pyva.coupling.junctions.Junction

class pyva.coupling.junctions.Junction(systems)

Bases: object

Abstract base class for all Junction classes

Junction handle a specific set of dofs similar to the dynamix DOFS, but the space direction and rotation DOFs are replaced by wave field DOFs for example logitudinal, shear and bending wave fields

The DOF class used the DOF.ID for the identification of the system and the wave_dof for the wave field that is considered as reverberant field

wave_DOF

of the reverberant waves e.g. dof=3 and velocity for bending waves

Type:: DOF

systems

of systems

Type:: list or tupel

__init__(systems)

Class contructor for junction

Parameters:: systems (tupel or list) – systems connected by the junction
Return type:: None.

Methods

`__init__`(systems)	Class contructor for junction
`get_wave_DOF`([ix])	Provides the local wave DOFs of the junction
`index`(ID)	Determines index of ID in system list of junction
`junction_matrix`(omega)	Create empty junction matrix for further calculation in daughter classes
`modal_density`(omega)	Provides modal density

Attributes

`N`	Number of connected physical SEA systems (not wave_fields)
`N_wave`	Number of wave fields
`exc_DOF`	Provides 'excitation' DOFs of junction SEA matrix
`in_dofs`	Provides input wave dofs of junction for upper triangular input matrix
`out_dofs`	Provides output wave dofs of junction for upper triangular input matrix
`res_DOF`	Provides 'response' DOFs of junction SEA matrix

property N

Number of connected physical SEA systems (not wave_fields)

Returns:: number of systems
Return type:: int

property N_wave

Number of wave fields

Returns:: Number of wave fields
Return type:: int

property exc_DOF

Provides ‘excitation’ DOFs of junction SEA matrix

The ‘excitation’ and response DOFs are equal in terms of ID and wave_dof but use ‘power’ as physical input

Returns:: excitation DOFs of junction SEA matrix
Return type:: DOF

get_wave_DOF(ix=slice(None, None, None))

Provides the local wave DOFs of the junction

Returns:: dofs of junction, list of systems
Return type:: DOF,sys_list

property in_dofs

Provides input wave dofs of junction for upper triangular input matrix

These DOFs are requiered to determine the column index of the upper triangular components in the global SEA matrix.

For example a plate - cavity junction has wave dofs [ ID=1,dof=3 ; 1,5 ; 2,0 ]

The full of diag CLF in the SEA matrix are

$\begin{bmatrix} \Sigma & - n_{15}\eta_{15,13} & -n_{20}\eta_{20,13} \\ - n_{13}\eta_{13,15} & \Sigma & -n_{20}\eta_{20,15} \\ - n_{13}\eta_{13,20} & - n_{15}\eta_{15,20} & \Sigma \end{bmatrix}$

The column dofs would be : [ 1,5 ; 2,0 ; 2,0]