Point Mass – Which Mass Moments of Inertia?

- May 14, 2019 at 9:24 am
  
  piknockyou
  Subscriber
  
  Hello,
  
  which mass moments of inertia are requested when I add a Point Mass to my static structural analysis?
  
  Is it the mass moments of inertia
  
  1) taken at the center of mass and aligned with the output coordinate system
  
  OR
  
  2) taken at the output coordinate system?
  
  (for reference: https://www.cati.com/blog/2017/03/demystifying-mass-moments-of-inertia-in-solidworks/)
  
  It is certainly not the the principal moments of inertia, because it would need an orientation defined by the principal axes.
  
  Kind regards,
  
  piknockyou
- May 14, 2019 at 3:04 pm
  
  Sandeep Medikonda
  Ansys Employee
  
  It should be mass moment of inertia about the X, Y or Z axis (global co-ordinate system according to the image above) through the model center of mass. Which according to the link sounds like the former option.
  
  The calculations are discussed in this section of the help.
- May 14, 2019 at 3:23 pm
  
  piknockyou
  Subscriber
  
  Thank for confirming my test-calculations. : )