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Found 611 results

  1. Hi guys, i have some questions and problems with the tutorial OS-T 1600. 1. First question: What is the best way to start a FSI-Simulation. The way in the Tutorial, or the Co-Simulation Tool (Picture 1) (Picture 1) 2. Second question: When i start the FSI-Simulation i get an error (Picture 2). (Picture 2) I think i use the wrong hostname. Could anyone explain, what i should insert in the green field (Picture 3) (Picture 3) Thanks Michael
  2. Hello all, I am currently working on NVH Frequency response analysis with optistruct and nastran solvers and I see an error of opproximately 10%. Same FEA model has been used in both solvers and the error is 10%. If both the models are created in their corresponding solvers, then the error comes out to be 7%. How good is Optistruct solver for NVH to match Nasran solver? Any benchmarking done on this? Please help me out. Thanks and regards, Punith
  3. Hello, i tried to solve the Optistruct OS-T 1600 Tutorial, but after starting the two solvers (optistruct, acusolve) there is a convergence error of acusolve that stops the job: Messages for the job: *** ERROR # 5202 *** Acusolve stops before FSI iteration achieves convergence. *** PROGRAM STOPPED: FATAL ERROR(s) ENCOUNTERED. Does anyone knows the problem? I checked all steps of the tutorial and start it again, but the error still appears. The next step was to change the exchange parameter of acusolve (min/max_stagger_iterations) and optistruct (min/maxEX) to 30. A Simulation of the Tutorial with only 0.02s worked. To simulate the tutorial 0.1s or the whole 1s - as it is described in the Tutorial- still doesn´t work with a value of 100 for max_stagger and MAXEX. Another error appeared: Does anyone has got experience with the tutorial OS-T 1600 and solved it successfull? Thank you very much in advance.
  4. 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.
  5. Hello, I would like to export the residual stress results from a forming simulation in Hyperform to carry out a structural analysis of the formed part in OptiStruct. Could some one please share a tutorial based on this workflow? Thank you in advance. Regards,
  6. I have worked before with Pretension analysis and pretension manager on Optistruct. I am obtaining this error at the moment *** ERROR # 3090 *** Normals on the cutting section of PRETENS #20 are not consistent. Do you kow what this means? Thank you!
  7. Hi everyone, I am performing a non-linear quasi-static analysis on a system made by elements with different materials and geometry. I attach the files. The system has an SPC for dof 1, 2, 3 at the bottom part and compression pressure on the other 3 sides. The problem is that the analysis does not converge because of error 4965. Is this a problem of the load pattern or load type, or a problem of analysis parameter setting? Before this trial I performed on the same model a non-linear quasi-static analysis of simple tension along x axis imposing a displacement on the right side of the system and an SPC for dof 1, 2, 3 on the left side and the analysis converged. After this I imposed the displacement also along y axis, but it didn't converge, so I tried with forces, and then pressures, but the analysis didn't converge. If the problem is the load setting, the definition of an envelope of the vertical loads with the horizontal loads could give good results? Bests Martina Simm2D_full_compression.hm
  8. Hi everyone, I created an external unit cell, meshed it in Hypermesh and defined everything according to the Multiscale Designer Manual - Periodic mesh on opposing faces of unit cell - 3D mesh with only CTETRA elements - One component for each micro-phase (with component ID 1 & 2) - One property (PSOLID) for each micro-phase (with property ID 1 & 2) When I try to import my .fem-file in MSD I get the erroro message depicted below. I tried to import the external unit cell from the examples folder of Multiscale Designer and that worked. So the setup of my MSD works in principal but cannot import my file. Does anyone know how to resolve this? Thanks for your support.
  9. Hello, In Ansys and Abaqus solvers I Used to apply a "Skin" (2D elements based on the outer surface of 3D elements) on castings in order to read superficial stresses in Hyperview. These elements were membrane elements and were declared different than regular shell elements. For Optistruct which type of element is the one suited as membrane element? Is there any other approach to read superficial stress on castings? Here is an image of the availabre trias type of elements, which one should I Use? Thank you for your time!
  10. Hello, I have performed a transient thermal simulation with OptiStruct. I want to get the surface average value of temperatures in a surface for all the time steps, but I don´t know how to get it. Do you have any idea of how to do it in HyperView? Thank you very much Juan Iradier
  11. Hello all, I'have a problem with a file .fem. I try to start the calculation with optistruct, but few minutes later an error appears and the calculation stop. The error is error#1260 "Missing subcase information in the input file". I have checked if the nodes where the force are applied are connected, and the nodes are ok. Can you help me?
  12. Hi everyone, I am modeling a 3D hollow element made by more components in Hypermesh to conduct NLQS analysis with Optistruct. My system is symmetric and I want to know if there is the possibility to tell the software that the unmodeled part is the mirror of the modeled part, so that it considers the constraints due to the symmetry. I know the software allows to reflects elements, but I would like to not works with too many nodes. I attach pictures: 1 is the modeled/discretized part; 2 is the entire system (modeled, unmodeled parts) Thanks Martina
  13. I attempt to go through Toplology Optimisation with relative displacement (in x, y, z) as constraints and loadcases. SoI need to select all the nodes displacements at certain cross sections, where there is the only path transfering force to design area. I am new to optistruct and hyperview, I just noticed it is possible to select cross section and read also output every nodes' displacement in Excel. My question is, does it work in this way? and if yes, How should I input these data (should be more than hundred nodes) into Optistruct as an easy way? A tutorial would be so appreciated! Cheers!
  14. Hi , I am working on modal analysis of rotor system in optistruct. I have queries regarding constraints. Pls find the following image which shows rotor assembly with bearing. I need to allow rotation free of rotor and shaft at bearing locations. How to give constraints at bearing locations ? Using RBE2 or any other options are there in Optistruct? Thanks Arul
  15. Hi there. I hope someone will help me finish my model. I am analyzing a beam that will move the entire wind tunnel support jacket. See first picture. This beam is placed on top of the SPMT truck. See second picture. My question is: A. How to I model the contact between the top of the long beam and bottom of the bracket (second picture denoted as A). I am getting an error "Undefined SET SSID on CONTACT 1" but I already defined it. I don't know what am I missing. B. The boundary condition will be placed at the wood locations. This will be in compression only condition. How do I model that? I am attaching my model (only half have been modeled yet). JDN_Loading_Beam_Rev_A.hm
  16. Hi, I want to know the meaning of the data in output file for nonlinear transient analysis. What is the meaning of ' itstp', 'norm(da)', 'noram(u_ref)', 'err_da', 'adjustment'? 'err_da' is error for what? 'itstp' is iteration step? then what is the difference between 'itstp' and 'Iter' ? 'Cutback' means that iteration does not satisfy the convergence criteria? So increment load is changed? In this, what is the meaning of 'Reduce next'?? what should be reduced next? In this, what is the meaning of 'No change' ?? What should be not changed? In this, what is the meaning of 'Enlarge next' ?? What should be enlarged? Thanks
  17. 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
  18. Good morning, I'm running a transient analysis of 2 gears (one of them with a preload and the other one with an imposed rotation). When I run it with Optistruct I get 2 problems: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. The biggest problem comes here, if I analysis the results, the contact status is 0 everytime. The gears rotate but they don't seem to have a good contact. Moreover, I get high normal contact forces at points where there should be any contact (see image attached). I also attach the .fem to make it quicker and the .out from the previous simulation Thanks!! 1107rem.out 1207manana.fem
  19. Hello, I am trying to assign a failure criteria based on strain. For example, I want to be able to remove or replace the material properties of elements that reach 0.9% strain, or do the same thing when the principal strain of an element exceeds 10000 microstrain (these figures are from literature). The MATF card only takes stresses. How can I implement these strain-based criteria? Thanks.
  20. Hi, My loadstep, TSTEP and NLPARM are as follows In the result, the number of the time data is 432. (Its time step is not 0.0001) I learned that when NLPARM and TSTEP are used together, DT on NLPARM overrides DT on TSTEP. This result is caused by incremental load based approach in OptiStruct? Thanks
  21. What is the difference between them in term of slave and master nordes relative movement?
  22. Hi, My load step is nonlinear transient and my model contained the contact. Output message is as follows. My model does not have a linear analysis SUBCASE. "the gap/contact behavior depends on the initial open/closed status and does not change." -> It means contact status is not updated. But the status is updated for each iteration in my results. Why does the message appear? is it just only information? Thanks.
  23. Hi everyone, I am modeling a system composed by solid elements that are welded together. I want to develop tetra mesh from 2D automesh at the contact surfaces, but when I create the 2D mesh on the adjacent surfaces they are different and this leads me to an incorrect 3D mesh because after tetra meshing I equivanlence the nodes on the adjacent surfaces and the mesh elements fail. I use "keep connectivity" when I create the 2D mesh, but sometimes the meshes are equal, sometimes they are quite different. Why? What can I do?
  24. Hello, I would like to understand what the solver is doing wile trying to solve a nonlinear problem. I understand I have stated in NLPARAM to star iteration at 1.0E-2. I have also activated ExpertNL In the next picture, what is the solver doing each iteration of each load step? what is changing? what Average U, Err. EPI, Measures EWI mean? WHat is the goal of the solver to notice it is reaching convergence?
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