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  1. alain10025

    Missing modes phenomena

    Hello, I am trying hard to find some information about the "missing modes" phenomena resulting from the use of specific preconditionning on stiffness matrices (FEM method). Basically, I am simplifying my stiffness matrix and this leads to missing modes in the new spectrum. Would you know any...
  2. alain10025

    Obtaining mass and stiffness matrices in cylindrical coordinates

    Thanks a lot cbrn, it seems that CSYS, 1 and then NROTAT, ALL can make what I was looking for ! Alain
  3. alain10025

    Drawing data from EMF or XML in Matlab

    Hello, Did you try SDT toolbox ? Regards, Alain
  4. alain10025

    Obtaining mass and stiffness matrices in cylindrical coordinates

    Hello, I tried RSYS,1 and DSYS,1 none of them seems to give waht I am looking for ... I know this is possible to do with Ansys because I did it already with another structure that was imported from Nastran. In order to knoe where could the problem be from I edited the .db files of the...
  5. alain10025

    Obtaining mass and stiffness matrices in cylindrical coordinates

    Hello, I am using Ansys to study a cyclic symmetric structure. But I just use it to obtain the mass and stiffness matrices of an elementary sector. In order to make the analyze of the matrices easier, I need to obtain them in global cylindrical coordinates. It is why I have a problem. After...
  6. alain10025

    Using DMAP language

    Hello, I would like to use DMAP language to invert very large sparse matrices. Would anyone have any recommandation regarding this subject ? Thank you. Alain
  7. alain10025

    Inverting matrices using Nastran

    Hello, I am working with big finite element matrices (64000 x 64000) using sparse function with Matlab. However, in order to inverse one of these matrices, Matlab and sparse are not efficient anymore. I heard that Nastran can be used to do it ... Would anyone know something about it ...
  8. alain10025

    Ansys 8.0 - Error in startup script

    Hello, I have the answer to your problem ... I had the same one and here is the solution: 'Error in start up script' 'can't find package Itcl while executing "package require Itcl" (file "c:\documents and settings\user\program files\ansys inc\v##\commonfiles\launcher\launchermain.itcl"...
  9. alain10025

    Finite element: contact and CMS

    Hello, I am working on contact analysis with large structures. I would like to know if anyone knows something about the algorithms linking Component Mode Synthesis methods and contact algorithms ... Thank you. Alain
  10. alain10025

    Contact and component mode synthesis

    Hello, I am looking for documents or any help linked with the study of contact algorithms for reduced structures with component mode synthesis (Craig-Bampton or Craig-Chang-Martinez). Could you please tell me if you know anything about it ? Thank you. Alain
  11. alain10025

    component mode synthesis

    Hello, I am working on component mode synthesis for the study of plane engines. I am looking for the mathematical theory behind methods such as the Craig-Bampton method or the Craig-Martinez method. I know the way these methods are working but I am more interested in the studies of new modes...
  12. alain10025

    C3D15 and C3D20R elements

    The problem is that I am working with a structure with these two kind of elements. I know how to extract mass and stiffness matrices from an .inp file with Abaqus but if it doesn't work with these elements so I think these elements are incompatible with the Abaqus keywords "Element Matrix...
  13. alain10025

    C3D15 and C3D20R elements

    Hi all, I am just wondering if someone is working with element C3D15 or C3D20R, could these elements create some problem for extracting stiffness and mass matrices ? Thank you. Alain
  14. alain10025

    How to obtain mass and stiffness matrices with Abaqus

    Ok, thanks a lot ! Alain
  15. alain10025

    How to obtain mass and stiffness matrices with Abaqus

    The problem is that actually I can't found what is "elset" linked with... I can't find in the Abaqus help file where "eleset" needs to be specified.
  16. alain10025

    How to obtain mass and stiffness matrices with Abaqus

    Hello, i am working with Abaqus and I am trying to obtain the mass and stiffness matrices of my structure. I know the command to use in the .inp file but I have problems using the "ELSET" keyword ... Could someone help me ? Thanks a lot ;) Alain

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