seapy.components.acoustical3d.SubsystemLong

class seapy.components.acoustical3d.SubsystemLong(name, system, **properties)[source]

Bases: seapy.subsystems.subsystemacoustical.SubsystemAcoustical

Subsystem for a fluid in a 3D cavity.

__init__(name, system, **properties)

Constructor.

Parameters:
  • name (string) – Identifier
  • component (SeaPy.components.Component) – Component

Methods

__init__(name, system, **properties) Constructor.
addExcitation(name, model, **properties) Add excitation to subsystem.
disable([couplings]) Disable this subsystem.
enable([couplings]) Enable this subsystem.
impedance_point_volume(excitation) Impedance of a 3D cavity when there is a monopole (volume) source in the cavity.
info([attributes]) Return dataframe.
plot(quantity[, yscale]) Plot quantity.

Attributes

SORT str(object=’‘) -> str
average_frequency_spacing Average frequency spacing for a fluid in a 3D cavity.
classname Name of class of the object.
component
conductance Conductance G.
conductance_point_average Average point conductance of an acoustic component.
damping_term The damping term is the ratio of the modal half-power bandwidth to the average modal frequency spacing.
dlf Damping loss factor of subsystem.
enabled Switch indicating whether the object is enabled.
energy Total energy E in subsystem.
frequency Frequency.
impedance Impedance Z
included Indicates whether the object is included in the analysis.
linked_couplings_from
linked_couplings_to
linked_excitations
mobility Mobility Y
modal_density Modal density.
modal_energy Class capable of containing spectral values.
modal_overlap_factor Modal overlap factor.
name
power_input Total input power due to excitations.
pressure Mean sound pressure p.
pressure_level Sound pressure level L_p.
resistance Resistance R, the real part of the impedance Z.
resistance_point_average Average point resistance of an acoustic component.
soundspeed_group Group speed of a fluid in a duct with rigid walls.
soundspeed_phase Phase speed of a fluid in a duct with rigid walls.
tlf Total loss factor.
wavenumber Wavenumber.
average_frequency_spacing[source]

Average frequency spacing for a fluid in a 3D cavity.

\overline{\delta f}_0^{3D} = \frac{c_0^^3}{4 \pi V f^2}

See Lyon, eq 8.3.7

impedance_point_volume(excitation)[source]

Impedance of a 3D cavity when there is a monopole (volume) source in the cavity.

Parameters:excitation (seapy.excitations.ExcitationPoint) – Excitation.

Z_0^{U,3D} = \frac{\pi \rho f^2}{c_0} \left( 1 + \frac{j}{k_0 r}   \right)

See Lyon, table 10.1, last row.

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