Simulink Control Design™ - MathWorks

Analysis Point Description

Loop break Specifies a loop opening.

Use a loop break to compute open-loop transfer function around a

loop. Typically, you use loop breaks when you have nested loops or

want to ignore the effect of some loops.

In the example system, the loop break stops the signal flow at u. As a

result, the transfer function from the input perturbation de to the

output measurement y is 0.

K G

r u

de

y

Open-loop input Specifies a loop break followed by an input perturbation.

To linearize a plant or controller, you can use an open-loop input with

an output measurement or an open-loop output.

For example, to linearize the plant in the example system, add an

open-loop input before G and an output measurement y after G, as

shown. The open-loop input breaks the signal flow at u, and adds an

input perturbation du.

K G

r e u

y

du

Specify Portion of Model to Linearize