seapy.components.beam.SubsystemLong

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

Bases: seapy.subsystems.subsystemstructural.SubsystemStructural

Subsystem for longitudinal waves in a 1D system.

__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.
info([attributes]) Return dataframe.
plot(quantity[, yscale]) Plot quantity.

Attributes

SORT str(object=’‘) -> str
average_frequency_spacing Average frequency spacing for longitudinal waves.
classname Name of class of the object.
component
conductance Conductance G.
conductance_point_average Average point conductance of a structural 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
impedance_point_force Impedance for longitudinal waves in a bar when excited at a point by a force.
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.
resistance Resistance R, the real part of the impedance Z.
resistance_point_average Average point resistance.
soundspeed_group Group velocity for longitudinal wave.
soundspeed_phase Phase velocity for longitudinal wave.
tlf Total loss factor.
velocity Vibrational velocity v.
velocity_level Velocity level L_v.
wavenumber Wavenumber in radians per unit length.
average_frequency_spacing[source]

Average frequency spacing for longitudinal waves.

Return type:numpy.ndarray

\overline{\delta f}_L^{1D} = \frac{c_{L, \phi}^{1D}}{2L}

See Lyon, eq. 8.1.7

impedance_point_force[source]

Impedance for longitudinal waves in a bar when excited at a point by a force.

Return type:numpy.ndarray

Z_{L}^{F, 1D} = 2 \rho S c_L

See Lyon, table 10.1, first row.

soundspeed_group[source]

Group velocity for longitudinal wave.

Return type:numpy.ndarray

c_{L,g}^{1D} = c_{L,\phi}^{1D}

soundspeed_phase[source]

Phase velocity for longitudinal wave.

Return type:numpy.ndarray

c_{L,\phi}^{1D} = \frac{E}{\rho}

wavenumber[source]

Wavenumber in radians per unit length.

Parameters:
  • N – mode
  • delta – boundary condition dependent constant
Return type:

numpy.ndarray

k = (N + \delta_{BC} ) \frac{\pi}{L}

See Lyon, equation 8.1.2

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