pystran.freedoms module#

Define the functions for defining and manipulating degrees of freedom.

pystran.freedoms.ALL_DOFS = 100#

This (ALL_DOFS) is a designation of all the degrees of freedom, translations and rotations (U1, U2, UR3 in 2D models, or U1, U2, U3, UR1, UR2, UR3 in 3D models). It may be used to specify the clamped condition for the joint.

pystran.freedoms.TRANSLATION_DOFS = 200#

This (TRANSLATION_DOFS) is a designation of the translation degrees of freedom (U1, U2, in 2D models, or U1, U2, U3 in 3D models). It may be used to specify the pinned condition for the joint.

pystran.freedoms.U1 = 0#

This is a designation of the degree of freedom as translation along X.

pystran.freedoms.U2 = 1#

This is a designation of the degree of freedom as translation along Z (in 2D models) or along Y (in 3D models).

pystran.freedoms.U3 = 2#

This is a designation of the degree of freedom as translation along Z (in 3D models).

pystran.freedoms.UR1 = 3#

This is a designation of the degree of freedom as rotation about X (in 3D models).

pystran.freedoms.UR2 = 4#

This is a designation of the degree of freedom as rotation about Y (in 3D models).

pystran.freedoms.UR3 = 5#

This is a designation of the degree of freedom as rotation about Y (in 2D models) or rotation about Z (in 3D models).

pystran.freedoms.prescribed_dofs_and_values(dim, dof, value)[source]#

Compute prescribed degrees of freedom and values for a particular support type.

Parameters:

  • dim – Dimension of the model (2 or 3).

  • dof – One of the designations of a degree of freedom. Either individual (U1, …), or collective (ALL_DOFS, …).

  • value – A single number, prescribed by the user.

Returns:

For a single dof and value, return just the tuple of the [dof] and [value].

For dof equal to ALL_DOFS, return the translation and rotation degrees of freedom and zero values.

For dof equal to TRANSLATION_DOFS, return the translation degrees of freedom and zero values.

Return type:

tuple of lists

pystran.freedoms.rotation_dofs(dim)[source]#

List the rotation degrees of freedom.

Parameters:

dim – Dimension of the model (2 or 3).

Returns:

The list varies according to whether dim implies two dimensions (2) or three dimensions (3): [UR3] or [UR1, UR2, UR3].

Return type:

list

pystran.freedoms.translation_and_rotation_dofs(dim)[source]#

List both the translation and rotation degrees of freedom.

Parameters:

dim – Dimension of the model (2 or 3).

Returns:

The list varies according to whether dim implies two dimensions (2) or three dimensions (3).

Return type:

list

See also

translation_dofs(), rotation_dofs()

pystran.freedoms.translation_dofs(dim)[source]#

List the translation degrees of freedom.

Parameters:

dim – Dimension of the model (2 or 3).

Returns:

The list varies according to whether dim implies two dimensions (2) or three dimensions (3): [U1, U2] or [U1, U2, U3].

Return type:

list