DYNA_LINE_TRAN /DYNA_TRAN_MODAL help

hi

I am trying to model the free vibration of a cantilever plate using DYNA_TRAN_MODAL and DYNA_LINE_TRAN but with no success.
I am using CAElinux 2009 and salome. i have tried to set it up from the tramplates that come with it but i get a copy error ( say it can't copy the results file)

It would be really helpful if someone can post a .comm file that works or even better post a whole salome project that works, and then i can modify it to my needs.

thanks and hope to hear from someone soon.<br /><br />Post edited by: Kyle Moon, at: 2009/08/07 15:30

hi
thanks Kees for your help and also your contributions on the wiki they have been very helpfull.

I am having another problem now.
Because I am trying to do a free vibration simulation, i need to apply the initial displacement or force (preferably the force) to the mesh and then the force needs to be 0 for the first time step.

I have attached my .comm file that i am planning on using. It would be great if you could look at it and give your comments on what i have done.

If you have forgotten what i am trying to model. it is a free vibration of a cantilever plate (0.2X0.45X0.003 m). clamped at one of the 0.2m ends and a 20N(2 kg weight) at the other. the weight is then remove and allowed to vibrate freely<br /><br />Post edited by: Kyle Moon, at: 2009/09/16 12:57

the file didn't want to upload so here it is:
DEBUT();

meshin=LIRE_MAILLAGE(UNITE=20,
FORMAT='MED',);

mod=AFFE_MODELE(MAILLAGE=meshin,
AFFE=_F(TOUT='OUI',
PHENOMENE='MECANIQUE',
MODELISATION='3D',),);

steel=DEFI_MATERIAU(ELAS=_F(E=2.100e11,
NU=0.3,
RHO=7800,),);

mater=AFFE_MATERIAU(MAILLAGE=meshin,
AFFE=_F(TOUT='OUI',
MATER=steel,),);

loadbc=AFFE_CHAR_MECA(MODELE=mod,
DDL_IMPO=_F(TOUT='OUI',
GROUP_MA='fix',
DX=0,
DY=0,
DZ=0,),);

MACRO_MATR_ASSE(MODELE=mod,
CHAM_MATER=mater,
CHARGE=loadbc,
NUME_DDL=CO('NUMEDDL'),
MATR_ASSE=(_F(MATRICE=CO('RIGIDITE'),
OPTION='RIGI_MECA',),
_F(MATRICE=CO('MASSE'),
OPTION='MASS_MECA',),
_F(MATRICE=CO('AMORE'),
OPTION='AMOR_MECA',),),);

trans=DYNA_LINE_TRAN(MODELE=mod,
CHAM_MATER=mater,
MATR_MASS=MASSE,
MATR_RIGI=RIGIDITE,
MATR_AMOR=AMORE,
NEWMARK=_F(ALPHA=0.25,
DELTA=0.5,),
INCREMENT=_F(PAS=0.001,
INST_INIT=0,
INST_FIN=10.00,),);

IMPR_RESU(FORMAT='MED',
UNITE=21,
RESU=_F(MAILLAGE=meshin,
RESULTAT=trans,),);

FIN();

Hi

Thanks kees i got it working:woohoo: i will upload the .comm file later (currently on vista).
Now I need to know how to pull the results out for on node, not all of them, like it does on salome or gmsh. I need this so that I can compare the simulated results to the experimental results that I got from a laser vibrometer. The idea is to compare the results from one point that the laser recorded to a node as close a possible to the same place from the simulation.

Any help regarding this will be much appreciated.

Thanks

Kyle