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Found 576 results

  1. Hi everyone, I modeled an element in Altair Inspire, then I imported it in HyperWorks as a Solver deck. The mesh is created by Inspire, is there a procedure to refine the mesh o remesh the object? I tried to remesh some volumes, but the longest side of the FEs was not divided. Bests Martina
  2. hello im triying to do a topography optimizaiton using ERP as a response, and a minmax objective. when i try to solve it i got the following error: *** ERROR # 2148 *** Invalid design problem. All the sensitivities of response 1 (objective) are zero.
  3. I have modelled one Cube with conduction at upper side and convection at bottom side.. Material properties are provided with MAT4.. In this case Ambient temperature is referenced with convection elements.... (i)My doubt is how to link the Initial temperature or ambient temperature to Conduction heat transfer .... (ii) how to give the ambient temperature to entire assembly..... ?
  4. Hey guys, I got a question on topology optimization again. I want to set a Stress Constraint for my optimization, how can I estimate a reasonable value for this constraint to avoid getting an infeasible design? Besides, how do I know which of my constraints is hurt when this error is occurring? Kind regards Simon
  5. Hello all, I've been trying to recreate the example problem seen here: https://connect.altair.com/CP/SA/training/self_paced/optimization/content/opt3/pdf/ex1a.pdf But with a couple of modifications: 1. I have written a script to run the model in batch mode, however, the script cannot handle RBEs at this point. I've substituted all RBEs with loads and constraints assigned directly to the surfaces, effectively creating tractions instead of RBEs. 2. The script meshes everything in tetra elements. Everything else should be the same (material definitions, boundary conditions, objective function, etc). I'm thinking that these two modifications shouldn't change the outcome very much, but maybe that's an incorrect assumption? I keep getting an error in Optistruct that the compliance is huge and optimization can't be performed. Any ideas as to why? The model is attached. Any help or guidance is greatly appreciated! vf0.3_min30_wcomp.mvw vf0.3_min30_wcomp_des.h3d vf0.3_min30_wcomp.hm vf0.3_min30_wcomp.fem vf0.3_min30_wcomp.log vf0.3_min30_wcomp_003.out
  6. Essa linha clara são 4 elementos de viga que recebem uma força na vertical no centro deles, representam uma manga de eixo. O objetivo é analisar distribuição de tensão nas bandejas de suspensão, por isso é bem simplificado. O problema é que, com uso de RBE3, eles deformam dessa maneira aleatória. Agradeço desde já as respostas.
  7. Hey Guys! I've just wondering, it is useful to apply second order element for composite in Hypermesh using Optistruct as a solver? I think the composite theories use pretty much linear approximation between layers that's why I'm asking this "silly" question. Thanks for answers in advance! Have a nice day, Imre ps.: if you have any good tutorial, books etc. for composite modeling I would be grateful if you can share with me! :)
  8. Hello, I have not been able to sucessfully finish my analysis because of a fatal error. .OUT file says the following error "1 error have been detected in element processing procedure in processes with id = 5. Plese check the corresponding out file for details." What is a process ID? I have encounter this error before with differtent id numbers, but have not figured out what it means. My model contains Hinge joints and is a NonLinear quasi-static analysis. Thank you for your help.
  9. Hey guys, I have a question on the theory of the SIMP Method used in OptiStruct to perform a Topology Optimization. I got that the stiffness matrix of a material is varied depending on its "density" and that using the penalization factor p, we are aiming for design with only 0 and 1 values in the end. For me it's still unclear, how OptiStruct is calculating these density values. How does the solver know where I have an element with density 0, 1 or something in between? Kind regards and thanks in advance Simon
  10. If we want to increase force as a step load method (step load method is when force done to an object is increased in to steps such as 200, 400, 600, and etc) in optistruct to analyze fatigue, what do we have to do? Show in figure
  11. Hello I'm new to Hyperworks and would like to learn via tutorials, especially Optistuct and Hypermesh for ply and composite analysis and optimisation. I've found a .pdf file and heard about a skateboard tutorial but I can't find the tutorial files anywhere. I'm using Hyperworks 14 (non student edition, I believe). I would be happy if someone could help me with this. Pascal
  12. Hello experts, I am hypermesh_optistruct user. i have heard about a new feature in OptiStruct 2018 named "initial stress". i have looked at some papers from Altair but all the information is about BULK-DATA in OptiStruct. There is nothing about "how to assign initial stress in HyperMesh interfaces" Can somebody help me? Appreciate any help. Thank you verymuch!
  13. hello everyone, i want to do an optimization in order to increase the correlation between experimantal results and numerical ones, using MAC cretria, my design variables are the stifness of the damping springs. my size optimization is well set it works but i don't know how can i connect the expermental result that i have in an .UNV file and the numerical results. to say to optistruct i want to increase the mac between the two. i know that i have to use the parameter TRAKMETH MODETRACK MFILTER. but i don't know the right steps to operate this one. if you have some ideas i will be greatful thanks.
  14. Hi everyone, I am looking for a card image to import node information as text file in a FE model in Optistruct. I have to import residual stresses due to production process, so they are pre-processing information. I found IC card image in GLOBAL_CASE_CONTROL. What about that card? I did not find any description about it. Best regards Martina
  15. Hi all, I got Windows 10 and the Hyperworks Student Edition 2017. I can start the Hyperworks student edition and create everything up to a model which is ready for the analysis with Optistruct. The problem is, when I try to start the analysis with Optistruct nothing is happening (at the down-left corner something running but it stops on "Ready"). I also read the other topic but that solution doesn't work for me either. I already tried to uninstall and install the program several times to different directories but nothing helps. I am trying to fix this problem for a week now and I'm starting to get desperate. I really need this program to work for a university project and I hope someone can help me. Thanks in advance Spaessel
  16. hello, im doing a model correlation between an experimental results stocked in a UNV file, and a numerical simulation run using optistruct while loading both results from the UNV file and the h3d i have a message the said << Node block 2411 or 15 or 781 does not exist >>. this error comes from the UNV file and i don't know how to fix it. thank you for your help!
  17. I'd like to share the seamless integration that Compose with other HyperWorks applications, such as HyperMesh and OptiStruct. In order to expose the Compose function to other HyperWorks applications, we need to register the function. This is done clicking on the right mouse button on Register Function in Compose: After this step, we may now see that the function has been registered under the same mouse click shown above under Show Registered Functions button. Once it is registered, we may now use it inside other HyperWorks softwares, and the function will be available without the need for closing and reopening the application of interest. Example in HyperMesh: Why Compose and HyperMesh? Matrix Browser queries and modifies HyperMesh and HyperView data entities without writing cumbersome TCL coding, along with a Math method developed in Compose. Example in HyperGraph: Why Compose and HyperGraph? Plotting capabilities of HyperGraph are expanded with Compose’s advanced functions and custom procedures developed by the user. Example in HyperView: Why Compose and HyperView? Advanced post-processing or special mathematical approaches may be applied directly on the model. Example in HyperStudy: Add a new output response Define a new expression Use your custom Compose function Why Compose and HyperStudy? User-defined functions to perform design exploration and optimization. Example in OptiStruct: Why Compose and OptiStruct? User-defined functions to perform optimization with DRESP3 card (desired response based on external files). Regards, Roberta
  18. Good Morning, I'm trying to do a Thermal Analysis. I want to know how temperatures are distribuited in the shell. Basically I have 4 Dirichlet Boundary condition. Please cam you help me to understand what I do wrong? best regards Termica 1.rar
  19. hello, i'm doing a size optimization in order to match the drequencies targets for the first 10 modes. so i defined my design variable wich is the PBUSH stifness k1..k6 and as and objective is the MIn using DSYSID (iwth all the 10 first frequancies and the targets) but some how i don't have the right results thats i want i have in my model DESVAR refered to stifness of PBUSH DVPREL1 DRESP1 MIN WITH a DSYSID everythings is well defined i don"t if there something else to add to my optimization to work
  20. Hello, I am working on design optimization of an aircraft component. I have obtained the shape of the required object using a topology optimization and am interested in refining the thickness of the part using a Size Optimization. However, I am unable to find an option to create a plane of symmetry in the DESVAR card or any other location. The results obtained from the optimization show a density distribution that is not symmetric either. Is there anyway to do this? Please let me know. Thank you!
  21. Hi, I got internal programming error with this message. *** INTERNAL PROGRAMMING ERROR *** in file "sparsekit", at location # 1952. ioerr(1) = 0 **** ABORTING RUN DUE TO AN INTERNAL ERROR **** I have attached .out file, can anyone here help me out please CHASSIS_WITHOUT_RIDER_PILIION_FLEX.out
  22. Hey guys! I would like to do a linear thermal analysis. I would like to catch the proper behavior of my system that's why I used constraints in the thickness direction of a thick aluminium plate. The plate should dilate in all direction but the top side of it. How can I apply such constraint which allows the displacement of a node in the positive direction of an axis and obstructs the DoF in the negative direction? Should I use some kind of contact for this purpose? Thank you for your time and your answer in advance! Kind regards, Imre
  23. Hi, I am facing the following error while running nonlinear implicit analysis in Optistruct and run got terminated. How to sort out this? Regards, Arul
  24. 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
  25. Hi all, How to calculate how much force required as a final output in the implicit nonlinear analysis (Optistruct)?
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