Weber_Outsourcing_book_temp.qxd 02/03/2010 17:00 Page 61
Operational Modal Analysis for Assessing the Dynamic Behaviour of Wind Turbines
Figure 4: Spectral Characteristics (Singular Values of Spectral Density Matrices) of Recorded Time Series in the Lower Frequency Range
Enhanced frequency domain decomposition – peak picking
2 2
[dB I(1 m/s ) /Hz] Singular values of spectral density matrices of test set-up: recordings 2
0
Cursor Values
Frequency = 3.18Hz
SVD Line = 1
Estimation Parameters
f = 3.18±0.00000697Hz
-20
z = 0.478±0.00248%
MAC level = 0.88
Markers
Estimated mode
Selected mode
-40
Legend
SDOF Bell
SVD Line #1
SVD Line #2
SVD Line #3
SVD Line #4
-60
-80
-100
036912
Frequency (Hz)
Transparency and Efficiency
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