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Found 622 results

  1. I am attempting this tutorial but I am confused regarding the solver manager. I have altered the fem file using the text editor, then saved it with the name: controlarm.fem.txt, which gives it the suffix of a .txt file. But the tutorial then says to run the file in the solver manager. This is a .txt file so it does not work in the solver manager. What am I missing? Kind Regards, Laurence Maskell controlarm.fem.txt
  2. Hello, I have set the DESMAX in the individual model files but when running the MMO it uses a default value of 80 iterations. How can I change this default?
  3. Hi , Is it possible to apply cyclic load in Optistruct Analysis? Regards, Arul
  4. I'am studying how a components performance is affected by the materials isotropic and orthotropic behaviour. The image attached shows the same 3d solid mesh using hexa and penta elements but with an isotropic material (top) and an orthotropic material (bottom). I'am using mat1 for isotropic and mat9ort for orthotropic. There is a clear difference in stress for the cpenta elements compared to the chexa. Are cpenta elements fully supported for mat9ort or is this behaviour a result of the cpenta element formulation?
  5. I am trying to run an example, provided by altair on their help page, about vibroacoustic interaction and wave propagation using infinite elements CACINF3. The link to the page is: https://altairhyperworks.com/hwhelp/Altair/2017/help/os/topics/solvers/acoustic_analysis_of_speaker_os_example_r.htm#results However, I am unable to run the problem using optistruct 2017. The error message given is: The model file follows attached. Speaker_IE-C.fem
  6. hello, i'm triying to to find a solution of a probleme i'v acoutred in the last few days, i'v exported from ANSYS a .cdb, file which i opened with hypermesh and while i'm on the Ansys user profiles every thing seems ok, i got all material propreties, geometri propreties, DOF... but the memont i pass from Ansys user profile to optistruct i lose all my data (no materials defined...), i got only the initial geometry. so i got three questions if anny one got the answers i'll be realy greatfull. 1) is there a way to keep all my imputs when i change the user profiles from Ansys to optistruct ?. 2) how can i define the following matairial propreties using optistruct?: * thermal expansion * permeability * resistivity (constant) * specific heat * thermal conductivity 3) how can i also define a COMBIN14 element type using optistruct? and thank you everyone
  7. Hello. I am working on the NL buckling of a composite panel (geometric NL implicit) and I successfully setup the model and ran the analysis within radioss after automatic conversion from the optistruct input. The problem is that although I specify I need 50 increments (NINC) with PW convergence criteria, the solution ALWAYS converges at 25 increments and of course the total buckling is not captured. Below is my NLPARM card from the .fem file. I am not specifying anything else in the NLPARM card or in any other cards. Can you please help? NLPARM 6 50 0.0 6 50 PW + 0.01 0.01 20 + 1.0 Thank you
  8. hello, i want to define a anistripic material in optistruct and i don't know what card image should be used for such a material. thanks
  9. Hello, I'am optimising a front wishbone for both the left and right of a suspension. My idea is to have the loads and boundary conditions mirrored between loadsteps however there is a spring/damper element that would effect the results. Can you deactivate/ignore elements between the loadsteps? Or is there a better way to combine the optimisation so that the component is optimised for both the left and right tyre loads?
  10. Hi,I have a question, In Optistruct, how to apply a displacement load on a cylindrical rigid wall to simulate a three-point bending test like following picture? Thanks in advance。
  11. Hi , I am trying to restart from the end of a successful nonlinear analysis and append new nonlinear subcase with CNTNLSUB. I have included a new nonlinear subcase to the restart file, While doing so A fatal error has occurred during computations: *** ERROR # 4761 *** The restart model is inconsistent with the original one. Please compare the two input decks. Please help me to restart. Thankyou
  12. Dear All, I am trying to do the tutorial of the rubber spring but when I am setting the analysis load step, I can't find the Analysis type Geom non linear (implicit) Is there something missing in my version of HW?
  13. Hi, I am a new user to Hyperworks. I am trying to analyse and optimize a composite monocoque chassis. I haven't gotten to the optimization part yet as I'm stuck trying to even run the analysis. Every time I try to run the analysis I get the following error: *** ERROR 14: Missing MAT # 3 referenced by PLY # 3, (existing MAT with this ID is of incorrect type). *** ERROR 14: Missing MAT # 3 referenced by PLY # 8, (existing MAT with this ID is of incorrect type). What I have done is that I have a symmetric stack of 2 layers of carbon fiber, aluminium honeycomb and 2 layers of carbon fiber. I have defined carbon fiber as MAT 8 and the honeycomb as MAT9ORT. The property I have specified for the geometry is PCOMPP. I have added pin joints to the rear suspension and a torsional load at the front suspension. I understand that another thread has been posted about this but I don't understand what the replies are telling me to do. Any help would be appreciated.
  14. Hello, I am trying to figure out how to model the heat generation on a brake rotor during braking using Optistruct. Are there any guides that describe this process or something similar to this? How would you approach this? The total energy of the system is known and will be evenly distributed over three brake rotors to stop the vehicle in a given time. Now, I need to model the maximum temperature reached.
  15. Dear all, Is there a way to automatically run OSSmooth and re-analysis with optistruct. Basically up to now we are running an optimisation then going to hypermesh, running OSSmooth, and re-running optistruct to see what deflection we get with the optimised shape.\ Can we set that at once (maybe as a batch process) so we don't have to do the whole thing, and get optimisation + Re-analysis at once? Many thanks.
  16. Hi everyone, Could you help me understand the phenomema that I describe below ? I conducted a non-linear analysis with activating LGDISP. After comparing the results with and without LGDISP, I found that there is a big difference in displacement. If I don't activate LGDISP, the displacement of model is very large. Otherwises, the displacement becomes small with LGDISP. I don't understand this phenomena. Note : In my model, I have plastic material so with small young's modulus , but just linear comportement is taken into account (I don't have informations on parameters for determining its non-linear comportement). I implemented non-linear analysis because of contact phenomena. Thanks for your helps.
  17. Hi, I am trying to do an analysis on a enamelled sheet metal part, it is bimaterial. As initial condition, temperature is 350 celcius degrees and as final condition, temperature is 25 celcius degrees. So, I applied a temperature load. I used MATT1 and entered temperature dependent material properties in TABLEM1 format. I used PCOMP card to model the structure as composite. Materials (Steel and Enamel) are taken as isotropic materials so there is no ply orientation. When I start the analysis with Optistruct, the programme gives the following error message: ERROR 14: Missing property # 2 referenced by CQUAD4 # 1 What can I do to solve this problem? Thanks in advance. Mert
  18. Hi, Where to apply pretension force in pretension analysis in Optistruct. ? Middle of the bolt or tightening area or thread starting area? Pls find the image rgds, Arul
  19. Hi All, Please do register for Altair Multiphysics Webinar series. Click here to register Best Regards, Kamlesh
  20. Hi, I am using Hyperworks (V13) to analysis 1D beam and rod. I used 3 pairs of Rev joint for point 3 as I don't know if there is any better way to join 3 part together. I created 4 bodys as PRBody. I created SIM, force SPC load collectors. But it always give me errors. such as *** WARNING # 1200 Incorrect or inconsistent data found in $HMxx cards. (Obsolete data format or errors because of manual editing.). All HyperMesh specific data will be skipped from input files. Component information in the output file will be missing.To rebuild this information - read back and recreate input file using HyperMesh. This happened in line 197 of file "C:/My_Folder/V2.fem": $ 40 39 38 37 36 35 34 33 32 Force can't be referred. I am really struggling here, Is there any body can help ? Many thanks. Sophie V2.hm
  21. Hi, i am working on my bachelor thesis at the moment, in which i need to simulate the heat transfer absorbed by a laser. Therefore i want to apply different heat fluxes which overlap and run only for 1 second. After 1 second i want the second heat flux to start and also run for only 1 second. How can i do this? Thanks, Erdinc
  22. Hi, I am using hypermesh v13 and optistruct v13 for bolt pretension analysis (Non linear Quasistatic analysis) for 4 cylinder inline engine. Components consist Cylinder head , head bolts , gasket and Cylinder block. Head bolts are inserted and they pass through cylinder head--gasket--cylinder block. Internal threads are present in block and external threads on bolt. will you please tell which type of contact should be used for contact between cylinder head bolt and cylinder block for optistruct solver ? There must be relative motion between them...right ? please give explaination too so that I can understand.
  23. I am trying to use Optistruct for Topology Optimization. I imported a geometry in a STEP file, meshed it, gave it material properties, loads & constraints - However when I click to run Optistruct, nothing seems to process, and no screen appears. I think I am supposed to at least get an .out file to at see the status of my work. When I click "view .out" - it says "out file does not exist" on the bottom left corner of the screen I followed the tutorials from Altair University to get this far. I have also tried uninstalling and installing the program in case it was an installation error. Why am I not seeing anything happen when I click Optistruct? Thank you~
  24. Hello, I am working on a project to simulate the cooling phase in an enamelling process. I simply generated a composite cantilever beam with two different materials to obtain the stresses and displacements during cooling process. I will cool down the composite cantilever beam from an elevated temperature to room temperature. The problem is, I am new to thermal boundary conditions and I can't find the correct load collector combination to handle the problem. To summarize the simulation; 1. Structure is at 350 degrees celcius and it will cool down to 20 degrees celcius. 2. Due to thermal expansion coefficent difference, the composite beam will deform. Thanks in advance! Mert Cevdet Gunay
  25. Dear all, I am trying to define a multi-body deformable surface contact for Optistruct using MBDCNTDS type of interface. Below image shows the doc page for this type of interface. As the docs say, I have made an MBDSRF type node set to use as the deformable surface. I am able to pass this MBDSRF type of set into the SRFID entry of the MBDCNTDS . So no issues with the deformable surface part. However, when I try to make a node set for the SID1 entry in MBDCNTDS, it will not accept any of my node sets which are saved as entity sets. I have tried using many different card images (SET_GRID and many other), still, the SID1 entry of the MBDCNTDS I'm setting up will not see my node set. I would be grateful if you could share any information with me regarding the type of node set I should use which can be passed into the SID1 entry of MBDCNTDS. Relevant info: I'm using Hyperworks 2017 Best regards, Deniz Bilgili
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