Simulink Control Design™ - MathWorks

Check Nichols Characteristics

Check that gain and phase bounds on Nichols response are satisfied during simulation

Library

Simulink Control Design

Description

This block is the same as the Nichols Plot block except for different default parameter

settings in the Bounds tab.

Check that open- and closed-loop gain and phase bounds on Nichols response of a linear

system, computed from a nonlinear Simulink model, are satisfied during simulation.

The Simulink model can be continuous-time, 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).

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

linearization inputs and outputs, computes the magnitude and phase, and checks that the

gain and phase satisfy the specified bounds:

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


• If a bound is not satisfied, the block asserts, and a warning message appears at the
  MATLAB prompt. You can also specify that the block:
  
  
  • Evaluate a MATLAB expression.
  
  
  • Stop the simulation and bring that block into focus.
  
  
  
  

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