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[FAQ]

Question: For large assembly models that contain multiple bodies, as well as point masses, I am not aware of a way to obtain the Center of Gravity (CG) in Workbench Mechanical other than calculating it myself. The other way is to make the assembly a multi-body part in DesignModeler and bring it back into mechanical to get the CG, but that will not include the point masses. Is there an easier feature that I am missing to quickly obtain the CG of my model? Answer: If you would like to determine the CG of a group of parts, including Point Mass(es), suppress all other parts that are not of interest. Insert a blank “Commands (APDL)” object and solve the model. Review the Solver Output under the “Solution Information” branch and use Ctrl+F to search for the term “CENTER OF MASS”. You will find output similar to the one below, which provides the mass property information of the unsuppressed parts, including Point Masses: —– Begin sample output CENTER OF MASS (X,Y,Z)= -0.25591 0.29587 -0.98425E-01 TOTAL INERTIA ABOUT CENTER OF MASS 0.32906E-04 0.44046E-19 -0.18635E-19 0.44046E-19 0.57729E-04 0.35575E-19 -0.18635E-19 0.35575E-19 0.47116E-04 The inertia principal axes coincide with the global Cartesian axes —– End sample output (If your solution fails to solve completely, don’t worry, as the above output is all that is desired. Please remember to unsuppress all required parts for your actual solution.)