During simulation, the block can also output a logical assertion signal:
- If all bounds are satisfied, the signal is true ( 1 ).
- If a bound is not satisfied, the signal is false ( 0 ).
You can add multiple Check Nichols Characteristics blocks in your model to check gain
and phase bounds on various portions of the model.
You can also plot the linear system on a Nichols plot and graphically verify that the
Nichols response satisfies the bounds.
This block and the other Model Verification blocks test that the linearized behavior of a
nonlinear Simulink model is within specified bounds during simulation.
- When a model does not violate any bound, you can disable the block by clearing the
assertion option. If you modify the model, you can re-enable assertion to ensure that
your changes do not cause the model to violate a bound. - When a model violates any bound, you can use Simulink Design Optimization software
to optimize the linear system to meet the specified requirements in this block.
You can save the linear system as a variable in the MATLAB workspace.
The block does not support code generation and can be used only in Normal simulation
mode.
Parameters
The following table summarizes the Nichols Plot block parameters, accessible via the
block parameter dialog box. For more information, see “Parameters” on page 16-182 in
the Nichols Plot block reference page.
Task Parameters
Configure
linearization.Specify inputs and
outputs (I/Os).In Linearizations tab:- Linearization inputs/outputs
- Click a model signal to add it as a
linearization I/O
Check Nichols Characteristics