XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> Steady Aerodynamics
Steady Aerodynamics is used to define a Downwash (Normalwash, a Pressure, or an Aero Structural Force that is associated with a set of values of the vehicle’s control vector. These “parametric” loads (that is, functions of the control setting) will then be elasticized and used to trim the airplane. These loads should represent total distributed load for their associated control positions - not incremental loads due to perturbations in the controller!
Overview
When the user selects Steady Aerodynamics, the first form that displays is Create/Pressure/Q. Shown adjacent to this form are all the different Actions and Objects that can appear as part of the Steady aerodynamics option:
The following is a portion of the initial form that is displayed when you choose the Steady Aerodynamics option from the main MSC FlightLoads Aerodynamics menu.
Steady Aerodynamics
Most of the Steady Aerodynamic forms are shown and annotated in the following pages, grouped by Action as follows:
The following is a list of the forms included in the Steady Aerodynamics section:
• Create/Pressure/Q
• Create/Normalwash/Q
• Create/Force/Q
• Create Subforms
• Create/Any/Control Vector
• Create/Any/Fem Dependent Data
• Delete/Any
• Modify/Pressure/Q
• Modify/Normalwash/Q
• Modify/Force/Q
• Show/Any/Fringe
• Show Subforms
• Show/Any/Fringe/Fringe Attributes
Create/Pressure/Q
Pressure/Q can be defined by setting the Control Vector Data, Load/BC Set Scale Factor, and by specifying a field for the top and bottom pressure or just one for the Delta Pressure. For 3D SuperGroups the user is asked to supply a Nodal Pressure instead.
Create/Normalwash/Q
Normalwash/Q can be defined by setting the Control Vector Data, Load/BC Set Scale Factor, and by specifying a field for the normalwash.
Note: | This Object is not available when the current SuperGroup is of Type 3D. |
Create/Force/Q
Both the structural and the Aero Force/Q are defined by setting the Control Vector Data, the Load/BC Set Scale Factor, and by specifying a field for the Force Vector and one for the Moment Vector.
Create/Any Subforms
Control Vector
This form is used to enter the information on the symmetry, mach, rigid body motions, and the Control Devices.
Note: | This form is valid for the Create version of the Control Vector form and for the Modify version of the Control Vector form. |
FEM Dependent Data
This form is used to define the Nodes/Elements and their values that make up the field that gets used for the pressure, normalwash, force and moments.
Note: | This form changes based on which databox activated the button on the Steady Aerodynamics form. It can be used to enter either scalar or vector data and to select either nodes or elements. |
Delete/Any
This form allows the user to delete existing Pressure/Q, Normalwash/Q, or Force/Q from the database.
Note: | The Object Normalwash/Q is not available when the current SuperGroup is of type 3D. |
Note: | This form is valid for all the objects (Pressure/Q, Normalwash/Q, and Force/Q). |
Modify/Pressure/Q
Users can modify existing Pressure/Q. All data associated with Pressure/Q can be redefined.
Modify/Normalwash/Q
Users can modify existing Normalwash/Q. All data associated with Normalwash/Q can be redefined.
Note: | The Object Normalwash/Q is not available when the current SuperGroup is of type 3D. |
Modify/Force/Q
Users can modify existing Force/Q. All data associated with Force/Q can be redefined.
Show/Any/Fringe
Users can show fringe plots of the existing Pressure/Q or Normalwash/Q.
Note: | The Object Normalwash/Q is not available when the current SuperGroup is of type 3D. |
Note: | This form is valid for the objects (Pressure/Q and Normalwash/Q). |
Show/Any/Fringe /Fringe Attributes
This form allows the users to set the attributes to be used in determining the Fringe plot.
Note: | This form is valid for the objects (Pressure/Q and Normalwash/Q). |
