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Wyszukujesz frazę "wind turbines" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Annoyance Related to Wind Turbine Noise
Autorzy:
Pawlaczyk-Łuszczyńska, M.
Dudarewicz, A.
Zaborowski, K.
Zamojska-Daniszewska, M.
Waszkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/178067.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind turbines
noise
annoyance
Opis:
A questionnaire inquiry on response to wind turbine noise was carried out on 361 subjects living in the vicinity of 8 wind farms. Current mental health status of respondents was assessed using Goldberg General Health Questionnaire GHQ-12. For areas where respondents lived, A-weighted sound pressure levels (SPLs) were calculated as the sum of the contributions from the wind power plants in the specific area. Generally, 33.0% of respondents were annoyed outdoors by wind turbine noise at the calculated A-weighted SPL of 31–50 dB, while indoors the noise was annoying to 21.3% of them. The propor- tion of subjects evaluating the noise produced by operative wind turbines as annoying decreased with increasing the distance from the nearest wind turbine (27.6% at the distance of 400–800 m vs 14.3% at the distance above 800 m, p < 0.016). On the other hand, the higher was the noise level, the greater was the percentage of annoyed respondents (14.0% at SPL up to 40 dB vs 28.1% at SPL of 40–45 dB, p < 0.016). Besides noise and distance categories, subjective factors, such as general attitude to wind turbines, sensitivity to landscape littering and current mental health status, were found to have significant impact on the perceived annoyance. About 50% of variance in annoyance rating might be explained by the aforesaid subjective factors.
Źródło:
Archives of Acoustics; 2014, 39, 1; 89-102
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of amplitude-based and phase-based method for speed tracking in application to wind turbines
Autorzy:
Urbanek, J.
Barszcz, T.
Sawalhi, N.
Randall, R. B.
Powiązania:
https://bibliotekanauki.pl/articles/220435.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed tracking
speed estimation
instantaneous frequency
wind turbines
Opis:
Focus of the vibration expert community shifts more and more towards diagnosing machines subjected to varying rotational speeds and loads. Such machines require order analysis for proper fault detection and identification. In many cases phase markers (tachometers, encoders, etc) are used to help performing the resampling of the vibration signals to remove the speed fluctuations and smearing from the spectrum (order tracking). However, not all machines have the facility to install speed tracking sensors, due to design or cost reasons, and the signal itself has to then be used to extract this information. This paper is focused on the problem of speed tracking in wind turbines, which represent typical situations for speed and load variation. The basic design of a wind turbine is presented. Two main types of speed control i.e. stall and pitch control are presented. The authors have investigated two methods of speed tracking, using information from the signal (without relying on a speed signal). One method is based on extracting a reference signal to use as a tachometer, while the other is phase-based (phase demodulation).Both methods are presented and applied to the vibration data from real wind turbines. The results are compared with each other and with the actual speed data.
Źródło:
Metrology and Measurement Systems; 2011, 18, 2; 295-303
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement of instantaneous shaft speed by advanced vibration signal processing-application to wind turbine gearbox
Autorzy:
Zimroz, R.
Urbanek, J.
Barszcz, T.
Bartelmus, W.
Millioz, F.
Martin, N.
Powiązania:
https://bibliotekanauki.pl/articles/220531.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
speed tracking
speed estimation
instantaneous frequency
spectrogram
wind turbines
Opis:
Condition monitoring of machines working under non-stationary operations is one of the most challenging problems in maintenance. A wind turbine is an example of such class of machines. One of effective approaches may be to identify operating conditions and investigate their influence on used diagnostic features. Commonly used methods based on measurement of electric current, rotational speed, power and other process variables require additional equipment (sensors, acquisition cards) and software. It is proposed to use advanced signal processing techniques for instantaneous shaft speed recovery from a vibration signal. It may be used instead of extra channels or in parallel as signal verification.
Źródło:
Metrology and Measurement Systems; 2011, 18, 4; 701-711
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The autonomic energy system of the residential building based on renewable energy sources
Autorzy:
Gomuła, S.
Stanisz, K.
Powiązania:
https://bibliotekanauki.pl/articles/175344.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
solar collectors
water heat accumulators
wind turbines
photovoltaic cells
photothermal absorbers
Opis:
The work presents the concept of a single-family building which is supplied only with the energy from local renewable energy source, the one which does not have a possibility of cooperation with the national energy system or with the local heat supply company. Only commonly occurring and available renewable energy resources are taken into account, that is solar radiation and kinetic energy obtained from wind, so technologies connected with burning were switched off, with the emission of carbon dioxide. Due to the stochastic nature of abundance of the materials, periodic production and accumulation are provided and, if necessary, the recovery of energy from batteries. There was a selection of devices performing the conversion of energetic resources into electricity and heat. Among those devices we can enumerate: wind turbines, photovoltaic cells and photothermal absorbers. In order to accumulate the heat, the water-battery was selected. It was thermally isolated from the surrounding. In order to accumulate electricity, the chemical battery was used. During the first part of the heating season, the building was heated on the basis of an exchange of heat between the heat accumulator and the building. In the second part of the heating season, for the purpose of heating, the heat pump was turned on. For this pump, the water-battery was the bottom heat source. During its work, the heat pump was powered by the chemical battery which accumulates electricity.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2015, 130; 109-123
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise Annoyance Caused by Amplitude Modulated Sounds Resembling the Main Characteristics of Temporal Wind Turbine Noise
Autorzy:
Hafke-Dys, H.
Preis, A.
Kaczmarek, T.
Biniakowski, A.
Kleka, P.
Powiązania:
https://bibliotekanauki.pl/articles/177437.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wind turbines amplitude modulation
noise annoyance
modulacja amplitudy turbin wiatrowych
uciążliwości hałasu
Opis:
Annoyance ratings for artificially created noises, resembling the main characteristics of temporal wind turbine noise, were studied by means of a listening experiment involving 21 participants with normal hearing. Three types of stimuli were examined: broadband noise (−4 dB/octave), noise generated by moving cars, and narrowband noise. All stimuli had the sound level fluctuations typical for wind turbine noise. The magnitude of the sound level fluctuations was measured in a quantitative way, by using the characteristics of amplitude modulated sound: modulation rate and modulation depth. Our aim was to examine how the modulation rate and the modulation depth influence the noise annoyance assessment of broadband and narrowband amplitude modulated noises. Three different modulation rates, 1, 2 and 4 Hz, and sound level fluctuations (a measure of the modulation depth), 3, 6, 9 dB, were applied to each type of stimuli (with exception of noise generated by the moving cars) and investigated. The participants in the listening experiment were presented with sound stimuli in laboratory conditions and asked to rate their annoyance on a numerical scale. The results have shown a significant difference between the investigated conditions. The effect was particularly strong between the annoyance judgments of different types of noise (narrow and broadband), and modulated versus unmodulated noises. Temporal fluctuations occurring in wind turbine noise are very pertinent to the perception of annoyance and could be responsible for its being a relatively annoying noise source. The obtained results were discussed and compared to the typical modulation rates and level changes that occur in recordings of real wind turbine noise.
Źródło:
Archives of Acoustics; 2016, 41, 2; 221-232
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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