DMAP for CMS Analysis (*.out)

 

This is the guide for CMS analysis in MSC/NASTRAN. It is necessary for you to appreciate DMAP command in order to run your input file in MSC/NASTRAN. The steps below inform you how to modify DMAP command. The two example files with this DMAP command are included in the folder, “<Install Dir>\Toolkits\Flexible input files\NASTRAN\NASTRAN_scm.dat”

 

1.  Output File Name

•     Input a name of output file.

 

$============================================$

$=====     COPYRIGHT (C) 2005            ====$

$=====     BY FUNCTION BAY INC.          ====$

$=====     ALL RIGHTS RESERVED           ====$

$============================================$

$

$  DMAP Command for RD/Flex 6.0

$

ASSIGN OUTPUT2='Plate_cms.out' STATUS=UNKNOWN UNIT=20 FORM=UNFORM

 

2.  Executive Control

•     Define solution type.

•     Include ALT file, which makes output file written in the form for RecurDyn.

 

$--------------------------------------------$

$  EXECUTIVE CONTROL  

$--------------------------------------------$

SOL 103

TIME 3000

$

INCLUDE 'RecurDyn_rfi.alt'

 

3.  Case Control

•     Define ‘SUPER’ and ‘SEALL’ for Superelemnet

•     Define GPSTRESS and GPSTRAIN for Stress and Strain Shape

 

$--------------------------------------------$

$  CASE CONTROL       

$--------------------------------------------$

TITLE= CMS analysis for RecurDyn

SUBTITLE= Plate model

$

ECHO = PUNCH

METHOD=2

$

SUPER=1

SEALL=1

GPSTRESS(PUNCH)=ALL

GPSTRAIN(PUNCH)=ALL

SPC = 1  

METHOD = 1

$

VECTOR(SORT1,REAL)=ALL

SPCFORCES(SORT1,REAL)=ALL

STRESS=ALL

STRAIN=ALL

$

OUTPUT(POST)

$ Set 6 : write all element ids for output gpstress and gpstrain (element IDs 1 ~ 50)

SET 6=1 THRU 100

$

$$ Solid element : Use VOLUME instead of SURFACE

$VOLUME 1 SET 6,DIRECT,SYSTEM CORD 0

$

$ Shell type element : Use SURFACE instead of VOLUME

SURFACE 1 SET 6,FIBRE ALL,SYSTEM CORD 0

 

4.  Bulk Data

•     Set Parameters.

•     Specify interior grids except interface nodes.

•     Release some degree of freedoms of interface nodes.

•     Define data needed to perform real eigenvalue analysis with the Lanczos method.

•     Define scalar points.

•    All scalar point identification numbers must be unique with respect to all other structural, scalar points.

•    The number of spoints (Scalar Points) is equal to the sum of normal modes and residual vectors.