ArduPilot SITL quadrotor not work

[GChasing]

I have clone the repository via "git clone --recursive -b EuroGNC_2022_flight_test https://github.com/ybeyer/ardupilot.git" but when the flight mode is switch mode 29, the quadrotor in sitl seems to overturns without any controller works. Other modes, such as stabilize works fun. By the way, i add some print message in the "void ModeCustom::run()", but it also doesn't works. I'm starting to wonder if it runs. Thus, please enlighten the right steps how to implement the ftc code for the quadrotor.

[ybeyer]

Hi, I just tried to reproduce the problem, but for me already cloning the ArduPilot fork (git clone --recursive -b EuroGNC_2022_flight_test https://github.com/ybeyer/ardupilot.git) does not work properly. Could you send me the console output of git status in the ArduPilot fork? Maybe you have the same problem.

[GChasing]

Thank you for your replay so quickly. Here are the git logand git status below: Remark: The modified files are mainly for adjusting the difference between your code version and the submodule version. And, can the sitl works without communicating with Matlab/Simulink? As for the practical flight you have done very well. Hope for your replay!

[ybeyer]

I had a problem with my git config but now it works again.

I have an idea what your problem might be. The motors can be switched off with RC 7 and RC 8. In my case RC 7 and RC 8 are initialized with 1500 in the SITL, which is a problem. This means that some motors are saturated at 1500 PWM and causes the quadrotor to rotate moderately fast around the vertical axis. All motors are fully active when RC 7 and RC 8 are set to 1000. You can do this for example via the console: rc 7 1000 rc 8 1000 Complete motor faults can then be injected by setting RC 7 and/or RC 8 to 2000: rc 7 2000 More info can be found in the simulink file ArduCopter_MinnieLoiterFtc in the ardupilot_implementation subfolder.

If that was not the problem, could you share a (private) YouTube video?

The SITL generally also works without Matlab/Simulink. Matlab/Simulink is used here only as a physical model of the quadrotor. However, if you want to use a different simulator you have to make sure that the physical model is very similar. If you want to design a similar controller for a different quadrotor, a look into the Readme of LADAC-Examples may help.

[GChasing]

Thanks for your kindly help.

The record video can be accessed via FTC_ArduPilot_For_Issue. Moreover, I have upload the whole soure code(including the submodule) at github. FTC_ArduPilot_Tmp. Could you please checkout what is wrong? The simplest way is

git clone https://github.com/GChasing/FTC_ArduPilot_Tmp.git
./waf configure  --board=sitl
./waf copter
cd Tool/autotest
./sim_vehicle -v ArduCopter --add-param-file=Minnie.parm --console --map

Thanks agains, and hope keeping in touch!

[ybeyer]

Hi, thanks for the video! If I see it correctly, you are using the standard ArduCopter SITL quadrotor instead of the quadrotor Minnie (Simulink). This quadrotor is probably too different from the quadrotor Minnie, which leads to unstable flight behavior.

Have you already tried the SITL with the Simulink model or do you not have a Matlab license?

I have never done this, but you can certainly configure the quadrotor of the ArduCopter SITL. If you configure the copter like Minnie, it should work. You can find the parameters of Minnie (weight, inertia etc.) in libraries/ladac-examples-data/LADAC_params/Minnie/copter_params_Minnie.m

I hope this helps and you get it working with it.

[GChasing]

I guess you are right about the mismatch quadrotor model I have used. But where is the model(gazebo), I mean,--model=gazebo, located?

I'm trying to use the simulink model in the matlab, but the Matlab(Version 2019a) is installed on another computer, whoes operating system is Windows, and the ArduPilot SITL is running under Ubuntu. The two computer is connected via local wireless network. Remark: QuadcopterSimModel_ArduPilot_SITL/From ArduPilot SITL the receive port has been replaced with 14550/ send port 14551

Or maybe, can you share the video about how to implement the whole SITL system on youtube?

Best wishes and many thanks to you!

[ybeyer]

Sorry for the late reply. Have you made any progress in the meantime?

We don't use Gazebo, we just use the interface for Gazebo (more info here).

I've never done this, but I would assume that you can run SITL on two computers (one computer with ArduPilot and the other computer with the physical simulation model). I did some quick research and found this, for example.

I hope this helps and look forward to your reply!

[GChasing]

I am glad to here your replay. I'm very interested in your work, and want to reproduce your work.

But since the parameters in the standard ArduCopter SITL quadrotor do not work properly, I'm going to learn how to use the Matlab/Simulink module in this repository. Up to now, I can only run the "Customize simulation" section, which is all in Matlab/Simulink module, and it's difficult to understand this so many submodule. However, I'm curious about how to realize that running the code in the Pixhawk, just like the video. Video for this repository.

Can you share some videos about how to implement the whole SITL system on youtube?

[aogrcs]

I have clone the repository via "git clone --recursive -b EuroGNC_2022_flight_test https://github.com/ybeyer/ardupilot.git" but when the flight mode is switch mode 29, the quadrotor in sitl seems to overturns without any controller works. Other modes, such as stabilize works fun. By the way, i add some print message in the "void ModeCustom::run()", but it also doesn't works. I'm starting to wonder if it runs. Thus, please enlighten the right steps how to implement the ftc code for the quadrotor.

Hi, when I run the scripts init_Minie_Loiter_FTC, it says that it could not recognize the variable "copter", have you ever seen this? Thanks My matlab version is 2022b