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FieldEng12-Amethyst
12-Amethyst
April 1, 2024
Solved

How to add mass to a point

  • April 1, 2024
  • 2 replies
  • 4102 views

I have a 3D frame model and I want to add mass to a point to locate the CG of a component.  The Help section says to use the Refine Model --> Mass function to do this, but I haven't been able to locate that function on the Ribbon, or in any of the Toolbars.  Where is this located?

 

https://support.ptc.com/help/creo/creo_pma/r10.0/usascii/index.html#page/simulate/simulate/add_mass_pt.html

2 replies

T
Tdaugherty16-Pearl
16-Pearl
April 1, 2024

The article you linked is referencing the Simulate application. This is used for FEA. 

 

Tdaugherty_0-1711976397213.png

 

Tdaugherty_1-1711976408400.png

 

Tdaugherty_2-1711976419591.png

 

    F
    FieldEng12-AmethystAuthor
    12-Amethyst
    April 1, 2024

    Bummer.  Unfortunately, I don't have Simulate.  I didn't realize that's where I was copying the link from.  Thanks for the quick reply.

    tbraxton
    22-Sapphire II
    tbraxton22-Sapphire IIAnswer
    22-Sapphire II
    April 1, 2024

    I think this is relevant to what you are asking about.

     

    Article - CS60265 - How to assign user defined mass properties for a model, part or assembly, in Creo Parametric (ptc.com)

      F
      FieldEng12-AmethystAuthor
      12-Amethyst
      April 1, 2024

      This pointed me in the right direction.  Thanks.  I was trying to assign mass to a datum point, but apparently I can't do that.  I tried to create just a point in a sketch and assign mass to that.  I can't finish the sketch, because it's just a point.  So I created a sphere and assigned the mass to that.  Then I'll locate the masses in the assembly to give the total package the necessary weight distribution.

       

      Thanks for the help.

      F
      FieldEng12-AmethystAuthor
      12-Amethyst
      April 11, 2024

      Sorry for the long delay in replying.  I went back to this topic this morning to see if I could implement what you were talking about.  I'm not sure that I follow.  I'm looking at the mass properties for one of my components.  I just created a sphere to represent the object in my assembly model, and I tried to assign a mass of 13,300 lbm to the object.  But, The inertia values aren't correct.  I made a solid block roughly the size of the engine, and the calculated mass using steel is within 300 lbs of the actual weight.  The inertias look much more realistic.  I can't figure out why I can't input the mass at a CG and come up with an equivalent inertia.

       

      Mass sphere

      FieldEng_0-1712829089249.png

       

      Block mass

      FieldEng_1-1712831543657.png

       

      Thanks in advance.

       

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