Discussions

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March 8 2013 update

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A good servo model has been added

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Here is a Simulink simulator for the UavDevBoard MatrixPilot.

MatrixPilot has been entirely programmed (wind estimation, IMU, control loops...).

The airplane is the Scorpio Miss. This airplane is rudder only. So you will need to modify the bank control

algorithm if you want to use a plane fitted with ailerons.

The autopilot is true to the original except for the type of the variables : real rather than fractional.

Model file : Miss_Sim_MatrixPilot.mdl

Airplane file : Miss_Data.m

MatrixPilot parameter file : MatrixPilot_Parameters.m

S-Function file (IMU, DCM, wind estimation) : R.c

1- Put all the files into one directory. Run Matlab/Simulink, go to the directory.

2- Compile the S-Function   (instruction : mex R.c at the Matlab prompt)

3- Load the parameters       (instruction : Miss_Data at the Matlab prompt)

4- Load the simulink model  (instruction : Miss_Sim_MatrixPilot at the Matlab prompt

Note:

a/ Miss_data.m will call MatrixPilot_Parameters.m

b/ Don't forget to install lcc, the Matlab default compiler. Just type and enter mex -setup at the Matlab prompt and follow the instructions

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December 12 2012 update

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Here is the simulator with the UavDevBoard MatrixPilot.

MatrixPilot has been entirely programmed (wind estimation, IMU, control loops...).

The airplane is the Scorpio Miss. This airplane is rudder only. So you will need to modify the bank control

algorithm if you want to use a plane fitted with ailerons.

The autopilot is true to the original except for the type of the variables : real rather than fractional.

Model file : Miss_Sim_MatrixPilot.mdl

Airplane file : Miss_Data.m

MatrixPilot parameter file : MatrixPilot_Parameters.m

S-Function file (IMU, DCM, wind estimation) : R.c

1- Put all the files into one directory. Run Matlab/Simulink, go to the directory.

2- Compile the S-Function   (instruction : mex R.c at the Matlab prompt)

3- Load the parameters       (instruction : Miss_Data at the Matlab prompt)

4- Load the simulink model  (instruction : Miss_Sim_MatrixPilot at the Matlab prompt)

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December 20 2011 update

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I have corrected :

- a mistake in the computation of the force wrench (bref was used instead of cref for the moment M)

subsystem Aerodynamic Model

- a mistake in the moment of inertia tensor (sign of one of the product inertia)

subsystem Equations of Motion

I have also unified the format of the stability derivatives

subsystem Aerodynamic Model and files P.m

So here are the new simulink model and the stability derivative file

- for the Super Chipmunk airplane :

Chip_Sim.mdl  Chip_Data.m

- for the Miss Europa airplane :

Miss_Sim.mdl  Miss_Data.m

These files replace the previous P.mdl and P.m files.

Here is also the DCM program you need to compile with the Matlab compiler (you may get rid of this

function if you like) R.c

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First post 2010

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Here is a Simulink airplane simulator working together with aerodynamic coefficients and stability

coefficients computed with Mark Drela's AVL program. The simulink model file is P.mdl:

P_sim.mdl

The aerodynamic coefficients and stability derivatives are functions of the Angle of Attack and are written

in the P.m file (Super Chipmunk): P.m

I have computed the coefficients of the CG Super Chipmunk and of the Scorpio Miss Europa. Miss Europa

is the sistership of the Super Miss, Icebear's famous airplane (good job Icebear !)

Below are the AVL files used to generate the coefficients of the Super Chipmunk:

chipmunk.avl

chipmunk.mass

FuseChipmunk.dat

naca0012.dat

Below are the AVL files used to generate the coefficients of the Miss Europa:

Miss.avl

Miss.mass

FuseMiss.dat

Clarky.dat

And the resulting file for Simulink:

P.m

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If you want to compute the coefficients for another airplane, you need to create the .avl, .mass,

fuselage.dat and airfoil.dat files and run the AVL program a few times (for every AoA). If some of you guys

are interested, I can write a draft on the way to generate the coefficients with AVL.

If you just want to test the simulator with the Super Chipmunk, you just have to type P at the Matlab

prompt and then launch the P.mdl file.

This P.mdl simulink model has been used to test the DCM algorithm and also the EKF.

If you want to have a look, here are the R.c (DCM) and EKF.c (Extended Kalman Filter) S-Functions.

R.c

EKF.c

You need to compile them. At the Matlab prompt type "mex R.c" and "mex EKF.c"

Otherwise get rid of them in the P.mdl model.