Karl Bolin
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View article: An inter-model comparison of parabolic equation methods for sound propagation from wind turbines
An inter-model comparison of parabolic equation methods for sound propagation from wind turbines Open
The modeling of sound propagation for land-based wind turbines is a complex task that takes various parameters into account. Not only do the wind speed and wind direction affect the noise received at a certain position by changing the refr…
View article: Analysis of landing noise from Airbus A321neo using long term noise measurements and flight recorder data
Analysis of landing noise from Airbus A321neo using long term noise measurements and flight recorder data Open
This article analyzes aircraft noise measurements from the Airbus A321neo at 7.5 and 5 nautical miles from the runway threshold. Using correlation, analysis of variance, and hierarchical regression analysis, we assessed the influence of fl…
View article: Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation
Aeroacoustic noise prediction of a vertical axis wind turbine using large eddy simulation Open
This study investigates the numerical prediction for the aerodynamic noise of the vertical axis wind turbine using large eddy simulation and the acoustic analogy. Low noise designs are required especially in residential areas, and sound le…
View article: An investigation of the influence of the refractive shadow zone on wind turbine noise
An investigation of the influence of the refractive shadow zone on wind turbine noise Open
This article aims to investigate if the proportion of the rotor area of a wind turbine that is in the refractive shadow zone according to a ray tracing algorithm coupled to meteorological forecast data is correlated to sound levels and amp…
View article: Impact of low‐level wind maxima below hub height on wind turbine sound propagation
Impact of low‐level wind maxima below hub height on wind turbine sound propagation Open
An analysis of the effect of low‐level wind maxima (LLWM) below hub height on sound propagating from wind turbines has been performed at a site in northern Sweden. The stably stratified boundary layer, which is typical for cold climates, c…
View article: Understanding Loudness Variations for Aircraft Landing Procedures at Arlanda (ULLA)
Understanding Loudness Variations for Aircraft Landing Procedures at Arlanda (ULLA) Open
As of today air traffic is increasing at Arlanda airport, resulting in higher noise levels.This project has been launched to investigate the possibilities of optimizing flight procedures for a quieter approach.A network of acoustic measure…
View article: Proceedings of the 10th Aerospace Technology Congress, October 8-9, 2019, Stockholm, Sweden
Proceedings of the 10th Aerospace Technology Congress, October 8-9, 2019, Stockholm, Sweden Open
From the systems engineering standpoint, an aircraft may be considered a complex system consisting of multiple subsystems operating in an integrated manner, within several operational environments.During the operation, deviations from the …