Details
| Original language | English |
|---|---|
| Publication status | Published - 2019 |
| Event | 15th EAWE PhD Seminar on Wind Energy - Nantes, France Duration: 29 Oct 2019 → 30 Oct 2019 |
Conference
| Conference | 15th EAWE PhD Seminar on Wind Energy |
|---|---|
| Country/Territory | France |
| Period | 29 Oct 2019 → 30 Oct 2019 |
Abstract
The measured insertion loss increase with higher frequencies and with the amount of windscreen layers. Hence, the acoustic properties are most strongly affected by the windscreen with a triple layer. In the relevant low-frequency bands, all windscreen configurations have a small influence on the acoustic properties. Results of a field test nearby a wind turbine show that at 7 m/s the excess noise dominates octave bands below 125 Hz and covers the turbine noise using only a primary wind- screen. This excess noise can be reduced by up to 10 dB using secondary windscreens so that the wind turbine noise is detectable. Considering only the field test, the windscreen with a triple layer has the biggest potential to reduce the wind-induced noise at microphones.
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2019. Paper presented at 15th EAWE PhD Seminar on Wind Energy , France.
Research output: Contribution to conference › Paper › Research
}
TY - CONF
T1 - Towards the use of secondary windscreens to improve wind turbine sound measurements
AU - Martens, Susanne
AU - Bohne, Tobias
AU - Rolfes, Raimund
PY - 2019
Y1 - 2019
N2 - One of the major challenges for acoustic measurements nearby wind turbines is a sufficiently high signal-to-noise ratio between wind turbine and background noise. In the low frequency bands, the background noise is characterized by wind-induced noise at the microphone, which are caused by inflow turbulences. Those turbulences and hence, the wind-induced noise can be reduced by wind- screens. In this contribution, four windscreen configurations are analysed regarding their influence on the acoustic properties and their potential of excess noise reduction. Hereby, a standard primary windscreen and secondary windscreens with different diameters and amount of layers are used.The measured insertion loss increase with higher frequencies and with the amount of windscreen layers. Hence, the acoustic properties are most strongly affected by the windscreen with a triple layer. In the relevant low-frequency bands, all windscreen configurations have a small influence on the acoustic properties. Results of a field test nearby a wind turbine show that at 7 m/s the excess noise dominates octave bands below 125 Hz and covers the turbine noise using only a primary wind- screen. This excess noise can be reduced by up to 10 dB using secondary windscreens so that the wind turbine noise is detectable. Considering only the field test, the windscreen with a triple layer has the biggest potential to reduce the wind-induced noise at microphones.
AB - One of the major challenges for acoustic measurements nearby wind turbines is a sufficiently high signal-to-noise ratio between wind turbine and background noise. In the low frequency bands, the background noise is characterized by wind-induced noise at the microphone, which are caused by inflow turbulences. Those turbulences and hence, the wind-induced noise can be reduced by wind- screens. In this contribution, four windscreen configurations are analysed regarding their influence on the acoustic properties and their potential of excess noise reduction. Hereby, a standard primary windscreen and secondary windscreens with different diameters and amount of layers are used.The measured insertion loss increase with higher frequencies and with the amount of windscreen layers. Hence, the acoustic properties are most strongly affected by the windscreen with a triple layer. In the relevant low-frequency bands, all windscreen configurations have a small influence on the acoustic properties. Results of a field test nearby a wind turbine show that at 7 m/s the excess noise dominates octave bands below 125 Hz and covers the turbine noise using only a primary wind- screen. This excess noise can be reduced by up to 10 dB using secondary windscreens so that the wind turbine noise is detectable. Considering only the field test, the windscreen with a triple layer has the biggest potential to reduce the wind-induced noise at microphones.
M3 - Paper
T2 - 15th EAWE PhD Seminar on Wind Energy
Y2 - 29 October 2019 through 30 October 2019
ER -