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Found 49 results

  1. Hi, I am working on a lattice optimization problem for a UAV configuration and I am getting the following error for a series of grid points to which REB2 and REB3 elements have been attached. There is also a SET defined in the model containing all of these points. *** ERROR # 835 *** A dependent d.o.f. of rigid elements should not be defined in ASET. grid id = 23766106 component = 1 I have an idea of how to fix the issue but I do not want to mess up the FEM file as I was not the original creator. Any pointers?
  2. Hı, My question, what is the difference between the following options. These results are calculated according to what? Thank you.
  3. "*** ERROR # 7590 *** LATPRM,CLEAN,QUAD and HS is only allowed for lattice size optimization." Hello, I do a DoE of the Latticeoptimisation. Every Datapoint is a full Lattice-Optimisation(Phase 1 & II ). Parameter: All Lattice Parameter from DTPL(+Lattice) and LATPRM Every time LATPRM, CLEAN is YES I get the Error 7590. When I use Default or "NO", there is no Problem. According to the Help 2019 "YES" is Default!? Attached: - minimal example (Cube) - see Line 52 in *.fem - Result_of_DoE_for_Debug.xlsx Thank you for your efforts in advance Cube.fem Cube_no_error.fem Result_of_DoE_for_Debug.xlsx
  4. Hello, I am trying to do a boolean operation to a lattice structure but I don't know how to do it. ¿Is it possible or I'm asking for an impossible? Thank you very much, Kerman
  5. Hello, is there any way to save my lattice optimization as Parasolid or Step?
  6. Hi, I am attempting to create lattice members using a 3D geometry, I have come across a paper (see attached, pages 3 and 4) that uses the mesh to create derivative bars and nodes, I'm wondering if anyone knows how this could be achieved within Hypermesh and would be willing to talk me through the process. Kind Regards, Laurence Finite-Element-Mesh_Based_Method_for_Modeling_and__(1).pdf
  7. Hi, I have a structure that is composed of many CBEAM elements, all of these CBEAM elements are under one property and one material. I need each of the individual CBEAM elements to have its own property and material. Is there a way to automate this. I have ~9000 beams. I could lower the number of beams to something manageable so I could organize them individually but this is not ideal. The end goal is to be able to alter the material properties of individual CBEAM's, E1 for example, simulating progressive damage with progressive lattice failure. Can anyone help? I have attached my .fem and hm for your visualisation. Kind Regards, Laurence clevis2.0run.fem clevis2.0run.hm
  8. Hi, I am attempting to create a lattice structure using CBEAM's. I have created a box geometry and filled it with CBEAM's. This was achieved by solid map meshing, then using the mesh to create CBEAM's. However, I have now applied some BC's and when I run my model I get the message: *** ERROR # 1203 *** in the input data: Vector defined in fields 6 - 8 has zero length. I believe that this has something due to the orientation of by CBEAM's but because I have so many CBEAM's I'm not sure how I would correct the orientation or what to correct the orientation to. I have attached my *.fem file. If someone could have a look I would be very grateful. Laurence Lattice_trial.fem
  9. hello to all .Can anyone tell me how to view design violation error after lattice optimization-(i am getting often). How to view that what design violation one has made? and also i want to ask that is there's a standard procedure or method to do lattice optimization? I didn't found any relevant document explaining the issues.
  10. Hi Guys, I'd like to share "Tips and Tricks" regarding Lattice Design and the NonDesign Space. First to mention: Please keep Inspire updated - we introduced Lattice in 2017.3 but the last few months, we put a lot of effort to increase performance and stability! ATM (April 2018), 2018.1 is best to work with! If you are unhappy with the "resolution" of your nonDesign spaces after a lattice optimization - you can manually force the nondesignspace (per part) to use smaller elementsize inside the model configuration: Comparison: Before: After: Furthermore, you can create a smoothed lattice before you export it as an STL: Regards, Felix
  11. Hello everybody, I'm trying to make a very simple optimization of a cube (design space) between two thin plate (non-design space). I applied a vertical load on the upper surface and I constrained the bottom surface. So just make it easier to understand it seems like a cubic sandwich. When I start the optimization it ends but a yellow triangle comes out in the result window so it seems like something goes wrong. Can someone help me?
  12. Hello everybody, I'm preparing my master thesis using the software Optistruct 14. I need to use the lattice optimization tool but I don't understand the difference between the 4 types of lattices. I tried all of them and the geometry seems a bit different but I would like some further details about that.
  13. Hı, I am trying to perform a simple lattice optimization using optistruct. I could do OS-3300: Using the Lattice Optimization Process in OptiStruct model. But it is not enough for me to understand. I tried to myself on various model but it made error. Can you help me in terms of example or suggestion? Thank you, Good work.
  14. Hi, I was wondering if there is any way to convert a solid part into a lattice structure without any optimization. In my analysis, I am considering a cylinder which it has an outer layer made of lattice. To perform the analysis, I want to have a lattice structure in outer surface. so would it be possible to model a lattice part in Hyperworks? Thank you, Soraya
  15. Hı everyone, I want the part of the model to contain a completely lattice structure. But my model are empty places. Could you help me?
  16. Hı everyone, I am trying to do lattice optimization with different types. I'm using hex mesh for design and tetra mesh for non-design. I I can see the different types of lattice in the design structure. But when I check the displacement values, I don't see any difference. Can you help me for this problem? controlarm.pptx
  17. Hello, I am working on optimization of prosthetic wherein I am filling my optimized structure with lattice. And this is my final project for masters. So I wanted to know what kind of lattice is being used by the solver. Is it the Octet Truss Lattice, or something else? Best, Tapan.
  18. 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
  19. Hello everyone, I am currently working on a lattice structure made of beam elements and I would like to split all those elements into two, in order to increase the mesh's density. So far I have found how to split 1-D elements by drawing a line... but considering there are close to 26 000 elements, this method is definitely not ideal here ! So my question is: is there an easy way to select all the 1-D elements and split them into two "in one click" ? Thank you in advance for your time. Matthieu
  20. Hello If there is a mesh file(like obj or stl files)or coordinates of beams,just like the pic below,how can i build a lattice structure(replace each edge of mesh with a cylindrical beam) in the OptiStruct quickly? I thank you in advance for your help!
  21. Is it possible to run a multiobjective optimization in Optistruct?
  22. Hello, I have a question about the new function topology optimization with lattice: Can the lattice density be variable? I saw that I can set the bounds of density where to put the lattice structure, but has it all the same structure? or can the lattice structure be variable with the density? Thanks
  23. Hi everyone, I want to do a convergence study for two components ( 1st Solid component and 2nd lattice component) I have attached the pic of my components together in one picture for your reference. First I want to do a mesh convergence for lattice to find out optimial mesh for the component with the same E and density values , Similarly I have to do a mesh convergence for solid component same like lattice. My Question is after finiding the mesh convergence study what I mentioned above I have to make a covergence study regarding E modulus, In order to tell how much the E has to be reduced regarding the density of Lattice component to reach same behaviour of solid component. How I can proceed to do convergence study regarding E modulus that the LS block and Solid-block have same behaviour. A help would be really appreciated. Anticipating a good response for experts. Thank you . Kind Regards, Muthu.
  24. hello to forum members, Problem encountered by solver: Fatal error encountered. About structure: Stucture - Cross size: 12*12*18 mm material : Ti alloy using MAT1 and MATX Property: PSolid and Psolidx(when using it, error is coming) Load collecter: NLPARM is used MY questions is my way of solving correct? which type of non-linear analysis is required (implicit or explicit) in such structures? what is meant by fatal error occurred and how to remove it? For CTETRA elements, Isolid (in psolidx) is not provided any value. does it means it has to keep off and other parameters such as imsrtr and icpre and iframe has to provide some numerical value? if so then what values should be chosen and why? there is no tutorial for solving such problems with Radioss. hyperworks help is not regularly updated In Matx card, is it necessary to provide values to all the parameters like a, b, c, epsmax, N, sigmax? I am uploading .hm file with the issue. I need sincere assistance as this would help me completing my research work. Thanks and Regardscross_669.hm cross_669.hm
  25. Hı everyone, We are trying to do lattice optimization with different types. We tried every way, we thought. And we get different errors every time. Finally we have made the hexa mesh using another program. And then solved in Optistruct. Although there is no problem in the solution, the lattice.fem file does not occur. Could you help me? Thank you.
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