RCAIDE.Library.Methods.Aeroacoustics.Semi_Empirical.Airframe.airframe_noise

airframe_noise#

airframe_noise(microphone_locations, segment, config, settings)[source]#

This computes the noise from different sources of the airframe for a given vehicle for a constant altitude flight.

Parameters:

microphone_locations (array_like) – Coordinates of the microphones used to capture noise data.
segment (RCAIDE type segment) –
Contains flight path data and conditions.
- conditionsobject
  Contains freestream velocity, kinematic viscosity, and mach number.
- framesobject
  Contains inertial time data.
config (RCAIDE type config) –
Configuration of the vehicle including wings and landing gears.
- wingslist
  List of wing objects with attributes like taper, areas, spans, and control surfaces.
- landing_gearslist
  List of landing gear objects with attributes like tire diameter, strut length, and gear status.
settings (object) – Contains settings such as center frequencies for noise calculations.

Returns:

airframe_noise –

Contains the computed noise data.

SPLfloat
Sound Pressure Level.
SPL_1_3_spectrumarray_like
One Third Octave Band SPL spectrum.
SPL_dBAfloat
A-weighted Sound Pressure Level.
noise_timearray_like
Time discretization of the noise data.

Return type:

Data

Notes

The function assumes a correlation-based noise computation method. It uses the noise component method as described by Fink (1979) to calculate the noise from various airframe components.

Major Assumptions

Constant altitude flight
Correlation-based noise computation

Theory

The noise is computed using the noise component method, which involves calculating the noise from individual components like wings, tails, flaps, and landing gears, and then summing them incoherently.

Definitions

‘SPL’: Sound Pressure Level, a measure of the sound intensity.

References

[1] Fink, Martin R. “Noise component method for airframe noise.” Journal of aircraft 16.10 (1979): 659-665.