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Technical Brief

Wind Speed Dependency of Low-Frequency Vibration Levels in Full-Scale Wind Turbines

[+] Author and Article Information
Xavier Escaler

Department of Fluid Mechanics,
Universitat Politècnica de Catalunya,
Av. Diagonal 647,
Barcelona 08028, Spain
e-mail: escaler@mf.upc.edu

Toufik Mebarki

Schaeffler Iberia S.L.U.,
Foment 2,
Sant Just Desvern 08960, Spain
e-mail: toufik.mebarki@schaeffler.com

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 4, 2014; final manuscript received September 15, 2015; published online October 15, 2015. Assoc. Editor: Yves Gagnon.

J. Sol. Energy Eng 137(6), 064505 (Oct 15, 2015) (5 pages) Paper No: SOL-14-1110; doi: 10.1115/1.4031633 History: Received April 04, 2014; Revised September 15, 2015

A series of continuous vibration measurements in 14 upwind wind turbines of the same model and belonging to the same wind farm have been conducted. The data were acquired over a period lasting approximately half a year. The tower axial vibration acceleration has been monitored in the frequency band from 0 to 10 Hz with an accelerometer mounted on the gearbox casing between the intermediate and the high-speed shafts. It has been observed that the average frequency spectrum is dominated by the blade passing frequency in all the wind turbines. The evolution of the vibration magnitudes over the entire range of operating conditions is also very similar for all the wind turbines. The root-mean-square (rms) acceleration value has been correlated with the wind speed, and it has been found that a linear fit with a positive slope is a useful model for prediction purposes.

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Figures

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Fig. 1

Photograph of the accelerometer mounted in axial direction on the gearbox casing

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Fig. 2

Average wind speed measured on four wind turbines during 19 days of operation

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Fig. 3

(Left panel): power outputs as a function of wind speed for unit T2. (Right panel): averaged power curves versus wind speed for all the wind turbines (continuous lines) and a comparison with limiting theoretical calculations (dotted and dashed lines).

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Fig. 4

(Left panel): interpolated data points and lines corresponding to the 5% (upper) and 95% (lower) percentiles for unit T2. (Right panel): preserved data after removing the outliers for unit T2.

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Fig. 5

(Top panel): vibration signal on unit T1 rotating at a frequency of approximately 0.184 Hz. (Bottom panel): averaged normalized frequency spectrum for four units in terms of multiples of the main rotor rotational frequency.

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Fig. 6

Correlation of the rms values of acceleration in the band from 0 to 10 Hz and the wind speed for four units with the same gearbox

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Fig. 7

Linear functions modeling the rms values of acceleration in the band from 0 to 10 Hz as a function of the wind speed for all the units

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