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ErikClacey14-Alexandrite
14-Alexandrite
February 20, 2022
Solved

Create a representative mass dummy

  • February 20, 2022
  • 1 reply
  • 2008 views

I sometimes create parts that are supposed to simulate the actual part but cost a fraction to produce. Ie the machined part should have the correct mass, center of gravity and ideally same, or similar responses as the purchased component. It will then be used for harsh mechanical testing, instead of potentially destroying an expensive component.

This is a tedious trial and error process but is there a way of having Creo doing at least some of the work for me? Such as if I design a representative shape and I know that it should have a specific mass, I would extrude a hole (or several holes) to match the correct mass. Can I make Creo vary for example the depth of such a hole until the correct mass is met?

Next will be to have Creo change the position of such a hole to meet the correct center of gravity.

    Best answer by tbraxton

    Yes, it is possible to automate this process using Behavioral Modeling Extension (BMX). You can set up a feasibility study to find if the goal is possible from your starting dummy geometry it will typically only take a few seconds to do this for a part model.

    Once this is done you can build an optimization study that could be used to minimize the size, amount of material required to achieve the equivalent mass etc.

     

    BMX has built in function to place datums at the center of mass in an analysis feature. You can then vary the model dims to place the COG to the correct location and could also attempt to match the principle moments of inertia to your reference part if that is useful.

     

    Refer to this article as an introduction to how to get started.

    https://www.ptc.com/en/support/article/CS40552 

    1 reply

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire IIAnswer
    22-Sapphire II
    February 21, 2022

    Yes, it is possible to automate this process using Behavioral Modeling Extension (BMX). You can set up a feasibility study to find if the goal is possible from your starting dummy geometry it will typically only take a few seconds to do this for a part model.

    Once this is done you can build an optimization study that could be used to minimize the size, amount of material required to achieve the equivalent mass etc.

     

    BMX has built in function to place datums at the center of mass in an analysis feature. You can then vary the model dims to place the COG to the correct location and could also attempt to match the principle moments of inertia to your reference part if that is useful.

     

    Refer to this article as an introduction to how to get started.

    https://www.ptc.com/en/support/article/CS40552 

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      ErikClacey14-AlexandriteAuthor
      14-Alexandrite
      February 21, 2022

      Thanks. That sounds like just what I'm looking for. Unfortunatelly we don't have the BMX  module, so I guess I'll look into getting that.

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