9.8.1. Flex Concentrated Loads
Flex Concentrated Loads generates a nodal force or moment based on the reference marker on FFlex bodies.
The Node Set:
Should be defined before creating the Flex Concentrated Loads.
Must belong to a FFlex body.
The nodal force is generated according to one of two types of Flex Concentrated Loads.
The Uniform type is to apply the same nodal force on all nodes of the node set.
The Relative type is to apply the nodal force from the reference node to each node of the node set.
9.8.1.1. Loads Expression
Uniform Type
The defined nodal force or moment is applied on the selected node in the coordinate system of reference marker.
![../_images/image1695.png](../_images/image1695.png)
Figure 9.118 Diagram for Loads
![../_images/image1703.png](../_images/image1703.png)
Figure 9.119 Flex Concentrated Loads dialog box
Node Set: Defines a node set.
Expression [ \(Force\) ]: Defines the expression.
Reference Marker: The force and torque are specified in the coordinate system of the Reference Marker.
Relative Type
The defined nodal force or moment is applied on the selected node in a reference node.
![../_images/image1714.png](../_images/image1714.png)
Figure 9.120 Diagram for Loads
![../_images/image1724.png](../_images/image1724.png)
Figure 9.121 Flex Concentrated Loads dialog box
Node Set: Defines a node set.
Expression: Defines the expression.
Reference Node: The force and torque are specified in the Reference Node.
9.8.1.2. Loads USUB
![../_images/image1734.png](../_images/image1734.png)
Figure 9.122 Nodal Force icon in the Working Plane
![../_images/image1753.png](../_images/image1753.png)
Figure 9.123 Loads USUB dialog box
Node Set: Defines a node set.
Report Nodes: Defines the report nodes. The reaction force for each node can be reported in RPLT as many as the user define. If the check box is unchecked, there is no node data in RPLT.
Base Body Name (Rigid only): The Ground is selected as a default. Only rigid body, Ground, or Mother Body can be supported. If the Nodal Force is defined with an especial rigid body, this option must be used in order to apply a reaction force of the Nodal Force to the selected rigid body.
Name of User Subroutine: Shows the name of a defined user subroutine.
Parameter of User Subroutine: Shows the list of parameters used in user subroutine.
DLL Name of User Subroutine: Shows the name of DLL defined user-written subroutine. To see Nodal Force subroutine, click here.