LTI Viewer for SISO Design Task Design Requirements

Overview of LTI Viewer Design Requirements

You can use the LTI Viewer for SISO Design Tasks to specify both time and frequency domain requirements in analysis plots. Adding and editing design requirements is similar to those illustrated in the Graphical Tuning window.

    Note:   To add design requirements, you must open the LTI Viewer from the SISO Design Task in the Control and Estimation Tools Manager. Design requirements are not available from an LTI Viewer that is opened using the ltiview command.

For row or column arrays of LTI models, the design requirements are for the nominal model that you are designing the controller for. You can analyze the effects of this controller on the remaining models. See Control Design Analysis of Multiple Models in the Getting Started Guide.

Available Design Requirements in the LTI Viewer

The design requirements for Bode, Root Locus, and Nichols plots can be applied to both graphical tuning windows and the LTI viewer. See Design Requirements for information on graphical tuning design requirements.

You can also specify the following design requirements for both step and impulse response plots:

  • Upper time response bounds — Creates an upper amplitude bound for a specified time duration.

  • Lower time response bounds — Creates a lower amplitude bound for a specified time duration.

If you are using a step response plot, you can also specify the following design requirement:

  • Step response bounds — Creates a group of upper and lower time response bounds, in the shape of a step response envelope, to encompass your specified design requirement parameters.

Example: Time Domain Requirement

This example shows you how to create a lower bound time response design requirement.

  1. At the MATLAB® prompt, type the following:

    load ltiexamples
  2. From the Analysis Plot pane, select step response. See Analysis Plots if you are unfamiliar with this task.

  3. Select Design Requirements->New from the LTI Viewer right-click menu.

  4. Select Lower time response bound from the Design requirements menu.

  5. Set Time from 0.1 to 0.5 s.

  6. Set Amplitude from 0 to 0.8. Your New Design Requirement window should look like this.

  7. Click OK. This adds the design requirement. Your step response should look like this.

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