RCAIDE.Library.Methods.Aeroacoustics.Semi_Empirical.Airframe.landing_gear_noise

landing_gear_noise#

landing_gear_noise(D, H, wheels, M, velocity, phi, theta, distance, frequency)[source]#

This calculates the Landing gear 1/3 octave band sound pressure level and overall sound pressure level.

Parameters:

  • D (float) – Landing gear tyre diameter.

  • H (float) – Landing gear strut length.

  • wheels (int) – Number of wheels per unit.

  • M (float) – Mach number.

  • velocity (float) – Aircraft speed.

  • 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 landing gear [dB].

Return type:

array_like

Notes

The function uses correlation-based methods to compute the noise levels from the landing gear.

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.