bdf_merge Module

defines:

• bdf_merge(bdf_filenames, bdf_filename_out=None, renumber=True, encoding=None, size=8,

  is_double=False, cards_to_skip=None, log=None, skip_case_control_deck=False)

pyNastran.bdf.mesh_utils.bdf_merge.bdf_merge(bdf_filenames: list[str], bdf_filename_out: str | None = None, renumber: bool = True, encoding: str | None = None, size: int = 8, is_double: bool = False, cards_to_skip: list[str] | None = None, skip_case_control_deck: bool = False, log: SimpleLogger | None = None) → tuple[BDF, list[MAPPER]]

Merges multiple BDF into one file

Parameters:

bdf_filenameslist[str]

list of bdf filenames

bdf_filename_outstr / None

the output bdf filename (default=None; None -> no writing)

renumberbool

should the bdf be renumbered (default=True)

encodingstr

the unicode encoding (default=None; system default)

sizeint; {8, 16}; default=8

the bdf write precision

is_doublebool; default=False

the field precision to write

cards_to_skiplist[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).

skip_case_control_deckbool, optional, defaultFalse

If true, don’t consider the case control deck while merging.

Returns:

modelBDF

Merged model.

mappers_alllist[mapper]

mapperdict[bdf_attribute]old_id_to_new_id_dict

List of mapper dictionaries of original ids to merged

bdf_attributestr

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

old_id_to_new_id_dictdict[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, …

}

Supports

nodes: GRID coords: Coord elements: CQUAD4, CTRIA3, CTETRA, CPENTA, CHEXA, CELASx, CBAR, CBEAM

CONM1, CONM2, CMASS

properties: PSHELL, PCOMP, PSOLID, PMASS materials: MAT1, MAT8

Todo

doesn’t support SPOINTs/EPOINTs ..

Warning

still very preliminary ..