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ConvBDFShort.py
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ConvBDFShort.py
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# -*- coding: utf-8 -*-
"""
Created on Tue Sep 10 15:41:18 2013
Description: Script to parse bdf files to
current nastran readable format.
Also acts as converter for short-form (',')
Date: Sept 10th 2013
Author: Gerry Harvey
Update: 1/10/2013: Free vs Short form check
Forces written out to file
"""
# get filename from user - hardcode for now
# Later this will launch a dialog for browsing files
name = "mmap"
ext = ".bdf"
filename = name + ext
# Open new file for re-formatted BDF
fileOUT = open("reformat.bdf", "w")
fileOUT.close()
# Open newfile for nodes and elements
nodeOUT = open("nodes.txt", "w")
nodeOUT.write("geom\n\tskew gcon\n")
tetOUT = open("Tet.txt", "w")
tetOUT.write("tet\n\tbufr 400000\n")
hexOUT = open("Hex.txt", "w")
hexOUT.write("hex\n\tbufr 400000\n")
frcOUT = open("Force.txt", "w")
# No need to close, but may help clashes when switching open mode
nodeOUT.close()
tetOUT.close()
hexOUT.close()
frcOUT.close()
# read current BDF file
fileIN = open (filename, "r")
# Get number of lines in file - not needed
num_lines = sum(1 for line in open(filename))
# Open files needed for output formats
nodeOUT = open("nodes.txt", "a")
fileOUT = open("reformat.bdf", "a")
tetOUT = open("Tet.txt", "a")
hexOUT = open("Hex.txt", "a")
frcOUT = open("Force.txt", "a")
# Set number of characters in columns
n = 8
# Logic for parsing file
while True:
# Update current line
lineNow = fileIN.readline()
# Get X Y Z node locations from GRID
if (lineNow.startswith('GRID')):
# Perform 'free-form' or 'short form' check
if "," in lineNow:
# Create list of strings on line
nodeLoc = lineNow.split(',')
nitems = len(nodeLoc)
else:
nodeLoc = [lineNow[i:i+n] for i in range(0, len(lineNow), n)]
nitems = len(nodeLoc)
i = 1
for i in range(1,nitems):
# Strip Whitespace from strings
nodeLoc[i] = nodeLoc[i].lstrip()
# Justify strings correctly for formatting
nodeLoc[i] = nodeLoc[i].rjust(8)
i = i+1
# extract node number, X, Y and Z loc - real numbers
nodeNum = float(nodeLoc[1]); int(nodeNum)
xLoc = float(nodeLoc[3])
yLoc = float(nodeLoc[4])
zLoc = float(nodeLoc[5])
# Write Out Node List
nodeOUT.write('\t%s %d %f %f %f\n' \
%("gcon",nodeNum, xLoc, yLoc, zLoc) )
#Write Out GRID point in BDF Short Field
label = "GRID" # can replace with nodeLoc[0]
label = label.ljust(8)
fileOUT.write('%.8s%.8s%.8s%.8s%.8s%.8s%.8s\n' \
%(label, nodeLoc[1], nodeLoc[2], nodeLoc[3], nodeLoc[4], nodeLoc[5], nodeLoc[6]))
# Get nodes and materials for Tets
elif (lineNow.startswith('CTETRA')):
# Perform 'free-form' or 'short form' check
if "," in lineNow:
tetElm = lineNow.split(',')
else:
tetElm = [lineNow[i:i+n] for i in range(0, len(lineNow), n)]
# Extract Node number, material and 1st 4 nodes
# Note: can ignore 2nd CTETRA line - midline nodes. Can use '.readlines' in future
tetNum = int(tetElm[1])
matNum = int(tetElm[2])
node1 = int(tetElm[3])
node2 = int(tetElm[4])
node3 = int(tetElm[5])
node4 = int(tetElm[6])
# Write out Element list
tetOUT.write('\t%s %s %d %d %d %d\n' \
%("gcon", "mat1", node1, node2, node3, node4) )
# Write out ELEMENTS in BDF Short Form
label = "CTETRA" # can replace with tetElm[0]
fileOUT.write('%-8s%-8d%-8d%-8d%-8d%-8d%-8d\n' \
%(label, tetNum, matNum, node1, node2, node3, node4))
elif (lineNow.startswith('CHEXA')):
# HEX elements split over 2 lines so read next line and add
lineNxt = fileIN.readline()
# Perform 'free-form' or 'short form' check
if "," in lineNow:
hexElm = lineNow.split(',') + lineNxt.split(',')
else:
hexElm = [lineNow[i:i+n] for i in range(0, len(lineNow), n)] \
+ [lineNxt[i:i+n] for i in range(0, len(lineNxt), n)]
# Extract Node number, material and 1st 8 nodes
hexNum = int(hexElm[1])
matNum = int(hexElm[2])
node1 = int(hexElm[3])
node2 = int(hexElm[4])
node3 = int(hexElm[5])
node4 = int(hexElm[6])
node5 = int(hexElm[7])
node6 = int(hexElm[8])
node7 = int(hexElm[10])
node8 = int(hexElm[11])
# Write out Element list
hexOUT.write('\t%s %s %d %d %d %d %d %d %d %d\n' \
%("gcon", "mat1", node1, node2, node3, node4, node5, node6, node7, node8) )
# Write out ELEMENTS in BDF Short Form
# will have to split two lines to be formatted correctly
label = "CHEXA"
fileOUT.write('%-8s%-8d%-8d%-8d%-8d%-8d%-8d%-8d%-8d\n%-8s%-8d%-8d\n' \
%(label, hexNum, matNum, node1, node2, node3, node4, node5, node6, "", node7, node8))
elif (lineNow.startswith('CPENTA')):
# HEX elements split over 2 lines so read next line and add
lineNxt = fileIN.readline()
# Perform 'free-form' or 'short form' check
if "," in lineNow:
hexElm = lineNow.split(',') + lineNxt.split(',')
else:
hexElm = [lineNow[i:i+n] for i in range(0, len(lineNow), n)] \
+ [lineNxt[i:i+n] for i in range(0, len(lineNxt), n)]
# Extract Node number, material and 1st 8 nodes
hexNum = int(hexElm[1])
matNum = int(hexElm[2])
node1 = int(hexElm[3])
node2 = int(hexElm[4])
node3 = int(hexElm[5])
node4 = int(hexElm[5])
node5 = int(hexElm[6])
node6 = int(hexElm[7])
node7 = int(hexElm[8])
node8 = int(hexElm[8])
"""
will need logic to find out which point is would be shared for the
degenerate HEX element
"""
# Write out Element list
hexOUT.write('\t%s %s %d %d %d %d %d %d %d %d\n' \
%("gcon", "mat1", node1, node2, node3, node4, node5, node6, node7, node8) )
# Write out ELEMENTS in BDF Short Form - split into 2 lines
label = "CHEXA"
fileOUT.write('%-8s%-8d%-8d%-8d%-8d%-8d%-8d%-8d%-8d\n%-8s%-8d%-8d\n' \
%(label, hexNum, matNum, node1, node2, node3, node4, node5, node6, "", node7, node8))
elif(lineNow.startswith('FORCE')):
# Perform 'free-form' or 'short form' check
if "," in lineNow:
Forces = lineNow.split(',')
else:
Forces = [lineNow[i:i+n] for i in range(0, len(lineNow), n)]
# Grab Node number from List and write to 'Forces' file
ForceNode = int(Forces[2])
frcOUT.write("\t%s %d\n" %("gcon", ForceNode))
if not lineNow: break #EOF
# while loops end - Write ENDDATA to reformat.bdf and close all
fileOUT.write("ENDDATA")
fileOUT.close()
fileIN.close()
fileOUT.close()
nodeOUT.close()
tetOUT.close()
hexOUT.close()
frcOUT.close()