RCAIDE.Library.Methods.Aeroacoustics.Semi_Empirical.Airframe.clean_wing_noise

clean_wing_noise#

clean_wing_noise(S, b, ND, IsHorz, velocity, viscosity, M, phi, theta, distance, frequency)[source]#

This computes the 1/3 octave band sound pressure level and the overall sound pressure level from the clean wing.

Parameters:

  • S (float) – Wing area [sq.ft].

  • b (float) – Wing span [ft].

  • ND (int) – Constant from the method, set to 0 for clean wings and 1 for others.

  • IsHorz (int) – Constant from the method, set to 1 for horizontal components.

  • velocity (float) – Aircraft speed [kts].

  • viscosity (float) – Dynamic viscosity.

  • M (float) – Mach number.

  • phi (float) – Azimuthal angle [rad].

  • theta (float) – Polar angle [rad].

  • distance (float) – Distance from airplane to observer, evaluated at retarded time [ft].

  • frequency (array_like) – Frequency array [Hz].

Returns:

SPL – Sound Pressure Level of the clean wing [dB].

Return type:

array_like

Notes

The function uses correlation-based methods to compute the noise levels from the clean wing.

Definitions

‘SPL’

Sound Pressure Level, a measure of the sound intensity.

References

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