Constraint handler¶

class
xc.
ConstraintHandler
¶ Bases:
xc.MovableObject
,xc_base.CommandEntity
Constraint handlers enforce the single and multi freedom constraints that exist in the domain by creating the appropriate FE_Element and DOF_Group objects.

class
xc.
FactorsConstraintHandler
¶ Bases:
xc.ConstraintHandler
Base class for penalty and Lagrange constraints handlers.

alphaMP
¶ Factor applied with multifreedom constraints.

alphaSP
¶ Factor applied with singlefreedom constraints.


class
xc.
PenaltyConstraintHandler
¶ Bases:
xc.FactorsConstraintHandler
Handle single and multi point constraints by using the penalty method. This is done by, in addition to creating a DOF_Group object for each Node and an FE_Element for each Element in the Domain, creating either a PenaltySFreedom_FE or a PenaltyMP_FE object for each constraint in the Domain. It is these objects that enforce the constraints by modifying the tangent matrix and residual vector.

class
xc.
LagrangeConstraintHandler
¶ Bases:
xc.FactorsConstraintHandler
Handle single and multi point constraints by using the Lagrange multipliers method. This is done by, in addition to creating a DOF_Group object for each Node and an FE_Element for each Element in the Domain, creating a LagrangeDOF_Group object and either a LagrangeSFreedom_FE or a LagrangeMP_FE object for each constraint in the Domain. It is these objects that enforce the constraints by modifying the tangent matrix and residual vector.

class
xc.
PlainHandler
¶ Bases:
xc.ConstraintHandler
Handle homogeneous single point constraints. Create regular FE_Element and DOF_Group objects and enforce the constraints by specifying that degreesoffreedom which are constrained are not assigned an equation number.

class
xc.
TransformationConstraintHandler
¶ Bases:
xc.ConstraintHandler
Handle single and multi point constraints by using the Lagrange multipliers method. This is done by, in addition to creating a DOF_Group object for each Node and an FE_Element for each Element in the Domain, creating either a TransformationSFreedom_FE or a TransformationMP_FE object for each constraint in the Domain. It is these objects that enforce the constraints by modifying the tangent matrix and residual vector.