Horizontal vibration characteristics of monopile wind turbine in radial softening layered soil

WANG Teng1, WANG Chan2

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 86-93.

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PDF(1454 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 86-93.

Horizontal vibration characteristics of monopile wind turbine in radial softening layered soil

  • WANG Teng1, WANG Chan2
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Abstract

Based on the multi-circle layer plane strain soil horizontal vibration model, the analytical solution to horizontal dynamic stiffness of radial softening soil around pile was obtained.Then, the horizontal vibration model of pile foundation in radial heterogeneous layered soil was established, and the dynamic stiffness matrix of pile top was obtained using the transfer matrix method.Furthermore, the equivalent fixed beam model was used to couple a pile-soil system into the wind turbine simulation software FAST 8 Effects of radial softening soil around pile on the horizontal dynamic response of monopile wind turbine under wind and wave loads were studied.The results showed that softening of soil around pile significantly affects dynamic stiffness of pile top; when the soil modulus attenuation coefficient is 0.25, horizontal stiffness of pile top decreases by 28.66% compared with that in case of homogeneous soil; with decrease in soil modulus attenuation coefficient, the first and second order natural frequencies of the wind turbine system decrease by 13.08% and 16.67%, respectively compared with those in case of homogeneous soil; when the soil modulus attenuation coefficient is 0.25, variances of wind turbine tower top’s displacement and rotation angle time histories have differences of 2.68% and 1.37%, respectively compared with those in case of homogeneous soil, while peak values of displacement and rotation angle response spectra are about 2.77 and 2.69 times, respectively of those in case of homogeneous soil.

Key words


radial softening
/ layered soil / monopile wind turbine / horizontal vibration / FAST software

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WANG Teng1, WANG Chan2. Horizontal vibration characteristics of monopile wind turbine in radial softening layered soil[J]. Journal of Vibration and Shock, 2021, 40(11): 86-93

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