Simulink Control Design™ - MathWorks

Analysis Point Description

Sensitivity

function

Specifies an input perturbation followed by an output measurement.

The sensitivity function measures how sensitive a signal is to an added

disturbance. Sensitivity is a closed-loop measure. Feedback reduces

the sensitivity in the frequency band where the open-loop gain is

greater than 1.

For example, to compute the sensitivity at the plant input of the

example system, add a sensitivity function analysis point as shown.

The software adds an input perturbation du followed by an output

measurement u. The closed-loop transfer function from du to u is 1/

(1+KG).

K G

r e

+

du

u

2 Linearization