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about the aircraft model input/output structure; see chapter 10 for more information
about the radio-navigation models.
D.1 Aircraft model signal logging
During simulations that involve the nonlinear aircraft model Beaver (or one of its
subsystem equivalents; see chapter 8 for more information), all input and output
signals are logged in the workspace variables In and Out, respectively. In addition, a
matching time-axis is logged in the variable time. The reason for including the input
signals is that these do not necessarily have to be pre-determined by the user; they
may also be generated by external systems, such as an autopilot controller.
The workspace variables In and Out are matrices. The number of rows is equal to
the length of the vector time, which corresponds with the total number of logged data
points. Each column represents a time-trajectory of an individual input or output
signal. In total, there are twelve logged input signals, and 89 logged output signals,
which have been ordered in the sequence shown in tables D.3 and D.2.
After performing a simulation, it is possible to plot an individual input or output
trajectory, using the command: plot(time,In(:,i )), or plot(time,Out(:,i )),
where i represents the column number of the required signal. Notice that the utility
RESULTS can convert these matrices into human-legible variables for all individual
input and output trajectories, while the macro RESPLOT can be used to provide
a quick graphical overview of the time-trajectories stored in In and Out. See sections
12.6.3 and 12.6.4 for more information.
The logged signals from the aircraft model correspond to the inputs and outputs
of the subsystem Beaver Level 2, the main level of the aircraft model. The inputs
310 Appendix D. Data structure of the FDC model output signals
are also equal to those of the top-level of the aircraft model (Beaver Level 1), but
the outputs from the top-level only comprise a small subset of the 89 output signals
logged in Out. This has been explained in more detail in the descriptions of Beaver
Level 1 and Beaver Level 2 in the reference chapter 8. Table D.1 shows the definition
of the resulting output vector from the aircraft model. This vector provides the necessary
connection between the aircraft model and external systems; the current choice
of signals provides enough information for the Beaver autopilot simulations from
chapter 15.
The information from tables D.3, D.2, and D.1 can also be displayed in your webbrowser
or theMATLAB help browser (depending on yourMATLAB-setup) by typing
browse inputs or browse outputs on the command-line. More information about
the utilities RESULTS and RESPLOT is available in the command-window by typing
help results/help resplot, or in the webbrowser or MATLAB help browser
by typing browse results/browse resplot.
D.2 Radio navigation signal logging
During simulations involving the ILS example system ILS example, all important
results are stored in the workspace variable yils. Simulations involving the VOR
example system VOR example will store output information in yvor.
These variables are again matrices, which have a similar structure as the matrices
In and Out from the aircraft model. The ILS and VOR example systems do not create
a separate time-axis, as this task is normally already done by the aircraft model (if
ILS example and/or VOR example are used in combination with a model that does
not take care of this task, it is necessary to include the required time signal yourself,
e.g. by incorporating an additional Clock block, connected to a To Workspace block.
Tables D.4 and D.5 show the definitions of the matrices yils and yvor; the corresponding
column-numbers are displayed underneath the symbols. See the description
of the systems ILS example and VOR example in chapter 10 for more information.
Inputs: de da dr df n pz uw vw ww u˙w v˙w w˙ w
1 2 3 4 5 6 7 8 9 10 11 12
Outputs: V a b p q r y q j xe ye H
1 2 3 4 5 6 7 8 9 10 11 12
˙H
pb
2V
qc
V
rb
2V
13 14 15 16
Table D.1: Definition of the input and output signals of the aircraft model (see the description
of ‘Beaver Level 1’ in chapter 8 for more information)
D.2. Radio navigation signal logging 311
Sub- Output signals from the aircraft model, logged in the matrix Out
vector
x V a b p q r y q j xe ye H
1 2 3 4 5 6 7 8 9 10 11 12
˙x ˙V
˙a
˙b
˙ p ˙ q ˙ r ˙y
˙q
˙j
x˙e y˙e ˙H
13 14 15 16 17 18 19 20 21 22 23 24
ybvel u v w
25 26 27
yuvw u˙ v˙ w˙
28 29 30
ydl
pb
2V
qc
V
rb
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FDC 1.4 – A SIMULINK Toolbox for Flight Dynamics and Contro(110)
