Adams Advanced Package > Adams MaxFlex > Appendix > Appendix G: Building the Run-Ready NLFE Service Data Deck

Appendix G: Building the Run-Ready NLFE Service Data Deck

Adams View (or Adams Car) builds a run-ready data deck (.dat) for the nonlinear flexible body solution (also known as the "NLFE Service") based on the bulk data file (BDF) specified by the user when originally creating the nonlinear flexible body (see Appendix D: Data Flow Diagram for an illustration). The solution is controlled by Adams. So, file management, executive control and case control sections of the run-ready data deck are mostly defined by Adams View while the bulk data section is from the user specified BDF is used with some modification (some statements are added, some are commented out).
Additionally, after exporting the Adams Solver dataset (.adm file) from Adams View one can manually edit the nonlinear flexible body's run-ready data deck generated by Adams View (.dat). After doing so, one could then run the analysis via standalone Adams Solver or open Adams View and use the manually-edited run-ready data deck (.dat) as the basis for a new nonlinear flexible body and those manual edits will be recognized and persisted by Adams View.
The rest of this appendix describes the automatic actions performed by Adams View (or Adams Car) in building the run-ready NLFE Service data deck:
■File management, executive control sections
♦All are defined by the Adams interface (Adams View or Adams Car)
■Case control section
♦MPC, MPCF and/or BCONTACT are read from the user specified BDF.
♦All the other statements are defined by the Adams interface based on the settings in the nonlinear flexible body modify dialog, for example, LOAD selection, stress/strain output flag and so on. For more details see Modifying Nonlinear Flexible Bodies in Adams View.
■Bulk data section
♦Most of the statements from the user specified BDF are copied, though some modifications are made and described in the table below.
 
Statements commented out and replaced by Adams-defined values:
PARAM, WTMASS
Any
Value computed by DTI, UNITS setting
PARAM, POST
1
For SimXpert post-processing
PARAM, LGDISP
1
Consider full nonlinearity
PARAM, GRDPNT
0
For global mass computation
PARAM, PSETID
-2
Special flag for MNF swap
PARAM, CSFLG
1
Activate Adams-NLFE Service solution
PARAM, G
Any
Value set in Adams View
PARAM, W3
Any
Value set in Adams View
PARAM, W4
Any
Value set in Adams View
PARAM, ALPHA1
Any
Value set in Adams View
PARAM, ALPHA2
Any
Value set in Adams View
DTI, UNITS
-
Strings set in Adams View
TSTEPNL
-
All are dummy for avoiding fatal error in Nastran. The values are specifically set by Adams. User should not modify any of the parameters set by Adams in BDF.
Statements added for transient loading:
TLOAD
-
Transient load for gravity if exists
GRAV
-
Gravity vector if exists
TABLED1
-
Table for gravity load if exists
DLOAD
-
Load for combination of all loads
Statements added for MNF swap: (see Appendix A: Theory Description to learn when and why an automated MNF swap is performed)
EIGRL
 
Compute 20 modes
SPOINT
 
20 modes + 6 RESVEC + number of loads
BEGIN BULK FLXBDY = 77
 
For MNF swap
ASET1
 
Attachment GRIDs
QSET1
 
Modal degrees of freedom
Statements commented out:
PARAM, AUTOQSET
 
Not supported in the NLFE Service
PARAM, DBALL
 
Avoid to control database
PARAM, DBUP
 
Avoid to control database
PARAM, DBDN
 
Avoid to control database
PARAM, DBRCV
 
Avoid to control database
NLSTEP
 
TSTEPNL is added by Adams
EIG*
 
Not supported in regular nonlinear solution
BND*
 
Not supported in regular nonlinear solution
?SET*
 
Not supported in regular nonlinear solution
SE*
 
Not supported in regular nonlinear solution
OMIT*
 
Not supported in regular nonlinear solution
RELEASE
 
Not supported in regular nonlinear solution
AE*
 
Not supported in regular nonlinear solution
?AER*
 
Not supported in regular nonlinear solution
RLOAD*
 
Not supported in regular nonlinear solution
ACSRCE
 
Not supported in regular nonlinear solution
SPOINT
 
Not supported in regular nonlinear solution
DAMPING
 
Defined by Adams with parameter above
? Any one character
* Any characters
Below is a comparison of the user specified BDF (left side) and run-ready data deck (right side) using the example twist beam model which is included in the installation. The sections before "BEGIN BULK" are defined by Adams based on the setting in Adams View (for example, DLOAD is defined for the gravity load defined in Adams View). ADAMSMNF, RESVEC and METHOD statements are added for the MNF swap. See Appendix A: Theory Description to learn when and why an automated MNF swap is performed.
Before the bulk data section:
 
$! =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
$! Nastran Data Deck Generated By Sim
$! Date 2014-01-23T12:19:54
$! =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
$!
$! NASTRAN Control Section
$! File Management Section
$! Executive Control Section
SOL 400
CEND
ECHO = SORT
$! Case Control Section
SUBCASE 1
$! Subcase name : DefaultLoadCase
$LBCSET SUBCASE1 DefaultLbcSet
SPC = 5
LOAD = 2
DISPLACEMENT(SORT1,PRINT,REAL)=A
STRESS(SORT1,PRINT,REAL,VONMISES
ANALYSIS = NLSTAT
NLSTEP = 1
SOL 400
CEND
ECHO = NONE
NLOPRM OUTCTRL = (SOLUTION,INTERM)
RIGID = LAGRANGE
ADAMSMNF FLEXBODY = YES FLEXONLY = NO EXPORT = DB
RESVEC = COMPONENT
METHOD = 902
SUBCASE 1
ANALYSIS = NLTRAN
TSTEPNL = 1
AUTOSPC(RESIDUAL,NOPRINT) = YES
DLOAD = 1
DISPLACEMENT(PLOT) = ALL
VELOCITY(PLOT) = ALL
ACCELERATION(PLOT) = ALL
In the bulk data section, PARAM, POST and NLSTEP statements are commented out with the message "Next statement is commented out by Adams-NLFE Solver". After the end of user specified BDF statements, Adams defined statements are added and they are indicated between "=== … by Adams-NLFE Solver === START" and "=== … by Adams-NLFE Solver === END".
Bulk data section:
 
BEGIN BULK
$! Bulk Data Pre Section
 
PARAM POST 1
$! Bulk Data Model Section
$! Material Entities of type [ ISOTROPIC
MAT1 1 210000. 0.3 7.8E-6
$! Property Entities of type [ SHELL ]
PSHELL      2    1    3.      1    1
PSHELL      3    1    6.35    1    1
 
… …
 
$SXNAME LOADCOL 3 SPC1 "ASET1
$SXCOLORLOADCOL 3 0
$SXNAME LOADCOL 2 FORCE "ASET
$SXCOLORLOADCOL 2 0
$! Bulk Data Post Section
SPCADD 5 3 4
 
NLSTEP 1
ENDDATA 97a58fd2
BEGIN BULK
$! Bulk Data Pre Section
$ Next statement is commented out by Adams-NLFE Solver
$PARAM POST 1
$! Bulk Data Model Section
$! Material Entities of type [ ISOTROPIC ]
MAT1 1 210000. 0.3 7.8E-6
$! Property Entities of type [ SHELL ]
PSHELL 2 1 3. 1   1   SHELL_2_
PSHELL 3 1 6.35 1   1   SHELL_3_
 
… …
 
$SXNAME LOADCOL 3 SPC1 "ASET1_SPC1"
$SXCOLORLOADCOL 3 0
$SXNAME LOADCOL 2 FORCE "ASET1_FORCE"
$SXCOLORLOADCOL 2 0
$! Bulk Data Post Section
SPCADD 5 3 4
$ Next statement is commented out by Adams-NLFE Solver
$NLSTEP 1
$
$=== Updated or added by Adams-NLFE Solver === START
 
$
$ Unit definition
$
DTI UNITS 1 KG N MM S
$
$ Parameters
$
PARAM* WTMASS 1.000000e-003
PARAM POST 1
PARAM LGDISP 1
PARAM GRDPNT 0
PARAM PSETID -2
PARAM CSFLG 1
$
$ TSTEPNL statement
$
TSTEPNL 1 1000 1.0E-8 1 PFNT -199999999
1.0 0 0 0
0 0
$
$=== Updated or added by Adams-NLFE Solver === END
$
$=== Added by Adams-NLFE Solver === START
$
$ Dynamic load defined in Adams
$
DLOAD* 1 1.000000e+000 1.000000e+000
*
$
$ Gravity load defined in Adams
$
TLOAD1 2 3 1
GRAV* 3 0 1.0 0.000000e+000
* 0.000000e+000 -9.806650e+003
TABLED1 1
0.0 1.0 1.0 1.0 ENDT
 
$
$ EIGRL statement
$
EIGRL 902 20
$
$ SPOINTs for QSET1
$
SPOINT 5911 THRU 5937
$
$ ASET1/QSET1 statements
$
BEGIN BULK FLXBDY = 77
ASET1 123456 5909 5910 5886 5885 5887 588
5890
QSET1 0 5911 THRU 5937
$
$=== Added by Adams-NLFE Solver === END
ENDDATA 97A58FD2