Initial Values Reference
You must specify initial values for the 6-DOF body, which are used to define the body at the start of the simulation.
These initial values comprise:
You set the initial values of the 6-DOF body in the child nodes of the Initial Values node. Not all of the listed initial values must be set for each motion type. Depending on the selection of the Body Motion Option of the 6-DOF body, the child nodes adjust dynamically.
You specify all of the initial values of the 6-DOF body with respect to a specified coordinate system.
When simulating flexible DFBI bodies by coupling DFBI and solid stress, the inertial properties of the body on the DFBI side must match the inertial properties of the solid region on the solid stress side. You can automatically populate the Centre of Mass and Moment of Inertia values for the DFBI body with those values of the solid region using the 6-DOF Body Pop-Up Menu option, Import Inertial Properties.
- Child Nodes
-
- Angular Velocity
- Specifies the initial angular velocity of the body, with respect to a specified coordinate system.
- Center of Mass
- Specifies the initial position of the center of mass of the body, with respect to a specified coordinate system.
- Moment of Inertia
- Specify the initial
moments of inertia tensor, with respect to a specified coordinate
system.
For 3D bodies, the available properties are:
- Diagonal Components
- Specifies the diagonal components of the tensor (see Eqn. (4895)).
- Coordinate System
- Specifies the coordinate system with respect to which the components of the moments of inertia tensor are defined. The coordinate system must be Cartesian.
- Off Diagonal Components
- Specifies the off diagonal components of the tensor (see Eqn. (4895)).
- Use Center of Mass
- When activated, the moments of inertia tensor is defined with respect to the initial center of mass of the body. When deactivated, the tensor is defined with respect to the origin of the selected Coordinate System.
For 2D bodies, the available properties are:
- Value
- Specifies the single value of moment of inertia for the 2D body.
- Use Center of Mass
- When activated, the moments of inertia tensor is defined with respect to the initial center of mass of the body. When deactivated, the tensor is defined with respect to initial body position.
- Orientation
- Allows you to specify the coordinate system that defines the initial orientation of the body local coordinate system. The coordinate system must be Cartesian.
- Velocity
- Allows you to specify the initial velocity of the body, with respect to a specified coordinate system.
- Attachment Point
- Allows you to specify the point where the body is initially attached to the planar motion carriage.