Analysis Control

  Analysis control is achieved in NASTRAN via the Nastran, File Management, Executive Control, and Case Control cards at the start of the input file. This information is often supplemented by special Bulk Data cards.

The interface produces by default a set of analysis control cards suitable for solution sequence 24 (linear analysis) and post-processing output requests suitable for the NASTRAN to FEMVIEW interface program. These cards are illustrated below:

$ NASTRAN CARDS ... 
$ NONE
$
$ RESULT OUTPUT FILE ... 
$
ASSIGN OUTPUT2=b31box.op2,STATUS=UNKNOWN,UNIT=12
$
$ MODEL TITLE ... 
$
ID FEMGEN MODEL: b31box TITLE: No model title      
$
$ EXECUTIVE CONTROL CARDS ... 
$
SOL 24
TIME 60
COMPILE SOL24 SOUIN=MSCSOU NOREF NOLIST
ALTER 176
OUTPUT2 CASECC,GPL,BGPDT,ECT,CSTM///V,N,IUNIT=12 $
OUTPUT2 OPG1,OQG1,OUGV1,OES1,OEF1///V,N,IUNIT=12 $
ALTER 189
OUTPUT2 OGPFB1,,,,///V,N,IUNIT=12 $
ALTER 210
OUTPUT2 OSTR1,,,,///V,N,IUNIT=12 $
CEND
$
$ CASE CONTROL CARDS ... 
$
DISP(PLOT) = ALL
STRESS(PLOT) = ALL
SPC          = 1
SUBCASE    1
LOAD 1001
$
$$$$$$$$$$$$$$$$$
$ BULK DATA ... $
$$$$$$$$$$$$$$$$$
$
BEGIN BULK
PARAM,OUNIT2,12
$
$ ADDITIONAL BULK DATA CARDS ... 
$ NONE

It is also possible to replace the default analysis options detailed in the previous section with the users own preferences. This is achieved via load type 'SOL-SEQ' and optionally a result output request directory defined by the resource *.results.request (see section 1.4).

The resource *.results.request should be set to the full path name of the directory containing an ascii file in which the desired analysis control cards are placed. Each file should have the following simple free format:

$NASTRAN
Nastran Statements ...
  .         .
$EXECUTIVE
Executive Control Cards ...
  .         .       .
$CASE                      
Case Control Cards ...
  .         .       .
$BULK 
Additional Bulk Data Cards ...
   .        .    .    .
$END

For example, the following command should be used to access file SOL101 in the results directory:

PROPERTY LOAD SOL-SEQ SOL101 1

The interface program will test for both 'SOL101' and 'sol101' on unix systems, the integer 1 at the end of the command must be included but is not used.

Example Result Output Request File for SOL 101

$ DMAP Alter FOR Nastran to Femview
$ GET SUBDMAP SEDRCVR FROM THE STANDARD LIBRARY
$ 
$NASTRAN
$ NONE
$
$EXECUTIVE
$
TIME 60
SOL 101
COMPILE SEDRCVR,SOUIN=MSCSOU
ALTER 45
OUTPUT2 CASEDR,GPLS,BGPDTS,ECTS,CSTMS//V,N,ITAPE=0/V,N,IUNIT=12 $ 
OUTPUT2 OPG1,OQG1,OUGV1,OES1,OEF1//V,N,ITAPE=0/V,N,IUNIT=12 $ 
TABPT OUGV1,OES1,OEF1// $ 
ALTER 98
OUTPUT2 OEF1X//V,N,ITAPE=0/V,N,IUNIT=12 $ 
$ NASTRAN AVERAGED STRESSES
ALTER 126
OUTPUT2 OGS1//V,N,ITAPE=0/V,N,IUNIT=12 $ 
ALTER 188
OUTPUT2  OES1C,OEFIT//V,N,ITAPE=0/V,N,IUNIT=12 $
$ GRID POINT BALANCE
ALTER 235
TABPT ONRGY1,,// $
OUTPUT2 OGPFB1,ONRGY1,,,//V,N,ITAPE=0/V,N,IUNIT=12 $ 
ENDALTER
$
$CASE                      
$
DISP(PLOT) = ALL
STRESS(PLOT) = ALL
$
$BULK
$NONE
$