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| First-order natural frequency of offshore wind turbines with large diameter single pile on spring foundation |
| Received:July 26, 2022 Revised:November 06, 2022 |
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| DOI：10.7511/jslx20220726001 |
| KeyWord:offshore wind turbine spring foundation fundamental frequency reverberation-ray matrix method monopile foundation |
| Author | Institution |
| 余云燕 |
兰州交通大学 土木工程学院, 兰州 |
| 许蓉 |
兰州交通大学 土木工程学院, 兰州 |
| 孔嘉乐 |
兰州交通大学 土木工程学院, 兰州 |
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| Abstract: |
| The fundamental frequency is one of the main difficulties in the preliminary dynamic design of offshore wind turbines,and the calculation accuracy is extremely high,while the pile-soil interaction has a significant impact on the fundamental frequency.At present,the simplified model of spring foundation is generally used for pile-soil interaction.In order to compare and analyze the accuracy of the simplified model of different spring foundations,this paper adopts the reverberation-ray matrix method to establish four simplified models:fixed-end,single-spring,double-spring and three-spring foundations.Based on Bernoulli-Euler beam theory and Timoshenko beam theory,the fundamental frequency of the wind turbine system is determined and compared with the measured values of the wind turbine fundamental frequency.The results show that: the pile-soil interaction is not negligible,and the three-spring simplified foundation model has the highest accuracy in calculating the fundamental frequency of the wind turbine system;the sensitivity of foundation stiffness to the fundamental frequency of the wind turbine system is in the order of: foundation coupling stiffness＞foundation rotational stiffness＞foundation horizontal stiffness;when the foundation rotational (horizontal) stiffness is small,the effect of foundation coupling stiffness and foundation rotational (horizontal) stiffness has a greater influence on the fundamental frequency of the wind turbine system.The effect of foundation coupling stiffness and foundation rotational stiffness has a greater influence on the fundamental frequency of the wind turbine system than the effect of foundation coupling stiffness and foundation horizontal stiffness. |
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