pyva.systems.infiniteLayers.ImperviousScreenLayer

class pyva.systems.infiniteLayers.ImperviousScreenLayer(plate_prop, perforation=None)

Bases: SolidLayer

Class for Modelling Impervious screen or thin plate as InfiniteLayer.

The impervious screen formulation consideres the in-plane motion of the plate and in contrast to the PlateLayer the in plane stress and motion is connected the next layer.

However, the layer is considered as thin and the in-plane motion does not lead to moments or bending.

thickness

thickness of the perforted layer

Type:

float

prop

property of plate modelled as 3D layer

Type:

PlateProp

perforation

optional additional perforation of the plate

Type:

ResistiveLayer

__init__(plate_prop, perforation=None)

Class contructor for ImperviousScreenLayer objects.

Parameters:

• plate_prop (PlateProp) – plate property of layer

• perforation (ResistiveLayer) – optional additional perforation of the plate

Methods

__init__(plate_prop[, perforation])	Class contructor for ImperviousScreenLayer objects.
get_xdata(omega, kx)	Determine the appropriate xdata from omega and kx.
transfer_impedance(omega[, kx, ID, allard])	Transferimpedance of ImperviousScreenLayer

Attributes

isequivalentfluid	Determine if layer is of type equivalent fluid
mass_per_area	Mass per area of SolidLayer.

static get_xdata(omega, kx)

Determine the appropriate xdata from omega and kx.

Infinite Layer theory often involves integration over wavenumber. Thus, the kx is the integration variable.

If omega is scalar xdata will be wavenumber in x (kx) if kx is scalar xdata will be angular frequency if kx and omega have same dimension it is assumed that kx belongs to a constant angle and is given by kx = omega/c0*sin(theta) and xdata will be angular frequency

Parameters:

• omega (float or ndarray) – angular frequency

• kx (float or ndarray) – wavenumber

Returns:

wavenumber or omega as DataAxis object

Return type:

DataAxis

property isequivalentfluid

Determine if layer is of type equivalent fluid

Defauls parameter is False

Returns:

False.

Return type:

bool

property mass_per_area

Mass per area of SolidLayer.

Returns:

mass per area.

Return type:

float

transfer_impedance(omega, kx=0, ID=[1, 2], allard=False)

Transferimpedance of ImperviousScreenLayer

Implementation according to [All2009].

Parameters:

• omega (float or ndarray) – scalar angular frequency

• kx (float or ndarray, optional) – In-plane wavenumber. The default is 0.

• ID (list of int) – Left and right ID. The default is [1,2].

Returns:

[2 x 2] array of transferimpedance

Return type:

DynamicMatrix