pyva.systems.acoustic1Dsystems.HelmholtzResonator

class pyva.systems.acoustic1Dsystems.HelmholtzResonator(volume, length, radius, fluid=Fluid(c0=air, rho0=1.23, eta=0.01), length_correction_factor=1.7, **kwargs)

Bases: object

The HelmholtzResonator class provides methods for modelling of HR

volume

Type:: volume of the resonace volume

length

Type:: length of the neck

radius

Type:: radius of neck

length_correction

Type:: sum of upper and lower correction part

Fluid

Type:: fluid in the system

end_impedance

Type:: function handle for end transfer impedance

__init__(volume, length, radius, fluid=Fluid(c0=air, rho0=1.23, eta=0.01), length_correction_factor=1.7, **kwargs)

Class contructor for helholtzResonator

Parameters:

volume (float) – volume of the resonace volume
length (float) – length of the neck
radius (float) – radius of neck
length_correction_factor (float) – sum of upper and lower end correction as factor of radius
fluid (fluid) – fluid in the system
KwArgs (dict) – Arbitrary keyword parameter list
end_impedance (function) – radiation impedance of end correction

Methods

`__init__`(volume, length, radius[, fluid, ...])	Class contructor for helholtzResonator
`acoustic_FE`(omega[, ID])	Acoustic Point Element of HR
`omega_resonance`()	Angular resonance frequency of HR
`radiation_impedance`(omega)	Radiation impedance of a HelmholtzResonator Za = p/Q

Attributes

area

Area property

acoustic_FE(omega, ID=[1], **kwargs)

Acoustic Point Element of HR

A p = q with A = 1/Z_rad

Uses the HR radiation impedance to determine the properties of this point element.

Parameters:

omega (float) – angular frequency.
ID (list of int) – node ID.

Returns:

single DOF FE representation of HR

Return type:

Dynamic matrix

property area

Area property

Returns:: area.
Return type:: float

omega_resonance()

Angular resonance frequency of HR

Assumes the resistance free resonance frequency

Returns:: resonance angular frequency
Return type:: float

radiation_impedance(omega)

Radiation impedance of a HelmholtzResonator Za = p/Q

Parameters:: omega (float) – angular frequency.
Returns:: Z – radiation impedance.
Return type:: complex