Shaking table tests for TLD vibration reduction control of offshore wind powerstructures under excitations with different spectral characteristics

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (9) : 66-76.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Shaking table tests for TLD vibration reduction control of offshore wind powerstructures under excitations with different spectral characteristics

TIAN Huiyuan1, LE Zhiji1, ZHANG Zhiqiang2, CHEN Li1, CAI Xiaoying1, LU Yijing*2

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Abstract

The support structure of offshore wind turbine is easy to be damaged under the environmental load. Taking the support structure of a 6.45MW offshore wind turbine as the prototype, a 1/15 scale model of the shaking table was designed, and then test the dynamic characteristics. Low order sinusoidal and low frequency Darfield waves are input at the bottom of the model, study the dynamic response of the tower structure under low frequency vibration load. A Tuned liquid damper (TLD) tank is set on the top of the model tower to test the characteristics of the damper. At the same time, the equivalent finite element model is established for numerical simulation of the same working condition. The results show that the vibration response of the tower shows a nonlinear amplification trend from the bottom to the top under low-order vibration excitation, and the distribution of the extreme value of the tower vibration response is similar to the first-order natural vibration mode of the structure. The vibration attenuation effect of the TLD is obvious under sinusoidal excitation, and the vibration amplitude decreases significantly. Under low terrace seismic wave, the response amplitude does not decrease obviously, but TLD increases the additional damping of structure. The equivalent finite element model is in good agreement with the experimental results, and the vibration characteristics of TLD can be effectively simulated by mass block and connector element.

Key words

offshore wind turbine / shaking table test / TLD / spectral characteristic / dynamic response

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TIAN Huiyuan1, LE Zhiji1, ZHANG Zhiqiang2, CHEN Li1, CAI Xiaoying1, LU Yijing2. Shaking table tests for TLD vibration reduction control of offshore wind powerstructures under excitations with different spectral characteristics[J]. Journal of Vibration and Shock, 2025, 44(9): 66-76

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