pyva.systems.infiniteLayers.ResistiveLayer

class pyva.systems.infiniteLayers.ResistiveLayer(thickness, impedance)

Bases: AcousticLayer

The ResistiveLayer class deals with lumped acoustic infinite layers.

In most cases this is a resistive sheet with measured resistivity

left_dof

degrees of freedom of left connection

Type:

DOF

right_dof

degrees of freedom of left connection

Type:

DOF

thickness

thickness of the layer

Type:

float

impedance

transfer impedance function with omega as argument.

Type:

function (of omega)

__init__(thickness, impedance)

Class contructor Resistivelayer.

Parameters:

  • thickness (float) – thickness of the layer

  • impedance (function (of omega)) – transfer impedance function with omega as argument.

Return type:

None.

Methods

__init__(thickness, impedance)

Class contructor Resistivelayer.

get_xdata(omega, kx)

Determine the appropriate xdata from omega and kx.

plot(omega, **kwargs)

Plots the transfer impedance for the related part

transfer_impedance(omega[, kx, ID])

Transferimpedance of perforateLayer

Attributes

isequivalentfluid

Determine if layer is of type equivalent fluid

visc_air

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 True

Returns:

True.

Return type:

bool

plot(omega, **kwargs)

Plots the transfer impedance for the related part

Parameters:

  • omega (float) – angular frequency.

  • fig (int, optional) – figure ID. The default is 1.

  • **kwargs (dict) – Arbitrary keyword parameter list passed to Signal.plot.

Return type:

None.

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

Transferimpedance of perforateLayer

The transferimpedance is caluclated based on the lumped_acoustic model, because it is independent from the kx

Parameters:

  • omega (float or ndarray) – scalar angular frequency

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

  • ID (list of int, optional) – Left and right when overwritten, None takes object ID. The default is None.

Returns:

[2 x 2] array of transferimpedance

Return type:

DynamicMatrix