Relative Modal Contribution

After execting the results post-processing, the next step is to study the risks of the squeak and rattle issues. You can perform the following operations in the Relative Modal Contribution panel.

Figure 1.

1. E-Line Selection
   1. E-Lines - select Elines in the model
   2. Select Pair - select the respective pair, a node on the line or complete line
   3. Select Direction - select the plotting direction for displacement.
      Note: By default z direction will be selected, since the assumption is the relative displacement will occur and captured in z direction.
   4. Display Excitation Load - view the loading strength plotted in a HyperGraph window. This loading strength value is taken from Load Creation.
   5. Load Time History - generate and plot loading time history and relative displacement plots for the selected Eline and the pair.
      Note: Once the time history is loaded in the session, the next step would be to study the relative modal contributions.
2. RMC Calculation -
   1. Max Peak - is enabled only when you are studying modal contributions based on nodes as the selected pair.
      1. Peak - Value & Time - The plot highlights the peaks values in relative displacement using horizontal and vertical dashed lines and also shows labels to highlight the same.
   2. % of Highest Peaks - is enabled only when you are studying modal contributions based on complete ELine as the selected pair.
      1. Enter the percentage value of peaks that you want to study in the % of Highest Peaks field.
      2. Select Top Contributors - select the number of top modes contributing to be plotted and displayed as bar graphs in descending order of effect.