Simulink Control Design™ - MathWorks

• Blocks that have delays that can cause linearization issues.


• Blocks that are not on the linearization path.

For more information, see “Find Blocks in Linearization Results Matching Specific

Criteria” on page 4-55.

Linearization Path

The linearization path is the graphical connection in the Simulink model from the

linearization inputs to the linearization outputs. A block is on the linearization path if at

least one linearization input is connected to at least one linearization output through that

block. For more information on specifying linearization inputs and outputs, see “Specify

Portion of Model to Linearize” on page 2-13.

When a block is on the linearization path, its linearization can contribute to the overall

model linearization. Blocks that linearize to zero do not contribute to the model

linearization and can prevent branches of the linearization path from contributing to the

model linearization.

Blocks that are not on the linearization path can still affect the linearization of other

blocks, and therefore the model linearization, by modifying the operating points or

parameters of the other blocks. For example, consider the following Product block that is

on the linearization path (highlighted in blue):

The constant block is not on the linearization path. However, the value of the constant

affects the operating point of the Product block, which in turn affects the linearization

from the first input of the Product block to the output.

Highlight Linearization Path

To visualize the linearization path and view blocks that contribute to the model

linearization, you can highlight the linearization path in the Simulink model using the

Linearization Advisor. A block is on the linearization path if there is a signal path from at

4 Troubleshooting Linearization Results