Pilot study on perceived sleep acceptability of low-frequency, amplitude modulated tonal noise
* Presenting author
The presence of amplitude modulation (AM) in wind farm noise has been shown to result in increased annoyance. An equivalent unmodulated noise would have to be louder by several decibels to be as equally annoying as modulated noise. Despite this finding, many standards and guidelines do not specify a penalty for the presence of AM. This study investigates the prevalence of AM over a 1 year period at four different residences located between approximately 1 km and 3.5 km from three different wind farms. The analysis is based on continuous measurements of raw time data that were collected using remote monitoring systems. Preliminary results will be presented based on the data that has been collected and analysed to date. As well as considering the percentage of time that wind farm AM is present, this investigation considers other factors such as the AM depth and wind farm power output. The results provide insight into the prevalence and characteristics of AM at various distances from a wind farm over a significant period of time.