Creating several Point Mass for Modal Analysis

- October 12, 2019 at 9:36 am
  
  DIWAS2441
  Subscriber
  
  Hello, guys!
  
  I want to do a modal, then transient analysis on a steel frame. I want to uniformly add mass(just like using MASS21 element) using the point mass option in Workbench16.0 on a beam(line body). But when I use point mass on a line body it concentrates at the center and does not distribute uniformly. I also tried named selection for all the nodes on the beam and tried to use the scoping method as named selection in point mass dialog box while scoping. But it could not be done. Then, I tried direct attachment for a named selection having a single node. It can be done but I don't know if I am doing it correctly or not. Also, what is the difference between direct and remote attachment in point mass option? Is there an easier way?
- October 12, 2019 at 1:57 pm
  
  peteroznewman
  Subscriber
  
  Yes, there is an easier way, change the density of the material of the frame.
  
  Say the mass of the frame in the model is 50 kg, but you want to uniformly distribute an additional 250 kg to have a total mass of 300 kg. In Engineering Data, edit the frame material Density and multiply the current value by 6. Now you will find the mass of the frame is 300 kg.
- October 23, 2019 at 8:37 am
  
  DIWAS2441
  Subscriber
  
  Thanks for the Reply @peteroznewman, I found the same answer in some of your other replies. I will check the results using a simple BEAM189 analysis.
  
  Thanks a lot!!!!
- October 23, 2019 at 8:39 am
  
  DIWAS2441
  Subscriber
  
  Thanks a lot, I also read the same solution for similar problems. But, would there be any other property changes due to the change in mass using such a technique??
- October 23, 2019 at 9:45 am
  
  peteroznewman
  Subscriber
  
  Nothing I can think of.