RCAIDE.Library.Methods.Noise.Frequency_Domain_Buildup.Rotor.broadband_noise
broadband_noise#
- broadband_noise(conditions, coordinates, rotor, settings, Noise, cpt)[source]#
This computes the trailing edge noise compoment of broadband noise of a propeller or lift-rotor in the frequency domain. Boundary layer properties are computed using RCAIDE’s panel method.
- Assumptions:
Boundary layer thickness (delta) appear to be an order of magnitude off at the trailing edge and correction factor of 0.1 is used. See lines 255 and 256
- Source:
Li, Sicheng Kevin, and Seongkyu Lee. “Prediction of Urban Air Mobility Multirotor VTOL Broadband Noise Using UCD-QuietFly.” Journal of the American Helicopter Society (2021).
- Inputs:
freestream - freestream data structure [m/s] angle_of_attack - aircraft angle of attack [rad] bspv - rotor blade section trailing position edge vectors [m] velocity_vector - velocity vector of aircraft [m/s] rotors - data structure of rotors [None] aeroacoustic_data - data structure of acoustic data [None] settings - accoustic settings [None] res - results data structure [None]
- Outputs
- res. acoustic data is stored and passed in data structures
SPL_prop_broadband_spectrum - broadband noise in blade passing frequency spectrum [dB] SPL_prop_broadband_spectrum_dBA - dBA-Weighted broadband noise in blade passing frequency spectrum [dbA] SPL_prop_broadband_1_3_spectrum - broadband noise in 1/3 octave spectrum [dB] SPL_prop_broadband_1_3_spectrum_dBA - dBA-Weighted broadband noise in 1/3 octave spectrum [dBA] p_pref_azimuthal_broadband - azimuthal varying pressure ratio of broadband noise [Unitless] p_pref_azimuthal_broadband_dBA - azimuthal varying pressure ratio of dBA-weighted broadband noise [Unitless] SPL_prop_azimuthal_broadband_spectrum - azimuthal varying broadband noise in blade passing frequency spectrum [dB] SPL_prop_azimuthal_broadband_spectrum_dBA - azimuthal varying dBA-Weighted broadband noise in blade passing frequency spectrum [dbA]
- Properties Used:
N/A