ORIGINAL RESEARCH
Analysis of Acoustic Pressure Fluctuation
around Wind Farms
1 1 | Koszalin University of Technology, Faculty of Civil Engineering, Environmental and Geodetic Sciences, Koszalin, Poland |
CORRESPONDING AUTHOR
Submission date: 2017-10-24
Acceptance date: 2017-12-02
Online publication date: 2018-07-02
Publication date: 2018-07-09
Pol. J. Environ. Stud. 2018;27(6):2843–2849
KEYWORDS
noise propagationmodulation of noise amplitudenoise level fluctuationswind turbinenoise measurementsnoise character
TOPICS
ABSTRACT
The aim of this study was to assess the discrepancies of the results of equivalent sound levels
measured locally in relation to changes in acoustic pressure. The article studies both single turbines and
wind farms, where fluctuations in acoustic pressure are clearly audible. The object of this study was
turbines in northwestern and central Poland, which were studied either as single objects or as a group
(several turbines together in one wind farm). Presented results of measurements were selected in terms of
significant disturbances. Despite this process, it was impossible to eliminate the influence of gusts of wind
that showed up in almost all graphs, especially in measurement points of 500 m distance from the edge of
a turbine tower. It was noticed that during sound emissions not all turbines show significant fluctuation
of acoustic pressure levels. It was pointed out that equivalent sound level LAeqT – which in most countries
is the indicator of acoustic climate assessment – forms the above statistical average LA50 calculated from
the measurement of acoustic pressure level SPL and regards the changeability of acoustic pressure levels
in time.