mass
Module
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"pyNastran.bdf.cards.base_card.Element" [URL="../pyNastran.bdf.cards.base_card.html#pyNastran.bdf.cards.base_card.Element",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="defines the Element class"];
"pyNastran.bdf.cards.base_card.BaseCard" -> "pyNastran.bdf.cards.base_card.Element" [arrowsize=0.5,style="setlinewidth(0.5)"];
"pyNastran.bdf.cards.elements.mass.CMASS1" [URL="#pyNastran.bdf.cards.elements.mass.CMASS1",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Defines a scalar mass element."];
"pyNastran.bdf.cards.elements.mass.PointMassElement" -> "pyNastran.bdf.cards.elements.mass.CMASS1" [arrowsize=0.5,style="setlinewidth(0.5)"];
"pyNastran.bdf.cards.elements.mass.CMASS2" [URL="#pyNastran.bdf.cards.elements.mass.CMASS2",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Defines a scalar mass element without reference to a property entry."];
"pyNastran.bdf.cards.elements.mass.PointMassElement" -> "pyNastran.bdf.cards.elements.mass.CMASS2" [arrowsize=0.5,style="setlinewidth(0.5)"];
"pyNastran.bdf.cards.elements.mass.CMASS3" [URL="#pyNastran.bdf.cards.elements.mass.CMASS3",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Defines a scalar mass element that is connected only to scalar points."];
"pyNastran.bdf.cards.elements.mass.PointMassElement" -> "pyNastran.bdf.cards.elements.mass.CMASS3" [arrowsize=0.5,style="setlinewidth(0.5)"];
"pyNastran.bdf.cards.elements.mass.CMASS4" [URL="#pyNastran.bdf.cards.elements.mass.CMASS4",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Defines a scalar mass element that is connected only to scalar points,"];
"pyNastran.bdf.cards.elements.mass.PointMassElement" -> "pyNastran.bdf.cards.elements.mass.CMASS4" [arrowsize=0.5,style="setlinewidth(0.5)"];
"pyNastran.bdf.cards.elements.mass.CONM1" [URL="#pyNastran.bdf.cards.elements.mass.CONM1",fillcolor=white,fontname="Vera Sans, DejaVu Sans, Liberation Sans, Arial, Helvetica, sans",fontsize=10,height=0.25,shape=box,style="setlinewidth(0.5),filled",target="_top",tooltip="Concentrated Mass Element Connection, General Form"];
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"pyNastran.bdf.cards.elements.mass.PointMassElement" -> "pyNastran.bdf.cards.elements.mass.CONM2" [arrowsize=0.5,style="setlinewidth(0.5)"];
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"pyNastran.bdf.cards.base_card.Element" -> "pyNastran.bdf.cards.elements.mass.PointMassElement" [arrowsize=0.5,style="setlinewidth(0.5)"];
}
All mass elements are defined in this file. This includes:
CMASS1
CMASS2
CMASS3
CMASS4
CONM1
CONM2
All mass elements are PointMassElement and Element objects.
- class pyNastran.bdf.cards.elements.mass.CMASS1(eid: int, pid: int, nids: list[int], c1: int = 0, c2: int = 0, comment: str = '')[source]
Bases:
PointMassElement
Defines a scalar mass element.
1
2
3
4
5
6
7
CMASS1
EID
PID
G1
C1
G2
C2
Creates a CMASS1 card
- Parameters:
- eidint
element id
- pidint
property id (PMASS)
- nidslist[int, int]
node ids
- c1 / c2int; default=0
DOF for nid1 / nid2
- commentstr; default=’’
a comment for the card
- Centroid()[source]
Centroid is assumed to be c=(g1+g2)/2. If g2 is blank, then the centroid is the location of g1.
- _properties = ['node_ids']
- classmethod add_card(card, comment='')[source]
Adds a CMASS1 card from
BDF.add_card(...)
- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property node_ids
- safe_cross_reference(model: BDF, xref_errors)[source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- type = 'CMASS1'
- class pyNastran.bdf.cards.elements.mass.CMASS2(eid, mass, nids, c1, c2, comment='')[source]
Bases:
PointMassElement
Defines a scalar mass element without reference to a property entry.
1
2
3
4
5
6
7
CMASS2
EID
M
G1
C1
G2
C2
Creates a CMASS2 card
- Parameters:
- eidint
element id
- massfloat
mass
- nidslist[int, int]
node ids
- c1 / c2int; default=None
DOF for nid1 / nid2
- commentstr; default=’’
a comment for the card
- Centroid()[source]
Centroid is assumed to be c=(g1+g2)/2. If g2 is blank, then the centroid is the location of g1.
- _properties = ['node_ids']
- classmethod add_card(card, comment='')[source]
Adds a CMASS2 card from
BDF.add_card(...)
- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- cp_name_map = {'M': 'mass'}
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property node_ids
- repr_fields()[source]
Gets the fields in their simplified form
- Returns:
- fieldslist[varies]
the fields that define the card
- safe_cross_reference(model: BDF, xref_errors)[source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- type = 'CMASS2'
- class pyNastran.bdf.cards.elements.mass.CMASS3(eid, pid, nids, comment='')[source]
Bases:
PointMassElement
Defines a scalar mass element that is connected only to scalar points.
1
2
3
4
5
CMASS3
EID
PID
S1
S2
Creates a CMASS3 card
- Parameters:
- eidint
element id
- pidint
property id (PMASS)
- nidslist[int, int]
SPOINT ids
- commentstr; default=’’
a comment for the card
- _properties = ['node_ids']
- classmethod add_card(card, comment='')[source]
Adds a CMASS3 card from
BDF.add_card(...)
- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property node_ids
- type = 'CMASS3'
- class pyNastran.bdf.cards.elements.mass.CMASS4(eid, mass, nids, comment='')[source]
Bases:
PointMassElement
Defines a scalar mass element that is connected only to scalar points, without reference to a property entry
1
2
3
4
5
CMASS4
EID
M
S1
S2
Creates a CMASS4 card
- Parameters:
- eidint
element id
- massfloat
SPOINT mass
- nidslist[int, int]
SPOINT ids
- commentstr; default=’’
a comment for the card
- _properties = ['node_ids']
- cp_name_map = {'M': 'mass'}
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property node_ids
- type = 'CMASS4'
- class pyNastran.bdf.cards.elements.mass.CONM1(eid: int, nid: int, mass_matrix: ndarray, cid: int = 0, comment: str = '')[source]
Bases:
PointMassElement
Concentrated Mass Element Connection, General Form Defines a 6 x 6 symmetric mass matrix at a geometric grid point
1
2
3
4
5
6
7
8
9
CONM1
EID
G
CID
M11
M21
M22
M31
M32
M33
M41
M42
M43
M44
M51
M52
M53
M54
M55
M61
M62
M63
M64
M65
M66
Creates a CONM1 card
- Parameters:
- eidint
element id
- nidint
the node to put the mass matrix
- mass_matrix(6, 6) float ndarray
the 6x6 mass matrix, M
- cidint; default=0
the coordinate system for the mass matrix
- commentstr; default=’’
a comment for the card
- ::
- [M] = [M11 M21 M31 M41 M51 M61]
[ M22 M32 M42 M52 M62] [ M33 M43 M53 M63] [ M44 M54 M64] [ Sym M55 M65] [ M66]
- _properties = ['node_ids']
- classmethod add_card(card: BDFCard, comment: str = '')[source]
Adds a CONM2 card from
BDF.add_card(...)
- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property node_ids: list[int]
- repr_fields()[source]
Gets the fields in their simplified form
- Returns:
- fieldslist[varies]
the fields that define the card
- safe_cross_reference(model: BDF, xref_errors)[source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- type = 'CONM1'
- class pyNastran.bdf.cards.elements.mass.CONM2(eid, nid, mass, cid=0, X=None, I=None, comment='')[source]
Bases:
PointMassElement
1
2
3
4
5
6
7
8
CONM2
EID
NID
CID
MASS
X1
X2
X3
I11
I21
I22
I31
I32
I33
CONM2
501274
11064
132.274
Creates a CONM2 card
- Parameters:
- eidint
element id
- nidint
node id
- massfloat
the mass of the CONM2
- cidint; default=0
coordinate frame of the offset (-1=absolute coordinates)
- X(3, ) list[float]; default=None -> [0., 0., 0.]
xyz offset vector relative to nid
- I(6, ) list[float]; default=None -> [0., 0., 0., 0., 0., 0.]
mass moment of inertia matrix about the CG I11, I21, I22, I31, I32, I33 = I
- commentstr; default=’’
a comment for the card
- Centroid()[source]
This method seems way more complicated than it needs to be thanks to all these little caveats that don’t seem to be supported.
- Centroid_no_xref(model: BDF) np.ndarray [source]
This method seems way more complicated than it needs to be thanks to all these little caveats that don’t seem to be supported.
- I
Mass moments of inertia measured at the mass center of gravity in the coordinate system defined by field 4. If CID = -1, the basic coordinate system is implied. (Real) I11, I21, I22, I31, I32, I33 = I
- Inertia()[source]
Returns the 3x3 inertia matrix .. warning:: doesnt handle offsets or coordinate systems
- X
Offset distances from the grid point to the center of gravity of the mass in the coordinate system defined in field 4, unless CID = -1, in which case X1, X2, X3 are the coordinates, not offsets, of the center of gravity of the mass in the basic coordinate system. (Real)
- classmethod add_card(card, comment='')[source]
Adds a CONM2 card from
BDF.add_card(...)
- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- cid
Coordinate system identification number. For CID of -1; see X1, X2, X3 below. (Integer > -1; Default = 0)
- cross_reference(model: BDF) None [source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- eid
Element identification number. (0 < Integer < 100,000,000)
- mass
Mass value. (Real)
- nid
Grid point identification number. (Integer > 0)
- property node_ids
- repr_fields()[source]
Gets the fields in their simplified form
- Returns:
- fieldslist[varies]
the fields that define the card
- safe_cross_reference(model: BDF, xref_errors)[source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- type = 'CONM2'
- class pyNastran.bdf.cards.elements.mass.PointMassElement[source]
Bases:
Element
dummy init
- repr_fields() list[int | float | str | None] [source]
Gets the fields in their simplified form
- Returns:
- fieldslist[varies]
the fields that define the card