kan said: (by the date of Fri, 2 Oct 2009 17:49:18 -0500) > Hi,Mr. Janek, > > > I have some questions; > 1. for equation (34), I think the mi should not be there, what do you think?
that's a simplifications on yade's side. Go into code and see how `I` is calculated. You will see that `I` is already multiplied by mass, to save on repeating this one multiplication every time . I was against this from start, but Olivier insisted that optimisation is so important... I would prefer to either rename `inertia` to `inertia_times_mass` or removing mass from it. > 2. for the contact moment M(vector), in eqn (25), what is the physical > meaning? it's as if the spheres were glued together. Or as if they had a rough surface which is able to transfer moment. If you use contact moments and have a "line" of spheres touching each other, then they behave as a one long beam. -- Janek Kozicki | _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
