Simulink Control Design™ - MathWorks

Common Problematic Blocks

Some Simulink blocks have properties that cause them to linearize poorly. Often, such
blocks either linearize to zero or have linearization diagnostic messages associated with
them. Therefore, the Linearization Advisor identifies them as potentially problematic
blocks when the Advisor tab first opens.

The following table shows some blocks that commonly cause linearization issues and
proposes potential fixes for each block. All these blocks have corresponding diagnostic
messages.

Block Type Linearization Issue Possible Fix

Blocks that do not

support linearization

Some blocks are implemented without

defined analytic Jacobians and do not

support numerical perturbation.

Specify a custom block

linearization. For

examples, see “Specify

Linear System for Block

Linearization Using

MATLAB Expression” on

page 2-162 and “Specify

D-Matrix System for

Block Linearization

Using Function” on page

2-163.

Block Linearization Troubleshooting