Magic T-Handles in Space: Simulating 3D Rotational Dynamics in Modelica

▤ Summary

Similarly, multibody models in Modelica are usually used to predict with precision, rather than explain the bizarre, because objects at everyday speeds rarely do anything astonishing. As the object wobbles, some of that same momentum ends up being about an axis with a much lower inertial moment, and a large rotational velocity results. For a complex behavior, the motion of the T-handle is very easy to simulate in Dymola using the Modelica Standard Library’s Multibody package. The cylinders are defined with constant density, and the Dymola solver calculates the inertia tensor based shape. I also zeroed the starting angles, giving the object an initial orientation aligned with world coordinates.

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