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Found 663 results

  1. Hi I am performing a heat transfer simulation (steady state). The model consists of 2 plates joined together by a glue connector. One plate is heated up, the other one is at the ambient temperature. The problem I have is that when I look at the result, the RBE3 elements seem to act as insulators (see image below), the bottom surface is hooter that the upper surface, the blue region is the glue. I know it is possible to specify a thermal expansion coefficient for these elements but is it possible to specify a thermal conductivity value as well? Looking forward to your replies Toon
  2. Hello everyone, Regarding some Shock's analysis demands, I've decided to facilitate and automate (using Activate) the task to obtain the expected Shock Response Spectrum curve as below: This model will be very useful for those who are intending to do some Shock's analysis, even a linear approximation using the amplification factor on a certain frequency, as a Response Spectrum covering all the frequency domain. Basically the inputs are the Half-sine and System properties: Sine: Magnitude, period, phase. System: Mass, damping, stiffness. After set them, you'll just have to click 'Run' and then 'Execute'. Besides the traditional plots (Acceleration (G) vs. Frequency (Hz)) you will already have the 'TABLED1.fem' to be used on OptiStruct, as can be seen in this video. Thanks for @robertavarela, @RoKet and @Adriano Koga for some tips regarding the modeling. Hope this be very useful for you all! Please, let me know if you have any question about this model (attached). João. Srs_curve_model.zip
  3. Hello, what does this error message means? *** WARNING # 4961 Reference stiffness underlying contact 1 is 9.860277e-11 times the average diagonal stiffness of the global model. I have TIE, SMALL friction and FINITE friction surface-to-surface contacts in my model. For all of them this error message appears after changing geometry and mesh. In the same model with a slight other geometry and before remeshing, these errors didn't appear. All i did was reassign the contact surfaces to the new mesh. Defining the contacts totaly new didn't helped. Tank you very much for your help! With kind regards Tim Winkler
  4. Greetings, I am performing a free-size optimization of an insert. The thickness of the insert is chosen as the design variable. A minimum and maximum value are set during the DV definition as sown below: However, what value of the thickness does Optistruct choose as the initial guess value for the first iteration?
  5. Model Checker is a very useful tool embed in HyperMesh that performs a series of verifications in your model in order to catch most common errors even before submitting the model to run, as it may take some time to export it and then launch it. To Load the ‘Model Checker’: [HWx and HM Desktop] Ctrl+F >> ‘model checker’ [HM Desktop] Tools > Model Checker Once it is open, you can perform a check by right-mouse click (RMB) and click ‘Run’. Model Checker will verify your model considering the most common ERROR and WARNING scenario for your solver.
  6. Hello, What is the difference between JOINTG Reaction forces and Element Stress (1D)? To what i have seen they dont match, when I extract one or another, their magnitudes are not the same? so, what of each of this mean? thank you!
  7. Hello, i am performing a topographie optimization of a hat-shaped beam unter 3-point-bending with HyperMesh and Optistruct. My aime is to minimize the compliance beneath a certain value (objective minimize compliance, constraint compliance < 14000), without exceeding a certain mass (constraint m < 0,000553) In the optimization controls i have limited the maximum number of iterations to 100 and the convergenze criterion to 0,000001. When i start the optimization, optistruct only performs the inital analysis and one optimization-iteration. The compliance of this one and only optimization-iteration is lower then the inital compliance but higher then the desired compliance. Why does optistruct dont perform additional iterations? Thank you very much for your help! With kind regards Tim Winkler
  8. Dear All, I try to do simple heat transfer simulation by following OS-1385. when I run the simulation I got Error 1000 message, I know that the CGAP material does not have material, but in the OS-1385, the CGAP also doesn't have material too. Please your advise. Best regards, Iron_man CASE01.fem
  9. Hello, I'm trying to run a non-linear static analysis with Optistruct 2019. However, I always get this error message: *** INTERNAL PROGRAMMING ERROR *** in file "malloc_1.c", at location # 723. Dyn_array failed allocation for 2.528657e+03 MB Thank you in advance. Julian_OTM_mitBohrung.stat Julian_OTM_mitBohrung.out
  10. Hello, i have a curved shell-geometry on which i like to reorient the nodal coordinate systems to follow the curvature. I only like to do that for the nodes on the edge. With that nodal systems i like to assign rotational boundary condition following the curvature of the shell-geometry. I am using OptiStruct for Solving. How do i proceed to achieve this goal? Thank you very much for your help! With kind regards Tim
  11. Hi! When performing size optimization I am getting this error message. I have read on this forum two possible explanations but both aren't correcting my error. Please let me know what to do. OG rotor UofT model 1.hm
  12. Hello, could anyone help me to create the mass-spring-damper models in optistruct?
  13. Hello, I have few questions regarding spring in optistruct. 1. How can I load a Cbush o cbush 1D? I know how to stablish the spring K but not a load. 2. Can I choose the direction of the load? Thank you!
  14. Greetings, I have a FEM model whose mass calculated by Hypermesh (under Tools > masscalc) is equal to 2.22 kg I am running a free-size optimization of this model. From the design parameters summary reflected in the *.out file (shown below), the sum of design and non-design mass is equal to 2.51524 kg: After the iterations begin, the mass registered in iteration 0 is 2.34766 kg Question: Is it wrong to expect the following: FEM mass = (design + non-design mass) = mass at iteration 0? Why are these values different?
  15. Greetings, I am performing a free-size optimization (iteration summary given below) and trying to understand the explanation behind maximum constraint violation %. So far the following is clear: If constraint violation > 1% : status is V (violated) If constraint violation < 1% : status is A (Active) Large constraint violation % could mean that the constraint is too tight and that the problem itself is ill-defined. the difference between regular and soft convergence is understood as well Problem definition: The thickness of an insert is defined to be the DV. Two stress constraints are defined. The objective is a stress minmax formulation. Question: I am unable to figure out whether the large constraint violation % implies a critical issue. If yes, how does one rectify the problem? Insert_FEM_y.out
  16. 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
  17. 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
  18. 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.
  19. 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。
  20. 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
  21. 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?
  22. 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,
  23. 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
  24. 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.
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