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Found 23 results

  1. Hi, I am new doing heat transfer analysis with OptiStruct, and I need to solve the following problem: 2 coaxial cylinders (see image below) The inner Surface of the external cylinder (blue) is generating a heat flux, which makes to increase the internal cylinder temperature (by convection). I need to know the temperature of the small cylinder (yellow) and I don´t know how to proceed to solve this kind of problems. What are the guidelines to solve this problem? Thanks in advance!
  2. Hello everybody, I am a new user for solver optisrtuct. (In past I am used Intes Permas). I have a problem combine load patterns in optistruct. For example, I have working load and i would combine with pretention load. see below picture. How to do it like this in optistruct.
  3. Hi, I'm wondering if there is anyone who can explain to me : How to export or extract the stiffness and the mass matrices to an ASCII file. For now, I get *k.op2 and *m.op2 and I don't know how to read them or to use them to convert the matrices to an ASCII file. I saw that there a pyNASTRAN package to post process those file .... It's my plan Z. I'm looking for a 'Smart' way to do it without using python or other code. Thank you in advance, Cheers,
  4. Hello there, I've been trying to optimize a simple aluminium structure, using Optistruct. After defining all needed steps, I start up the optimization and the solver asks for 15GB of RAM to solve the problem. This seems to be a little too much, since it is an easy optimization. The first iteration takes a long time to run and after that, the solver just freezes. How can I solve this? I will add the .fem file. Thank you, JRego DV_EBS_05_01.hm
  5. Hi! I would like to make a transient analysis with temperature. I mean: Going for example from 17 to 23 degrees of the temperature of a body in 1 hour. Making steps of 10 minutes for example (total of 6 steps). I tried to do it with TABLED, TSTEP and creating a temperature LOAD but it doesn't work. It says : " *** ERROR # 2094 *** EXCITEID on TLOAD1 # 17 data references follower force or nonexistent DAREA/static loading with ID # 16." Could you help me? Big thanks in advance
  6. Hi! I get this error when trying to run Optistruct "ERROR: Starting Run Manager in read-only folder. Please change "Start in" location in Properties of solvr icon/menu and/or move input file to a different location" I've moved it to many different places and still get this error, plus I don't see where to change the "Start in" location. Thanks in advance!
  7. Hello, I was wondering how can I obtain the .OP2 or .xdb files needed for submodelling by the Post by displacement option in HypermeshOptistruct? An imaga was attached. Thanks in advance.
  8. Hi, I am performing a thermal analysis with ambient temp at 25 and temp loading at -40 along with Gravity loading in Z direction. I have been able to run Gravity loading with Grav card and individual load case. And thermal loading with TEMPD in for -40 and 25 and creating loadcase with TEMP being ambient temp and TEMP_LOAD being loading temp of -40. I would like to see combined effect of gravity and temp as loads !!1 Any suggestion would be helpful. Note: This is a full vehicle and SPC is PARAM, AUTOSPC.
  9. Good morning! I'm trying to model the 4 cables shown in the attached file. At first I thought of using Beams to make it easier but the fact is that those cables cannot transmit moment (rotation) in the joints (2 joints in each cable). How should I do it? Do I change the element type? Is there any way of erasing restriction of the rotational DOF at the joints? Hoping a quick response and thanks in advance! Conjunto tubos.STEP
  10. Hi Everyone ! I want to modify the coordinate of NSET, but the problem is : I can't make the difference between x-coord, y-coord and z-coord !!! Any idea or solution ? Best regards,
  11. Hello everyone, I'm trying to set up a direct transient analysis of the beam you see in the picture below (simplified geometry): The beam is meshed with tetra elements. On top the beam is constrained in all dof. In the middle of the beam is a hump and the mass of it has an influence on the eigenfrequency of the beam. At the lower end of the beam a periodically enforced displacement in the range of the eigenfrequency (3 kHz < f < 4 kHz) of the beam is applied. With the FE analysis I want to get information about the following questions: What is the stress at the top of the beam? Later I would like to get information about fatigue. What is the eigefrequency of the beam? What is the exact displacement of the hump in the middle of the beam when a certain displacement is applied at the lower end with its eigenfrequency? So far I've tried to adapt the tutorial "OS-T: 1310 Direct Transient Dynamic Analysis of a BracketOS" to my purposes but I have problems with applying the periodically enforced displacement. Can someone tell me what the best way is to realize this problem with optistruct? Thank you in advance Felix Link to the tutorial: https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/direct_transient_dynamic_anlaysis_bracket_r.htm#direct_transient_dynamic_anlaysis_bracket_r
  12. Hello Everyone, I would like to know what is the difference between Elemental System, Global System, Analysis System. I am interested in this since hypermesh allows to extract (strains,stress,element forces etc) from each of these systems. I regularly use the one that is by default "Element system" but I want to understand what is the difference between them and what can I obtain different of each of them. Thank you for your time!
  13. What behaviour difference do these rigids make them different from each other?
  14. Hi everybody Is there anyone here who has tried to model and run contact simulation using rough surface (see the picture ) ?? Cheers,
  15. Dear all, I'm working on a project as the attached image shown: We want to increase the natural frequency of the blue plate by design reinforcing components attach to the plate. Therefore we set up a design space (green block). The objective is max mode 1 frequency of the whole model, and constraint is max 0.5 volume fraction of the design space. However as the second image shown: 1. Mostly only the element on the edge of the design space are left, and it's easy to understand they WON'T help to increase the plate natural frequency at all; 2. The mid elements circled in black are "floating", meaning they are not attached to the plate at all. Could anyone help to figure out what I may do wrong in the setup? Thank you, Peter Door_opt_Topo_Opt.hm
  16. Hi, Is it possible in Optistruct to optimize a model and then afterwards analyze it for certain stresses? (run optimization and then run analysis on the optimized shape) I have created a shape with certain forces and stresses and optimized it successfully for minimum compliance & constrained volume, but I would like to analyze the optimized shape for stresses in several different locations of the shape.
  17. I asked this question before in the forum but I am open to hearing new suggestions. In Ansys and Abaqus solvers I Used to apply a "Skin" (2D elements based on the outer surface of 3D elements) on castings in order to read superficial stresses in Hyperview. These elements were membrane elements and were declared different than regular shell elements. (.01 thicknesss shell elements) For Optistruct which type of element is the one suited as membrane element? Is there any other approach to read superficial stress on castings? Thank you!
  18. Hi all, This question may be reasonably straight forward to answer (it isn't a trick question at all). When I perform a hyperstudy optimisation study with plate thickness being the variable. Is it possible to dictate what thicknesses I want hyperstudy to investigate? For instance, I have a structure with a plate where I want to know what thickness I can reasonably use without going over a stress limit but I also know that the thicknesses available are 5, 10, 16, 20 mm. How do I get hyperstudy to only look at those values? Cheers Andy
  19. Hi everybody, I am a new user, and these are my questions: How can we modify the direct method to adjoint method? How can we access and print the values of built-in adjoint-based sensitivities at each iteration? Also, Could we change the sensitivities and feed them to OPTISTRUCT instead of the default re-built ones? I am looking forward to hearing from you.
  20. Hello, I have a simple question: While selecting boundary conditions I have the option to select SPC or SPCD? What are the differences between them? I have used SPC to force initial displacement or rotations of nodes. What makes SPCD special? what can i do with them. <Thanks in advance!
  21. Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
  22. What is strain energy and contact energy? What does contact stabilize in expert NL card do? What is the difference in using CNTSB in ExpertNL to using the CNTSB card as load collector and adding it to the load step. Thank you!
  23. I am using HM 17.2 (Optistruct) and have no Radioss. My problem is using Contact in Optistruct. Somehow I can't get the result I am expecting because of the problems I have in my model. The contact doesn't seem to function the way I want it to be. There are errors that I don't get. Some errors are: *** INFORMATION # 4739 The structure of surface-to-surface contact element is quite different than that of node-to-surface contact element. No internal CGAP/CGAPG elements are created for surface-to-surface contact. *** INFORMATION # 3433 MUMPS solver is used by default for nonlinear analysis at subcase 1. I have only 1 version of HM and have only Optistruct too. Educate me please JDN_Loading_Beam_Rev_B2.hm
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