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Resource Documents by Møller

Pedersen, Steffen; Møller, Henrik; and Persson Waye, Kerstin
Indoor Measurements of Noise at Low Frequencies – Problems and Solutions
ABSTRACT: Due to standing waves, the sound pressure level within a room may vary as much as 20-30 dB at low frequencies. Principal properties of low-frequency sound in rooms are illustrated by simulations, and sound pressure distributions as well as the performance of Swedish and Danish measurement methods are studied by measurements in three rooms. For assessment of annoyance, mainly areas of the room with high sound pressure levels are of interest, since persons present in such areas are not . . . Complete article »

Møller, Henrik; and Pedersen, Christian Sejer
Hearing at low and infrasonic frequencies
Abstract. The human perception of sound at frequencies below 200 Hz is reviewed. Knowledge about our perception of this frequency range is important, since much of the sound we are exposed to in our everyday environment contains significant energy in this range. Sound at 20-200 Hz is called low-frequency sound, while for sound below 20 Hz the term infrasound is used. The hearing becomes gradually less sensitive for decreasing frequency, but despite the general understanding that infrasound is inaudible, humans . . . Complete article »

Pedersen, Christian Sejer; Møller, Henrik; and Pedersen, Steffen
Low-frequency noise from large wind turbines – additional data and assessment of new Danish regulations
Summary. Previous studies have shown that the noise has more low-frequency content, when wind turbines get larger, and with todays’ megawatt turbines the low-frequency noise may cause annoyance for the neighbours. Therefore, low-frequency noise has been included in the noise regulations on wind turbines in Denmark. In this study, the data material has been increased to include more data on noise from modern production turbines up to 3.6 MW. In addition, the new Danish regulations are assessed. The previous result that . . . Complete article »

Møller, Henrik; Pedersen, Steffen; Kloster Staunstsrup, Jan; and Sejer Pedersen, Christian
Assessment of low-frequency noise from wind turbines in Maastricht
Introduction Sound and noise can be characterized by their frequency. The range from 20 Hz to 20 kHz (20 cycles per second to 20,000 cycles per second) is usually called the normal hearing range or the audio frequency range. Sound with frequencies above 20 kHz is denoted ultrasound and cannot be heard by humans. Sound with frequencies below 20 Hz is denoted infrasound. It is usually understood that also infrasound cannot be heard, but this is wrong. Infrasound is audible . . . Complete article »

Møller, Henrik; and Pedersen, Christian Sejer
Low-frequency noise from large wind turbines
[Abstract] As wind turbines get larger, worries have emerged that the turbine noise would move down in frequency and that the low-frequency noise would cause annoyance for the neighbors. The noise emission from 48 wind turbines with nominal electric power up to 3.6 MW is analyzed and discussed. The relative amount of low-frequency noise is higher for large turbines (2.3–3.6 MW) than for small turbines (≤ 2 MW), and the difference is statistically significant. The difference can also be expressed as a downward . . . Complete article »

Pedersen, Christian Sejer; and Møller, Henrik
Analysis of low frequency noise from large wind turbines
[abstract] As wind turbines get larger, worries have emerged, that the noise emitted by the turbines would move down in frequency, and that the contents of low-frequency noise would be enough to cause significant annoyance for the neighbors. The sound emission from 48 wind turbines with nominal electric power between 75 kW and 3.6 MW was analyzed. The apparent sound power, LWA, increases with electric power at a rate close to 3 dB per doubling of electric power. The low-frequency proportion . . . Complete article »

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