial Condition
— Use the initial conditions defined in the Simulink.
Linearize At
— Simulate the model using the model initial conditions, and use the simulation snapshot at the specified time as the operating point. For more information, see Linearize at Simulation Snapshot.
Linearize at Multiple Points
— Select multiple previously created operating points.
Existing Operating points
— Select a previously created operating point.
Trim Model
— Compute a steady-state operating point. For more information, see Compute Steady-State Operating Points.
Take Simulation Snapshot
— Simulate the model using the model initial conditions, and compute an operating point at the specified simulation snapshot times. For more information, see Find Operating Points at Simulation Snapshots.
View/Edit
— View or edit the currently selected operating point.
Result Viewer
— Open estimation result vieweroff
(default) | on
Select to display result details about the estimation configuration and input signal used for estimation.
Diagnostic Viewer
— Collect diagnostic information and open diagnostic vieweroff
(default) | on
Select to collect diagnostic information that displays after estimation. You can use the diagnostic information to analyze the estimation result and troubleshoot estimation problems. For more information, see Analyze Estimated Frequency Response.
Note
The Model Linearizer only collects diagnostic information when Diagnostic Viewer is selected before performing an estimation task.