Abstract

This paper evaluates the application of a passive control technique with a tuned mass damper on platform for the barge-type offshore wind turbine. First of all, the three degrees of freedom mathematical model for the floating wind turbine is established based on Lagrange's equations, and the Levenberg-Marquardt algorithm is adopted to estimate the parameters of the wind turbine. Then, the method of frequency tuning which is utilized in engineering projects and genetic algorithm are employed respectively to simulate the optimum parameters of the tuned mass damper. The vibration mechanism about the phase-angle difference between tuned mass damper and floating platform is analyzed. Finally, the dynamic responses of floating wind turbine with/without tuned mass damper are calculated under five typical wind and wave load cases, and the vibration mitigation effects are researched in marine environment. Partial ballast is substituted by the equal mass of tuned mass damper due to the mass of floating platform with tuned mass damper would increase obviously, which would change the design of the wind turbine, and the vibration mitigation is also simulated in five typical load cases. The results show that the suppression rate of standard deviation of platform pitch is up to 47.95%, after substituting the partial mass of ballast, the suppression rate is 50%. Therefore, the dynamic responses of the barge-type floating wind turbine would be reduced significantly when the ballast is replaced by the equal mass of the tuned mass damper on floating platform.

Highlights

  • This paper evaluates the application of a passive control technique with a tuned mass damper on platform for the barge⁃type offshore wind turbine

  • The results show that the suppression rate of standard deviation of platform pitch is up to 47.95%, after substituting the partial mass of ballast, the suppression rate is 50%

  • 4) 当 TMD 的质量比为 19%时,用 TMD 等质量 替换风机部分压舱物,对浮动平台的减振效果可达 50%,因此在 Barge 浮动风机设计时,可以考虑尽量

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Summary

Introduction

关 键 词:海上浮动风机;浮动平台 TMD;参数优化;动态响应;振动抑制 中图分类号:O328; TK83 文献标志码:A 文章编号:1000⁃2758(2018)02⁃0238⁃08 1.1 海上风机动力学简化模型的建立 本文采用 Lagrange 方程建立 Barge 式海上浮动 Mt gRt ) θt dt θt îïïmTx T = ( - kTRT + mTg) θp - kTxT - dTRTθp - dTẋT

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