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AdamEz

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Everything posted by AdamEz

  1. Hi Soraya, I know this dates from quite a while, but is there any chance you've found a solution to your problem ? I am facing the exact same issue with Optistruct at the moment as I am trying to have a Stress-based aggregation function as my optimization response, but all of my efforts with DRESP2 have been fruitless so far. I am trying to code an external function using DRESP3 at the moment but I am not really sure how to do that, given that my input response is the static stress > Von Mises one (which is a vector of the stress for each of the 100+ elements in the element set my response is defined on). I would really appreciate it if you could tell me of any workaround you've used to solve your problem. Thanks in advance
  2. AdamEz

    DRESP3

    Hi Erica, I know this dates from quite a while, but is there any chance you've found a solution to your problem ? I am facing the exact same issue with Optistruct at the moment as I am trying to have a Stress-based aggregation function as my optimization response, but all of my efforts with DRESP2 have been fruitless so far. I am trying to code an external function using DRESP3 at the moment but I am not really sure how to do that, given that my input response is the static stress > Von Mises one (which is a vector of the stress for each of the 100+ elements in the element set my response is defined on). I would really appreciate it if you could tell me of any workaround you've used to solve your problem. Thanks in advance
  3. Hello everyone, For the purposes of a shape optimization I need to conduct for my Master's thesis, I wanted to optimize a response that is partially based on a sum of the Von Mises stress values of several elements (100+) in a certain element set of my model mesh. My initial idea was to do it using a DRESP2 card, set the function as sum, and give as a response input my static stress > Von Mises response; I then realised that the sum function actually sums the response values of multiple separate responses, and not the individual values of multi-output Optistruct responses such as stress or displacement. Is there any feasible workaround for this, other than maybe writing a DRESP3 external function that would take all Von Mises stress values of elements within a certain element set, and churn out the sum of them all or any other scalar value I would need? Defining a stress response for every single element in my set would not be a feasible solution because of the very high number of elements I have in the set of interest. Thank you and appreciate any insight from you on the matter
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