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      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 24 results

  1. Topology optimization error

    Hi All I am getting this error in topology optimization data check : Card "WEIGHT" is not allowed for this subcase type It's a 3D Solid problem with Wcomp and Volfrac, minimizing Wcomp and 0.3 Volfrac
  2. Aircraft Wing optimization

    Hi, Does anyone have any tips on how to go about optimising the internal structure of an aircraft wing? I am a very new user to Hypermesh. Thanks.
  3. Hi, So while reviewing the result of topology optimization in hyperview we have two different pages showing design history (densities) and the subcase result (displacement and stresses). How can i plot the contour value of stresses or displacement while at the same time showing the iso-value of densities (optimized shape)? Thanks! bayupu
  4. Hi, I am doing topology optimization for a cantilever beam and I want to know the mass reduction after optimization. Does anyone know how to calculate the mass for optimized result. In lattice optimization , I can import the .fem file into hyperworks and calculate the mass. But for topology optimization, it didn't work. Is there anyway I can calculate the mass for topology optimized results. Thank you, Regards, Soraya
  5. Optimization constraints

    Hello, I have tried running a topology optimization on a simply supported beam. I defined the objective as min. mass but did not introduce any stress or deformation constraints. And the optimization gave results. Is it possible to run a topology optimization without constraints? Then based on which parameter the software optimizes the structure, does it automatically introduce constraints by itself? Thank you, Muge Candogan
  6. Topology optimisation

    Hi, I am new to Hyperworks. I am getting Error 2148 "All the sensitivities of response 2(objective) are zero. Also: 1)I put a pressure across each element on the circles as I want a distributed load of 150N on each circle. Is this correct? 2)In reality my beam is welded on each end. Are my degrees of freedom correct? I have attached the file. Thank you. U Beam optimisation.hm
  7. Query about OptiStruct Topology Optimization

    Hello, can you tell me? I am not getting the complete result of my topology optimization. I wanna do topology optimization of the differential case of differential gear box. My FEA analysis is fine but optimization results are showing only in blue and red region form in element density. and how to compare of our final result from our original model that how much material we can or did remove from the model?
  8. Hello, I am solving an optimization problem of an automotive alternator bracket which is circular in shape. The cyclic rib formation (material removal as defined by ucyc) occurs only for a certain load values. It doesn't happen for either higher or lower load values. How is this possible?
  9. Hello, While solving a topology optimization file, I get the following error mesage: A fatal error has been detected during input processing: *** See next message about line 409 from file: D:/Optimization - Weight Reduction/Final/101/s101-5.fem "SURF 3ELFACE" Syntax error(s) found in bulk data 'SURF' card. Unable to understand what does it say? How to resolve this?
  10. I'm doing a very simple optimization. The model is constrained at the fixtrue holes and a load is applied at some nodes on one face. I set my optimization objective to minimize the volume and established dconstraint for the displacement not to exceed 2mm. I run opimization, get feasible design and convergence but my displacement responce curve seems to diverge. Below there're three graphs of my results. In the case of convergence it should go down, not jump arround and go as high as 30mm displacement. Constraint violation stops signaling too and it takes 27 iterations to finish (doesn't even need to go up to 30 iteration default limit) Analysis log.txt
  11. Error in topology optimization

    Hi everybody, I'm a new in the Hyperworks and Optistructt and I made some tutorials correctly and learned how to use some features of the program, but when i try to optimize a RC airplane wheel, all the elements of design space disappears. I tried to fix that for two days and so far i didn't discovered anything.... Somebody can help me? i haven't found any tutorial or topics about wheel optimizations, somebody know where i can find? Thanks! Daniel Andrade Federal Universty of Minas Gerais - Aerodesign Team
  12. Hi, is it possible to run a topology optimization when applying rotational forces (computed load according to rotational velocity) Thanks in advance!
  13. Dear all, I am actually working on a tubular chassis optimization and I am a beginner HW. I would like to obtain this kind of result : And actually my result (for only one load case in torsion ) look like : So my question is how to parameter Optistruct in order to obtain a result like a frame ? Thanks, Alban
  14. Dequations help

    Hello Optistruct users, I am attempting to run a topology optimization using dequations as a force constraint. I would like to obtain the reaction forces on a bolt (represented as a CBUSH) and calculate the shear forces on the bolt. The shear forces will be calculated using dequations since we can only obtain reaction forces in DOF 1-6 and shear is needed from both DOF 2 and 3 (in this case). I would then like to use the calculated reaction shear force as a constraint. My trouble is relating the reaction forces to the dequation. How do I reference these forces? I am assuming I will need to reference the node number as well. My other concern is relating the dequation to RESP2. When I try to create a response (using function as my response type) I get the response "a dequation must be selected and edited". I am not sure if this is due to my equation not having referenced any forces with my variables or not. Do I need to create my eqation in Hypermath? Being that the equation I need is already a built in funtion as rss I am thinking I do not need to use Hypermath. Also, if there is a better way to establish the same result I am open to suggestions. Thanks, LP
  15. ERROR 320

    Hello, I'm trying to run a topology optimization on a 3D volume meshed with tetra elements. the objective is to minimize the Weighted Compliance. The responses I've chosen are : - weighted compliance - Vol Frac the constraints are : - VolFrac <0.1 - max stress < 870 MPa (via STRESS input in the DTPL card). I get the following error message: " *** ERROR # 320 *** Static load case 1 has prescribed displacements. The combination of global stress constraints and prescribed displacements is not meaningful. Optimization cannot be performed." I hardly see why it is not meaningful to use global stress constraints with SPCD... does anybody have a solution? Note: the SPCD is applied on a single node which is connected to the volume using a RBE2. Do I have to remove the area close to the RBE2 from the design volume?
  16. Hey all! I hope you can help me! I´m doing an optimization for a university project of a bracket but get no convergence and high constraint violations. The model: See the design volume (blue) in Screenshot 1. The yellow areas are not being optimized. There the loads are applied and the model is constrained at the two yellow areas on the top. I had to use TET10 elements because auf geometrical issues. 6 forces apply to the model. I use quite big elements but this is for doing quick calculations...I don´t want to wait 2 hours to see if it is working... but I think this should not be a problem here?! Optimization: I want to reduce the weight/volume. So objective is to minimze volume (I have tried Mass, volfrac). At the nodes, where I´ve applied the forces (basically in the middle of the yellow areas), I have set displacement constraints (betweent 0.5mm and 2mm). I use min member size controll of 0.4 and a stress constraint of 450(N/mm²) My Problem: The solver always reaches the iteration limit of 80 without converging below the tolerance and ist violating the constraints massively. (screenshot). I have tried to let the solver run 120 iterations but without any usable result. Here are the ones with 120 iterations: When I view the results given by the solver at iteration 80 it looks like it is about to find a solution that looks acceptable in my eyes. but the strange thing ist that the density values of the structure often are below 0.1 and not almost 1 as they shpould be. I have tried to check if it ist because of quite low loads (max about 165N) but with a scale factor of 10 the same element densities appear. Results with density values > 0.05: Results with density values > 0.2: Results with density values > 0.5: Has anybody an idea what I am doing wrong? Should I increase the number of iterations further?
  17. Setting constraint to erp

    hello all I am defining optimisation to reduce erp by topology optimisation. My objective is to find optimum material distribution to have low erp my defination goes as dconstraint: Erp: upper bound > (Target values) #### Volumefrac= upperbound 0.3 design volume objective= minimize design volume Loadstep = Modal frequency Response. ###For this setup I get error selected subcase not compatible with type of response while setting constraint on ERP how do i set the erp as target value. Regards Pratik
  18. OptiStruct Lattice Optimisation

    Hi, I was using the lattice optimisation tutorial in order to complete a lattice optimisation on my own component and it completed the first step no problem, producing the "_lattice.fem" file. However, when I then ran that through OptiStruct, I got the following error: *** ERROR # 1814 *** MASSFRAC response on DRESP1 card 2 is not applied to a topology or free-size domain. Please could you advise on what I should do? Kind Regards, Iain
  19. Boundary conditions for pipe optmisation

    I want to optimisation in pipes of different diameters connected to each other. What boundary condition (like loads and constraints) I can input. If I only want to see topology optimisation.
  20. Hello All, Can anyone tell me how does optistruct uses material data to attain an optimum design? For example: We have run a model for topology optimization with material magnesium and also with material Aluminum by keeping the density same but varied the modulus of elasticity accordingly. How does optistruct uses density/modulus of elasticity during topology optimization ? Its quite urgent, any suggestions are highly appreciable. Thanks in advance.
  21. Geometry clean up

    Hi I am trying to clean up the geometry of a particular solid. When I import the model from solid works to ABAQUS i get an error showing imprecise geometry and hence I'm unable to mesh it. I am therefore trying to clean up the geometry in hypermesh but im unable to detect any imprecise geometry as all edges show green. Can someone tell me how I should proceed in identifying and correcting the geometry Thanks
  22. The temperature that is specified in the SURFACE_INTEGRATED_CONDITION command corresponds to the "bulk temperature". The bulk temperature is defined as: Tbulk = 1/A * INTEGRAL( Â (rho * Cp * U * T) / ( rho_avg * Cp_avg * U_avg ) ) dA. This is a mass averaged temperature. The SURFACE_OUTPUT command returns the area averaged temperature.
  23. Surface outputs in AcuSolve are separated based on surface element shape. When multiple element topologies are present on a single face of a model and surface output is active for both surface element types, the surface nodal output data will contain duplicate entries for the nodes that are shared between the elements. However, inspection of the results will not show equal quantities at those shared nodes. For example, consider an outlet face that has a combination of quadrilateral and triangular elements resulting from prism and tetrahedra volume elements. The surface nodal output for these surfaces will each show an entry for the nodes that are shared between adjacent quads/tris. However, the values shown in the output for the triangles will represent the contribution of that node to the triangle that it is attached to. The values shown in the output for the quadrilaterals represent the contribution of that node to the quad that it is attached to. For the case of a flux quantity, the total flux through that node can be determined by summing the contributions from the triangle and quadrilateral element.
  24. Hello all, I exported a topology result using OSSmooth as an IGES file and it is freaking big (67Mb!).. My student copy of Inventor Pro 2013 cannot handle the file size and keeps hangs with the slightest action (even rotating the model!)..(Iv got a decent laptop config so that not an issue - Dell XPS L502X 8GB RAM i7-2670QM @2.2 GHz) Can someone help me how I can export a smaller, easier to handle .iges file that Inventor will be happy with? Thanks Sooo Much