Mass moment of inertia1/23/2024 ![]() ![]() You can see the local coodinate system being defined in the code above. Keyo,1,3,0 ! 3D Mass With Rotary Intertia Keyo,1,2,1 ! Moments of inertia in nodal coordinates ![]() Here is the code for that rigid body that was sent to the solver, it is a MASS21 element. Then the correct principal inertia will be submitted when you solve the model. What I would do if I had the solid object in CAD is simply to import this into Mechanical, assign it to be a Rigid Body, create a material with the correct density for that body, and assign that material to that body. Looking at the options on the definition of a new coordinate system, I don’t see a way to do this. I have not figured out how to get this coordinate system into Mechanical. ![]() Paste that into a text editor and repeat two more times to get the three values. Hover over any row and you can copy the data to the clipboard. The Principal Inertia values and axes will display. Assign the body a Material in the Properties window. In SpaceClaim, on the Measure tab, click the Mass Properties button then select a solid body. The inertia inputs are Principal Inertias relative to the coordinate system used to define them. ![]() If you open the ANSYS Help system, you can read the description of that element in the Element Library. The Point Mass in Mechanical Workbench creates a MASS21 element for the mechancial solver to use. ![]()
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