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 following operations in the Relative Modal Contribution panel -


Figure 1.
  1. E-Line Selection -
    1. E-Lines - drop down list to select Elines in the model
    2. Select Pair - drop down list to select the respective pair, a node on the line or complete line
    3. Select Direction - drop down list to 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 - check box option to view the loading strength plotted in a HyperGraph window. This loading strength value is taken from Load Creation
    5. Load Time History - to 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 - option 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 - option 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 - option to select the number of top modes contributing to be plotted and displayed as bar graphs in descending order of effect.