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Pedro Neves

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  1. Pedro Neves

    Optimization is really slow

    Hi, I'm having problems with the topology optimization of one brake pedal that I'm trying to optimize. It seems to be all ok with the model, but when I try to run Optistruct the process is really slow, like 30 minutes per interation and my model is relatively simple. I have no idea of what could be causing the problem here, because I did an analysis to see if it was all ok and it seemed to be all fine. I'll have atached my model so you can try to help me and find what is my problem here. Thanks modelo.hm
  2. Hi, I'm trying to do a linear buckling analysis with a 2D shell element. I don't know why, sometimes the analysis runs with no problems (right now, I tried to do it with an element size of 25mm and it gave no problems), but when I try to minimize the element size it gives me the next error *** INTERNAL PROGRAMMING ERROR # 261 *** Error while read/writing ia segment. Starting entry = 1. Specified length = 566805. Expected length = 174. *** INTERNAL PROGRAMMING ERROR *** in file "fiospa_new.F", at location # 1425. ioerr(1) = 4 ioerr(2) = 1 **** ABORTING RUN DUE TO AN INTERNAL ERROR **** I'll attach 2 models, one with 25mm element size, where the analysis it's alright, and another with 15mm element size, where I get the error buckling_15mm.hm buckling_25mm.hm
  3. Pedro Neves

    ERROR #1479 in the input data

    Problem solved! I only found out know that the property must be PBEAM, and not PBEAML because of my cross section, that is not standard
  4. Pedro Neves

    ERROR #1479 in the input data

    Hi, I'm trying to make a buckling analysis of a CBEAM element for a project and I'm having some problems when I try to run the analaysis in Optistruct. I keep getting the message *** See next message about line 129 from file: D:/asus/Desktop/MEst/HM/buckling.fem "PBEAML 1 1 +" *** ERROR # 1479 *** in the input data: Incorrectly formatted numeric data in field 9. (If it is a character field, it should start with a letter.) I looked into everything in my model and all seems fine I don't get where the error comes from. Please help, the model is attached buckling.hm
  5. @Prakash Pagadala have you already looked into my model?
  6. @Ivan cool, I didn't know about this feature, I'll try to understand how it's used and put it on my model. Thanks!
  7. Ok, but even if I model them, I'll have to make a connection with rigids, because they're an independent component of the monocoque, right? Or there's another way that I can simulate the way that the supports are conected to the monocoque?
  8. @Prakash Pagadala yes there is displacement in the dependent nodes. Ok, I'll try to send you 2 files, one with one model of my initial model and another with the result of the final optimization
  9. Hi, I need your opinion and experience to solve a problem. I’m making a composite optimization on a monocoque, and I’m having some problems modeling the suspension. We have some supports that make the connection between the A-arms of the suspension and the monocoque (I’ll attach one photo). We have problems because we simulate the support with a RBE2 (independent node on the A-arm, dependent nodes in the monocoque; I’ll attach one print-screen), and this gives infinite stiffness on the laminate, so in the results of the optimizations there are almost zero stresses on the elements that have nodes on the rigid. This affects our optimization a lot, so the area off the supports are one of the most weak points on our stucture (some of them even started to break on our last monocoque). We even thought about using RBE3, because it doesn’t give additional stiffness, but the way that it works seems to not make sense in our case. What do you suggest to do in order to simulate this in a more proximity to what really happens? Thank you