Component—Moment of Inertia Quantities
If you choose Moment of Inertia as the measure quantity, you can select from a variety of components. These components fall into two categories—part-based component directions and coordinate-system-based component directions.
Creo Simulate provides the following part-based component directions: maximum principal, mid principal, and minimum principal. These component directions are relative to the principal inertial axes of the model. Specify Max Principal to define the measure relative to the direction with the greatest inertia. Use Min Principal to define the measure relative to the axis of least inertia.
The orientation of the principal inertial axes of your part lies where all products of inertia are zero simultaneously.
If you select one of the component directions instead, Creo Simulate determines the moment of inertia relative to the current coordinate system in the direction you selected.