Simulink Control Design™ - MathWorks

Validate Linearization In Frequency Domain

Validate Linearization in Frequency Domain using Linear

Analysis Tool

This example shows how to validate linearization results using an estimated linear model.

In this example, you linearize a Simulink model using the I/Os specified in the model. You

then estimate the frequency response of the model using the same operating point (model

initial condition). Finally, you compare the estimated response to the exact linearization

result.

Linearize Simulink Model

(^1) Open the model.
sys = 'scdDCMotor';
open_system(sys)
(^2) Open the Linear Analysis Tool for the model.
In the Simulink model window, select Analysis > Control Design > Linear
Analysis.
(^3) Linearize the model at the default operating point and analysis I/Os, and generate a
bode plot of the result.
Click Bode. The Bode plot of the linearized plant appears, and the
linearized plant linsys1 appears in the Linear Analysis Workspace.
Estimate Frequency Response of Model
(^1) Create a sinestream input signal for computing an approximation of the model by
frequency response estimation. In the Estimation tab, in the Input Signal drop-
down list, select Sinestream.
(^2) Initialize the input signal frequencies and parameters based on the linearized model.
Click Initialize frequencies and parameters.
Validate Linearization In Frequency Domain