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Overhang Constraint for Topology Optimisations in HyperMesh
Hello, I wanted to ask how the overhang constraint is defined (within the Topology optimisation design variable card) within Altair HyperMesh when running a topology optimisation. I am designing a part for metal 3D printing and the printer cannot print within 30 degrees of the build plate, as shown in number 3. However the…
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How to retrieve a multi-material mesh with OSSmooth
Description: Hello, I am running multi-material topology optimization in OptiStruct and I want to retrieve the results into HyperMesh to run validation analysis. Is there a way with the OSSmooth tool to get a unified result but with mesh distinction (not different size but different component assigned or property) for each…
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Is there a way to couple all material properties to density in multi-material topology optimization?
Description: Hello, I am a student doing a master's thesis on multi-material and multi-objective topology optimization. I have successfully done both separately using Altair Hypermesh and OptiStruct, but now I was trying to achieve multi-material multi-objective topology optimization. I am trying a thermo-mechanical…
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Hyperlaminate, Laminate PCOMPP Free Size Optimisation Problems
I'm having some issues performing a free size optimisation on a monocoque I'm designing in my spare time. I have made a working laminate structure using Hyperlaminate, this effectively places my laminate directly into the PCOMPP Property card, which is perfect when performing a simple analysis. However when I got around to…
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PolyNURBS fitting for a large structural connector with multiple integrated fixed components
I have successfully optimized the structure; however, I am struggling to generate a functional geometry from the results. Before I attempt to manually reconstruct the NURBS, do you have any suggestions? My primary issue is shrinkage at the fixed interfaces, and the resulting NURBS surface is often non-manifold or…
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Stress relaxation in topology optimization
Hi, Does OptiStruct apply a stress relaxation for elements of a lower density in order to avoid highly stressed elements which don´t contribute much to the structural response? This is of interest for example when stress or strain constraints are applied or if my objective is to minimize the maximum stresses. I can not…
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How does the fatigue constraint influence the topology optimization result?
Hi, I was wondering how the fatigue constraint, which can be set in the DTPL card for a topology optimization, influences the topology optimization result. In the out. file, I can tell that no sensitivities are calculated for the fatigue constraint, only a check is included. However, the final result with/without fatigue…
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Why does the optimization not work properly around non-design regions?
Description: I have tried running a topology optimization, however, i sometimes get that the optimized component has strange geometries around my non-design regions. As you can see, the area around my non-design region was previously round, and became hexagonal after optimization. Reducing the minimum thickness constraint…
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Prise en compte de DOPTPRM DISCRETE | couplage FLUX - Optistruct | Optimisation topologique
Hello, I am reaching out because I am encountering an issue during my topology optimizations. To give some context, I am coupling Altair Flux with OptiStruct to perform a magneto-mechanical topology optimization. The coupling works correctly and I am able to obtain several results. However, my goal is to modify the…
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Help with running Optimize in Inspire
I have a new install of Inspire that I am following tutorials to get familiar with the UI. I ran an optimization this morning that produced some results but were different from the tutorial videos results. I ended up remodelling a part of the structure as it was extruded in the wrong direction and when I ran the next…
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Best way to parametrize electric motor?
Hello, I am designing an electric motor and I am looking for the best solution to parametrize my model in order to study the effect of several geometrical lengths in my design. At the moment I am working with SolidWorks, but SimLab does not allow me to change its geometry in a parametric way. Therefore, every time I want…
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Penalization SIMP topology optimization in Flux v2024
Hello, I am reaching out to clear a few doubts on the way topology optimization is implemented in Flux v2024. When using the SIMP method, what is the penalization applied to? Relative permeability, reluctivity or something else? If possible, I would also like to know the interpolation scheme used for the parameters(s). In…
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Using multiple LAMTHK constraints in DSIZE Card
Hello, I’m having a small issue with composite optimization. I need different thickness constraints on my part during FreeSize and Size optimization. The HyperMesh help site mentions that it’s possible to assign multiple LAMTHK constraints to one DSIZE card, but I can’t figure out how to do it since there is only one field…
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Need help with Optistruct run failed with Error No - 2148 in Inspire. Loads aren't properly done.
I have had this same error for 10 plus runs, changing forces, removing some forces, inspecting supports, changing force values, changing topology optimization material removal percentages. I use maximize stiffness. I have used this in the past, with very similar setup and have never had this problem. I understand what it…
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Convergence tolerance topology optimization in Altair Flux v2024.
Goodmorning, I'm reaching out to the community to address an issue referred to a parameter for topology optimization in Flux 2024. When setting up a topology optimization, in the part of the optimization options there's a field where the optimization tolerance can be set. The default value is 0.5%. But when I change it and…
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Optimization Tutorial Issues
Hi all, I've recently gained access to Optistruct and have been working my way through the tutorials. I'm now on the optimization module, but the topology and topography examples fail every time. They reach 100% completion, then stall for for 45min-1hour and before displaying the message: "Optimization Error. Please…
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Flux 2024 Topology optimization through PyFlux
Hello, I have a question related to topology optimization in Flux 2024. I would like to launch the optmization manually, by writing a .py script and running it in the Python editor zone of Flux. I need to run it manually because I would like to use an input .fem file that is not automatically generated, rather written by…
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Design Explorer optimization fails with EXPRESSION_ERROR when minimizing buckling factor in Altair I
Hello everyone, I am currently working with Altair Inspire and using Design Explorer to optimize a simple structure. Context: I run a static analysis + linear buckling analysis manually, and both solve correctly. The geometry is defined wuth the design variables in Inspire. The model is very simple and the analyses run…
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free shape optimization
I am currently performing a free-shape optimization of a structure. The constraint I set is a maximum allowable shrinkage of 8 mm during optimization. However, during the calculation, it only iterates once, and the optimization stops as soon as the maximum deformation from the shape optimization reaches 1 mm. What could be…
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Altair Flux 2024 Topology optimization - definition of mechanical problem
Good morning, I'm performing a Topology optimization in Altair Flux 2024. I'm working with a SPMSM electric motor and i have a doubt about how to model the mechanical problem for the optimization. I defined the rotor as mechanical region, with E, nu, and rho. Then I set the boundary condition: Fixed for all the DOFs at the…
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Flux 2024 Topology optimization - definition of element densities
Goodmorning, I'm working with Altair Flux 2024 with topology optimizations. I performed an optimization of the rotor of a SPMSM and I would like to perform another topology optimization on the previous design result. In particoular I would like to use the same densities of the design produced by the first optimization as…
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hyperstudy: Error in Running several optimization with same model with Excel
Hello, once I have defined a model in Hyperstudy with Excel, It works well to do one optimization. But then, I want to run a new optimization, I always get this error that it cannot find the excel, and thus cannot run the optimization. And the Excel is there, so I dont understand. See images for more info. Thanks a lot!
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I'm having issues with my solvers licensing
While I'm fine following the steps to check my student's license in hwDesktop applications, I'm encountering issues the time I try to launch any analysis in Optistruct and therefore trying to use HyperStudy module. How can i solve this issue? Thanks in advance.
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White paper-Multi-Material Topology Optimization for Automotive Applications with Altair OptiStruct™
Topology optimization has become an integrated part of the design cycle where light-weighting and robustness are important for vehicle structures. With advances in novel manufacturing methods, it has become easier to manufacture parts and assemblies with multiple materials, like over-molds of plastic and metal, hybrid…
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Topology Optimization X structur due to torsion
Hello everyone, for my thesis, I'm performing a topology optimization on a train car. I have different load cases, such as a compressive force or the effect of the car's own weight plus payload. In one case, the car is lifted at three of its four points, so that it's tilted in the air. This is meant to simulate a torsional…