bdf_renumber Module

defines:
bdf_renumber(bdf_filename, bdf_filename_out, size=8, is_double=False,
starting_id_dict=None, round_ids=False, cards_to_skip=None, log=None, debug=False)
superelement_renumber(bdf_filename, bdf_filename_out=None, size=8, is_double=False,
starting_id_dict=None, cards_to_skip=None, log=None, debug=False)
pyNastran.bdf.mesh_utils.bdf_renumber._create_mid_map(model, mid)[source]

builds the mid_map

pyNastran.bdf.mesh_utils.bdf_renumber._create_nid_maps(model, starting_id_dict, nid)[source]

builds the nid_maps

pyNastran.bdf.mesh_utils.bdf_renumber._get_bdf_model(bdf_filename, cards_to_skip=None, log=None, debug=False)[source]

helper method

pyNastran.bdf.mesh_utils.bdf_renumber._update_case_control(model, mapper)[source]

Updates the case control deck; helper method for bdf_renumber.

Parameters:
model : BDF()

the BDF object

mapper : dict[str] = List[int]

Defines the possible case control header values for each entry (e.g. LOAD)
pyNastran.bdf.mesh_utils.bdf_renumber._update_case_key(key, elemental_quantities, seti2, eid_map, nid_map)[source]

Updates a Case Control SET card. A set may have an elemental result or a nodal result.

pyNastran.bdf.mesh_utils.bdf_renumber._update_coords(model, starting_id_dict, cid, cid_map)[source]

updates the coords

pyNastran.bdf.mesh_utils.bdf_renumber._update_elements(model, starting_id_dict, eid, eid_map, mass_id_map, rigid_elements_map)[source]

updates the elements

pyNastran.bdf.mesh_utils.bdf_renumber._update_materials(unused_model, starting_id_dict, mid, mid_map, all_materials)[source]
pyNastran.bdf.mesh_utils.bdf_renumber._update_mpcs(model, starting_id_dict, mpc_id, mpc_map)[source]

updates the mpcs

pyNastran.bdf.mesh_utils.bdf_renumber._update_nodes(model, starting_id_dict, nid, nid_map)[source]

updates the nodes

pyNastran.bdf.mesh_utils.bdf_renumber._update_properties(model, starting_id_dict, pid, properties_map, properties_mass_map)[source]

updates the properties

pyNastran.bdf.mesh_utils.bdf_renumber._update_spcs(model, starting_id_dict, spc_id, spc_map)[source]

updates the spcs

pyNastran.bdf.mesh_utils.bdf_renumber._write_bdf(model, bdf_filename_out, size=8, is_double=False)[source]

helper method

pyNastran.bdf.mesh_utils.bdf_renumber.bdf_renumber(bdf_filename, bdf_filename_out, size=8, is_double=False, starting_id_dict=None, round_ids=False, cards_to_skip=None, log=None, debug=False)[source]

Renumbers a BDF

Parameters:
bdf_filename : str / BDF

str : a bdf_filename (string; supported) BDF : a BDF model that has been cross referenced and is fully valid (an equivalenced deck is not valid)

bdf_filename_out : str / None

str : a bdf_filename to write None : don’t write the BDF

size : int; {8, 16}; default=8

the bdf write precision

is_double : bool; default=False

the field precision to write

starting_id_dict : dict, None (default=None)

None : renumber everything starting from 1 dict : {key : starting_id}

key : str

the key (e.g. eid, nid, cid, …)

starting_id : int, None

int : the value to start from None : don’t renumber this key

round_ids : bool; default=False

Should a rounding up be applied for each variable? This makes it easier to read a deck and verify that it’s been renumbered properly. This only really applies when starting_id_dict is None

cards_to_skip : List[str]; (default=None -> don’t skip any cards)

There are edge cases (e.g. FLUTTER analysis) where things can break due to uncross-referenced cards. You need to disable entire classes of cards in that case (e.g. all aero cards).
Returns:
model : BDF()

a renumbered BDF object corresponding to bdf_filename_out

mapper : Dict[bdf_attribute]

List of mapper dictionaries of original ids to merged bdf_attribute : str

a BDF attribute (e.g., ‘nodes’, ‘elements’)

old_id_to_new_id_dict : dict[id_old] : id_new

a sub dictionary that is used to map the node/element/etc. ids

mapper = {

‘elements’ : eid_map, ‘nodes’ : nid_map, ‘coords’ : cid_map, …

}

Todo

bdf_model option for bdf_filename hasn’t been tested ..

Todo

add support for subsets (e.g. renumber only a subset of nodes/elements) ..

Todo

doesn’t support partial renumbering ..

Todo

doesn’t support element material coordinate systems ..

..warning :: spoints might be problematic…check
..warning :: still in development, but it usually brutally crashes

if it’s not supported

..warning :: be careful of card unsupported cards (e.g. ones not read in)
Supports

  • GRIDs - no superelements

  • COORDx

  • elements
    • CELASx/CONROD/CBAR/CBEAM/CQUAD4/CTRIA3/CTETRA/CPENTA/CHEXA
    • RBAR/RBAR1/RBE1/RBE2/RBE3/RSPLINE/RSSCON
  • properties
    • PSHELL/PCOMP/PCOMPG/PSOLID/PSHEAR/PBAR/PBARL PROD/PTUBE/PBEAM
  • mass
    • CMASSx/CONMx/PMASS

  • aero - FLFACT - SPLINEx - FLUTTER

  • partial case control - METHOD/CMETHOD/FREQENCY - LOAD/DLOAD/LSEQ/LOADSET…LOADSET/LSEQ is iffy - SET cards

    • nodes
    • elements
    • SPC/MPC/FLUTTER/FLFACT
  • constraints
    • SPC/SPCADD/SPCAX/SPCD
    • MPC/MPCADD
    • SUPORT/SUPORT1
  • solution control/methods
    • TSTEP/TSTEPNL
    • NLPARM
    • EIGB/EIGC/EIGRL/EIGR
  • sets
    • USET
  • other
    • tables
    • materials
    • loads/dloads
Not Done
  • SPOINT
  • any cards with SPOINTs - DMIG/DMI/DMIJ/DMIJI/DMIK/etc. - CELASx - CDAMPx
  • superelements
  • aero cards - CAEROx - PAEROx
  • thermal cards?
  • optimization cards
  • SETx
  • PARAM,GRDPNT,x; where x>0
  • GRID SEID
  • case control - STATSUB - SUBCASE - global SET cards won’t be renumbered properly

Examples

Renumber Everything; Start from 1

>>> bdf_renumber(bdf_filename, bdf_filename_out, size=8, is_double=False,
                 round_ids=False)

Renumber Everything; Start Material IDs from 100

>>> starting_id_dict = {
    'mid' : 100,
}
>>> bdf_renumber(bdf_filename, bdf_filename_out, size=8, is_double=False,
                 starting_ids_dict=starting_ids_dict, round_ids=False)

Only Renumber Material IDs

>>> starting_id_dict = {
    'cid' : None,
    'nid' : None,
    'eid' : None,
    'pid' : None,
    'mid' : 1,
    'spc_id' : None,
    'mpc_id' : None,
    'load_id' : None,
    'dload_id' : None,
‘method_id’ : None, ‘cmethod_id’ : None, ‘spline_id’ : None, ‘table_id’ : None, ‘flfact_id’ : None, ‘flutter_id’ : None, ‘freq_id’ : None, ‘tstep_id’ : None, ‘tstepnl_id’ : None, ‘suport_id’ : None, ‘suport1_id’ : None, ‘tf_id’ : None, ‘set_id’ : None,

} >>> bdf_renumber(bdf_filename, bdf_filename_out, size=8, is_double=False,

starting_ids_dict=starting_ids_dict, round_ids=False)
pyNastran.bdf.mesh_utils.bdf_renumber.get_renumber_starting_ids_from_model(model)[source]

Get the starting ids dictionary used for renumbering with ids greater than those in model.

Parameters:
model : BDF

BDF object to get maximum ids from.
Returns:
starting_id_dict : dict {str

Dictionary from id type to starting id.
pyNastran.bdf.mesh_utils.bdf_renumber.get_starting_ids_dict_from_mapper(model, mapper)[source]
pyNastran.bdf.mesh_utils.bdf_renumber.superelement_renumber(bdf_filename, bdf_filename_out=None, size=8, is_double=False, starting_id_dict=None, cards_to_skip=None, log=None, debug=False)[source]

Renumbers a superelement

Parameters:
bdf_filename : str / BDF

str : a bdf_filename (string; supported) BDF : a BDF model that has been cross referenced and is fully valid (an equivalenced deck is not valid)

bdf_filename_out : str / None

str : a bdf_filename to write None : don’t write the BDF

size : int; {8, 16}; default=8

the bdf write precision

is_double : bool; default=False

the field precision to write

starting_id_dict : dict, None (default=None)

None : renumber everything starting from 1 dict : {key : starting_id}

key : str

the key (e.g. eid, nid, cid, …)

starting_id : int, None

int : the value to start from None : don’t renumber this key

cards_to_skip : List[str]; (default=None -> don’t skip any cards)

There are edge cases (e.g. FLUTTER analysis) where things can break due to uncross-referenced cards. You need to disable entire classes of cards in that case (e.g. all aero cards).
Returns:
model : BDF()

a renumbered BDF object corresponding to bdf_filename_out