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Adams General Forum Is there a way to set a motion statement to rotate an object around each of it's own axis?

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Is there a way to set a motion statement to rotate an object around each of it's own axis?

sarah.m.callan over 3 years ago

I can only figure out how to move it in reference to another object, and setting an initial velocity won't work for this scenario.

0 Maziar R over 3 years ago

Hi Sarah,

The rotational DOF's of the General Point Motion actually is about the local reference frame (X, Y' and Z'').

You can also look into the MOTION statement in the Solver docs at:

Adams Basic Package > Adams Solver > Welcome to the C++ Version of Adams Solver > C++ Statements > MOTION

and refer to the B1, B2 and B3 arguments to read more.

Thank you,

Maziar Rostamian

MSC Software
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0 sarah.m.callan over 3 years ago

Is it possible though to move an object about its own CM in all 3 directions? The General Point Motion always wants a J marker, but in my case the J marker would be the same as the I marker.
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0 Maziar R over 3 years ago

I am not aware of a way to do this unless it is with a body-moving force instead of a motion.
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0 Jesper Slattengren over 3 years ago

Sarah, the marker motion differs from (all) other objects in that is actually the i-marker that defines the axis of rotation. The j-marker is there to apply a reaction torque to.

See the attached model. Simulate for 3 seconds and animate with the icons on.

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MODEL_1.cmd.zip
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