Comparative Analysis of Wind Speed Models Using Different Weibull Distributions

2019 ◽  
Vol 19 (1) ◽  
pp. 22-28
Author(s):  
Emrah Dokur ◽  
◽  
Salim Ceyhan ◽  
Mehmet Kurban ◽  
◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Wind Speed ◽  
Weibull Distributions

Comparative analysis of Russian and Norwegian precipitation gauges, measurements in Barentsburg, Western Spitsbergen

2017 ◽  
Vol 7 (1) ◽  
pp. 45-51
Author(s):  
Aleksandra V. Urazgildeeva ◽  
Pavel N. Sviashchennikov ◽  
Boris V. Ivanov ◽  
Ketil Isaksen ◽  
Eirik J. Frland ◽  
...  
Keyword(s):  
Time Series ◽  
Comparative Analysis ◽  
Wind Speed ◽  
Preliminary Results ◽  
Solid Precipitation ◽  
Parallel Measurement

Comparative analysis of records of two gauges with different wind shields (Tretyakov gauge and Geonor T200-B) were done, based on time series of parallel measurement in Barentsburg settlement, Svalbard, during two winter times in period from September 2014 to July 2016. All collected data of solid precipitation were divided into two ranges with different wind speed conditions. As it was known from earlier papers, Tretyakov gauge measurements tend to underestimate solid precipitation in case when precipitation is not intensive and wind speed is less than 5 m s-1. Opposite results were obtained for blizzard conditions (wind speed is more than 6 m s-1): Tretyakov gauge shows greater values for amount of solid precipitation than Norwegian sensor. Preliminary results in Barentsburg cannot be described as conclusive ones. Estimation of solid precipitation on Spitsbergen measured by different gauges needs further and more detailed research, which includes fieldwork in Barentsburg in spring, such as detailed snow surveys in the settlement.

Energy demand estimates in large Russian cities and its biometeorological characteristics

2020 ◽  
Author(s):  
Iya Belova ◽  
Liudmila Krivenok ◽  
Sergy Dokukin
Keyword(s):  
Energy Consumption ◽  
Comparative Analysis ◽  
Wind Speed ◽  
Ambient Temperature ◽  
Energy Demand ◽  
Public Spaces ◽  
Base Temperature ◽  
Comfort Zone ◽  
Russian Science ◽  
Temperature Range

<p>To estimate the energy amount needed to heat indoor living and public spaces, the heating degree day (HDD) parameter is applied. This is the most common climatic indicator of energy consumption for the building heating, which is calculated for a certain period of the year by summing the absolute deviations of the average daily ambient temperature from the selected base temperature. However, human biometeorological sensitivity is based not only on the ambient temperature, but on a combination of temperature, humidity, and wind speed.</p><p>We have conducted a comparative analysis of the climatic and biometeorological characteristics of the regions including the largest Russian cities. For the effective ambient temperature range of 17.2 to 21.7⁰C (comfort zone), we have calculated changes in the comfort zone for Moscow, St. Petersburg, Krasnodar, Novosibirsk, and Vladivostok according to data from 1959 to the present. Despite all climate differences between regions with selected cities, allowance for wind speed leads to a decrease in the number of days with temperature within the comfort zone.</p><p>This study supported by Russian Science Foundation (project No 16-17-00114).</p>

Equivalent P-v Model of Wind Farm Based on Measured Data

2014 ◽  
Vol 1070-1072 ◽  
pp. 233-237 ◽  
Author(s):  
Xiao Hai Wang ◽  
Xian Xian Pan ◽  
Jiang Wan ◽  
Jun Qi
Keyword(s):  
Comparative Analysis ◽  
Wind Speed ◽  
Wind Power ◽  
Wind Farm ◽  
Measured Data ◽  
Active Power ◽  
Traditional Model ◽  
Operating Data ◽  
Accurate Model

Accurate model of the wind farm is the basis for the analysis of wind power integrating grid. This paper proposed the equivalent P-v(active power-wind speed) model with K-means algorithm based on the measured operating data. An actual wind farm is adopted to verify the effectiveness of the model. The result of error comparative analysis shows that the accuracy of the model is greatly improved with the method proposed in this paper compared with the traditional model.

scholarly journals Detection and Quantization of Bearing Fault in Direct Drive Wind Turbine via Comparative Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Wei Teng ◽  
Rui Jiang ◽  
Xian Ding ◽  
Yibing Liu ◽  
Zhiyong Ma
Keyword(s):  
Wavelet Transform ◽  
Comparative Analysis ◽  
Wind Speed ◽  
Wind Turbine ◽  
Direct Drive ◽  
Complex Wavelet Transform ◽  
Heavy Load ◽  
Bearing Fault ◽  
Operation Conditions ◽  
Periodic Components

Bearing fault is usually buried by intensive noise because of the low speed and heavy load in direct drive wind turbine (DDWT). Furthermore, varying wind speed and alternating loads make it difficult to quantize bearing fault feature that indicates the degree of deterioration. This paper presents the application of multiscale enveloping spectrogram (MuSEnS) and cepstrum to detect and quantize bearing fault in DDWT. MuSEnS can manifest fault modulation information adaptively based on the capacity of complex wavelet transform, which enables the weak bearing fault in DDWT to be detected. Cepstrum can calculate the average interval of periodic components in frequency domain and is suitable for quantizing bearing fault feature under varying operation conditions due to the logarithm weight on the power spectrum. Through comparing a faulty DDWT with a normal one, the bearing fault feature is evidenced and the quantization index is calculated, which show a good application prospect for condition monitoring and fault diagnosis in real DDWT.

scholarly journals Effect of deflector curvature on hydrodynamic performances of a double-slotted cambered otter-board

2018 ◽  
Vol 38 ◽  
pp. 03049
Author(s):  
Lei WANG ◽  
Lu Min Wang ◽  
Jian Gao Shi ◽  
Wen Wen Yu ◽  
Guang Rui Qi ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Wind Speed ◽  
Reference Data ◽  
Center Of Pressure ◽  
Lift Coefficient ◽  
Pressure Coefficient ◽  
Moment Coefficient ◽  
Pitch Moment ◽  
Engineering Models ◽  
The Stability

The effect of deflector curvature on hydrodynamic performances of a double-slotted cambered otter-board was investigated using engineering models in a wind tunnel. Four different curvature (0.06,0.09, 0.12 and 0.15) were evaluated at a wind speed of 28 m/s. Parameters measured included: drag coefficient Cx, lift coefficient Cy, pitch moment coefficient Cm, center of pressure coefficient Cp , over a range of angle of attack (0° to 70°). These coefficients were used in analyzing the differences in the performance among the four otter-board models. Results showed that the maximum lift coefficient Cy of the otter-board model with the curvature (0.06) of two deflectors was highest (2.020 at °=55°). The maximum Cy/Cx of the otter-board with the curvature (0.12) of two deflectors was highest (3.655 at °=22.5°). A comparative analysis of Cm and Cp showed that the stability of otter-board model with the curvature (0.12) of two deflectors is better in pitch, and the stability of otter-board model with the curvature (0.06) of two deflectors is better in roll. The findings of this study can offer useful reference data for the structural optimization of otter-boards for trawling.

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