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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 13 results

  1. How to create design and non design geometry

    Hi, I am trying to optimize the design of a control arm of suspension system. For that reason i have modeled the design in NX and exported in IGES format for HW-Hypermesh. Now for my optimization i am concerned with topology optimization of the yellow(design region) part of the arm. The green (non design) region is not to be optimized as per my design requirements. I used the organize command to move the design volume to design component and other to non design component, but while creating a mesh i am having issues. When i mesh the non design region using 2D mesh it got successful (non design mesh.png) after that i make design component as current and mesh it volume tetra mesh 3D, but it is meshing the complete part including nondesign space (design space mesh.png) Kindly check the issue.png about what i am saying. Please assist me in solving it and also once the meshing is done how to combine the design mesh and non design mesh so as in analysis and optimization it should behave as a single unit? The .hm file can be accessed from this link( https://www.dropbox.com/s/pujyaajiumo6zx9/suspension_arm.hm?dl=0) Thank you
  2. Hello all, I am trying to create rbe3 element with 1.0 weight to independent nodes , however, following code generates 0.0 weight for independent nodes. my tcl code is ; ################################################################## *createmark nodes 1 "by sphere" -341.255 -75.946 6.482 0.25 inside 1 all 0 *appendmark nodes 1 "by face" set rbl [hm_getmark nodes 1] set nrbl [llength $rbl] for {set i 0} {$i < $nrbl} {incr i 1} { lappend dofl 123456 } *createarray $nrbl [puts $dofl] for {set i 0} {$i < $nrbl} {incr i 1} { lappend wgh1 1.500000 } *createdoublearray $nrbl [puts $wgh1] *createnode -341.761 9.994e-02 1.549 0 0 0 *createmark nodes 2 "by sphere" -341.761 9.994e-02 1.549 0.2 inside 1 all 0 *rbe3 1 1 $nrbl 1 $nrbl [hm_getmark nodes 2] 123456 0 ######################################################################## At the end of the day, I want to generate following RBE3;
  3. ERROR # 772

    Hi All, I am trying to run an analysis on a pipe section subjected to torsion. When I run the analysis I get the below message ***There were 4 error messages during input processing*** The first message is repeated below: *** ERROR # 772 *** It is invalid to use a free grid as an independent grid in RBE3 data. Free spiders are not allowed to be independent grids in RBE3 data. RBE3 id = 4903 free grid id = 9634 weighted components = 123 You should remove this grid from the RBE3 data. *** Run terminated because of error(s) in the input data. Does anyone have any advice to resolve this error? Thanks in advance, Luke
  4. RBE 3 and RWall

    Hi, is there any problem in using rbe 3 and rwall in the same model? The system having shell elements, rbe 3 , rbe 2 etc. ,is not facing any impact with rwall. and just goes oninto it without energy absorption. Kindly let me know about this.
  5. Difference between RBEs and CE_STRUCT

    What is difference between RBEs and CE_STRUCT in Hypermesh. Can I use RBE3 instead of CE_STRUCT ?
  6. Hello, I am trying create rbe3 elems using TCL *createmark nodes 1 101 102 103 104 105 106 *createarray 6 123 123 123 123 123 123 *createdoublearray 6 1.23 1.23 1.23 1.23 1.23 1.23 *rbe3 1 1 6 1 6 100 123456 1.23 In this, How do I calculate weight factor which is in *createdoublearray?
  7. different connectors

    Hi guys, can someone say me what are the properties of the different connectors. Or give me a link where they are discribed, sadly i found nothing in the Help or web.
  8. ERROR # 173

    Hello everybody, " my name is Dean and i have a Problem with RBE 3. Doing the check-analysis I am getting always the error # 173 saying that " A dependent d.o.f. defined more than once in rigid element entry. GRID ID = 214823 component = 1" I have checked the elements for dependency and the browser tells me, that there are no elements with double dependency. Besides I tried to delete the node, but the error is the same. I as well checked for the node with the find function, with the result, that the centre point of the rbe3 element was meant. I would be very thankful if somebody could help me, because I am pretty stuck with this and need help pretty urgently. Kind regards and thank you for your help in advance Dean
  9. In my model, I am attempting to use RBE3 elements as supports to avoid artificial rigidity imposed by RBE2s. Because a support cannot be attached directly to an RBE3 element, I am trying to create a zero length CBUSH element with high stiffness, as suggested in this help document. However, since the CBUSH element is a spring that requires two nodes to be specified, I don't understand how to achieve zero length without selecting the same node for the ends (which gives the error "The independent and the dependent nodes are the same"). This post indicates that it is possible to create coincident nodes, but when I attempted to create a temp node at the same location as the center of my RBE3 (Geometry -> nodes -> x,y,z), it fails to create a distinct node that I can select in the spring creation panel. My questions are: Is it possible to create coincident nodes? If so, how is this done? If not, how do I create a zero length CBUSH element?
  10. I am using the function sewing tools function from Aerospace module. I have a doubt. How can I verify whether all the GFEM are attached to DFEM? via RBE3. Thanks.
  11. Hello, in order to get a smooth stress distribution with no spikes, my plan is to constrain a surface with RBE3-Elements to an SPC. Since it is not possible to directly connect the dependent nodes of the RBE3 to the SPC I thought I could use a spring (cbush) between the RBE3 and the SPC. As long as K1 and K4 of the pbush property of the spring are rigid my simulation runs. But obviously the spring will be deformed when K2, K3 K5 and K6 are zero. Nevertheless I get a smooth stress distribution. Making all six Ks rigid gives me an error. Using an RBE2 directly connected to an SPC gives me spikes. So my questions are: - how can all 6 Ks of the pbush be rigid without getting an error? - how can I connect an RBE3 to an SPC (is there a better way than using a rigid spring)? The attached screen shot shows the problem. Thank you in advance. Felix
  12. RBE3

    dear users, can we use RBE3 with radioss (hypercrash) ? my objectif is not too regidify elements related to slave nodes. Thx
  13. What is difference between Constraining nodes(directly from analysis->constraints) vs. rbe3? I am trying to do tensile test using Ls-dyna solver. Please post your comments.