A Python
script for the extraction of Results from Nastran XDB file
Purpose of the script
The script illustrates the reading of extraction of
Nastran results from an XDB files with FeResPost Python extension.
Script
import sys
sys.stdout=open(__file__+".log", 'w')
from FeResPost import *
import sys
sys.path.insert(0, '../UTIL')
import Util
# Creates and initializes the DataBase :
db=NastranDb()
db.Name="tmpDB"
db.readBdf("../../MODEL/MAINS/unit_xyz.bdf")
db.readGroupsFromPatranSession("../../MODEL/PATRAN/groups.ses")
# Reading or generating Results :
xdbFileName="../../MODEL/EXEC_XDB/unit_xyz.xdb"
db.attachXdb(xdbFileName)
infos=db.getAttachmentLcInfos(xdbFileName)
for tab in infos:
sys.stdout.write("%-20s %-25s %-6d %-6d %-15g
%-15g\n"%(tab[0],tab[1],tab[3],tab[4],tab[5],tab[6]))
resNames=db.getAttachmentResNames(xdbFileName)
for resName in resNames:
sys.stdout.write("%-20s\n"%(resName))
lcName="LAUNCH_ONE_MS2_Y"
scName="Statics"
resNames=[]
resNames.append("Shell Forces")
resNames.append("Shell Moments")
resNames.append("Strain Tensor")
resNames.append("Curvature Tensor")
location="ElemCenters"
grp=db.getGroupCopy("pan_MZ")
results=db.getAttachmentResults(xdbFileName,lcName,scName,resNames,location,grp,["NONE"])
for key,res in results.iteritems():
Util.printRes(sys.stdout,key[0]+" ==>
"+key[2],res)
key=tuple([lcName,scName,"Shell Moments"])
shMoments=results[key]
key=tuple([lcName,scName,"Shell Forces"])
shForces=results[key]
key=tuple([lcName,scName,"Strain Tensor"])
shAvrgStrains=results[key]
key=tuple([lcName,scName,"Curvature Tensor"])
shCurvatures=results[key]
Util.printRes(sys.stdout,key[0]+" ==> "+key[2],shMoments)
Explanation
The different steps of the Nastran FEM importation
are:
- The access to FeResPost
compiled library.
- The creation of a NastranDB FEM
database.
- The attachment of the Nastran
XDB result file to the database.
- The extraction of results from
the XDB file on the selected group.
- In the end, the components of
bending moment tensor on shell elements of the selected group are printed.
References
More information on this example, and the manual
explaining the functions used in this example are given in FeResPost
Reference Manual.
