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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

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Found 105 results

  1. Hi, I'm doing a DSYS type optimization and I inserted some parameters in the "desvar" part, and I'm not able to identify the values of these optimized parameters in the hyperview. Can someone help me??
  2. "The objective of the optimization is to minimize mass with the responses stress & mass." What value should I take for upper bound in "dconstraints" option.
  3. I'm planning to use HyperStudy for multi objective Optimization of laminated composite structure, and I wanted to know it is possible to make orientation of ply as one of the design variable? I want optimum angle for ply, for the given load condition, rather than sticking with the angle given by user. Thank you.
  4. Hi, I need to convert my optimization result to a 3D CAD model for 3D printing. The model is divided into design and non design spaces. When I export the model, only design space is converted. How I can convert the whole model into CAD model. When I try to export the solver deck as .stl file, there is not .stl file option available. I appreciate if someone can help. Thanks, Soraya
  5. *** ERROR # 1807 ***

    Im getting the following error when i tried to put composite shaft with constrains Mass, and Composite Failure Upperbound 1. The Objective Function is Min Compliance. *** ERROR # 1807 *** Composite failure responses are applied to ply 9 which belongs to a topology or free-size domain. Help needed, Thank you
  6. Hii, I am doing Topology Optimisation of Truss (Benchmark Problem).I am not getting proper results of topology as expected.Please do suggest me what to do for proper analysis & optimisation.I am unable to find out my mistake.I am attaching my files 6 NODED 11 MEMBERS TRUSS.fem 6 NODED 11 MEMBERS TRUSS.hm 6 NODED 11 MEMBERS TRUSS_des.h3d 6 NODED 11 MEMBERS TRUSS_s1.h3d
  7. Hey all, currently I am working on a composite optimization process that involves no 45 and -45° plies. What I experienced was, that with the step 3 (shuffle optimization), optistruct did not consider my constraint of maximum ply successor. Is this a knows issue? Additionally, why can't we define pairing constraints between other plies than the 45 and -45° ? Is there a physical reason why you would do that just with 45 and -45 ? Thanks and best regards Merula
  8. Difference MINDIM, MINMEMB

    Hello Is there a difference if you set MINDIM or MINMEMB? You can go either to Analysis>Optimization>Topology>Parameter and then change minmemboff to mindim with a value, which will assign it to the Design Variable Property. Or you can go to Analysis>Optimization>Opticontrol and set MINDIM with a value, which creates a new optimization control named 'optistruct_opticontrol'. Thank you in advance for your help!
  9. Lattice structure minimum diameter

    Hello Normally a lattice optimization does create lattice structures of different elements. Does a way exist to set a minium diameter of the lattice structure? I know the function 'MINRAD', which cleans in the second optimization phase and eliminates all elements above the set value. If I use MINRAD, almost all lattice structures are eliminated, as they are quite small (between 0.0027 and 0.335 mm). The ideal lattice structure would have diameters above 0.5 or 1 mm. How can this be set? I thank you in advance for your help!
  10. Measure lattice diameters

    Hello I have made a lattice optimization. Now I would like to measure the diameter of the lattice beams. Do you know how to measure them? I thank you in advance for your help!
  11. Hello Currently I have a problem in the topology optimization of a bearing bracket. It has two components: non design and design component. The topology optimization is feasible, but there is no connection between the non design and design part. In the two pictures you can see, that the design part around the four holes only exists by the most minimal density. For the moment there is a contact 'TIE' between the non design and design components. Do you know how to connect the two parts, to get a topology optimization which connects them? I thank you in advance for your help!
  12. Hey guys, I was wondering if it is possible to setup the following optimization problem. Lets say I have a set of nodes and bar elements. This framework has some loads and boundary conditions. I am not sure if the node position of each node is optimal regarding compliance. I would like to define "shapes" for the nodes where I can set some pertubations e.g. Node x can move in a sphere of radius y. I have not seen this kind of optimization although I think it must be possible from an algorithmic point of view. Any suggestions? Thanks!
  13. Dear all, I am trying to run a composite size optimization. I want to find the optimal thickness of each ply I have created in my laminate. My model consists in shell elements. I only have created one laminate that have multiple plies. I want to optimize each ply thickness. I tried with the "ply thickness" and PTMIN and PTMAN but did not work (minimize mass subjected to displacement). No iterations are run and it just gives me the results of a normal FEM analysis. Any idea why? Or how should I do it? Second question..I inserted the control card "global output request" CSTRESS CSTRAIN CFAILURE. The first two work fine, but I can not see the results of Composite Failure after the FEM analysis. It just gives me all value of 1. Any suggestion on how I can see the failure results of the composite? Thank you very much!!!!
  14. I need to define a response to sum up the stress values of all the elements in a component. What is the best way to do it? How the design equation should be defined? Thanks, Soraya
  15. Hi, I recently noticed the Lattice Optimization option in the Topology tab and was wondering there any tutorials on how to use this tool? I've carried out lattice optimization by editing the DTPL card but was wondering if this is a more integrated approach.. Thanks in advance, Tom
  16. Hello, I am trying to run a topology optimization study on a model with non-linear geometry (large displacements). I am applying my loads by imposing a force via NLOAD1 Card Image. However, whenever I run the study, I receive the following error: ERROR # 4003: Abnormal termination in NLGEOM subcases. I have no idea what this error indicates, and I can not seem to find any other online resources to help me troubleshoot. The check screen output is shown below: Additionally, here is my NLOAD1 definition: And here is my Non-Linear subcase definition: Please let me know if you can help me identify the source of this error. Thanks in advance! Branden
  17. Volume of topology optimized model

    Hello! Is there a way to see what is the exact volume of the topology optimized model? There is the option with Tool > masscalc, but there it shows only the volume of the origin model without the toplogy optimized geometry. Please correct me if I am wrong. Can it be seen in the .OUT file or in the .H3D file? Would it be possible to plot the volume as a function of the iteration steps? Thank you in advance for your help!
  18. Hello! I am trying to do Free Shape Optimization of Large Displacement Non-linear Mooney/ODGEN material using EXPDYN and ultimately ELSM for equaivalent static load method as shown using OPTISTRUCT solver. I have setup model for EXPDYN using MAT1 and MATX42 with XSTEP in Sec with TA0=0.0 and DTA = 0.005 and TTERM = 0.05. I have contact surface defines by FRICTION with nu = 0 & 0.3(case-2). But i am getting error of INITIAL PENETRATION. I have seen earlier answers and removed penetration but still error is there. I have tried with TIE contacts as well.(.OUT and .rad file attached), but it is running for hours and no output is generated till. I want to know where i have made wrong. and If you could tell me how ELSM in OPTISTRUCT works? Could anyone please help me? Thanks in advanse...! RubberGasket_Opti_001.out RubberGasket_Opti_002.out RubberGasket_Opti_rad_s1_0000.rad RubberGasket_Opti_rad_s1_0001.rad
  19. Hi, I'm working on a complicated size optimization with many different beams. This script https://connect.altair.com/CP/kb-view.html?kb=41128 seems to be really useful for the problem. Unfortunately, the values of the design variables doesn't reduce during the iterations, which leads to the soft convergence. If I change the initial value near the lower bound value, the optimization works. Of course this isn't an acceptable solution for bigger models. I attached the example file. The initial values are set equal to the upper bound values, so that the problem becomes clear. Could you help me with this problem? Best regards, Kai example1.hm
  20. Multiobjective Optimization

    Is it possible to run a multiobjective optimization in Optistruct?
  21. Interface with MATLAB

    Is there any way to call a Hypermesh model from MATLAB? Is there any interface for them. I need to use my FEA model which is a Hypermesh model in an Optimization MATLAB code. How I can recall it in MATLAB? Thanks,
  22. Hello For a topology optimization the objective and constraints (for example on displacement) have to be defined. Is there a possibility to review them and if needed, change them. For example if a 'dconstraint' is set with a upper bound=0.05, how can the value be change afterwards? Thank you in advance for your help!
  23. Dear all, I am running a topology optimization, but I want to consider multiple load cases at once and not each one separately. Is that possible? How can I insert all the load cases (five) and only solve one optimization considering all of them? Thank you in advance
  24. COG constraint in optimization

    Hello, I am working on an optimization problem and COG is one of my constraints. The COG is defined in 3 ( x,y,z ) coordinates but while assigning the constraint, I am asked to enter only 1 value for upper and lower limit each. When I enter a value, how can I define which axis it will be applied to? Thanks, Muge Candogan
  25. Hello All, I created simple cylindrical shell with a hole at the center and i wanna make this shell stiffer by adding ribs on its surface thus i need to perform topography optimization in order to get ribs configuration and i did as you can see in attached picture. But after i added ribs(stiffeners) to base model and run it under the linear buckling loading , i came up with less critical load than i got from the model without any ribs so i am confused now how it could be possible. I picked objective is to minimize response which was "buckling" is there anyone knows what could be the correct objective to get correct ribs configuration? Aim is to make more stiffener structure under the linear buckling loading.