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CG of rigid body

matteo.franze

I would like to check the effect of varying the CG position of a rigid part.

Is there a quick way to move the CG in Adams 2024? I cannot find any option in the mass properties menu and I assume moving the CM marker will not actually move the center of gravity...

Thank you

  • 0

    Hello

    In Adams, there is no direct menu option to move the center of gravity (CG) of a rigid part. The CG is determined by the part's geometry and mass , and simply moving the CM marker does not affect the actual mass properties. To vary the CG, you need to adjust the part's geometry or use the Aggregate Mass tool to compute and create a marker at the new CG location. For parametric studies, you can use design variables to shift the geometry or mass distribution.

  • 0

    Additionally, for a single part, as opposed to the aggregate mass of the model as a whole, you can move the cm marker to change the centre of gravity.  For example, moving the cm of a cantilever along its longitudinal axis:

    However, please note that this will break the automatic parameterization of the cm marker based on the geometry.  Selecting Geometry and Material Type or Geometry and Density will re-establish this parameterization.

  • 0 in reply to MG

    That is not correct! Only if your model is built using geometries to define the mass properties is this true. 

    But even then, you can simply modify the part and change the parts mass definition from "Geometry and Material Type" to "User Input". When you do this, the current mass properties will be shown as default values, but you can change any value you want.

    And if you have selected this option, you can move the CM marker and the center of gravity will move with it.

    Adams is built to be flexible and to allow for building and analyzing models before there is any CAD geometry available, so of course you can specify everything directly. Many parts in my models might not even have any geometry associated with it, but they still have mass (even though I do not recommend this as it makes it harder to debug the model).

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