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Found 666 results

  1. Hi I am doing some test calculations in optistruct. I have a very thin plate with basically no mechanical strength and stiffness, attached to a plate with moderate strength and stiffness. When I heat up both plates I get deformations due to thermal expansion which are expected. Now when I only heat up the very thin plate, the deformations due to thermal expansion are higher compared to the previous case (so also the thick plate now has higher deformations even if it is not thermally expanding). This made me wonder the following: is material stiffness is neglected in a thermal expansion analysis?
  2. Hi I have a general question. I was wondering how springs are modeled. For instance an assembly that consists actual spring. How they should be modeled modeled? should the spring be meshed or it should be replaced by specific type of element? what kind of analysis is usually performed? what are the inputs and out puts? Is there any tutorial related to spring modelling? I appreciate if you give me some explanation in this regard. Thanks,
  3. Hi all I want to calculate deformations in a solid due to thermal expansion. I calculated the temperature field in a CFD solver and now want to use this temperature field in Optistruct in a thermal expansion analysis. I have used the linear interpolation under BCs>Create>Temperatures but when I ran the simulation no displacements were calculated. I discovered that apparently the linear interpolation tool only works for shell elements (while I have a solid with solid elements obviously) so I think this has something to do with my problem. My question is: How would I import a temperature map to my thermal expansion simulation (with a solid) in Optistruct? Is there another way? Looking forward to your ideas Toon
  4. 01 OG RotorHi! I am really new to this software and facing a lot of issues. I am currently performing size optimization on my model but it is showing some error. I read online that if I choose PSEHLL as my property it should cancel the error but it's not working. Please help I have attached my model file in this message.
  5. Hallo Group I am doing Frequecy response analysis following image ie Gobal output control card what does the form field indicate eg real , phase, imagnary, both. Regards Pratik
  6. Hello everyone, I did a 1D topology optimization of a lattice structure (composed of a large amount of PBeamL elements). I want now to perform a Size Optimization of each beam section. Is it possible to generate automatically the design variables (and design variables property relationship), of the lattice structure at this point ? Thank you in advance for the help. Nathalie
  7. Hello, I have been trying to assign a local coordinate system to a group of constraints and my model so that I can load it in a direction specified by the local coordinate system. Therefore, I believe I need to use the Mesh>Assign>Node Analysis System and BCs>Assign>Load Reference System for all my constraints and model nodes. However, when trying to assign the Node Analysis System, only "set displacement" works. "set reference" gives an error saying that "Nodes defining a system cannot be assigned to it". I have a feeling this is why my Optistruct simulation is quite bad. Interestingly, I tried the same method on a very simple box model in a separate model, and created a coordinate system using the nodes of the box. I was able to "Set reference" without a problem, and I could see a clear change in the OptiStruct displacements to the new local coordinate system. I am wondering why my other model does not allow me to set the reference. Any advice is very appreciated.
  8. Hello, everyone, I have a question regarding RBE2 elements.I wanted to compare RBE2 and RBE3 elements. You can see the model structure in figure 1. I wonder why the elements, which are connected to the RBE2 element, are assigned a density of 0 in the optimization result (figure 2) and whether this is a viewing error. Thanks in advance
  9. Hi, All: May I ask how can I generate .op2 file in my OptiStruct analysis? Thank you very much for your help.
  10. Hello, Today I have a simple question: for shell in Optistruct: Z1 = Top Face = Red Face Z2 = Bot Face = Blue Face Is this correct? Thank you!
  11. Hello, how do i request to let Optistruct automatically write a tabluar file after the analysis (non-linear quasi-static), for example column 1 displacemen of a certain node and column 2 SPCF of this certain node? I dont want to do this with HyperView and export graph, because there are to many analysises so i want to do it automatically. The PUNCH file format only writes the results of the last timestep and don`t allows SPCF in non-linear quasi-static. The time history file T01 ist not available for non-linear quasis-static analysis either. Thank you very much for your help! With kind regards Tim Winkler
  12. Hi everyone, I am new to lattice optimization, and i want to control the diameter beam size and have a better understanding of CLEAN option. If i understood well, CLEAN option can be used with MinRad to delete beams under the radii defined in MinRAD. - When i don't touch the lattice parameter panel, CLEAN is set to YES by default and clean beams with very small radii (E-05 mm) at the end of phase 2 - When i use only MinRad (2mm) and CLEAN set to NO, it get all the beams above the radius defined. - But when i use Minrad with a radius of 2mm and CLEAN set to YES, it has trouble creating a feasible design. Is it because CLEAN option only works with very small radii ? It doesn't simply delete beam under MinRad in the end of optimization? For information, my mesh size is 5 cm, and my objectif is to create à structure with big enought beam, but with less beam without changing the mesh. Thank you in advance.
  13. Hello, Is there a way I can have control over how I want the model to be solved? Between Iterative and Direct Method? Can I have control on sparsity matrix? Thank you for your time!
  14. I did some research and saw on Altair Documentation that both Linear and Nonlinear models are solved by Direct Methods, Boeing Solver for linear static and MUMPS solver for nonlinear static, My understanding, and what I see on my .out file, is that nonlinear models are solved iteratively instead of direct as documentation suggests; So, my next questions are: 1) NonLinear quasiStatic is solved in an iterative or direct method? 2) What does the documentation mean that the default solver for non linear static uses a direct solver? Thank you!
  15. I am receiving the following error while trying to run a job on a Linux cluster: (Scratch disk space usage for starting iteration = 2704 MB) *** ERROR # 158 *** Error encountered when accessing the scratch file. error from subroutine xdslrs Solver error no. = -702 This may be caused by insufficient disk space or some other system resource related limitations. Try one or more of the following workarounds if you think otherwise and if this issue happens on Windows. - Resubmit a job. - Avoid writing scratch files in the drive where the Operating System is installed (start the job on other drive or use TMPDIR/-tmpdir options). - Disable real time protection at minimum for files with extension rs~ . - Use of environment variable OS_SCRATCH_EXT=txt may help. This error was detected in subroutine adjslvtm. *** ERROR # 5019 *** Specified temprature vectors (1 - 1) out of allowed range (1 - 0). This error occurs in module "snsdrv". ************************************************************************ RESOURCE USAGE INFORMATION -------------------------- MAXIMUM MEMORY USED 4985 MB IN ADDITION 177 MB MEMORY WAS ALLOCATED FOR TEMPORARY USE INCLUDING MEMORY FOR MUMPS 2929 MB MAXIMUM DISK SPACE USED 5939 MB INCLUDING DISK SPACE FOR MUMPS 3934 MB ************************************************************************ I've tried some the troubleshooting suggestions in the error log without any luck: I've specified the scratch drive to a large file system (petabytes of storage) I've set OS_SCRATCH_EXT=txt Since this is a high performance computing environment, I don't have the ability to access "real time protection" options; however, I'm not aware of any virus protection running on the cluster and, furthermore, the OS_SCRATCH_EXT=txt should fix virus scan issues as I expect the system would let text files pass. I should note that I am trying to run this problem as a parallel job with the following command: $ALTAIR_HOME/scripts/invoke/init_solver.sh -mpi pl -ddm -np 2 -nt 8 -scr $SCRATCH -outfile $WORK <filename>.fem Below are some other relevant notes: If I try to run this job in serial (i.e., without the -mpi pl -ddm -np 2), I don't experience the above error; so, this appears to be something that arises when trying to run mpi jobs. I've tried running this job with -mpi i and my system doesn't seems to be setup for intel based mpi (unable to find required .so files). Cluster node information: Dual Socket Xeon E5-2690 v3 (Haswell) : 12 cores per socket (24 cores/node), 2.6 GHz 64 GB DDR4-2133 (8 x 8GB dual rank x8 DIMMS) Hyperthreading Enabled - 48 threads (logical CPUs) per node The $SCRATCH drive I'm pointing to is a network drive. I tried running -scr slow=1,$SCRATCH, but still get the same error. When I make the above ddm call, I have requested 2x nodes and a total of 48 mpi processes (although I'm not using them all) Thoughts?
  16. Good afternoon, I have a BEAM (CBEAM) component and I would like to see how it deforms due to a VARIABLE TEMPERATURE applied to the whole BEAM. Is that possible? Obviously I would only like to see how it deforms on the direction of it's axis (as a BEAM is a 1-D element). The TEMPERATURE would go from 17 to 23 degrees in 6 hours (1 degree increment every hour) Thanks a lot in advance! Sergio
  17. Hi I am trying to perform a (transient) thermal analysis where a composite plate is subjected to radiation. The plate consists of 2 plies, the one on top is made of glass, the one on the bottom is made of aluminium. The radiation needs to go trough the glass and then reaches the aluminium plate. The aluminium absorbs almost all of the radiation, the glass mainly lets the radiation trough and reflects it. How would I model this? Is it possible to do a thermal simulation like this with hyperworks software, like optistruct or radioss? I already looked at the tutorials but they don't match my case. I also tried acusolve but here it is not possible either because radiation through glass cannot be simulated properly.
  18. Good morning, Could you guys tell me what is the card to put together two TLOAD? For example to put different SPC we can use SPCADD. Thanks a lot in advance!
  19. Hello, I would like to know the center of gravity of a set of elements from my model. Currently I only know how to obtain the center of gravity but for the whole model (post--> Summary) But, how can I make this with a SET? thanks in advance.
  20. Hello, I work on a suspension construction. I have done done a static analysis due to vehicle mass (I managed to do both linear and lgdisp nonlinear). However, I also need to perform a dynamic analyis due to riding over an obstacle and I have encountered few problems with the simulations: 1) As an excitation I use a displacement of a triangular shape (picture below). It works fine for the direct transient (linear), however, when performing nonlinear direct transient (with and without LGDISP on) the excitation is not as I intend it to be (second picture). The plots show the displacement in the Y direction in nodes where the displacement is applied in the model. The actual input load data is a triangle as in the first picture. Therefore, I do not understand why when performing nonlinear transient the displacement starts to increase before it is larger than 0 in the input data. There should not be any loading applied before 0.100 s and when changing to nonlinear analysis somehow there is a loading. Also the system does not go back to the zero position. 2) the second problem is that when i use nonlinear direct transient the simulations calculates without any problem but when turning on the LGDISP option I encounter convergence problems: *** ERROR # 4966 *** Minimum time increment reached, analysis aborted. I tried changing the minimum time increment but it does not help. I use TSTEPNL and NLADAPT setup. What options should I change so that the convergence problems does not happen? Thank you very much in advance for any help.
  21. Hello, What is the difference between CORD2R and CORD3R? What are their properties? If I reference joints to a specific coordinate system what would the difference be with CORD2R and CORD3R? Thank you!
  22. Hi all, I got Windows 10 and the Hyperworks Student Edition 2017. I can start the Hyperworks student edition and create everything up to a model which is ready for the analysis with Optistruct. The problem is, when I try to start the analysis with Optistruct nothing is happening (at the down-left corner something running but it stops on "Ready"). I also read the other topic but that solution doesn't work for me either. I already tried to uninstall and install the program several times to different directories but nothing helps. I am trying to fix this problem for a week now and I'm starting to get desperate. I really need this program to work for a university project and I hope someone can help me. Thanks in advance Spaessel
  23. Hello, I am using an axial joint and want to to add motion to it. My questions are: 1) Which node moves relative to who? a. Node1 Moves and Node 2 Does not move b. Node 1 does not move and node move 2) If i was to assign a DOF = 1 in MOTNJG does this mean that the node moving wil move in the axial direction of my joint? Thank you!
  24. Hi, I want to run a topography optimization of a sheet metal component, but I would like to restrict the shape change with barrier mesh inside and outside due to the adjacent components. How can I do this?. Can someone help me with this concern?. I know that barrier mesh option is available in free shape optimization but I really want to make use of only Topography optimization as it is a sheet metal component. Thanks and regards, Punith
  25. Hi, My loadstep, TSTEP and NLPARM are as follows In the result, the number of the time data is 432. (Its time step is not 0.0001) I learned that when NLPARM and TSTEP are used together, DT on NLPARM overrides DT on TSTEP. This result is caused by incremental load based approach in OptiStruct? Thanks
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