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flight control analysis tools

to help you visualize handling and flight control results, aerospace toolbox provides functions for:

  • short-period undamped natural frequency responses — , , and

  • boundary lines —

  • altitude contours —

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 (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.

    lonfq structure in workspace

    in the variables viewer, double-click the shortperiodmode variable.

    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.

    short-period undamped natural frequency response plot

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

see also

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