random_loads Module

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All static loads are defined in this file. This includes:

• LSEQ

• DAREA

• SLOAD

• RFORCE

• RANDPS

class pyNastran.bdf.cards.loads.random_loads.RANDPS(sid: int, j: int, k: int, x: float = 0.0, y: float = 0.0, tid: int | float = 0, comment: str = '')

Bases: RandomLoad

Power Spectral Density Specification

Defines load set power spectral density factors for use in random analysis having the frequency dependent form:

\[S_{jk}(F) = (X+iY)G(F)\]

Creates a RANDPS card

Parameters:

sidint

random analysis set id defined by RANDOM in the case control deck

jint

Subcase id of the excited load set

kint

Subcase id of the applied load set k > j

x / yfloat; default=0.0

Components of the complex number

tidint; default=0

TABRNDi id that defines G(F)

commentstr; default=’’

a comment for the card

Tid()

classmethod _init_from_empty()

classmethod add_card(card, comment='')

Adds a RANDPS card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

get_loads()

j

Subcase identification number of the excited load set. (Integer > 0)

k

Subcase identification number of the applied load set. (Integer >= 0; K >= J)

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

safe_cross_reference(model: BDF, xref_errors)

sid

Random analysis set identification number. (Integer > 0) Defined by RANDOM in the Case Control Deck.

tid

Identification number of a TABRNDi entry that defines G(F).

type = 'RANDPS'

uncross_reference() → None

Removes cross-reference links

validate()

card checking method that should be overwritten

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

x

Components of the complex number. (Real)

class pyNastran.bdf.cards.loads.random_loads.RANDT1(sid: int, n: int, t0: int, tmax: float, comment: str = '')

Bases: RandomLoad

Creates a RANDT1 card

Parameters:

sidint

random analysis set id defined by RANDOM in the case control deck

nint

???

t0int

???

tmaxfloat

???

commentstr; default=’’

a comment for the card

classmethod _init_from_empty()

classmethod add_card(card, comment='')

Adds a RANDT1 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

get_loads()

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

safe_cross_reference(model: BDF, xref_errors)

sid

Random analysis set identification number. (Integer > 0) Defined by RANDOM in the Case Control Deck.

type = 'RANDT1'

uncross_reference() → None

Removes cross-reference links

write_card(size: int = 8, is_double: bool = False) → str

Writes the card with the specified width and precision

Parameters:

sizeint (default=8)

size of the field; {8, 16}

is_doublebool (default=False)

is this card double precision

Returns:

msgstr

the string representation of the card

class pyNastran.bdf.cards.loads.random_loads.RandomLoad(card, data)

Bases: BaseCard