bush
Module¶
All bush properties are defined in this file. This includes:
- PBUSH
- PBUSH1D
- PBUSH2D (not implemented)
- PBUSHT
All bush properties are BushingProperty and Property objects.
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class
pyNastran.bdf.cards.properties.bush.
BushingProperty
[source]¶ Bases:
pyNastran.bdf.cards.base_card.Property
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type
= 'BushingProperty'¶
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class
pyNastran.bdf.cards.properties.bush.
PBUSH
(pid, k, b, ge, rcv=None, mass=None, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bush.BushingProperty
Generalized Spring-and-Damper Property Defines the nominal property values for a generalized spring-and-damper structural element.
1 2 3 4 5 6 7 8 9 PBUSH PID K K1 K2 K3 K4 K5 K6 B B1 B2 B3 B4 B5 B6 GE GE1 GE2 GE3 GE4 GE5 GE6 RCV SA ST EA ET M MASS Creates a PBUSH card, which defines a property for a CBUSH
Parameters: - pid : int
property id
- k : List[float]
Nominal stiffness values in directions 1 through 6. len(k) = 6
- b : List[float]
Nominal damping coefficients in direction 1 through 6 in units of force per unit velocity len(b) = 6
- ge : List[float]
Nominal structural damping constant in directions 1 through 6. len(ge) = 6
- rcv : List[float]; default=None -> (None, None, None, None)
[sa, st, ea, et] = rcv length(mass_fields) = 4
- mass : float; default=None
lumped mass of the CBUSH This is an MSC only parameter.
- comment : str; default=’‘
a comment for the card
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classmethod
add_card
(card, comment='')[source]¶ Adds a PBUSH card from
BDF.add_card(...)
Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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pid
= None¶ Property ID
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pname_map
= {-23: 'ET', -22: 'EA', -21: 'ST', -20: 'SA', -19: 'GE6', -18: 'GE5', -17: 'GE4', -16: 'GE3', -15: 'GE2', -14: 'GE1', -13: 'B6', -12: 'B5', -11: 'B4', -10: 'B3', -9: 'B2', -8: 'B1', -7: 'K6', -6: 'K5', -5: 'K4', -4: 'K3', -3: 'K2', -2: 'K1'}¶
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repr_fields
(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
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type
= 'PBUSH'¶
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class
pyNastran.bdf.cards.properties.bush.
PBUSH1D
(pid, k=0.0, c=0.0, m=0.0, sa=0.0, se=0.0, optional_vars=None, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bush.BushingProperty
1 2 3 4 5 6 7 8 PBUSH1D PID K C M SA SE SHOCKA TYPE CVT CVC EXPVT EXPVC IDTS IDETS IDECS IDETSD IDECSD SPRING TYPE IDT IDC IDTDU IDCDU DAMPER TYPE IDT IDC IDTDV IDCDV GENER IDT IDC IDTDU IDCDU IDTDV IDCDV Creates a PBUSH1D card
Parameters: - pid : int
property id
- k : float
stiffness
- c : float
Viscous damping
- m : float
mass
- sa : float
Stress recovery coefficient [1/area].
- se : float
Strain recovery coefficient [1/length].
- optional_vars : dict[name]
- name : str
SHOCKA, SPRING, DAMPER, GENER
- values : List[varies]
the values
- SHOCKA:
Coefficients of the following force versus velocity/displacement relationship F(u, v) = Cv * S(u) * sign(v) * |v|^EXPV TYPE CVT CVC EXPVT EXPVC IDTS IDETS IDECS IDETSD IDECSD CVT/CVC : int
Viscous damping coefficient CV for tension v > 0, force per unit velocity.
- EXPVT/EXPVC : int
Exponent of velocity EXPV for tension v > 0 (or compression v < 0).
- IDTS : int
Identification number of a TABLEDi entry for tension and compression if TYPE=TABLE. The TABLEDi entry defines the scale factor S, versus displacement u.
- IDETS/IDECS : int
Identification number of a DEQATN entry for tension if TYPE=EQUAT. The DEQATN entry defines the scale factor S, versus displacement u, for tension u > 0 (or compression v < 0).
- IDETSD/IDECSD : int
Identification number of a DEQATN entry for tension if TYPE=EQUAT. The DEQATN entry defines the defines the scale factor S, versus displacement u, for tension u > 0 (or compression v < 0).
- SPRING:
Nonlinear elastic spring element in terms of a force versus displacement relationship TYPE IDT IDC IDTDU IDCDU
- DAMPER:
Nonlinear viscous element in terms of a force versus velocity relationship. TYPE IDT IDC IDTDV IDCDV
- GENER:
General nonlinear elastic spring and viscous damper element in terms of a force versus displacement and velocity relationship. For this element, the relationship can only be defined with TYPE=EQUAT (and it’s implicit). IDT IDC IDTDU IDCDU IDTDV IDCDV
- TYPE : int
the type of the result; {TABLE, EQUAT}
- IDT/IDC : int
tension/compression table/equation
- IDTDU/IDCDU : int
du/dt tension/compression table/eq
- IDTDV/IDCDV : int
dv/dt tension/compression table/eq
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_properties
= ['pname_fid_map']¶
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classmethod
add_card
(card, comment='')[source]¶ Adds a PBUSH1D card from
BDF.add_card(...)
Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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pid
= None¶ Property ID
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pname_fid_map
= {'C': 'c', 'K': 'k', 'M': 'm'}¶
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repr_fields
(self)[source]¶ Gets the fields in their simplified form
Returns: - fields : List[varies]
the fields that define the card
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type
= 'PBUSH1D'¶
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class
pyNastran.bdf.cards.properties.bush.
PBUSH2D
(card=None, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bush.BushingProperty
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type
= 'PBUSH2D'¶
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class
pyNastran.bdf.cards.properties.bush.
PBUSHT
(pid, k_tables, b_tables, ge_tables, kn_tables, comment='')[source]¶ Bases:
pyNastran.bdf.cards.properties.bush.BushingProperty
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classmethod
add_card
(card, comment='')[source]¶ Adds a PBUSHT card from
BDF.add_card(...)
Parameters: - card : BDFCard()
a BDFCard object
- comment : str; default=’‘
a comment for the card
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type
= 'PBUSHT'¶
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classmethod