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Found 496 results

  1. Hi , I am having following queries while trying Modal correlation option in Hyper view - NVH. 1. I am facing error while using transformation option in Hyper view - NVH - Modal correlation. Pls find the below image & help how to sort out. 2. How to use tolerance option in Node pairs menu. I could't able to get the values in the below table Regards, Arul
  2. Hi, there is a question I would like to ask the teachers, recently learn to use optistruct for composite material optimization design, encountered some unsolvable problems, I want to use the cohesive element to simulate the cementation damage between the composite layers, but there is no cohesive material in the hypermesh. There is no such material property, no damage evolution rule and damage criterion of the cohesive element. There is a cohesive element in the hypermesh-abaqus interface, but I don't know how to call it in the optistruct. So,is there any methods to solve this ,could you give me a reply .best wishes.
  3. Hi, I am trying to do an analysis on a enamelled sheet metal part, it is bimaterial. As initial condition, temperature is 350 celcius degrees and as final condition, temperature is 25 celcius degrees. So, I applied a temperature load. I used MATT1 and entered temperature dependent material properties in TABLEM1 format. I used PCOMP card to model the structure as composite. Materials (Steel and Enamel) are taken as isotropic materials so there is no ply orientation. When I start the analysis with Optistruct, the programme gives the following error message: ERROR 14: Missing property # 2 referenced by CQUAD4 # 1 What can I do to solve this problem? Thanks in advance. Mert
  4. Hello everyone, I'm currently running an composite optimization on a part and today I noticed that the mass I get on the .out file and on the model I import after the size optimization is different. On this optimization, I try to minimize the compliance of the part while constraining the mass between 3200g and 3600g. Here is what I get on the .out file: Here is what I get on the imported model: While on the output file I get a total mass of 3600 as requested, when I import the model, the total mass is now 5322. I've searched around, followed tutorials and nothing helped. I tried opening the *.inc file as suggested on tutorial OS-3400 but the result is the same (the same as if I just import the .fem file resulting from the free size optimization). I've looked on this forum and I found something about the CMF file instead but after the free size optimization, I only get the *.HM.ent.cmf and not the *.HM.comp.cmf as mentioned here: I also tried running the optimization with MATINIT set to 1 on opticontrol but once again, the result is the same... Can someone please help? Thank you very much!
  5. Busra ASlan

    Lattice Structure Type

    Hı I am trying lattice structure optimizatons. Actually I can do it. I want to change lattice types such as 1,2,3,4 and than results compare but I dont have any difference. If you know solution for this problem,can you help me? Thank you
  6. i have these doubts please explain anyone 1) To converting rigid bodies into flexible bodies in hypermesh opti, Why we are going for modal analysis? 2) is there any method other than Modal analysis?? please help me with this thank you
  7. Hi all, Am trying to find a line of code which will select a component / assembly / set etc, when the name contains a certain string... for instance the assembly name may read "apples-001001a" but I want a script to select that assembly if the name contains "apples" as the number could change in the future. Any ideas? Cheers Andy
  8. Hi everbody, we are doing a non linear quasi static analysis of a turbine vane. We are not able to arrive at convergence. It works only with all contact freeze. I share the model and the file .out, can you please help us? turbine_vane_nlqs.txt turbine_vane_nlqs.hm
  9. N_R

    Tutorial OS-T 1600

    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.
  10. いつもお世話になっております。 只今、CFRPパイプに部分的に肉盛り積層したような物を解析しています。 Optistructにおいて断面係数および断面二次モーメントは計算出力出来ますか。 よろしくお願いいたします。
  11. Imre

    Unit of OptiStruct

    Hey guys! I saw one composite optimization tutorial where the units of the results were not S.I. (lbs, ft etc.). My question is: how can I modify the unit of my input parameters? So far I thought that Optistruct use mm, s, MPa, ton as unit and I have to calculate the conversions between different units of measure. Thanks for your answer in advance! Best regards, Imre
  12. Imre

    OSSMOTH problem

    Hey guys! I made a tutorial of composite optimization which contains a ply smoothing steps. The name of the tutorial: OS-T: 3400 Design an Open Hole Tension (OHT). The model setup was the same and I got the same result for linear static analysis just like in the tutorial. The optmization went well, I got the same result as you can see on the attached picture. In the tutorial the name of the plies are different because I use the version 2017.2 . I have 2 plies which contain the same element like in the tutorial. After free-size optimization I made the next step: OSSMOTH. It gave me some funny result as you can see on the pictures. You can see the settings are the same and the results still different. On the 3rd picture you can see the OSSMOTHING result from the tutorial. You can see that the settings are the same but the results are very different. Could someone explain why I got so different result? Thanks for your answer in advance! Best regards, Imre
  13. Farzin

    Contact Penetration

    @Prakash Pagadala Hello Prakash, I am trying to simulate a model with several contacts in Optistruct (Non linear quasi static). The Materials are all linear but with very Little Young Module (40-300Mpa). But there are big Penetrations between sliding parts and the results are not correct. Contacts with Problem: ID 16 ID 17 ID 26 ID 27 ID 28 I have followed all Solutions in this Forum but it did not work out. I have tried following Solutions: -Contact type: SLIDE -Nlparam NINC increase to 200 -CNTSTB load collector and CNSTB Card in Param (EXPERTNL) - MORIENT= Opengap -Additional Clearance: 0.1 -String Value>>Adjust>> Auto -S2S and N2S (Both tried) -Track INFINIT and Consli (Both tried) - Symmetric Contact for IP 16 (2 identical contacts with reverse Slave/Master Component) - PCONT>>STIFF>>HARD Because the Simulation takes so much time i share the H3D results too. Thank you so much for your help P.s: I should mention that this Model with this Material Parameter has been simulated successfully in Abaqus.
  14. matwas

    heat transfer issue

    Dear Colleagues, I have a problem with heat transfer analysis. I am experienced with ANSYS thermal analyses and at the same time I am working with HyperWorks for a couple of years but it is my first more complex thermal problem that I am solving with HW. My problem is, I don’t know how to set properly the analysis Load collectors and steps. What I want to do: I have a part of a machine (rotating lathe table) which is heated by heat generated in bearings and motor. According to the norms I have performed on machine test and I need to reply this with FEA to obtain a model on which I can test construction changes. The machine has been working in a few timesteps, with different parameters. My question is how to set the Loadsteps to obtain a few substeps which are performed one after the other under the terms of the previous. Bellow I posted a shorten table of the experiment. The heat flux has been calculated analytically. Time [min.] heat flux [W/mm2] 0 – 30 hf1 30 – 60 hf2 60 – 120 hf3 ... After that I want to obtain the temperature distribution on the table and its deformation (displacements).
  15. Hello Everyone, I am running a simple implicit simulation with Optistruct Solver. I want to analyse the Bending Moment Diagram of a hollow beam supported by 2 locations and Load is also applied at 2 location on opposite surface. Please find attached file for more details. Can you please help me how to plot and analyse the Bending Moment Diagram of this Beam. Thanks In advance. Regards Nitin Jain SB2_mit_radius.hm SB2_mit_radius.h3d
  16. 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!
  17. Hi, I'm getting the following error while trying to run a modal analysis in Optistruct. Could anyone help me make sense of this? ANALYSIS RESULTS : ------------------ ITERATION 0 *** ERROR # 825 *** The run will be stopped due to the previously encountered fatal error from the element generation routine in preprocessing: Number of failed elements = 1 Last encountered error code = 15 The previous error is encountered in subroutine prpdrv. This error is issued in subroutine elqcdrv. *** INTERNAL PROGRAMMING ERROR # 8006 *** Data block effmas not in data manager dictionary. * DATAMANAGER ERROR in subroutine "locateit". **** Error 8006 in datamr() during "locate" operation. Data block name "effmas". Current memory allocation 8166 MB, Unused memory 6248 MB, Number of blocks: 280 used, 5 free. Call arguments 0, 0. *** INTERNAL PROGRAMMING ERROR # 8020 *** Failed database modify command: Locating array effmas.' * DATAMANAGER ERROR in subroutine "LOCATE". This error occurs in module "wrtdrv".
  18. Hello every one, I'm running a topology optimization with a min compliance and volume or mass fraction constraint. Do you know why the mass or volume fraction recommanded is 0.3 or less? Best regards, Lucy
  19. viketh

    modal analysis

    how to perform modal analysis of cylinder subjected to external pressure
  20. Hello Altair Team, i am doing a non-linear quasi-static Simulation. My model contains several part. I want to know, is it possible to see Compliance Value for an specific part of the model (In oder to use ít as a referemce value in Optimization for this specific part)? Thank you
  21. Hello, I have a laminate with 3 plies. I want to optimise the orientation of these plies such that the deflection of the laminate is minimum under the applied load. I can only perform composite shuffle, but I'm not able to optimise the ply angles. Please advice as to how to proceed to solve this issue Thanks, Kushal.
  22. Hello Altair Team, I have done a non-linear quasi static Simulation and the contact Forces (CONTF) are calculated. In a simplified model, i would like too apply this Forces on the exact same component Surface and do a topology optimization (static load case according to contact Forces as Loads on nodes or elements). I have tried to use APPLY RESULT in Post menu, but there is just Displacement as Data type available. How can i apply another types of result as a load collector in my model (In this case contact Forces)? Thank you so much for your help
  23. 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.
  24. Hi. I am new to this software and i got an error which read: *** ERROR # 1000 *** in the input data: Incorrect data in field # 4. The element in question is a CTRIA element.
  25. Hello community, I got a little bit confused while reading the OptiStruct 2017 User’s Guide. There I found that OptiStruct selects automatically the best optimization algorithm. Five items have been listed there (page 10-11): - Optimality criteria method - Convex approximation method - Method of feasible directions - Sequential quadratic programming - Advanced approximations . My question is: Does OptiStruct still selects the Optimality criteria method automatically? And for which type of optimization? There is no information about it in the User’s Guide or Reference Guide. I want to optimize the topology of the 2 dimensional MMB-Beam (see atteched figure). My objective is to minimize compliance subjected to a volume fraction constraint. I found that for my type of problem I shoud use 'OPTMETH=DUAL' since I have a large number of design variable and only one constraint. So I cannot choose the Optimality criteria method in topology optimization? Many thanks in advance Nahid