constraints Module
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}
All constraint cards are defined in this file. This includes:
Constraint
SUPORT
SUPORT1
SPC
SPC1
SPCAX
MPC
GMSPC
ConstraintADD
SPCADD
MPCADD
The ConstraintObject contain multiple constraints.
- class pyNastran.bdf.cards.constraints.Constraint[source]
Bases:
BaseCard- common class for:
SUPORT / SUPORT1 / SESUP
GMSPC
MPC
SPC / SPC1
SPCAX
SPCOFF / SPCOFF1
- class pyNastran.bdf.cards.constraints.ConstraintAdd[source]
Bases:
Constraintcommon class for SPCADD, MPCADD
- class pyNastran.bdf.cards.constraints.GMSPC(conid, component, entity, entity_id, comment='')[source]
Bases:
Constraint- classmethod add_card(card, comment='')[source]
Adds a GMSPC card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- type = 'GMSPC'
- class pyNastran.bdf.cards.constraints.MPC(conid: int, nodes: list[int], components: list[str], coefficients: list[float], comment: str = '')[source]
Bases:
ConstraintMultipoint Constraint Defines a multipoint constraint equation of the form:
sum(A_j * u_j) = 0
- where:
uj represents degree-of-freedom Cj at grid or scalar point Gj. Aj represents the scale factor
1
2
3
4
5
6
7
8
9
MPC
SID
G1
C1
A1
G2
C2
A2
G3
C3
A3
…
Creates an MPC card
- Parameters:
- conidint
Case Control MPC id
- nodeslist[int]
GRID/SPOINT ids
- componentslist[str]
the degree of freedoms to constrain (e.g., ‘1’, ‘123’)
- coefficientslist[float]
the scaling coefficients
- _properties = ['node_ids']
- classmethod add_card(card: BDFCard, comment='')[source]
Adds an MPC card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- coefficients
Coefficient. (Real; Default = 0.0 except A1 must be nonzero.)
- components
Component number. (Any one of the Integers 1 through 6 for grid points; blank or zero for scalar points.)
- conid
Set identification number. (Integer > 0)
- cross_reference(model: BDF) None[source]
Cross links the card so referenced cards can be extracted directly
- Parameters:
- modelBDF()
the BDF object
- property dependent_dofs: tuple[list[int], list[int]]
The first degree-of-freedom (G1, C1) in the sequence is defined to be the dependent degree-of-freedom. A dependent degree-of-freedom assigned by one MPC entry cannot be assigned dependent by another MPC entry or by a rigid element.
- property dependent_nodes: list[int]
The first degree-of-freedom (G1, C1) in the sequence is defined to be the dependent degree-of-freedom. A dependent degree-of-freedom assigned by one MPC entry cannot be assigned dependent by another MPC entry or by a rigid element.
- property independent_dofs: tuple[list[int], list[int]]
The first degree-of-freedom (G1, C1) in the sequence is defined to be the dependent degree-of-freedom. A dependent degree-of-freedom assigned by one MPC entry cannot be assigned dependent by another MPC entry or by a rigid element.
- property independent_nodes: list[int]
The first degree-of-freedom (G1, C1) in the sequence is defined to be the dependent degree-of-freedom. A dependent degree-of-freedom assigned by one MPC entry cannot be assigned dependent by another MPC entry or by a rigid element.
- property node_ids
- nodes
Identification number of grid or scalar point. (Integer > 0)
- type = 'MPC'
- class pyNastran.bdf.cards.constraints.MPCADD(conid, sets, comment='')[source]
Bases:
ConstraintAddDefines a multipoint constraint equation of the form \(\Sigma_j A_j u_j =0\) where \(u_j\) represents degree-of-freedom \(C_j\) at grid or scalar point \(G_j\).
1
2
3
4
MPCADD
2
1
3
- _properties = ['ids', 'mpc_ids']
- classmethod add_card(card, comment='')[source]
Adds a MPCADD 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 ids
- property mpc_ids
- type = 'MPCADD'
- class pyNastran.bdf.cards.constraints.SESUP(nodes, Cs, comment='')[source]
Bases:
SUPORTCreates a SUPORT card, which defines free-body reaction points. This is always active.
- Parameters:
- nodeslist[int]
the nodes to release
- Cslist[str]
components to support at each node
- commentstr; default=’’
a comment for the card
- type = 'SESUP'
- class pyNastran.bdf.cards.constraints.SPC(conid: int, nodes: list[int], components: list[str], enforced: list[float], comment: str = '')[source]
Bases:
ConstraintDefines enforced displacement/temperature (static analysis) velocity/acceleration (dynamic analysis).
1
2
3
4
5
6
7
8
SPC
SID
G1
C1
D1
G2
C2
D2
SPC
2
32
3
-2.6
5
Creates an SPC card, which defines the degree of freedoms to be constrained
- Parameters:
- conidint
constraint id
- nodeslist[int]
GRID/SPOINT ids
- componentslist[str]
the degree of freedoms to constrain (e.g., ‘1’, ‘123’)
- enforcedlist[float]
the constrained value for the given node (typically 0.0)
- commentstr; default=’’
a comment for the card
- .. note:: len(nodes) == len(components) == len(enforced)
- .. warning:: non-zero enforced deflection requires an SPCD as well
- _properties = ['node_ids', 'constraints', 'gids_ref', 'gids']
- classmethod add_card(card, comment='')[source]
Adds an SPC card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- property constraints
- 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 = 'SPC'
- class pyNastran.bdf.cards.constraints.SPC1(conid: int, components: str, nodes: list[int], comment: str = '')[source]
Bases:
Constraint1
2
3
4
5
6
7
8
9
SPC1
SID
C
G1
G2
G3
G4
G5
G6
G7
G8
G9
etc.
SPC1
3
246
209075
209096
209512
209513
209516
SPC1
3
2
1
3
10
9
6
5
2
8
SPC1
SID
C
G1
THRU
G2
SPC1
313
12456
6
THRU
32
Creates an SPC1 card, which defines the degree of freedoms to be constrained to a value of 0.0
- Parameters:
- conidint
constraint id
- componentsstr
the degree of freedoms to constrain (e.g., ‘1’, ‘123’)
- nodeslist[int]
GRID/SPOINT ids
- commentstr; default=’’
a comment for the card
- _properties = ['node_ids']
- classmethod add_card(card, comment='')[source]
Adds a SPC1 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 = 'SPC1'
- class pyNastran.bdf.cards.constraints.SPCADD(conid, sets, comment='')[source]
Bases:
ConstraintAddDefines a single-point constraint set as a union of single-point constraint sets defined on SPC or SPC1 entries.
1
2
3
4
SPCADD
2
1
3
- _properties = ['ids', 'spc_ids']
- classmethod add_card(card, comment='')[source]
Adds a SPCADD 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 ids
- property spc_ids
- type = 'SPCADD'
- class pyNastran.bdf.cards.constraints.SPCAX(conid, ringax, hid, component, enforced, comment='')[source]
Bases:
ConstraintDefines a set of single-point constraints or enforced displacements for conical shell coordinates.
1
2
3
4
5
6
SPCAX
SID
RID
HID
C
D
SPCAX
2
3
4
13
6.0
Creates an SPCAX card
- Parameters:
- conidint
Identification number of a single-point constraint set.
- ringaxint
Ring identification number. See RINGAX entry.
- hidint
Harmonic identification number. (Integer >= 0)
- componentint
Component identification number. (Any unique combination of the Integers 1 through 6.)
- enforcedfloat
Enforced displacement value
- classmethod add_card(card, comment='')[source]
Adds a SPCAX card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- component
Component identification number. (Any unique combination of the Integers 1 through 6.)
- conid
Identification number of a single-point constraint set.
- enforced
Enforced displacement value
- hid
Harmonic identification number. (Integer >= 0)
- ringax
Ring identification number. See RINGAX entry.
- type = 'SPCAX'
- class pyNastran.bdf.cards.constraints.SPCOFF(nodes, components, comment='')[source]
Bases:
Constraint1
2
3
4
5
6
7
8
9
SPC
G1
C1
G2
C2
G3
C3
G4
C4
SPC
32
3
5
- classmethod add_card(card, comment='')[source]
Adds a SPCOFF card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- property constraints
- 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 = 'SPCOFF'
- class pyNastran.bdf.cards.constraints.SPCOFF1(components, nodes, comment='')[source]
Bases:
Constraint- classmethod add_card(card, comment='')[source]
Adds a SPCOFF1 card from
BDF.add_card(...)- Parameters:
- cardBDFCard()
a BDFCard object
- commentstr; default=’’
a comment for the card
- property constraints
- 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 = 'SPCOFF1'
- class pyNastran.bdf.cards.constraints.SUPORT(nodes, Cs, comment='')[source]
Bases:
ConstraintDefines determinate reaction degrees-of-freedom in a free body.
1
2
3
4
5
6
7
8
9
SUPORT
ID1
C1
ID2
C2
ID3
C3
ID4
C4
Creates a SUPORT card, which defines free-body reaction points. This is always active.
- Parameters:
- nodeslist[int]
the nodes to release
- Cslist[str]
components to support at each node
- commentstr; default=’’
a comment for the card
- _properties = ['node_ids']
- classmethod add_card(card: BDFCard, comment: str = '')[source]
Adds a SUPORT 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 = 'SUPORT'
- class pyNastran.bdf.cards.constraints.SUPORT1(conid, nodes, Cs, comment='')[source]
Bases:
ConstraintDefines determinate reaction degrees-of-freedom (r-set) in a free body-analysis. SUPORT1 must be requested by the SUPORT1 Case Control command.
1
2
3
4
5
6
7
8
SUPORT1
SID
ID1
C1
ID2
C2
ID3
C3
SUPORT1
1
2
23
4
15
5
0
Creates a SUPORT card, which defines free-body reaction points.
- Parameters:
- conidint
Case Control SUPORT id
- nodeslist[int]
the nodes to release
- Cslist[str]
components to support at each node
- commentstr; default=’’
a comment for the card
- _properties = ['node_ids']
- classmethod add_card(card, comment='')[source]
Adds a SUPORT1 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 = 'SUPORT1'