If your model does not linearize as expected, you can use the Simulink® Control Design™ troubleshooting tools to diagnose and fix linearization issues. For more information, see Linearization Troubleshooting Overview. When linearizing models in the Model Linearizer or at the command line, you can find blocks in your model that are potentially problematic for linearization. For more information, see Identify and Fix Common Linearization Issues.
Some Simulink blocks can produce poor linearization results. Typically, you must specify custom linearizations for such blocks. For more information, see When to Specify Individual Block Linearization.
Linearization Troubleshooting Overview
If you do not get expected results when you linearize your Simulink model, you can diagnose and fix potential linearization issues using Simulink Control Design troubleshooting tools.
Identify and Fix Common Linearization Issues
Troubleshoot Simulink model linearizations using the Linearization Advisor.
Speed Up Linearization of Complex Models
Large Simulink models and blocks with complex initialization functions can cause slow linearization.
When to Specify Individual Block Linearization
Some Simulink blocks, including those with sharp discontinuities, can produce poor linearization results. Typically, you must specify custom linearizations for such blocks.
Specifying Custom Linearizations for Simulink Blocks
This example shows how to specify the linearization of a Simulink block or subsystem.
Specifying Linearization for Model Components Using System Identification
You can use System Identification Toolbox™ software to identify a linear system for a model component that does not linearize well, and use the identified system to specify its linearization.
Change Perturbation Level of Blocks Perturbed During Linearization
Blocks that do not have preprogrammed analytic Jacobians linearize using numerical perturbation. You can change the perturbation level for your application, which changes the linearization results.
Configure Models with Pulse Width Modulation Signals
Subsystems that contain PWM signals do not linearize well due to discontinuities in the signal.
You can linearize models using exact representations or Padé approximations of continuous-time delays.
You can linearize a Simulink model that contains blocks with different sample times.
Linearize Event-Based Subsystems (Externally Scheduled Subsystems)
Since linearization occurs at a specific moment in time, the trigger event for an externally scheduled subsystem never happens.
Linearize Blocks with Non-Floating-Point Signals or States
Blocks that have non-floating-point signals or states and have no preprogrammed exact linearization automatically linearize to zero. Linearizing such blocks requires converting all signals to double precision.
You can linearize models with Simscape™ components using Simulink Control Design software.