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Turbokraken

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  1. Hello, You're right, I kind of expected this... I had just hoped I was doing some more obvious mistake. I had been searching in this forum and for this importing of loads someone had uploaded 2 files as tutorial where I could learn how it works. Unfortunately they were not available anymore. Is some sort of tutorial available for importing pressures from a .csv? That would really help me understanding my mistakes. Thanks you your help. Best Regards, Lennart
  2. Dear All, I am currently modelling a wing-like structure which generates lift and is of course loaded by a aerodynamic pressure. I have received a list of aerodynamic loads from pressure and suction side, which I transformed into my models coordinate system. My table looks something like this: -85 76 405 1,2 -82 77 410 1,3 -81 77 414 1,4 -81 78 418 1,5 -80 79 422 1,6 I have X,Y,Z coordinates as well as magnitude and its fitting quite well with my geometry, albeit not perfectly. Now if I apply this pressure using linear interpolation to my whole wing, its working fine. However I only need those pressures on one side, which is why I am only selecting the lower face. When I click "create" its calculating and then giving me the message "No pressures were created" without telling me why. Upper side is also not working. Furthermore, when I am looking at the pressure created with the full wing, all pressures have the exact same magnitude, which kind of diminishes the point of importing pressure loads. Have I completely misunderstood the input data I need or is there something else going on? unfortunately the model is classified and I cannot share it, but I hope someone of you knows what has been going on. Thank you for reading this far and best regards, Lennart
  3. Dear Rahul, Thank you for your answer. It appears that I could find the reason it did not work so far: Unfortunately your idea did not work, the DRESP2 was already referenced in the objective. (Although I did put an extra constraint with a high upper limit just to be safe) What did work though was reducing the number of elements to 1. Which kind of makes sense because in the formula I would ask to subtract S1 and S2, which in that case would have 10k+ values. Which brings me to my hopefully last question: Can you think of a sensible way to get an average value of all the elements in a specific region/part/property?
  4. Dear All, I have unfortunately not been able to solve the issue on my own for now. However I have an assumption on what the issue might be: S1, S2, etc. are defined as responses of "static stress" of multiple elements. Is the response automatically creating an average value, or a maximum value from the huge amount of stresses from the 10k+ element? If not, it would explain why simply adding and multiplying a whole array of stresses may not be working. Is there any other way how to create the average or the max stress from an array of stresses? Best Regards, Lennart
  5. Hello Everyone, I am trying to do a rather weird optimization: I have multiple structures which are all held in place by a single master structure. I want to optimize the master structure so that all sub-structures receive roughly the same stresses. For this, I have created 5 responses, each possessing the static stress of about 10k elements which is one sub-structure. Then I created another response, called GlobalStress, which possesses a dequation. This dequation shall then use and weigh the difference of the stresses in the sub-structure, e.g. S1 - S2, S2 - S3 and the resulting value shall be minimized. Which is why the objective is to minimize this response. The dequation looks something like this: StressG(S1,S2,S3,S4,S5) = (ABS((S1**2)-(S2**2)))**2+(ABS((S2**2)-(S3**2)))**2+(ABS((S3**2)-(S4**2)))**2+(ABS((S4**2)-(S5**2)))**2+(ABS((S5**2)-(S1**2)))**2 Now what is bugging me is this: In the DRESP 1/2 L card of the response with the dequation, I put in the response list all responses from S1 to S5, as they appear in the dequation, too. However when I start the optimization I get an error saying the following: *** ERROR # 1810 *** Inconsistent number of responses on DRESP2 card 22. Which I frankly dont understand. Unfortunately I will not be able to share the model, as the content is protected. Is there an obvious mistake that I did? it is my first time working with dequations and I may have missed something. But why are the number of responses inconsistent? Best Regards, Lennart
  6. Dear Rahul, thank you very much for your answer. I still could not resolve the issue, even with reviewed material constants. Could you elaborate on what you mean with my BCs? (I assume you mean SPC?) I do have free nodes there but those where just for designing the part. BR, Lennart
  7. Dear Everyone, I am have been working with the shell modelling of composites, using the PCOMP-card and plies and laminate definition. I wanted to take it to the next step and try the modelling of composites using 3D elements. I have looked into the Shell to Solid Conversion of HyperMesh first and then started on my own using the PCOMPLS card. I modelled the exact same plate twice to see if I can re-do my 2D results in 3D. However I came to find that both results are vastly different. Do you know how this could happen? Displacement of 111 vs. 37... I have attached both of my files, could any one of you please have a quick check? Any help would be greatly appreciated! Best Regards, Lennart Winkel_2D_Platte.hm Winkel_3D_Platte.hm
  8. Okay, it kind of got solved. For everyone who has thr same issue. The System or the Mateial orientation dialog does NOT work for this. (2017.2) However you can create a coordinate system und put it into the property as CORDM. Select "USER" and choose the coordinate system. The materila will orient itself around the X-axis.
  9. Dear Rahul, thank you for your fast answer. I am using HyperWorks 2017.2, so this cannot be the issue... Best Regards, Lennart EDIT: I appended the HyperWorks-Model, perhaps you could have a look yourself? Block_Uebung.hm
  10. Okay, so this is starting to get more and more complex. I remeshed to have perfectly cubic elements, but appearently they also seem to have an induced chaotic material orientation.
  11. Hi Rahul, this unfortunately did not help it. I am using this dialog box to create a material orientation, but when I click apply nothing happens. EDIT: I select all Elements. I use orientationmethod by curve I choose a line I click apply and chaos ensues, just like before. EDIT2: I have created a coordinate system uznnd tried to reference the vector using its 2-axis (y) an it just creates the same mess, although i looks differently.
  12. Hi Everyone, I started playing with MAT9ORT cards to gain an ansight on how to work with this material type. However for this, I'll need to assign a normal direction to my solid, but I am struggling to do so. I am using Analysis -> System -> Material orientation and try to align it with a vector / y-axis, but it does not work. It just shows like this: Please refer to the picture for details. How would I prepare my solid for a MAT9ORT use? Best Regards, Lennart
  13. Dear Rahul, I have copied two sections from the .out File that I believe are important: *** WARNING # 1376 Field 11 in MATT8 2 defines temperature dependence, but the same field on MAT card is zero or blank. Respectively, this zero value will be processed by the temperature-dependent tables. With TABLEM1, the value will be replaced by the table value. With TABLEMi(i=2,3,4), the value will remain as zero. *** WARNING # 1377 Temperature-dependent materials are present in Linear Static subcases without SYSSETTING,TLOADMAT,1/2. TEMP(BOTH) or TEMP(MAT) (depending on their order) will be used to update material properties for temperature-dependent materials in linear static subcases. If TEMP(BOTH) and TEMP(MAT) are not present, then TEMP(INIT) is used instead. Does the last warning tell me that that for the linear static subacase I need to make additional adjustments?
  14. Due to this work being confidential, I unfortunately cannot share it...
  15. Hi Everyone, ok small update here: I managed to put in a table (TABLEM1) and entered my temperature/CTE data points. I also activated the required MATT8 card in the material card. But no matter what I do, the MATT8 card is ignored. What type of load step do I need to use? Right now I am using the "Generic" One.
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