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Found 626 results

  1. Hi I'm trying to run a mass optimization and in my first attempt I found this error and I don't know what it means. Can you help me? *** See next message about line 210888 from file: C:/Users/A/Documents/T/E/file.fem "SPC 2 0 123456 0.0" *** ERROR # 1000 *** in the input data: Incorrect data in field # 3.
  2. Dear all, I'd like to ask you for help regarding specific contact simulation. Please have a look at the sketch below (I know that this particular case can be easily calculated analytically ). There is a L-shape profile (on the right) which is screwed in to a flange on the left. There are two types of connection: Pin connection - pins transmit shearing load (red) Bolted joints which ensure flanges integrity (blue) There is also a contact plane marked in yellow. I have modeled pins explicitly with merged nodes between flanges as shown on the figure below. My question is how to model the contact between blue and dark yellow elements? Ideally it would be kind of no separation contact so both surfaces remain fixed but no shear load is transmitted. I want the pins to carry all shear load and I'm not interested in the bolts assessment. There is a nice presentation about optistruct contact settings - Optistruct Contacts.pdf And even contact type "NOSEP" is described but I can't find it in my v13. Could you please give me any advice? Thank you in advance.
  3. How to get RMS values of output plot in random response analysis in optistruct? Pls suggest suitable control card to get rms value
  4. Hello, I am trying to run the Optistruct Tutorial OS 2098 with the MBD excavator arm. The analysis works fine, but optimization unfortunately not. Doing everything like in the tutorial, I get errors you can see in the attached output file. Decreasing h_min in the Load_Collector doesn't help. Like it is recommended in line 1062 in the output. But if i decrease h_min to 1e-14, Iteration 0 is running for hours now. So this could not be the right way to solve the tutorial i guess. Is this the only big error? Or are there others I can solve? Would be great to get this tutorial running, because my goal in optistruct is to optimize one part in a MBD, too. Thanks in Advance! os_2098_error.txt
  5. I have a part like following the back plate is constrained and pressure is applied to a round surface on top. I have done linear static analysis. and found the deflection, as follow mac displacement= 2.7 mm I have doubled the thickness pressure and constraints are the same as previous one bu the maximum deflection has increased while I expected to have decrease in maximum deflection since I have doubled the thickness and I have more stiffness Max displacement = 3.2 mm I was wondering what can be the reason ? What should be the trend of maximum displacement?? by increasing the thickness should I expect increase in maximum deflection or decrease??
  6. Hi i need to work with symmetry model for simplify the model. I've imported the geometry already simmetric on one plane. What kind of constrains do i have to use for the simmetry? Are the morph constrains? Thank you very much
  7. Hi I have done this modeling in optistruct (an enforced displacement is applied to the back of plastic clip and required force for this this displacement is asked) but when I run the model and post process it in Hyper view I see the the clip penetrates in to the sheet metal. I think this penetration makes the results invalid. Would you please let me know what is wrong with this modeling. The model is attached I have defined contact between all these surfaces but I don't understand why it behaves like this 6.hm
  8. Hello, I am a member of a Formula Student Team from Metz, France and I'm new to Optistruct and to the optimization of laminates. I'm working to optimize our carbon steering wheel. The analysis was done but i have an error when i'm trying to optimize. I have two optimization response ( mass and static displacement), my optimization constraint is a displacement of 1mm of two nodes and my objective is the min mass. I share my model. My error is : *** ERROR # 2148 *** Invalid design problem. All the sensitivities of response 1 (objective) are zero. Any ideas about a possible reason for this error? Many Thanks, Olivier Hagmann Volant V1.rar
  9. Hello all, I'm trying to carry out an optimzation with optistruct with applied forces and displacement contraints but come across error 318. The attached images show the BCs desired and my settings for the SPCs. During the Analysis step, the process completes without any error but the optimization step returns following error: *** ERROR # 318 *** Static load case 1 has nonzero applied loads & prescribed displacements. Optimization with compliance cannot be performed. Somebody who can guide me about this issue? Thanks for your help, suggestions as well as advice! regards.
  10. hello everyone, i am new in optistruct , i solve simple linear static problem i have some error issuse in {" SID 1 used on Case Control data SPC is missing in bulk data. *** Run terminated because of error(s) in the input data."} how rectify this error , here i attached .hm file please check it linear.hm
  11. Hello, I would like to know how to create a macro (script) using OptiStruct and HyperStudy for dynamic analysis (modal, harmonic and transient) of a free cantilever beam 1D. How to create / import geometry, put materials and properties, meshing, put loads and run the analysis. Thank you
  12. Hello, when I run thee analysis on my model, I get the message: ************************************************************************ A fatal error has been detected during input processing: *** ERROR # 640 *** STACK 1 is incorrectly or ambiguously defined. This could be due to disconnected substacks, duplicate interfaces or inconsistent interfaces orientations. Please verify the substacks and interfaces thoroughly. ************************************************************************ ==== End of solver screen output ==== ==== Job completed ==== In my model I got six plies called that have no material real material (material with parameters = 0), I just used them to create an Interface laminate and to connect the plies in a proper way. If needed, I can also translate the notations into english if needed. Felgenbett_Heiss.hm
  13. Any Idea, how one can perform fatigue analysis of structural ceramic materials? Thanks.
  14. I am trying to run an optimization of a design and I am receiving the error code: *** ERROR # 157 *** Error opening the scratch file "./optimization1_10188_01fm.rs~" Fortran error code = 9 This may be caused by not having the access right to open the file, not enough memory left for the system routines, or some other system setup related reasons. This error was detected in subroutine opseqsav. The computer I am using is running windows 8 with an Intel i7-4700MQ and 8GB of system ram.
  15. Hello Forum, A) OS-1380: Computation of Equivalent Radiant Power In this Tutorial I would like to know Step 2: Create ERPPNL 2.Click review and select ERP_elem In this step what criteria is used to select /specify the ERP elements. B.) For topography optimisation does optistruct implicitily reduces the ERP of component or is there is method to set this as the objective. with Regards Pratik
  16. Good evening to everyone, i'm trying to run a topological optimization but it doesn't work. looking at the .out it shows that a problem occurs in the design variables, the message is: "NO DESIGN MATERIAL OR DESIGN VARIABLES FOUND: ANALYSIS ONLY" after that the code prosecutes with the linear static analysis. The design property related to the desvar is a PSOLID; the analysis regards a mass minimization with a boundary on the maximum stress. many thanks for your help, Andrea
  17. Hi, I performed topology optimization (Upper bound displacement and minimize volfrac). But I am having problem in interpreting results. Please clear following doubts: 1) Results are very irregular. It doesn't show some material removal in some uniform shape. 2) Which iso-value should I consider? What is the use of it? 3) When I try to export it using OSSmooth, It takes input of .GRID file which I couldn't find anywhere in the folder. How do I get that .grid file.
  18. Hello, I want result of frequency response analysis in real and Imaginary form in H3D format. I have specified this in load step and also in Global output control . but still I get output in Phase imaginary form. I am want to use this Vectors Real and Imaginary further in Hyperstudy to do Model updating where I have defined my own criteria. Regards Pratik
  19. Hello I want to a component which will be tested using laser velocimeter and "Normal surface velocity" will be measured. (at some points on surface of the component) I want to have this parameter "Normal surface velocity" as output from directresponse analysis or Modal analysis from optistruct. Is it possible to have it. Thanks and regard Pratik
  20. Hello, I want to ask you that, the door which i have to optimize. I am doing it with size optimization by taking the thickness of shell elements as variable. But i am not achieving my desired results. Is there any way that, I could take the height of ribs (within the door) as variable ( door thickness as variable) which will give me desired natural frequency of the door ??? Please reply me as soon as possible with detailed answer. Thanks in advance. Regards, Hassan Razzaq
  21. 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
  22. Hi there, i ran an composite optimization in Optistruct and now i want to analyse if the Geometry fails in RADIOSS because the Failure Criterion (PUCK) isn't available in optistruct. Anybody knows how to do that?
  23. Hi community! I am new to the Hyperworks world and currently trying to perform a sensitivity study using Hypermesh, Optistruct and Hyperview. Eventually I would like to compare the displacement of a certain set of nodes for each simulation. Ideally I would like to automatically output this information in a txt or csv file which I then can analyse and compare in Excel. Is it possible to specify in Hypermesh that an additional file is created containing a certain set information - maybe using "output block"?? Or do I always have to go through Hyperview or a macro? Thank you very much for your help! Happy Easter, Weltenbummler Btw.: I found other topics in forum about this problem but havent quite found the answer that I was looking for. So please excuse the double post
  24. Hello Group I wanted to know whether its is possible to define output as a constraint in optimisation. I am validating my modell with frequency response test I want to vary values of Material properties like Emodulus, G modulus so that at certain frequencies Frequency Response Function FRF (velocity) is say (+\- 10 % ) of the FRF calculated by test. eg Vary values of E = 1000 mpa to 2000 mpa G= 200 mpa to 400 mpa so that at node 256 Frq frf (test) frf(simulation) 5hz 0.256 (+/- 0.01) of 0.256 10hz 0.586 (+- 0.01) of 0.586 15 hz 1.457 (+- 0.01) of 1.457 etc Is it possible to define constraint this way a suggestion or example tutorial would be quit helpful Thanks and Regards Pratik
  25. hello im triying to do a topography optimizaiton using ERP as a response, and a minmax objective. when i try to solve it i got the following error: *** ERROR # 2148 *** Invalid design problem. All the sensitivities of response 1 (objective) are zero.
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