def findStructElemIDs(elefile, structNodeIDs):
import sys
import numpy as n
import fem_mesh
header_comment_skips = fem_mesh.count_header_comment_skips(elefile)
elems = n.loadtxt(elefile,
delimiter=',',
comments='*',
skiprows=header_comment_skips,
dtype=[('id', 'i4'), ('pid', 'i4'), ('n1', 'i4'),
('n2', 'i4'), ('n3', 'i4'), ('n4', 'i4'),
('n5', 'i4'), ('n6', 'i4'), ('n7', 'i4'),
('n8', 'i4')])
structElemIDs = {}
for i in elems:
# I hate this hard-coded syntax, but this works (for now)
j = i.tolist()
insideStruct = any(x in structNodeIDs for x in j[2:10])
if insideStruct:
structElemIDs[i[0]] = True
if structElemIDs.__len__ == 0:
sys.exit('ERROR: no structure elements were found')
return (elems, structElemIDs)
def findStructElemIDs(elefile, structNodeIDs):
"""
Find the elements that contain nodes in structNodeIDs.
"""
import sys
import numpy as n
import fem_mesh
header_comment_skips = fem_mesh.count_header_comment_skips(elefile)
elems = n.loadtxt(elefile,
delimiter=',',
comments='*',
skiprows=header_comment_skips,
dtype=[('id', 'i4'), ('pid', 'i4'), ('n1', 'i4'),
('n2', 'i4'), ('n3', 'i4'), ('n4', 'i4'),
('n5', 'i4'), ('n6', 'i4'), ('n7', 'i4'),
('n8', 'i4')])
structElemIDs = {}
for i in elems:
# I hate this hard-coded syntax, but this works (for now)
j = i.tolist()
insideStruct = any(x in structNodeIDs for x in j[2:10])
if insideStruct:
structElemIDs[i[0]] = True
if len(structElemIDs) == 0:
sys.exit('ERROR: no structure elements were found')
return (elems, structElemIDs)
def load_nodeIDs_coords(nodefile):
"""
load in node IDs and coordinates, excluding '*' keyword lines
"""
import fem_mesh
import numpy as n
header_comment_skips = fem_mesh.count_header_comment_skips(nodefile)
nodeIDcoords = n.loadtxt(nodefile,
delimiter=',',
comments='*',
skiprows=header_comment_skips,
dtype=[('id', 'i4'), ('x', 'f4'), ('y', 'f4'),
('z', 'f4')])
return nodeIDcoords
def load_nodeIDs_coords(nodefile):
"""
load in node IDs and coordinates, excluding '*' keyword lines
"""
import fem_mesh
import numpy as n
header_comment_skips = fem_mesh.count_header_comment_skips(nodefile)
nodeIDcoords = n.loadtxt(nodefile,
delimiter=',',
comments='*',
skiprows=header_comment_skips,
dtype=[('id', 'i4'), ('x', 'f4'), ('y', 'f4'),
('z', 'f4')])
return nodeIDcoords
def findStructNodeIDs(args):
import sys
import numpy as n
import math as m
import fem_mesh
header_comment_skips = fem_mesh.count_header_comment_skips(args.nodefile)
nodeIDcoords = n.loadtxt(args.nodefile,
delimiter=',',
skiprows=header_comment_skips,
comments='*',
dtype=[('id', 'i4'), ('x', 'f4'),
('y', 'f4'), ('z', 'f4')])
structNodeIDs = {}
sopts = args.sopts
if args.sphere:
'''
sopts is assumed to be a 4 element tuple with the following items:
sphere center coordinates (x,y,z)
sphere radius
'''
for i in nodeIDcoords:
nodeRad = n.sqrt(n.power((i[1] - sopts[0]), 2) +
n.power((i[2] - sopts[1]), 2) +
n.power((i[3] - sopts[2]), 2))
if nodeRad < sopts[3]:
structNodeIDs[i[0]] = True
elif args.layer:
'''
sopts is assumed to be a 3 element tuple with the following items:
dimension for normal to layer (x = 1, y = 2, z = 3)
layer bounds (min,max)
'''
for i in nodeIDcoords:
if i[sopts[0]] > sopts[1] and i[sopts[0]] < sopts[2]:
structNodeIDs[i[0]] = True
elif args.ellipsoid:
'''
sopts is assumed to be a 9 element tuple with the following items:
ellipsoid center coordinates (x,y,z)
ellipsoid half-axis lengths (a,b,c)
ellipsoid euler angles (phi,theta,psi) in DEGREES
'''
cph = m.cos(m.radians(sopts[6])) # cos(phi)
sph = m.sin(m.radians(sopts[6])) # sin(phi)
cth = m.cos(m.radians(sopts[7])) # cos(theta)
sth = m.sin(m.radians(sopts[7])) # sin(theta)
cps = m.cos(m.radians(sopts[8])) # cos(psi)
sps = m.sin(m.radians(sopts[8])) # sin(psi)
# rotation matrix
R = n.matrix([[cth * cps, -cph * sps + sph * sth * cps, sph * sps +
cph * sth * cps],
[cth * sps, cph * cps + sph * sth * sps,
-sph * cps + cph * sth * sps],
[-sth, sph * cth, cph * cth]])
# diagonal maxtrix of squared ellipsoid half-axis lengths
A = n.matrix([[n.power(sopts[3], 2), 0, 0],
[0, n.power(sopts[4], 2), 0],
[0, 0, n.power(sopts[5], 2)]])
# A matrix - eigenvalues are a^2,b^2,c^2 (square of half-axis lengths),
# eigenvectors are directions of the orthogonal principal axes
A = R.transpose().dot(A).dot(R)
# locate nodes within ellipsoid
for i in nodeIDcoords:
radVec = n.matrix([[i[1] - sopts[0]],
[i[2] - sopts[1]],
[i[3] - sopts[2]]])
if radVec.transpose().dot(A.I).dot(radVec) <= 1:
structNodeIDs[i[0]] = True
elif args.cube:
'''
sopts is assumed to be a 6 element tuple with the following items:
Location of most-negative corner (x,y,z) Respective cube dimensions
(x,y,z)
'''
for i in nodeIDcoords:
if i[1] >= sopts[0] and \
i[1] <= (sopts[0] + sopts[3]) and \
i[2] >= sopts[1] and \
i[2] <= (sopts[1] + sopts[4]) and \
i[3] >= sopts[2] and \
i[3] <= (sopts[2] + sopts[5]):
structNodeIDs[i[0]] = True
else:
sys.exit('ERROR: The specified structure is not defined')
if len(structNodeIDs) == 0:
sys.exit('ERROR: no structure nodes were found')
return structNodeIDs
def main():
import sys
import numpy as n
from bc import SortNodeIDs, extractPlane
import fem_mesh
fem_mesh.check_version()
opts = read_cli()
loadtype = opts.loadtype
direction = int(opts.direction)
amplitude = float(opts.amplitude)
lcid = int(opts.lcid)
# open the top load file to write
LOADFILE = open(opts.loadfile, 'w')
if loadtype == 'disp' or loadtype == 'vel' or loadtype == 'accel':
LOADFILE.write("*BOUNDARY_PRESCRIBED_MOTION_NODE\n")
elif loadtype == 'force':
LOADFILE.write("*LOAD_NODE_POINT\n")
else:
sys.exit('ERROR: Invalid loadtype specified (can only be disp, '
'force, vel or accel)')
LOADFILE.write("$ Generated using %s with the following "
"options:\n" % sys.argv[0])
LOADFILE.write("$ %s\n" % opts)
# load in all of the node data, excluding '*' lines
header_comment_skips = fem_mesh.count_header_comment_skips(opts.nodefile)
nodeIDcoords = n.loadtxt(opts.nodefile,
delimiter=',',
skiprows=header_comment_skips,
comments='*',
dtype=[('id', 'i4'), ('x', 'f4'),
('y', 'f4'), ('z', 'f4')])
# there are 6 faces in these models; we need to (1) find the top face and
# (2) apply the appropriate loads
[snic, axes] = SortNodeIDs(nodeIDcoords)
# extract spatially-sorted node IDs on a the top z plane
plane = (2, axes[2].max())
planeNodeIDs = extractPlane(snic, axes, plane)
# write out nodes on the top z plane with corresponding load values
# (direction of motion, nodal displacement (accel, vel, etc), temporal load
# curve ID, scale factor for load curve)
# TODO: would like to clean this up with a dictionary to associate the
# prescribed motions with their integer IDs with one statement instead of
# three conditional statements below
if loadtype == 'disp':
writeNodeLoads(LOADFILE, planeNodeIDs, '%i,2,%i,%f' %
(direction, lcid, amplitude))
elif loadtype == 'vel':
writeNodeLoads(LOADFILE, planeNodeIDs, '%i,0,%i,%f' %
(direction, lcid, amplitude))
elif loadtype == 'accel':
writeNodeLoads(LOADFILE, planeNodeIDs, '%i,1,%i,%f' %
(direction, lcid, amplitude))
elif loadtype == 'force':
writeNodeLoads(LOADFILE, planeNodeIDs, '%i,%i,%f' %
(direction, lcid, amplitude))
LOADFILE.write("*END\n")
# close all of our files open for read/write
LOADFILE.close()
def findStructNodeIDs(nodefile, struct_type, sopts):
"""
Find node IDs that fall within a specified geometry (sphere, layer, cube,
ellipsoid).
INPUTS: nodefile (nodes.dyn)
struct_type (sphere, layer, ellipsoid, cube)
sopts (struct-specific parameters)
OUTPUTS: structNodeIDs (dict)
"""
import sys
import numpy as n
import math as m
import fem_mesh
header_comment_skips = fem_mesh.count_header_comment_skips(nodefile)
nodeIDcoords = n.loadtxt(nodefile,
delimiter=',',
skiprows=header_comment_skips,
comments='*',
dtype=[('id', 'i4'), ('x', 'f4'),
('y', 'f4'), ('z', 'f4')])
structNodeIDs = {}
if struct_type is 'sphere':
'''
sopts is assumed to be a 4 element tuple with the following items:
sphere center coordinates (x,y,z)
sphere radius
'''
for i in nodeIDcoords:
nodeRad = n.sqrt(n.power((i[1] - sopts[0]), 2) +
n.power((i[2] - sopts[1]), 2) +
n.power((i[3] - sopts[2]), 2))
if nodeRad < sopts[3]:
structNodeIDs[i[0]] = True
elif struct_type is 'layer':
'''
sopts is assumed to be a 3 element tuple with the following items:
dimension for normal to layer (x = 1, y = 2, z = 3)
layer bounds (min,max)
'''
for i in nodeIDcoords:
if i[sopts[0]] > sopts[1] and i[sopts[0]] < sopts[2]:
structNodeIDs[i[0]] = True
elif struct_type is 'ellipsoid':
'''
sopts is assumed to be a 9 element tuple with the following items:
ellipsoid center coordinates (x,y,z)
ellipsoid half-axis lengths (a,b,c)
ellipsoid euler angles (phi,theta,psi) in DEGREES
'''
cph = m.cos(m.radians(sopts[6])) # cos(phi)
sph = m.sin(m.radians(sopts[6])) # sin(phi)
cth = m.cos(m.radians(sopts[7])) # cos(theta)
sth = m.sin(m.radians(sopts[7])) # sin(theta)
cps = m.cos(m.radians(sopts[8])) # cos(psi)
sps = m.sin(m.radians(sopts[8])) # sin(psi)
# rotation matrix
R = n.matrix([[cth * cps, -cph * sps + sph * sth * cps, sph * sps +
cph * sth * cps],
[cth * sps, cph * cps + sph * sth * sps,
-sph * cps + cph * sth * sps],
[-sth, sph * cth, cph * cth]])
# diagonal maxtrix of squared ellipsoid half-axis lengths
A = n.matrix([[n.power(sopts[3], 2), 0, 0],
[0, n.power(sopts[4], 2), 0],
[0, 0, n.power(sopts[5], 2)]])
# A matrix - eigenvalues are a^2,b^2,c^2 (square of half-axis lengths),
# eigenvectors are directions of the orthogonal principal axes
A = R.transpose().dot(A).dot(R)
# locate nodes within ellipsoid
for i in nodeIDcoords:
radVec = n.matrix([[i[1] - sopts[0]],
[i[2] - sopts[1]],
[i[3] - sopts[2]]])
if radVec.transpose().dot(A.I).dot(radVec) <= 1:
structNodeIDs[i[0]] = True
elif struct_type is 'cube':
'''
sopts is assumed to be a 6 element tuple with the following items:
Location of most-negative corner (x,y,z) Respective cube dimensions
(x,y,z)
'''
for i in nodeIDcoords:
if i[1] >= sopts[0] and \
i[1] <= (sopts[0] + sopts[3]) and \
i[2] >= sopts[1] and \
i[2] <= (sopts[1] + sopts[4]) and \
i[3] >= sopts[2] and \
i[3] <= (sopts[2] + sopts[5]):
structNodeIDs[i[0]] = True
else:
sys.exit('ERROR: The specified structure is not defined')
if len(structNodeIDs) == 0:
sys.exit('ERROR: no structure nodes were found')
return structNodeIDs
