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Problem with Quaterniones

Posted 8 years ago

Hi

I have a simple model: a world frame and a body from the multibody library. If I simulate it it works fine. But when I switch the "useQuaternions" option to false I get an error.

"Error: Internal error Fatal failure: failtrace"

Thanks in advance.

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Hello Valentin,

It seems like the error is caused by a bug in SystemModeler. We are looking into this.

However if you would like to simulate it without using quaternions, you could make it work by connecting the body to a Modelica.Mechanics.MultiBody.Joints.FreeMotion and then the freeMotion to the world component. See my attached model.

I hope this helps!

Thanks, Markus

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POSTED BY: Markus Dahl
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