Determination of Absolute Contributions of Aircraft Noise Components Using Fly-over Array Measurements

Influence of mesoscale urban morphology on the spatial noise attenuation of flyover aircrafts

“…Low-density residential areas are considered, because they have relatively low noise resistance and they are more common near airports. The study focuses on flyover landing aircrafts or helicopters, of which the noise is prone to be loud, lasting and annoying [12,[15][16][17][18]. In particular, this study aims to find out (1) the effects of horizontal distance between a site and flight path; (2) the effects of altitude of flight path.…”

Functional Beamforming Applied to Imaging of Flyover Noise on Landing Aircraft

“…Beamforming techniques are increasingly being used in the aerospace industry in order to support the development of noise reduction techniques [4][5][6][7][8][9][10][11][12]. In the case of fly-over measurements, the data generally have to be pre-processed to take into account the background noise, the propagation effects (geometrical spreading and atmospheric attenuation), ground reflection, the movement of the source and the Doppler effect [13,14].…”

Preliminary Analysis of Acoustic Measurements from the NASA-Gulfstream Airframe Noise Flight Test

“…Using U 6 and Strouhal scaling of the SPL spectra obtained at different speeds failed to collapse the data into a single spectrum. The best data collapse was obtained when the frequencies were left unscaled.…”

“…Full-scale fly-over noise measurements in the US and Europe have been instrumental in identifying the predominant airframe noise sources for civil transports [1][2][3][4][5][6] as well as help advance the development of phased microphone array design and post processing techniques 6 . Although expensive and intricate, full-scale tests provide the natural environment whereby installation, geometric fidelity, and Reynolds number effects on noise generation and radiation are addressed simultaneously.…”