Welcome to 3DCADForums

Join our CAD community forums where over 25,000 users interact to solve day to day problems and share ideas. We encourage you to visit, invite you to participate and look forward to your input and opinions. Acrobat 3D, AutoCAD, Catia, Inventor, IronCAD, Creo, Pro/ENGINEER, Solid Edge, SolidWorks, and others.

Register Log in

Measuring Negative Inertia Values in CATIA V5

Howdy all,

When measuring the inertia values of a part in CATIA, I am getting negative values for Iyz and other off-diagonal terms in the inertia matrix. I've attached a screenshot.

I am putting this part in an assembly, which ends up with a negative Ixz value.

Why are these values negative? I am using these values in a separate simulation, so I am expecting positive values for Ixy, Ixz, and Iyz.

The principle axis values are positive; however, I am interested in the inertias about a separate axis, not the principle axis for my simulation.

Please let me know how I can fix this problem. Thanks a lot.