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Mass/inertia properties of a full model
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Up=upcom('load GartUp'); m=upcom(Up,'assemble m not'); rb=feutilb('geomrb',Up.Node,[0 0 0],Up.DOF); IN=rb.def'*m*rb.def % inertia matrix at 0 CG=[IN(2,6) -IN(1,6) IN(1,5)]/IN(1) % CG location [u,s,v]=svd(IN(4:6,4:6));u % principal axes of inertia rb=feutilb('geomrb',Up.Node,CG,Up.DOF); IN_CG=rb.def'*m*rb.def % inertia matrix at CG