After importing a Flexible body as Filename.rfi file, you can change the properties of its body in the following window.
Figure 1 RFLEX tab of Properties of RFlexbody dialog box [Mode]
Figure 2 RFLEX tab of Properties of RFlexbody dialog box [Animation]
Figure 3 RFLEX tab of Properties of RFlexbody dialog box [Damping]
In the RecurDyn/RFlex, the following modal information is displayed.
• Frequency: Frequency of each mode.
• Coord: Initial condition for modal coordinate
• Velocity: Initial condition for modal velocity
• Mode: You can select mode by Mode Range or Frequency Range.
• Mode Range: select mode by its sequence.
• Frequency Range: select mode by its frequency
• Animation: You can see each Mode shape as animation.
• Mode Seq: Sequence of the current mode.
• Frame/cycle: Animation frame and Cycle.
• Frequency: Frequency of the current mode
• Prev: The previous mode
• Play: Play animation of its mode
• Next: The next mode
• Scale Factor: Scale factor of mode shape.
• Show Undeformed: Show mode shape with the undeformed state.
• Damping: You can modify damping values.
Damping Type: Determine calculation type
• Damping ratio:
o Damping coefficient
o Critical damping coefficient
• Damping coefficient: direct value
• Stiffness proportional ratio [%] :
o Damping coefficient
• Default: Set Damping coefficient by Critical damping ratio
• Mode Range: Select mode by its sequence
• Frequency Range: Select mode by its frequency
• Import: import damping coefficients of all modes
o File format (*.fdc)
The total number of modes should be equal.
The first line is comment.
The first column is comment.
The second column should have damping coefficients of all modes.
• Reassociation: If the RecurDyn cannot find a RFI file when you open a model, this function is activated and you can reassociate the RFI file again. Also, this function is inactivated after the RFI file is connected.
Mass Invariant option
• When the Depends on Body Setting is selected in the Flexibility/RFlex tab is selected, then this option can be selectable. The default is Full.
• If the Depends on Body Setting in Flexibility/RFlex tab and Partial option is selected, then the Invariant Variables N4 () and N6 () related in the Mass matrix of a RFlex body are not computed for solving speed improvement.
• If the Depends on Body Setting in Flexibility/RFlex tab and Full option is selected, then the all Invariant Variables are used for computing the Mass matrix.