Editing the Mass Properties

When setting up parts, it is important to define their mass properties to facilitate accurate and stable simulations.

In the Vortex® Studio Editor, a part's Mass Properties represents the sum total of each geometry's values for these settings:

  • Mass
  • COM (Center of Mass) Offset
  • Inertia tensor (see Inertia Tensors for technical information about inertia tensor values)

You can set these properties directly in the Properties panel or use the Mass Properties control in the 3D View:

  1. Select the part Explorer panel.

    The Properties panel now displays the part's mass properties in the Parameters tab.

  2. To display the part's inertia in the 3D View, right-click the eye icon in the part's Visibility Toggle column. Make sure that Inertia is checked to see the inertia of the object modeled on screen.

  3. Enter the total Mass for the part. If the Mass Properties control is visible in the 3D View, you can see how changing the mass affects the size of the sphere: the larger the mass the smaller the sphere.

    Warning
    The default value for Mass is 1.000 kg, so you must set the correct value for the part you are creating. If you do not enter the correct value, the default will be used and may not produce the expected results during simulation.
  4. Set the COM Offset for the part. This is an offset to the origin position of the part. You can manually set this property if you know the exact values. However, it is recommended to use the Mass Properties control in the 3D View for setting the COM Offset, especially if you have multiple geometries defined in your part.

  5. Set the Inertia tensor for the selected part. The inertia tensor matrix is represented in the Properties panel as a 3x3 table which you can edit manually if you know the exact values. However, it is recommended to use the Mass Properties control in the 3D View for setting the inertia tensor, especially if you have multiple geometries defined in your part.