PreSimulation Tool

Overview of the PreSimulation Tool user interface.

LS-DYNA

Option	Description
Unit System	Selecting a unit system will automatically set up the default simulation parameters to the correct unit. In any case, you can still modify these values manually.
Dummy	Dummy components that are selected in contact with the seat will be exported for the pre-simulation. The selection can be done via: Components Mechanism Opens a dialog to select a complete dummy Assemblies Set Opens a dialog to select a set of type *SET_PART_LIST
Seat	Select the seat components that will be exported for the pre-simulation. The selection can be done via: Components Mechanism Opens a dialog to select a mechanism defining the seat. Only the bodies that are defined by components or sets of components will be taken into account. Assemblies Set Opens a dialog to select a set of type *SET_PART_LIST
Fixed Nodes of Seat	Select the nodes that will be fixed during the simulation. The selection can be done via: Nodes Set Opens a dialog to select a set of type *SET_NODE_LIST
Dummy Displacement Direction	Defines the vector in which the dummy components will be moved to the starting simulation position when penetrations with the seat are no longer detected.
Export Files	Defines the pre-simulation deck name and location.
Dummy Velocity	Defines the imposed velocity value applied on the dummy parts during the simulation. Default value = 0.1mm/ms.
Time Step	Defines the control time step value. Default value = 0.001ms.
Scale Materials Density	Scale factor to scale the material density values in order to increase the critical time step of the model. Default value = 10.
Dummy Displacement Step	Displacement increment used to move the selected dummy components along the prescribed vector. After each increment, the penetration check between the dummy and seat will be performed and the dummy motion will be stopped when penetrations are no longer detected. Default value = 10.
Soft	Defines the Soft parameter value in the generated contact between the dummy and seat. Default value = 2.
Friction	Defines the FS parameter value in the generated contact between the dummy and seat. Default value = 0.0.
Imposed Contact Thickness	Defines the value of parameters SST, MST and SLDTHK in the generated contact between the dummy and seat. Default value = 0.0.
Contact Stiffness Scale Factor	Defines the value of parameter SFS in the generated contact between the dummy and seat. Default value = 0.0.
Import *INITIAL_STRESS_SOLID	If this checkbox is activated, initial stresses for solid elements will be imported from the dynain file. This option is activated by default.
Import *INITIAL_STRESS_SHELL	If this checkbox is activated, initial stresses for shell elements will be imported from the dynain file. This option is deactivated by default.
Import *INITIAL_STRESS_BEAM	If this checkbox is activated, initial stresses for beam elements will be imported from the dynain file. This option is deactivated by default.
Export	Starts the export process of the pre-simulation deck at the specified location.
Import dynain File	Allows the LS-DYNA simulation to update the initial model.
Close	Closes the dialog.

To view a tutorial on Pre-Simulation setup, see HM-4650: Seat Deformer with LS-DYNA Pre-Simulation

Radioss

Option	Description
Unit System	Selecting a unit system will automatically set up the default simulation parameters to the correct unit. In any case, you can still modify these values manually.
Dummy	Dummy components that are selected in contact with the seat will be exported for the pre-simulation. The selection can be done via: Components Mechanism Opens a dialog to select a complete dummy. Assemblies Set Opens a dialog to select a set of type /GRPART.
Seat	Select the seat components that will be exported for the pre-simulation. The selection can be done via: Components Mechanism Opens a dialog to select a mechanism defining the seat. Only the bodies that are defined by components or sets of components will be taken into account. Assemblies Set Opens a dialog to select a set of type /GRPART.
Fixed Nodes of Seat	Select the nodes that will be fixed during the simulation. The selection can be done via: Nodes Set Opens a dialog to select a set of type /GRNOD.
Dummy Displacement Direction	Defines the vector in which the dummy components will be moved to the starting simulation position when penetrations with the seat are no longer detected.
Export File	Defines the pre-simulation deck name and location.
Generate XREF for initial stresses	Enables the creation of /XREF cards for the seat components that are compatible with this Radioss feature in terms of material type and element formulation. This checkbox is activated by default.
Dummy Velocity	Defines the imposed velocity value applied on the dummy parts during the simulation. Default value = 0.1mm/ms.
Time Step	Defines the control time step value. Default value = 0.001ms.
Scale Materials Density	Scale factor to scale the material density values in order to increase the critical time step of the model. Default value = 10.
Dummy Displacement Step	Displacement increment used to move the selected dummy components along the prescribed vector. After each increment, the penetration check between the dummy and seat will be performed and the dummy motion will be stopped when penetrations are no longer detected. Default value = 10.
Friction	Defines the friction value in the generated contact between dummy and seat. Default value = 0.0.
Stmin	Defines the minimum contact stiffness in the generated contact between dummy and seat. Default value = 1.0kN/mm.
Gap_Min	Defines the minimum gap in the generated contact between dummy and seat. Default value = 0.5.
IGAP	Defines the IGAP value for the generated contact between dummy and seat. Default value = 2.
Export	Starts the export process of the pre-simulation deck at the specified location.
Import h3d File	Allows the Radioss simulation to update the initial model.
Close	Closes the dialog.