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Found 627 results

  1. 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!
  2. 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
  3. 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
  4. 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.
  5. 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.
  6. 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
  7. 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.
  8. Hello all, I am attempting to use some RBE3 elements to apply loads and I am receiving this error: A fatal error has been detected during input processing: *** ERROR # 774 *** When a grid's component has no stiffness, then that component cannot be an independent d.o.f. in an RBE3. RBE3 id = 270584 grid id = 326669 weighted components = 123 max d.o.f with stiff = 1 Would greatly appreciate some advice regarding this. Thanks
  9. Hi everyone, I am writing here hoping someone can help me with the following problem. I have a plate which is connected to one end of a flexural spring (0.8mm thick) through FREEZE contact (please see picture below). The other spring end is fixed. I have used 2 loadsteps to perform this analysis: The plate has to translate downwards of about 1.4 mm. LGDISP non linear static analysis activated. From the position reached in the previous point, the plate must rotate about the X axis of an angle 0.25° (DOF4).LGDISP non linear static analysis activated. All displacements have been enforced through SPC. Picture of the model: I have used CNTNLSUB in order to make one subcase follow the other. Unfortunately, from other threads in this forum, I seem to have guessed the 1st loadstep loads (SPC enforced displacements in this case) must be enforced in 2nd loadstep as well. This proves to be impractical, since my final goal is to simulate bending+torsion in the flexural spring. In fact, I cannot impose the desired rotation in the 2nd loadstep because the plate has to be forced to translate downwards like it is in the 1st loastep. I am attaching my file in order to get the matter as clear as possible. Thank you in advance for any help you will wish to provide. Best Regards Matteo Spring_Plate.fem
  10. Hi all, I am trying to produce a script which lists displayed entities. Specifically, I am looking to write a script which displays all loadsteps, then creates a list of all loadcollectors, hides then reshows them and deletes all non-displayed loadcollectors. it seems a bit long winded but my model contains loadadd loadcollectors and when I come to delete unused loadcollectors it doesn't identify any... despite there being a good number which are in no way used. Cheers in advance Andy
  11. Hi, I have a geometry where i already reduce its size by factor of 5 in order to reduce the element number and calculation time. But, when i run the topology optimisation, its stuck at 0 iteration with 62% progress. I don't know why this happen because i expected it the calculation time should be shorter since i reduce its size. Please explain it to me. Here is my .fem file Chassis_Facteur_5.fem
  12. Hi, Instead of rubber bellows I have used Cbush element and given stiffness to it. I want to give preload also. I have checked we cannot give preload to cbush element. CROD,CBAR,CBEAM support for giving preload. Is there any option (spring type) to give preload and stiffness to 1D element simultaneously ? Please let me know soon. Regards, Pratik
  13. Hi, I have a problem with my model because i doesnt show any optimization after i ran the calculation.Plus, the solver are empty and its only said that the job is completed. I'm using an Optistruct of my school which connected to the server i guess. Please help me.
  14. Hello, I'm trying to define contacts between 3 parts of my model. The model consist out of shell elements only. Tried the autocontact, connectors and contactsurfaces tool. However I didnt manage to connect the parts. I have attached an screencapture of the file as well as the model file itself. Can anyone help me out here? BottomConstructionLoose.hm
  15. Hi all, I am facing the following error in implicit nonlinear analysis. How to sort out the error? *** ERROR # 3019 *** TABLES1 bulk data entry ID=2 has a segment that corresponds to zero or negative hardening. This may lead to poor convergence and excessive plastic flow. Regards, Arul
  16. Hi,I am sorry to ask questions again. Now I am studying the structural optimization design of the automobile B-pillar. This time, there are about three minor problems to be solved. 1. I don't know how to set the variable thickness shell element. I saw the following method to set the variable thickness unit in a journal. Setting different thickness simulation shells for the four nodes of the shell element, but I don't know how to achieve it. Can you give me some advice? 2. Since currently optimized based on the B-pillar, the B-pillar components are taken out of the vehicle as shown in the following figure. How do you impose constraints on the upper and lower ends to simulate the vehicle constraints as much as possible? In other words, how to apply constraints to the B-pillar to simulate the constraints in a real vehicle.? 3. Can the size optimization in Optistruct set the coordinate value to the design variable? In addition, can velocity load be applied in optistruct? Thank you in advanced.
  17. Hi all, Been having issues with a model recently, previous versions of it have been converging but recently it seems to have just stopped converging. I've managed to get it to converge but after over an hour of processing (it should have taken 10 minutes), when viewed, there appears to be many orphan nodes. Can orphan nodes cause convergence issues? How can you get rid of them in hypermesh? Cheers Andy
  18. Hi all, I have a model with multiple contacts and have been using N2S contacts. I've found that in some of my loadcases, these contacts produce excessively and unrealistically high loads. I've checked to assure there is a sufficient gap between master and slave components and have even tried changing to S2S, PARAM EXPERTNL CNTSTB... in every case the the contact in question remains an unrealistically high stress or another contact which was previously low force suddenly becomes massive. The way I set the models up is to select contact surfaces for both slave and master and select slide option, I don't apply any clearance or srchdis values. Anyone any suggestions? Alas I cannot share the model.
  19. Hello all! can i solve issue is like this? i have 2 plates ( but plates are not a siple form) which are separated by air. how can i solve it task? is it possible in optistruct using heat transfer analysis. i have created 2 interface convection. 1-plate blue and point 2-point and plate brown. but it doesn't work. plate blue heated (in blue plate is root of heat), but the brown plate was cooling=( Do you have any idea? thanks.
  20. Hello Altair Team, I am doing a non-linear quasi static Simulation with 2 sequential load steps. I would like to apply a force after Deformation (Load step 1) in a cetain direction for example X (local Coordinate Sys). I have tried to define a local coordinate (CORD1R) and assigned the nodes and the force to this Local System. I expected that the coordinate System move with the Body (Green coordinate system). But the results Shows, that the force will be applied according to the local coordinate direction in the beginning Situation.(Red Coordinate System) it means that the local System does not move with the Body. In hyperview, it stays at the beginning Position. Could you please give me some hints about moving local coordinate System.
  21. Hi, I am trying to learn how to run FEA on hyperworks (beginner). Eventually, I'm going to implement it for my thesis. I've followed exactly as the tutorial video tells me to do in terms of meshing, assigning material and property, load collectors and setup. As I ran the OptiStruct, it gives me error of, *** Errors with missing, incorrect or duplicate IDs found 600 times. ************************************************************************ There were 600 error messages during input processing. The first message is repeated below: *** ERROR 14: Missing property # 1 referenced by CQUAD4 # 1. *** Errors with missing, incorrect or duplicate IDs found 600 times. ************************************************************************ ==== End of solver screen output ==== ==== Job completed ==== I've read other questions, but this error seems like it's coming from assigning the wrong property. I made sure it's selected as PSOLID. My model is just a simple cube, I am not sure where this error comes from. Could you please help me going through this problem? I'm attaching the model file for your review. Please point out what I've done wrong. I'm a bit frustrated learning this software because of so many things need to be done prior to the analysis. PRACTICE1.hm
  22. Hello Guys, I want to reanalyse my results from a topology optimization. As the part has thick walls, I don`t want to calculate with a surface-mesh. Is it possible to do a reanalysis with solid-mesh? (If yes - how?) Thank you Cheers
  23. Hi everybody, I was running a test with optistruct using two simple cubes. They are both fixed at opposite ends. Their faces are separated by 0.1 mm and can, if pushed, become engaged in a contact (type SLIDE). Type of analysis: nonlinear quasistatic. Issue: Even if I fixed both cubes at their bases and there is no applied force and no contact is engaged (shcdist=0.001 and the solver warns me that no contact elements have been defined during the analysis), the cubes translate of 2 mm as if they are moving like rigid bodies. I have already tried to constrain some more nodes, to no avail. Any explanation for this thing by anyone? Thank you in advance. Find attached my .fem file to check SHRCTOL001.fem
  24. Hello everyone!I'm performing a finite element analysis with a pair of gears and another component around this pair of gears. This system is named as "planetary gears". My model is simplified, just to see how will be the behavior of the system, I'm using the software Hypermesh with the solver OptiStruct. My question is, which degrees of freedom on "FACE 1" and "FACE 2" should I constraint to rotate "GEAR A" and "GEAR B" around the axis X.Degres of freedom:Displacement: x, y and zRotation: x, y and zI have attached the picture. Thanks so much in advance.Henry
  25. hi Is their any way to calculate torsional stiffness with the help of mass and frequency
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