Resource Documents by Pedersen, Steffen
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 »
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 . . . 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 »
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