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

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Found 98 results

  1. 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!
  2. 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!
  3. 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!
  4. 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!
  5. 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!
  6. 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!!!!
  7. 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
  8. 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
  9. 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
  10. 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!
  11. 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
  12. 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
  13. Multiobjective Optimization

    Is it possible to run a multiobjective optimization in Optistruct?
  14. 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,
  15. 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!
  16. 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
  17. 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
  18. 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.
  19. Hello everyone, I am currently running some optimizations for a strucutural component, which I have to write an Essay about. While looking at the eigen modes Output, this question accured: What is the Unit displayed on the scale? It says Eigen Modes Magnitude, but does that mean the oscillation in Hz, the displacement in mm, no unit or another unit? I appreciate any help and hints!
  20. Hello, I am working on an optimization problem of a blade. One of my constraints will be centre of gravity. I would like to keep the cog at 1/4 of the chord. I am having trouble in understanding how to define the upper and lower limits of cg. Should they be the coordinates? If so on whicj plane and how can I define the reference point to find out what the coordinates are? Thank you, Muge
  21. Hello, I am running lattice optimization on certain shapes that I would like to 3D print. I was wondering if a separate tool or software is required/can be used to make the obtained lattice structure manufacturable? What would be the method for manufacturing the varying lattice densities? Thank you, Muge Candogan
  22. Error 789

    Dear community, I have a problem with the composite size optimization if I set a value for TMANUF for the plies. After the free-sizing, I use the sized model to perform a sizing optimization setting a specific manufacturable thickness for the plies involved (TMANUF). The solver is able to run the iteration zero, but it stops giving me the following error when iteration 1 starts. *** ERROR # 789 *** Invalid design properties w.r.t. the design variables were found. number of invalid property items = 6 This happens only if I set a value for TMANUF and also if I delete all the settings for maximum and minimum laminate thickness. Unfortunately, I cannot share the model I am working on. Any suggestion on the matter? Thanks in advance, Alessandro
  23. Dear Community, I find a problem in imposing minimum ply thickness constraint (PLYTHK) during free-size optimization. Whatever value I put in the DSIZE card as minimum ply thickness, this seems to be ignored by the solver and I get, in the resultant size model, plies with thickness lower than the value I specify. I have attached a simple model as example. In the example: Although I set 0.05mm as minimum ply thickness for all the plies, I get plies with lower thickness (e.g, ply 205200 is 0.02mm thick, ply 310300 is 0.0096mm thick, and so on...) in the sized resultant model. Has anybody found the same behaviour? and, has anybody found a solution? Thanks for the support, Alessandro plythk_issue_sizing.13.fem plythk_issue.hm
  24. optistruct

    when i do optimization of an automobile part , this part having more than 200 iteration in optimization result. how to reduce or minimize the iteration in optimization result.
  25. knuckle optimization

    Should I do optimization after model has passed linear analysis or it can be done from beginning? Bcoz when I am doing from beginning then stress distribution are non uniform and thus its removing too much of material
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