RM Analyzer Help

Properties > Aero Classes > Flutter Derivatives

View and modify general Aero Class properties and associated flutter coefficients. Aero Classes can be attached to elements (>Structure>Elements>Cross Sections)  for automated calculation of wind forces.

SettingDescription
Aero Class Table Display general information about the available Aero Classes.
SettingDescription
Group, Aero Group and name of Aero Class
RefCS: Cross section related to the Aero Class for calculation with CFD module
Data, Sym Type of data and flag indicating if coefficients for - directions can be deduced from those of + directions
  • Single Values: Only one coefficient and derivate is given per main direction
  • Table: Several values can be given for each main direction
FactorX, FactorY, FactorZ Additional factors for steady state coefficients
DragX, FIDx Drag coefficient for longitudinal wind and normalization length
Buttons
SettingDescription
Insert before, modify, insert after, copy Edit Aero Class parameters. See also Aero Classes > New/Modify/Copy
Info "i" Start individual CFD calculation for selected Aero class. See also Aero Classes > Individual calculation
Delete Delete selected Aero Class
Flutter Coefficient Table - Angles and Values

Display and modify flutter coefficients of selected Aero Class. The left table shows the available directions and the right table the coefficients for the selected direction.

SettingDescription
Direction, Angle Main direction and angle of table entry
Recalc Indicates if the line will be recalculated when calling the next Action>Aero
Note: The recalculation state can be changed by pressing the <C> key
Frequency Reduced velocity U/fB of table entry with according normalization length B
Amplitude Amplitude of forced oscillation for CFD calculation

Default: 0 for automatic selection

P1-4, H1-4, A1-4 Dimensionless flutter coefficients for sway, heave and twist
Buttons
SettingDescription
Insert before, modify, insert after, copy Edit flutter coefficients. See also Aero Classes > Flutter Derivatives > New/Modify
Info "i" Show graphical presentation of coefficients of current direction. See also Aero Classes > Flutter Derivatives > Graphical presentation
Delete Delete selected line
Scale Enter additional scaling factor (for each main direction)
Drag, Lift, Moment Select which coefficient is displayed in the table