damper Module

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: pyNastran.bdf.cards.base_card.Property

cross_reference(self, model)

uncross_reference(self)

Removes cross-reference links

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

Bases: pyNastran.bdf.cards.properties.damper.DamperProperty

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

B(self)

classmethod _init_from_empty()

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

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

Parameters:

card : BDFCard()

a BDFCard object

icard : int; default=0

the index of the card that’s being parsed

comment : str; default=’‘

a comment for the card

b = None

Force per unit velocity (Real)

pid = None

Property ID

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

raw_fields(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

type = 'PDAMP'

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

class pyNastran.bdf.cards.properties.damper.PDAMP5(pid, mid, b, comment='')

Bases: pyNastran.bdf.cards.properties.damper.DamperProperty

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

Mid(self)

returns the material ID of an element

Returns:

mid : int

the Material ID

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

b = None

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

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

mid = None

Material ID

pid = None

Property ID

raw_fields(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

type = 'PDAMP5'

uncross_reference(self)

Removes cross-reference links

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

class pyNastran.bdf.cards.properties.damper.PDAMPT(pid, tbid, comment='')

Bases: pyNastran.bdf.cards.properties.damper.DamperProperty

Tbid(self)

classmethod _init_from_empty()

classmethod add_card(card, comment='')

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

Parameters:

card : BDFCard()

a BDFCard object

comment : str; default=’‘

a comment for the card

cross_reference(self, model)

Cross links the card so referenced cards can be extracted directly

Parameters:

model : BDF()

the BDF object

pid = None

Property ID

pname_fid_map = {}

raw_fields(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

tbid = None

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

type = 'PDAMPT'

uncross_reference(self)

Removes cross-reference links

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card

class pyNastran.bdf.cards.properties.damper.PVISC(pid, ce, cr, comment='')

Bases: pyNastran.bdf.cards.properties.damper.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:

pid : int

property id for a CVISC

ce : float

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

cr : float

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

comment : str; 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:

card : BDFCard()

a BDFCard object

icard : int; default=0

the index of the card that’s being parsed

comment : str; default=’‘

a comment for the card

cross_reference(self, model)

pname_fid_map = {'CE1': 'ce'}

raw_fields(self)

repr_fields(self)

Gets the fields in their simplified form

Returns:

fields : List[varies]

the fields that define the card

type = 'PVISC'

uncross_reference(self)

Removes cross-reference links

write_card(self, size=8, is_double=False)

Writes the card with the specified width and precision

Parameters:

size : int (default=8)

size of the field; {8, 16}

is_double : bool (default=False)

is this card double precision

Returns:

msg : str

the string representation of the card