LineSpring

class planestress.pre.boundary_condition.LineSpring(point1: tuple[float, float], point2: tuple[float, float], direction: str, value: float)

Bases: LineBoundaryCondition

Class for adding springs along a line.

Variables:

mesh_tag – Tagged line object.

Methods

apply_bc	Applies the boundary condition.
get_unique_nodes	Returns a list of unique node indexes along the line BC.

__init__(point1: tuple[float, float], point2: tuple[float, float], direction: str, value: float) → None

Inits the LineSpring class.

Parameters:

• point1 (tuple[float, float]) – Point location (x, y) of the start of the line.

• point2 (tuple[float, float]) – Point location (x, y) of the end of the line.

• direction (str) – Direction of the boundary condition, "x" or "y".

• value (float) – Value of the boundary condition.

apply_bc(k: ndarray[Any, dtype[float64]], f: ndarray[Any, dtype[float64]]) → tuple[ndarray[Any, dtype[float64]], ndarray[Any, dtype[float64]]]

Applies the boundary condition.

Parameters:

• k (ndarray[Any, dtype[float64]]) – Stiffness matrix.

• f (ndarray[Any, dtype[float64]]) – Load vector.

Returns:

Modified stiffness matrix and load vector (k, f).

Return type:

tuple[ndarray[Any, dtype[float64]], ndarray[Any, dtype[float64]]]

get_unique_nodes() → list[int]

Returns a list of unique node indexes along the line BC.

Returns:

List of unique node indexes along the line.

Return type:

list[int]