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Found 143 results

  1. leozzy

    B Pillar Optimization

    Hello Everyone, I urgently need your help. I have to do an optimisation of a B-Pillar which i have already simulated in Radioss according to 3 point Bending. This was my first time with hyperstudy so i guess i did many thing wrong by defining output responces and contraints i guess. The aim is to hold the intrusion level same and minimize the mass of the structure. I would be really appriciated if someone could help me. i ll post some screenshots here because somehow i cant save the hyperstudy file. Actually i can save but cant open again. It gives error. I just added the size parameters. Shape parameters i will add them later when i understand how hyperstudy works exactly After nominal run i tried to evalute the study But i get this error : Full folder is in the attachments. I need urgent help to finish master thesis. Thanks in advance
  2. Hi everyone, I'm trying to set up a model for an optimization problem and in the model I have CHBDYE surface elements for the heat convection. When I try to run the optimization, I get the error message 'CHBDYE surface element can't exist in topology or free-size design domain.' Does it mean that I can't have those elements on my design space or should I define them in another way? Best Regards Mert
  3. Tholamm

    Time of calculus

    Hello, My question is about the time of calculus on Inspire. I've started an optimization calculus yesterday on my project and it was finished in about 2 hours. After that, I wanted to check the difference in the optimization after activating "optimization" in the property windows of the 8 nuts in my model and the optimization is now running for 16 hours. Is this normal ? Thanks in advance
  4. cemreyvz

    Changing hole location

    Hello, I am quite new to hypermesh and I want to create simple solid beam which has a hole and then I want to move the hole. I have built the model in hypermesh and added all the constraints, I have tried morphing but it deformed my meshes while moving the hole by making my beam longer. Would you please help me about which modules I should use? I am currently trying to figure our hyperstudy parametrization
  5. YaoLun

    Error 312

    Sorry.I'm confused about how to connect two components,leading to problems below. And i attach the hm file,could you help me check or correct it to run it? Thanks! Messages for the job: *** ERROR # 312 *** In static load case 1 the compliance is negative or large -1.37409e+011. Optimization/buckling analysis cannot be performed. due to possible rigid body mode. FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED). 1.hm
  6. Sir can you tell me ,how can i calculate th6 NODED 11 MEMBERS TRUSS.hme weight of members of the optimised truss in the result window?I am attaching my file for you.
  7. 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
  8. 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.
  9. smare104

    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,
  10. Aslan

    Lattice Structure

    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?
  11. I am optimizing the radius of the lattice structure. How can I use other optimization algorithms? For example, Method of Feasible Directions (MFD), Adaptive Response Surface Method (ARSM), Genetic Algorithm..., and what is the default optimization algorithm?Thank you very much!
  12. Hello community, I got a little bit confused while reading the OptiStruct 2017 User’s Guide. There I found that OptiStruct selects automatically the best optimization algorithm. Five items have been listed there (page 10-11): - Optimality criteria method - Convex approximation method - Method of feasible directions - Sequential quadratic programming - Advanced approximations . My question is: Does OptiStruct still selects the Optimality criteria method automatically? And for which type of optimization? There is no information about it in the User’s Guide or Reference Guide. I want to optimize the topology of the 2 dimensional MMB-Beam (see atteched figure). My objective is to minimize compliance subjected to a volume fraction constraint. I found that for my type of problem I shoud use 'OPTMETH=DUAL' since I have a large number of design variable and only one constraint. So I cannot choose the Optimality criteria method in topology optimization? Many thanks in advance Nahid
  13. Hi, The problem consists of a connecting rod submitted to axial loads which define the phases of admission (traction) and combustion (compression). I am trying to run the following optimization: 2 load steps : linear static (traction) linear static (compression) 2 responses : Volume Compliance 1 constraint : 60% Volume 1 objective : minimize compliance Without combining the two load steps, I managed to run the optimization. I couldn't find a way integrating the two load steps for the optimization. I found that the only time that I can include the load step is when I define the objective. However only one load step can be selected. Therefore I was wondering if there is a way to integrate both of the load steps mentioned earlier. Thank you !
  14. Hello, I'm currently trying to optimize the laminate of a cfk part with the free sizing optimization. At the end of the run it states "OPTIMIZATION HAS CONVERGED" "FEASIBLE DESIGN (ALL CONSTRAINTS SATISFIED)" but the programm is just reducing the mass while the displacement constantly gets bigger and is far bigger than the max displacement constraint I set for the optimization. The total displacement constraint is set to -2mm. Min ply thickness is set to 2mm and max 50mm.
  15. Hello everybody, I have a problem with optimizing in hypermesh (optistruct). I get the following error message: *** ERROR # 5617 *** The SUBCASE ID in ATT1 field of DRESP1 1 does not refer to a modal FRF subcase. *** Run terminated because of error(s) in the input data. I actually did the same as in tutorial OS 3010. I hope you can help me My model is attached pangelo.
  16. Hi All, Is it possible to perform topology optimization based on the response from transient analysis. If so, for stress response what should be the Response Type? Thankyou N.K
  17. Hello every one, I'm running a topology optimization with a min compliance and volume or mass fraction constraint. Do you know why the mass or volume fraction recommanded is 0.3 or less? Best regards, Lucy
  18. Hi. I am new to this software and i got an error which read: *** ERROR # 1000 *** in the input data: Incorrect data in field # 4. The element in question is a CTRIA element.
  19. Sulaiman

    Optimization in WinProp

    Hello, How can I implement my own optimization algorithm in winprop? It is worth to mention that I want to use the algorithm for sites placements depending on several factors like Power, Data Rate, Capacity... etc. I tried using OptMan but there are no resources in that on how to use it. Thanks.
  20. My model is a simple 1D PBEAML element structure (BOX beam sections) assigned for linear static analysis. I was able to assign design variables and property relationships for beam thickness 1 & 2. Then I assigned the optimization response for all nodes and constrainted them by lower/upper bounds ±25.4 mm under the objective of minimizing mass. With these steps, I was able to reduce the weight of the structure as well as meeting my displacement design criteria as closest as possible. However, the issue is now the stress increased beyond the yield strength. So I went back to my model and added the optimization reponse for static stress for all properties and constrained them with lower/upper bounds -234.4 MPa and 289.6 MPa (compressive and tensile yield strength). I made sure the response and loadsteps are assigned to the optimization constrain properly. After running the optimization, I checked the results in Hyperview, but it doesn't seem like the stress part hasn't been assigned correctly. I'm specifically looking for constrainting Element Stresses (1D) (s) - CBAR/CBEAM Axial Stress. It seems like there are other types of stress you can assign besides the static stress, such as frf stress and psd stress? Please help me.
  21. Hello,Forums I am doing analysis of a unique CFRP pipe by Optistruct. I am receiving this following error message: *** ERROR # 605 *** Element 1 is referenced by STACK 1 (on PLY 1) and by STACK 2 (on PLY 5) simultaneously. Different stacks are created by dividing the upper and lower areas of the pipe into sets. There seems to be an error because it refers to the same element Is there any good way to do it? (Modeling is possible but analysis is error) CFRP-PIPE-Asymmetric laminated.hm
  22. Hello, I run the optimization without errors. However when I check the results in the iso mode, the final step shows an model without elements already at an iso-value of 0.02 (only the non-design elements left). What am I doing wrong? The hist.mvw and the .out files attached belong to the mvw and hm files (when saving I only changed the version from 2 to 3). Could anybody please help me? Cheers Daniel Gepaecktraeger_2_optimization.out Gepaecktraeger_2_optimization_hist.mvw Gepaecktraeger_3.mvw Gepaecktraeger_3.hm Gepaecktraeger_2_optimization.mvw
  23. 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
  24. Hı, My question, what is the difference between the following options. These results are calculated according to what? Thank you.
  25. 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
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