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Found 607 results

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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.
  7. 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
  8. What is the difference between them in term of slave and master nordes relative movement?
  9. 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.
  10. 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?
  11. 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?
  12. Hi, How to Clear the temporary nodes? Find the following Image. It is not cleared even it I use the option ( Shift +F2) and it is showing in Post processing. Is there any other way to clear?
  13. Does anyone know how to make the stress change with each displacement step in an optistruct simulation? Currently when I have it show me the stress heat map, it doesn't change at each displacement step.
  14. I am having trouble figuring out why there are strange reaction forces in my model. The rightmost node allows for rotation (vector out/in screen) and the bottom left node pushes up at a set displacement. The rightmost node should not have so much force in the x-direction. Any help in figuring out why this is happening is much appreciated. Femur_Model_7_1.hm
  15. Hello, I have a group of springs from which I want to extract the total force in a simulation. Is there a quick and easy way to do this? I'd really appreciate your help
  16. I am trying to squeeze a femur model with two sets of stiff springs top and bottom, and allow it to rotate with the other (spring BCs come from a research paper). Instead, the model bends where the mesh meets the springs that should remain mostly straight. However, I have tried adjusting all DOF stiffnesses in the PBUSH card without luck. All springs have been assigned to the local coordinate system (shown in right on photos) using CBUSH card. It seems to me I need to stiffen K2 or K6 (y-tension, z-moment), but neither of these solves the issue. Attached graphs show "TY" stresses. Femur_Model_6_26.fem
  17. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!
  18. Hi! I wanna model the rotation of a gear (wheel) with a preload in the pinion. I asume the preload is modeled with a moment but, how do I model the rotation? And which analysis type should I choose? (I don't want a quasi-static one). Some analysis don't let me include a LOAD. Thanks in advance!
  19. Hello all, I am trying to load a femur model according to a local coordinate system. When loading in the non-desired direction for testing (Z-dir) the model node moves predictably. But when I try to load in the desired direction against the springs (X-dir), the model does some crazy twisting and weird movement. Would love some help resolving this issue. I have a suspicion it may have to do with the springs... making them very compliant still didn't solve my issue though. .fem files attached 6_25_Altair_Question.zip
  20. Hi! I try to calculate the resulting spcforces for a given displacement field on a hugh model with about 2.000.000 nodes. The displacements are applied to the model using spcs for each node and each component. This usually should be easy to calculate since the stiffness matrix does not even have to be inverted. The problem is that after the solver is finished, writing the .op2 file tooks a big amount of time... Time spent in section: SOLVER; CPU= 3916.96; WALL= 704.95 Time spent in section : OP2; CPU= 39045.11; WALL= 39026.59 Is this a common problem? For which reasons could writing the .op2 file that slow? In the following you can find the .stat file of the job: Program execution started at Wed Jun 19 12:16:49 EDT 2019 Command line arguments: mono_wo_RBE3_and_2_only_one_subcase.fem -ram=92000 same as: -len -nproc=8 Options read from config files: DOS_DRIVE_R = /. env(OS_RAM) 6000 TIME SPENT IN MODULE : READ; CPU= 133.56; WALL= 133.51 START RUNNING MODULE : PREPR1 ... TIME SPENT IN MODULE : PREPR1; CPU= 4.13; WALL= 4.18 START RUNNING MODULE : DESIGN ... TIME SPENT IN MODULE : DESIGN; CPU= 6.48; WALL= 6.47 START RUNNING MODULE : PREPRO ... Start running section : PRPDDM ... Time spent in section : PRPDDM; CPU= 0.01; WALL= 0.01 ***** datamanager call insert irlist for array size 542810504 using 32-bit ***** datamanager call insert scr4_ for array size 516096848 using 32-bit Start running section : PRPSL4 ... Time spent in section : PRPSL4; CPU= 167.88; WALL= 167.87 Request for memory resize from 9200 to 54973 MB Resize ok with new memory. TIME SPENT IN MODULE : PREPRO; CPU= 314.15; WALL= 310.87 ITERATION 0 START RUNNING MODULE : CHECKEL ... TIME SPENT IN MODULE : CHECKEL; CPU= 6.01; WALL= 3.71 START RUNNING MODULE : SOLVER ... Start running section : PRASMB ... Time spent in section : PRASMB; CPU= 0.08; WALL= 0.08 Start running section : SPASMB ... ***** datamanager call insert force for array size 2147483640 using 32-bit Time spent in section : SPASMB; CPU= 127.78; WALL= 127.71 Solving subcase 11 Solving subcase 11 Solving subcase 11 Start running section : PREFCT ... Time spent in section : PREFCT; CPU= 0.32; WALL= 0.32 Start running section : INPTVM ... Time spent in section : INPTVM; CPU= 8.34; WALL= 8.34 Start running section : FCTMTX ... Time spent in section : FCTMTX; CPU= 3660.07; WALL= 520.04 Start running section : SOLRHS ... Time spent in section : SOLRHS; CPU= 81.98; WALL= 11.57 Start running section : SAVFCT ... Time spent in section : SAVFCT; CPU= 32.89; WALL= 31.11 Start running section : STRENR ... Time spent in section : STRENR; CPU= 4.14; WALL= 3.73 Start running section : KINENR ... Time spent in section : KINENR; CPU= 0.00; WALL= 0.00 Start running section : OBJFUN ... Time spent in section : OBJFUN; CPU= 0.00; WALL= 0.00 TIME SPENT IN MODULE : SOLVER; CPU= 3916.96; WALL= 704.95 START RUNNING MODULE : STRESS ... TIME SPENT IN MODULE : STRESS; CPU= 119.78; WALL= 118.96 START RUNNING MODULE : RESP 1 ... ***** datamanager call insert scratch1 for array size 2147483620 using 32-bit TIME SPENT IN MODULE : RESP 1; CPU= 0.03; WALL= 0.03 START RUNNING MODULE : SCREEN ... TIME SPENT IN MODULE : SCREEN; CPU= 0.02; WALL= 0.02 START RUNNING MODULE :CONVERGE ... TIME SPENT IN MODULE :CONVERGE; CPU= 0.06; WALL= 0.06 START RUNNING MODULE : PRINT ... TIME SPENT IN MODULE : PRINT; CPU= 0.01; WALL= 0.01 START RUNNING MODULE : RESULTS ... ***** datamanager call insert sortres for array size 2147483640 using 32-bit Start running section : OP2 ... CASECC data block written to the .op2 file for 1 SUBCASEs. Length = 14820 words. GEOM1S data block written to the .op2 file. GEOM2S data block written to the .op2 file. GEOM3S data block written to the .op2 file. GEOM4S data block written to the .op2 file. EPTS data block written to the .op2 file. MPTS data block written to the .op2 file. OUGV1 data block written to the .op2 file for 2108395 grids. OES1X data block written to the .op2 file for 1954188 elements. Time spent in section : OP2; CPU= 39045.11; WALL= 39026.59 Start running section : MISC ... Time spent in section : MISC; CPU= 0.64; WALL= 1.29 LIMIT ON ITERATIONS REACHED. INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED). TIME SPENT IN MODULE : RESULTS; CPU= 39045.76; WALL= 39027.88 START RUNNING MODULE :FINISHUP ... TIME SPENT IN MODULE :FINISHUP; CPU= 4.36; WALL= 4.37 Detailed disk usage: High usage overall :96709.6 MiB, Solver scratch :41605.0 MiB, Internal database : 4109.0 MiB, Out-of-core assembly : 0.0 MiB, Temporary files :51183.6 MiB. AVERAGE SYSTEM LOAD 5.14 SOLUTION COMPLETED, THE FOLLOWING IS CPU/WALL CLOCK SUMMARY (IN SECONDS): TOTAL TIME SPENT IN MODULE :READ ; CPU= 133.56; WALL= 133.51 TOTAL TIME SPENT IN MODULE :PREPR1 ; CPU= 4.13; WALL= 4.18 TOTAL TIME SPENT IN MODULE :DESIGN ; CPU= 6.48; WALL= 6.47 Total time spent in section :PRPDDM ; CPU= 0.01; WALL= 0.01 Total time spent in section :PRPSL4 ; CPU= 167.88; WALL= 167.87 TOTAL TIME SPENT IN MODULE :PREPRO ; CPU= 314.15; WALL= 310.87 TOTAL TIME SPENT IN MODULE :CHECKEL ; CPU= 6.01; WALL= 3.71 Total time spent in section :PRASMB ; CPU= 0.08; WALL= 0.08 Total time spent in section :SPASMB ; CPU= 127.78; WALL= 127.71 Total time spent in section :PREFCT ; CPU= 0.32; WALL= 0.32 Total time spent in section :INPTVM ; CPU= 8.34; WALL= 8.34 Total time spent in section :FCTMTX ; CPU= 3660.07; WALL= 520.04 Total time spent in section :SOLRHS ; CPU= 81.98; WALL= 11.57 Total time spent in section :SAVFCT ; CPU= 32.89; WALL= 31.11 Total time spent in section :STRENR ; CPU= 4.14; WALL= 3.73 Total time spent in section :KINENR ; CPU= 0.00; WALL= 0.00 Total time spent in section :OBJFUN ; CPU= 0.00; WALL= 0.00 TOTAL TIME SPENT IN MODULE :SOLVER ; CPU= 3916.96; WALL= 704.95 TOTAL TIME SPENT IN MODULE :STRESS ; CPU= 119.78; WALL= 118.96 TOTAL TIME SPENT IN MODULE :RESP 1 ; CPU= 0.03; WALL= 0.03 TOTAL TIME SPENT IN MODULE :SCREEN ; CPU= 0.02; WALL= 0.02 TOTAL TIME SPENT IN MODULE :CONVERGE; CPU= 0.06; WALL= 0.06 TOTAL TIME SPENT IN MODULE :PRINT ; CPU= 0.01; WALL= 0.01 Total time spent in section :OP2 ; CPU= 39045.11; WALL= 39026.59 Total time spent in section :MISC ; CPU= 0.64; WALL= 1.29 TOTAL TIME SPENT IN MODULE :RESULTS ; CPU= 39045.76; WALL= 39027.88 TOTAL TIME SPENT IN MODULE :FINISHUP; CPU= 4.36; WALL= 4.37 CUMULATIVE RUN TIME: CPU= 43551.31; WALL= 40315.02 TIME SPENT IN MODULE : CLOSE; CPU= 0.46; WALL= 0.98
  21. Hello, I want to simulate the following mechanism I need the orange pin to slide trhough the green slot when the green slot moves due to other machanism movement. This is the configuration of contact that I used: Nodes on the all arround the slot are the slave and all of the pin elements (membrane of a 3D) is the master. And the results are these: what do you suggest i can do? What is wrong with my contact card, or what other approach do you suggest? thank you for your itme.
  22. Hi, I want to do 'preloaded nonliear transient analysis'. 'nl_static' is Bolt Pretension analysis. But output is as follows. Nonlinear transient analysis does not support PRELOAD card? Thanks.
  23. Hi! I'm a student and I have the Student version of HyperWorks. I would like to import an STL file in Optistruct, but there isn't the choice of STL in Import Solver Deck. Is it possible to import it? Thanks Martina
  24. Hello, I have been trying to assign a local coordinate system to a group of constraints and my model so that I can load it in a direction specified by the local coordinate system. Therefore, I believe I need to use the Mesh>Assign>Node Analysis System and BCs>Assign>Load Reference System for all my constraints and model nodes. However, when trying to assign the Node Analysis System, only "set displacement" works. "set reference" gives an error saying that "Nodes defining a system cannot be assigned to it". I have a feeling this is why my Optistruct simulation is quite bad. Interestingly, I tried the same method on a very simple box model in a separate model, and created a coordinate system using the nodes of the box. I was able to "Set reference" without a problem, and I could see a clear change in the OptiStruct displacements to the new local coordinate system. I am wondering why my other model does not allow me to set the reference. Any advice is very appreciated.
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