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LS Dyna

LS Dyna

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Explicit Dynamics not behaving as expected

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    • June 3, 2026 at 12:23 pm
      david.mccul
      Subscriber

      Hello all, I'm hoping to find some help here. Hopefully I am just misunderstanding the physics of what i going on.

      So i set up an Explicit Dynamics sim of a rotating shaft coupling impacting a guard. The axis of the coupling is angled 45deg off the YZ plane and 30deg off the XY plane. Coupling is set to rotate around the coupling center axis at 2000rpm and translate 2000in/sec in the global Y direction. Or so i think. But the solution is showing the coupling rotating as expected, but translational movement is mostly in the X global direction with some translation in the intended Y global direction. 

      Attached are some pictures of the setup. I'm sure there will be questions and more information i have not thought to answer and provide, so please ask.

      My question is why is the coupling translating mostly in X instead of Y as intended? Is it because i am misunderstanding the effects of angular momentum?

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