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Uncertainty Analysis with Simulink Models

Simulate uncertainty effects, compute stability margins

Robust Control Toolbox™ software provides tools to model uncertain dynamics in Simulink®. Using these tools, you can analyze how the uncertainty impacts the time-domain and frequency-domain behavior of a system modeled in Simulink.


ufindFind uncertain variables in Simulink model
ulinearizeLinearize Simulink model with Uncertain State Space block
usampleGenerate random samples of uncertain variables in a Simulink model
diskmarginDisk-based stability margins of feedback loops


Uncertain State SpaceSpecify uncertain system in Simulink
MultiPlot GraphPlot multiple signals


Analyzing Uncertainty in Simulink

Robust Control Toolbox software lets you model and analyze uncertain dynamics in Simulink.

Specify Uncertainty Using Uncertain State Space Blocks

Use the Uncertain State Space block to represent uncertain elements in a Simulink model.

Simulate Uncertainty Effects

Simulate uncertain systems using nominal values or samples within the uncertainty range.

Vary Uncertainty Values Using Individual Uncertain State Space Blocks

For simple models with few uncertain variables, you can vary uncertainty values on a block-by-block basis.

Vary Uncertainty Values Across Multiple Uncertain State Space Blocks

For models with a large number of uncertain variables or multiple Uncertain State Space blocks, you can vary multiple uncertainty values simultaneously.

Stability Margins of a Simulink Model

Compute classical and disk-based gain and phase margins of a control loop modeled in Simulink.

Featured Examples