mass Module

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

• NSM

• PMASS

All mass properties are PointProperty and Property objects.

class pyNastran.bdf.cards.properties.mass.NSM(sid, nsm_type, pid_eid, value, comment='')

Bases: NSMx

Defines a set of non structural mass.

1	2	3	4	5	6	7	8	9
NSM	SID	TYPE	ID	VALUE	ID	VALUE	ID	VALUE

See NSMx

classmethod _init_from_empty()

_properties = ['ids']

type = 'NSM'

class pyNastran.bdf.cards.properties.mass.NSM1(sid, nsm_type, value, pid_eid, comment='')

Bases: NSM1x

Defines a set of non structural mass.

1	2	3	4	5	6	7	8	9
NSM1	SID	TYPE	VALUE	ID	ID	ID	ID	ID
	ID	ID	ID	etc

See NSM1x

classmethod _init_from_empty()

type = 'NSM1'

class pyNastran.bdf.cards.properties.mass.NSM1x(sid, nsm_type, value, ids, comment='')

Bases: Property

Common class for NSM1 and NSML1

Creates an NSM1/NSML1 card

Parameters:

sidint

Case control NSM id

nsm_typestr

Type of card the NSM is applied to valid_properties = {

PSHELL, PCOMP, PBAR, PBARL, PBEAM, PBEAML, PBCOMP, PROD, CONROD, PBEND, PSHEAR, PTUBE, PCONEAX, PRAC2D, ELEMENT

}

valuefloat

NSM1: the non-structural pass per unit length/area NSML1: the total non-structural pass per unit length/area;

the nsm will be broken down based on a weighted area/length

idslist[int]

property ids or element ids depending on nsm_type

commentstr; default=’’

a comment for the card

property Type

gets the nsm_type

classmethod add_card(card, comment='')

Adds an NSM1/NSML1 card from BDF.add_card(...)

Parameters:

cardBDFCard()

a BDFCard object

commentstr; default=’’

a comment for the card

cross_reference(model: BDF) → None

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

valid_properties = ['PSHELL', 'PCOMP', 'PBAR', 'PBARL', 'PBEAM', 'PBEAML', 'PBCOMP', 'PROD', 'CONROD', 'PBEND', 'PSHEAR', 'PTUBE', 'PCONEAX', 'PRAC2D', 'ELEMENT']

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.mass.NSMADD(sid, sets, comment='')

Bases: BaseCard

Defines non structural mass as the sum of the sets listed.

1	2	3	4
NSMADD	2	1	3

Creates an NSMADD card, which sum NSM sets

Parameters:

sidint

the NSM Case Control value

setslist[int]

the NSM, NSM1, NSML, NSML1 values

commentstr; default=’’

a comment for the card

classmethod _init_from_empty()

_properties = ['nsm_ids']

classmethod add_card(card, comment='')

Adds an NSMADD 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

property nsm_ids

gets the nonstructural-mass ids

raw_fields()

safe_cross_reference(model: BDF, debug=True)

type = 'NSMADD'

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

write_card_16(is_double=False)

class pyNastran.bdf.cards.properties.mass.NSML(sid, nsm_type, pid_eid, value, comment='')

Bases: NSMx

Defines a set of lumped non structural mass.

1	2	3	4	5	6	7	8	9
NSML	SID	TYPE	ID	VALUE	ID	VALUE	ID	VALUE

Creates an NSML card, which defines lumped non-structural mass

Parameters:

sidint

Case control NSM id

nsm_typestr

Type of card the NSM is applied to valid_properties = {

PSHELL, PCOMP, PBAR, PBARL, PBEAM, PBEAML, PBCOMP, PROD, CONROD, PBEND, PSHEAR, PTUBE, PCONEAX, PRAC2D, ELEMENT

}

pid_eidint

property id or element id depending on nsm_type

valuefloat

the non-structural pass per unit length/area

commentstr; default=’’

a comment for the card

classmethod _init_from_empty()

_properties = ['ids']

type = 'NSML'

class pyNastran.bdf.cards.properties.mass.NSML1(sid, nsm_type, value, ids, comment='')

Bases: NSM1x

Defines lumped non structural mass entries by VALUE,ID list.

1	2	3	4	5	6	7	8	9
NSML1	SID	TYPE	VALUE	ID	ID	ID	ID	ID
	ID	ID	ID	etc
NSML1	3	ELEMENT	.044	1240	1500
NSML1	SID	TYPE	VALUE	ID	THRU	ID	ID	THRU
	ID	ID	THRU	ID	ID	THRU	ID	ID
	THRU	ID	…
NSML1	15	PSHELL	.067	1240	THRU	1760
	2567	THRU	2568	35689	THRU	40998
	76	THRU	300
NSML1	SID	TYPE	VALUE	ID	THRU	ID	BY	N
	ID	THRU	ID	BY	N
NSML1	3	PSHELL	.067	1240	THRU	1760	1763	1764
	2567	THRU	2568	35689	TO	40999	BY	2
	76666	76668	79834

Creates an NSML card, which defines lumped non-structural mass

Parameters:

sidint

Case control NSM id

nsm_typestr

Type of card the NSM is applied to valid_properties = {

PSHELL, PCOMP, PBAR, PBARL, PBEAM, PBEAML, PBCOMP, PROD, CONROD, PBEND, PSHEAR, PTUBE, PCONEAX, PRAC2D, ELEMENT

}

valuefloat

the non-structural pass per unit length/area

idslist[int]

property ids or element ids depending on nsm_type

commentstr; default=’’

a comment for the card

classmethod _init_from_empty()

type = 'NSML1'

class pyNastran.bdf.cards.properties.mass.NSMx(sid, nsm_type, pid_eid, value, comment='')

Bases: Property

Common class for NSM and NSML

Creates an NSM/NSM1 card

Parameters:

sidint

Case control NSM id

nsm_typestr

Type of card the NSM is applied to valid_properties = {

PSHELL, PCOMP, PBAR, PBARL, PBEAM, PBEAML, PBCOMP, PROD, CONROD, PBEND, PSHEAR, PTUBE, PCONEAX, PRAC2D, ELEMENT

}

pid_eidint

property id or element id depending on nsm_type

valuefloat

the non-structural pass per unit length/area

commentstr; default=’’

a comment for the card

property Type

gets the nsm_type

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

Adds an NSM 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

property ids

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

valid_properties = ['PSHELL', 'PCOMP', 'PBAR', 'PBARL', 'PBEAM', 'PBEAML', 'PBCOMP', 'PROD', 'CONROD', 'PBEND', 'PSHEAR', 'PTUBE', 'PCONEAX', 'PRAC2D', 'ELEMENT', 'PDUM8']

Set points to either Property entries or Element entries. Properties are:

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.mass.PMASS(pid, mass, comment='')

Bases: Property

Scalar Mass Property Specifies the mass value of a scalar mass element (CMASS1 or CMASS3 entries).

1	2	3	4	5	6	7	8	9
PMASS	PID1	M1	PID2	M2	PID3	M3	PID4	M4
PMASS	7	4.29	6	13.2

Creates an PMASS card, which defines a mass applied to a single DOF

Parameters:

pidint

Property id used by a CMASS1/CMASS3 card

massfloat

the mass to apply

commentstr; default=’’

a comment for the card

Mass()

classmethod _init_from_empty()

_properties = ['node_ids']

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 = {3: 'mass'}

raw_fields()

repr_fields()

Gets the fields in their simplified form

Returns:

fieldslist[varies]

the fields that define the card

type = 'PMASS'

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