damper Module

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All damper properties are defined in this file. This includes:

• PDAMP

• PDAMP5 (not implemented)

• PDAMPT

• PVISC

All damper properties are DamperProperty and Property objects.

class pyNastran.bdf.cards.properties.damper.DamperProperty

Bases: Property

dummy init

cross_reference(model: BDF) → None

uncross_reference() → None

Removes cross-reference links

class pyNastran.bdf.cards.properties.damper.PDAMP(pid, b, comment='')

Bases: DamperProperty

1	2	3	4	5	6	7	8	9
PDAMP	PID1	B1	PID2	B2	PID3	B3	PID4	B4
PDAMP	1	2.0

dummy init

B()

classmethod _init_from_empty()

classmethod add_card(card, icard=0, comment='')

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

Parameters:

cardBDFCard()

a BDFCard object

icardint; default=0

the index of the card that’s being parsed

commentstr; default=’’

a comment for the card

b

Force per unit velocity (Real)

pid

Property ID

pname_fid_map = {'B1': 'b', 3: 'b'}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'PDAMP'

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.properties.damper.PDAMP5(pid, mid, b, comment='')

Bases: DamperProperty

Defines the damping multiplier and references the material properties for damping. CDAMP5 is intended for heat transfer analysis only.

Mid()

returns the material ID of an element

Returns:

midint

the Material ID

classmethod _init_from_empty()

classmethod add_card(card, comment='')

Adds a PDAMP5 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

b

Damping multiplier. (Real > 0.0) B is the mass that multiplies the heat capacity CP on the MAT4 or MAT5 entry.

cross_reference(model: BDF) → None

Cross links the card so referenced cards can be extracted directly

Parameters:

modelBDF()

the BDF object

mid

Material ID

pid

Property ID

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'PDAMP5'

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.properties.damper.PDAMPT(pid, tbid, comment='')

Bases: DamperProperty

dummy init

Tbid()

classmethod _init_from_empty()

classmethod add_card(card, comment='')

Adds a PDAMPT 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

pid

Property ID

pname_fid_map = {}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

tbid

Identification number of a TABLEDi entry that defines the damping force per-unit velocity versus frequency relationship

type = 'PDAMPT'

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.properties.damper.PVISC(pid, ce, cr, comment='')

Bases: DamperProperty

Viscous Damping Element Property Defines properties of a one-dimensional viscous damping element (CVISC entry).

1	2	3	4	5	6	7
PVISC	PID1	CE1	CR1	PID2	CE2	CR2
PVISC	3	6.2	3.94

Creates a PVISC card

Parameters:

pidint

property id for a CVISC

cefloat

Viscous damping values for extension in units of force per unit velocity

crfloat

Viscous damping values for rotation in units of moment per unit velocity.

commentstr; default=’’

a comment for the card

classmethod _init_from_empty()

classmethod add_card(card, icard=0, comment='')

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

Parameters:

cardBDFCard()

a BDFCard object

icardint; default=0

the index of the card that’s being parsed

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

pname_fid_map = {'CE1': 'ce'}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'PVISC'

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