Simulink Control Design™ - MathWorks

Gain and Phase Margin Plot

Gain and phase margins of linear system approximated from nonlinear Simulink model

Library

Simulink Control Design

Description

This block is the same as the Check Gain and Phase Margins block except for different

default parameter settings in the Bounds tab.

Compute a linear system from a nonlinear Simulink model and view the gain and phase

margins on a Bode, Nichols or Nyquist plot. Alternatively, you can view the margins in a

table. By default, the margins are computed using negative feedback for the closed-loop

system.

During simulation, the software linearizes the portion of the model between specified

linearization inputs and outputs, and plots the linear system on the specified plot type.

The Simulink model can be continuous- or discrete-time or multirate and can have time

delays. Because you can specify only one linearization input/output pair in this block, the

linear system is Single-Input Single-Output (SISO).

You can specify only one gain and phase margin bound each and view them on the

selected plot or table. The block does not support multiple gain and phase margin bounds.

You can also check that the bounds are satisfied during simulation:

• If all bounds are satisfied, the block does nothing.

16 Blocks — Alphabetical List