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Found 670 results

  1. Hello, I'm useing Hypermesh for modelling and Optistruct for solving. If I want to solve via the radiobutton: Analysis --> OptiStruct but it just gives me the *.fem file. (Picture below) I can solve via a *.bat file but can't view the results in Hyperview. Only Hyperplay is possible. So I think Hyperview wasn't installed?! But how can I install just hyperview. I installed the edu2017_win64.exe and also got the Altair_lic.dat. I'm using Hyperworks 2017 Student Edition
  2. Hi! I have performed free size optimization and it ran successfully. However I have some questions relating to some of the upper and lower limits and design variables required to enter. After checking the optimization book provided by altair I still do not completely understand in design variable in the parameter option the mindim is what exactly and how to choose it appropriately? As I have chosen different values and it shows different results. Moreover, I chose Volfrac as the optimization constraint and chose upper limit as 0.2 but I am not sure what this represents? As in volume option upper limit showed the volume in mm^3 but volfrac I am not sure what it represents. Another main question I have is that when setting load collectors I can add as many but in Loadstep for load and constraint theres only two options. How can I add two loads and one constraint for my analysis? Please let me know I know this is a long one but your help would be much appreciated. I am attaching my file over here and if you could please take a look to see if my results are appropriate or not? Freesize opt try 1.hm
  3. We are practicing the C-shaped clip of the tutorial to learn Optistruct. The calculation itself with Optistruct is possible, but as shown in the figure, the "HyperView" button is displayed in white and cannot be selected, and the result file cannot be displayed. The software used is HyperWorks 2019 Student Edition. I would appreciate if someone could teach me a solution. Thank you.
  4. Optistruct習得のためにチュートリアルのC型クリップの演習を行っています。 Optistructによる計算自体は可能なのですが、図のように「HyperView」ボタンが白抜き表示になって選択できず結果ファイルを表示させることが出来ません。 使用ソフトはHyperWorks 2019 Student Editionとなっています。 どなたか解決策をご教授いただけると幸いです。 よろしくお願いいたします。
  5. Hi! I am not sure why but when I try to import my geometry from solidworks to optistruct it only shows as a single component geometry while in Ansys it shows as different parts. I want to know how can I have multiple components in optistruct? I am performing size optimization so I need to assign different properties and thickness to different parts of the model. I am attaching my geometry here hoping someone can guide me. Thanks! OG Rotor Proper Meshed 1.hm
  6. 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?
  7. 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,
  8. 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
  9. 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.
  10. 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
  11. 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
  12. 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.
  13. 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
  14. Hi, All: May I ask how can I generate .op2 file in my OptiStruct analysis? Thank you very much for your help.
  15. 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!
  16. 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
  17. 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.
  18. 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!
  19. 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!
  20. 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?
  21. 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
  22. 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.
  23. 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!
  24. 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.
  25. 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.
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