Our website uses cookies. By using the website you agree ot its use. More information can be found in our privacy policy.

Part inertia

The moments of intertia (Ixx, Iyy etc.) have to be define, when using the *PART_INERTIA keyword card. Furthermore, the code must know the appropriate reference axes. Sometimes the inertia values are provided to the analyst in a coordinate system that is different than the global coordinate system. In such a case, IRCS=1 allows the user to input those inertia values directly without firstly  convert them to the global system. LS-DYNA will do the conversion automatically. Whether a global or local reference system is used in the input, that reference system always has its origin at the center-of-mass of the rigid body.