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sprash

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  1. Recently we installed Hyperworks 12.0 on our office machines.On one machine we are facing an issue with Hypermesh, where the nodes are not getting displayed at all - not just temp nodes of an FE model, but even newly created nodes. Please note that we are able to select nodes by ID, diplay node numbers & even using 'count' function we are able to count all nodes in the FE Model - the problem is that Hypermesh is not diplaying them, i.e. we are unable to see the round yellow dots representing the nodes. This issue is however limited to only one system - on other machines it is working fine. Can anyone help us know what is causing the issue & how to fix it?
  2. When you are requesting Stress output from a solver, which one do you give consideration to - Element centroidal stress OR Maximum Nodal stress OR Averaged Nodal stress? Which one in your opinion gives best correlation with strain-guage test data?
  3. Are you running BatchMesher with a network license? If so, then you will get this error (Geometry not found) when BM is unable to get license. Check the other log files or status files, in one of them it should be written "License not found" or "License not available".
  4. Hi, I am unable to understand the issue you are facing. If you were able to mesh the semi-circle with 2nd order quads (without encountering any trias) then you should be able to mesh the same way with 1st order quads as well. In any case, if you want to avoid trias in your quad mesh, then make sure that the sum of element densities on the boundaries of the surface you are meshing is an even number. It would be helpful if you could post a snapshot of the issue you are facing, so that I can help out accordingly.
  5. How do I connect two similar meshed surfaces fully using Rod elements? The exisiting 1D->Rods panel is useful for creating one rod element between two nodes, but my meshed surfaces have more than 100 nodes on each, in which case it becomes very difficult to pick each pair of node to create each single rod element. Is there are a macro or utility in HM that will help me create rod elements between two matching meshed surfaces in one go itself?
  6. Hi, it depends on how you are planning to model your assembly - i.e. are you modeling only the target shaft, on whose cylindrical face you are planning to give the bearing load? Or, are you modeling a whole large assembly which includes the target shaft, bearings model, source shaft and other components & that you are giving the force or moment to the source shaft and want to check the effect/stresses on the target shaft? In the former case where you are simply modeling the target shaft and you know the force applied by the bearing on it's cylindrical face, mesh the shaft while ensuring a uniform symmetrical mesh is applied on the bearing-contact face. At the bottom-most node of this face, apply the max force & at the end nodes apply zero force (or no force at all). For the remaining nodes in-between them, calculate a parabolic curve y=A*(x^2) with force on y-axis and node position on x-axis with which for each of the in-between nodes you will get the force values. Apply these forces at those respective nodes. Note that the direction of the forces must be normal to the cylindrical face at whichever node they are applied to. Check this article for reference: http://help.solidworks.com/2010/english/SolidWorks/cworks/LegacyHelp/Simulation/LoadsRestraints/Bearing_Loads.htm In the latter case of a large assembly, where you are modelling not only the target shaft - but also the bearing, source shaft and other components, you need to model the bearing with Rod elements. To do so, first delete the bearing's 3D-model from the assembly. Then while meshing, make sure the cylindrical contact faces of both the source as well as target shaft have uniform, symmetrical & MATCHING meshes. Then, connect each of the matching nodes on the source and target faces with Rod elements (Go to 1D panel > rods, choose element type as CROD). Then, you can apply the forces at respective assembly locations & submit the FE model for analysis. The Bearing effect will be automatically simulated by the Rod elements & you can check the stresses or forces on the target shaft as necessary.
  7. Great ETG! That works. Just as you said, I got the list of frequencies from the f06 file under the EIGENVALUES table in "cycles" column. Again, thanks very much for your help.
  8. Whenever I run a Modal/Frequency Analysis (by assigning appropriate EIGRL load collector card in Hypermesh), and open the result file in Hyperview - I am able to view the list of various Frequencies/Modes in the form of a Drop-down text box and by clicking each item in there, I am able to view the result for that corresponding frequency. Now, my question is how can I obtain this list of all frequencies in a text file or text format? It is particularly necessary for me because I have to prepare a Report (in Powerpoint format) for the analysis, in which I need to be able to list out all the frequencies and their modes. As the frequencies are listed only in a drop-down text box, it is inconvenient for me to manually note down down each frequency & type them individually into my PPT slide (particularly as my analysis has more than 50 modes). Is there a way to obtain the list of these frequencies in text format, so that I can easily copy-paste the same into my Report? BTW, I am running the analysis with NASTRAN solver.
  9. I've found the solution to the problem, thanks to the Altair support team: The holes text file should be saved in CSV format & it should contain a list of the special holes' serial nos. (optional) & their centres' co-ordinates as decimal values separated by commas. For e.g, my "holes.csv" file would look like the following: 1,-20.0,10.0,0.0 2,30.0,0.0,-40.0 Now BatchMesher recognizes the file format & applies the special holes' settings successfully. I've requested the Altair Support team to incorporate the above details in the BatchMesher Help Documentation, so that it can be beneficial for other users.
  10. I have a question regarding a special Geometry Cleanup setting available in the Parameters file that allows the user to specify the co-ordinates of certain holes that need to be treated in a special manner (i.e. with respect to washer diameter, # of elements etc. that are different from the general holes' settings). I have a 2D model with several bolt-holes, most of which come under a common setting (no. of elements & washer dias) - but a few need to be treated differently. I have prepared a text file with a list of the special holes' center co-ordinates & I have specified the file path in the Parameters dialog box (under Geometry Cleanup > "Use file for Hole recognition" > Browse...) and in the immediate below table I have assigned the special settings for the holes & saved the Parameters file. However, when I submit the model for BatchMeshing, it gives a warning saying the file (i.e. the holes list) is not in correct format & hence the general holes' settings will be applied for all holes. Can anyone tell me why it is not recognizing the text file? Is there a special format for the holes file that needs to be followed? I tried looking up the BatchMesher Help documentation, and while it does say that the special hole recognition setting exists in BM, it does not mention about what the file format should be like nor could I find any example or tutorial on the same. Your support in this regard will be greatly appreciated. Regards
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