Flight Control Analysis Tools

To help you visualize handling and flight control results, Aerospace Toolbox provides functions for:

For an example of how to plot the results of the 3DOF airframe in the Sky Hogg model from the Aerospace Blockset™, see Plot Short-Period Undamped Natural Frequency Results. This example describes how to use the Aerospace Blockset `asbFlightControlAnalysis` (Aerospace Blockset) function to guide you through computing longitudinal and lateral-directional flying qualities. From the results, you can extract the short-period undamped natural frequency response for plotting using the `shortPeriodCategoryAPlot` function.

Plot Short-Period Undamped Natural Frequency Results

Aerospace Blockset flight analysis tools generate many variables that you can explore. For example, the analysis of a 3DOF or 6DOF airframe generates the short-period undamped natural frequency response ωnSP. This example describes how to compute lateral-directional handling qualities and plot the category A flight phase for the short-period undamped natural frequency response ωnSP using one of the `shortperiod` functions.

Note

This topic requires an Aerospace Blockset license.

1. Start the flight control analysis template for the 3DOF configuration.

`asbFlightControlAnalysis('3DOF')`

The `3DOF Sky Hogg Longitudinal Flying Quality Analysis` project starts in the Simulink® Editor.

2. To compute longitudinal and lateral-directional flying qualities, in the Analysis Workflow section, click through the guided workflow, click OK when prompted.

3. After computing longitudinal and lateral-directional flying qualities, find and double-click the `lonFQ` structure in your workspace.

In the variables viewer, double-click the `ShortPeriodMode` variable.

4. Check that the `wn` variable exists. The `wn` variable is the short-period undamped natural frequency response you want to plot.

5. Plot the short-period undamped natural frequency response. In the MATLAB® Command Window, use the `shortPeriodCategoryAPlot` function. For example, for a load factor per angle of attack of `10`, enter this command.

`shortPeriodCategoryAPlot(10, lonFQ.ShortPeriodMode.wn, 'ro')`

A figure window with the plotted short-period undamped natural frequency response displays.

6. To evaluate if the results are within your tolerance limits, check that the red dot is within your limits.