RFlex Page

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.