Simulink Control Design™ - MathWorks

Linearization Validation in Frequency Domain Using

FRESTIMATE

This example shows how to validate a block-by-block analytical linearization result usinf

frequency response estimation. To run this example, you need Aerospace Blockset™

software.

Open the Model

Open the Simulink model for the lightweight airplane. For more information on this

model, see “Lightweight Airplane Design” (Aerospace Blockset).

mdl = 'scdskyhogg';

open_system(mdl)

Analytically Linearize Model

You can linearize the lightweight airplane model from the altitude command signal,

AltCmd, to the sensed height, h_sensed. These linear analysis points are already

specified in the model.

io = getlinio(mdl)

2x1 vector of Linearization IOs:

--------------------------

1. Linearization input perturbation located at the following signal:

• Block: scdskyhogg/Pilot/Add


• Port: 1


• Signal Name: AltCmd

2. Linearization output measurement located at the following signal:

• Block: scdskyhogg/Vehicle System Model/Avionics/Autopilot/Bus Selector1

5 Frequency Response Estimation