Optistruct/Compose MultiPhysics Optimization Using DRESP3

Muhammed Cakir
Muhammed Cakir Altair Community Member
edited December 2023 in Community Q&A

Hello,

My name is Muhammed Cakir. I am an optomechanical enginner working on TAI. 

I am trying to solve a multiphysics optimization problem using Optistruct. I need a technical support on the use DRESP3 command. The problem is defined below in more detail. 

Problem Statement: 

Size optimization is to be performed on an optical part by keeping the displacement of the optical surface nodes of the part in a certain limit. A special formulation is used to calculate "the displacement" of the surface nodes by an external matlab code (this is ready). Calculation of "the displacement" requires a complex calculation procedure incorporating the undeformed coordinates and the displacements of the surface nodes.

Optistruct should calculate the nodal displacement of the particular surface at every iteration of the optimization, then these displacement data should be used as DRESP3 to be fed to the Compose for further calculations on Matlab. At the best, at every iteration nodal displacements should be written on an excel file. But pch file is also okay.  

My problem is obtaining the nodal displacement and using this displacement data for making further calculations in Matlab over Compose. 

Please someone help me on this issue. 

Regards.

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Answers

  • Gildas_GUILLY
    Gildas_GUILLY
    Altair Employee
    edited December 2023

    Hello Muhammed,

    If you really need/want to use OptiStruct for the optimization part, have you considered using Compose itself instead of Matlab to calculate your criterion ? As they share the same language that looks like the most simple solution to me, as overwise you will have too much programs calling eachother, plus writing of files, you will loose a lot in terms of performances.
    I am joining an example of optimization using Compose to get displacements from OS and reading the nodes initial position from an external file.

    One alternative, if you are indeed performing a parameterized size optimization, would be to use HyperStudy to perform the optimization.
    This way you can use the tools you need for each physics (OS for structural, Compose or Matlab for optical,etc...) and have more freedom about files formats and exchanges of data.

    Gildas

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