Create/Modify an External System
External Systems → New…
The dialog box operates in two modes,
■Create mode: To create a new External system in the model. When the dialog is opened from the menu (External Systems → New…) it opens in ‘Create’ mode.
■Modify mode: To modify an existing External System in the model. If an existing external system in the model, is selected for modification (by right clicking the body and choosing the 'Modify' option) then the same dialog opens in 'Modify' mode. In the Modify mode, the fields on the dialog will be pre-populated with the values of the external system being modified.
Note: | By default, the external system is placed so its local body reference frame (LBRF) is at the origin of the global coordinate system. The LBRF corresponds to the origin of the finite element (FE) environment in which the body was originally modeled. You can also set the location and orientation as you import the body or after it is imported as you do any element in Adams View. This is applicable only for external systems that have a visual representation. |
For the option: | Do the following: |
|---|---|
External System Name | Enter the name you want assigned to the external system. |
type | The type of external system. Select one from the following options, 1. Nastran 2. User The default option when the dialog is opened in the Create mode is ‘Nastran’. |
input_file_name | File containing the input source parameters for the external system. The button provided on the side of the field  can be used to view and / or edit the specified file. |
modal_neutral_file_name | An optional (rigid only) MNF, if a visual representation of the external system is required. |
md_db_file_name | An optional MD DB, if a visual representation of the external system is required. |
index_in_database | Index of the body in the specified MD DB. Valid only if the parameter md_db_file_name is specified. |
Note: You may optionally specify a modal neutral file (MNF) or an MD DB file (.MASTER) and Adams View creates the necessary Adams View geometry for displaying the external system. It also creates a mesh on the external system representing the external system nodes. The external system will have a visual representation only if either of MNF/MD DB is specified. | |
user_function | Specifies up to 30 values for Adams Solver to pass to a user-written subroutine. Valid only if the external system type is 'user'. Otherwise the corresponding fields will be disabled for input. |
interface_routines | Specifies an alternative library and subroutine names for the user subroutines EXTSYS_DERIV, EXTSYS_UPDATE, EXTSYS_OUTPUT, EXTSYS_SAMP, EXTSYS_SET_NS, EXTSYS_SET_ND, EXTSYS_SENSUB, EXTSYS_SET_STATIC_HOLD, EXTSYS_SET_SAMPLE_OFFSET, respectively. Valid only if the external system type is 'user'. Otherwise the corresponding fields will be disabled for input. |
Location | Enter x, y, z coordinate defining the flexible body's location in the default coordinate system. |
Orientation | Specify either of these three orientation methods, ■Orientation ■Along Axis Orientation ■In Plane Orientation |
Relative to | You can: ■ Specify the orientation coordinates. ■Leave blank to use the default coordinate system |