风、冰荷载联合作用下的海上单桩风机结构TMD减振控制模拟

Simulation of TMD vibration control for offshore monopile wind turbine structures under combined wind and ice loads

寒冷地区海上风机结构受到复杂环境荷载作用,易出现振动安全性问题。文章以某6.45 MW海上单桩风机结构为例,施加风、冰荷载联合作用,对比分析多重调谐质量阻尼器(MTMD)系统减振前后的结构振动响应。结果表明:风、冰荷载会引起风机塔架的剧烈振动响应,最大位移响应出现在风机塔顶,最大加速度响应出现在结构二阶振型幅值点附近;除了前两阶频率,风、冰荷载还会激起塔架结构的更高阶响应;同时控制结构一二阶频率的MTMD方案可有效控制塔架位移、加速度和倾覆力矩响应,减振效果明显,但调谐质量阻尼器(TMD)装置存在频率敏感性,无法控制更高阶频率引起的结构振动响应。

In cold regions,offshore wind turbine structures are susceptible to complex environmental loads,which can lead to vibration-related safety concerns.Taking a 6.45 MW offshore monopile wind turbine structure as an example,the vibration response of the structure under the combined action of wind and ice loads is analyzed and compared before and after the implementation of the MTMD(Multiple Tuned Mass Damper)system.The results indicate that the wind and ice loads induce severe vibration responses in the wind turbine tower,with the maximum displacement response occurring at the top of the tower and the maximum acceleration response near the amplitude point of the second mode of vibration.In addition to the first two natural frequencies,the wind and ice loads also excite higher-order responses in the tower structure.By employing an MTMD system that controls the first and second mode frequencies,the displacement,acceleration,and overturning moment responses of the tower structure can be effectively controlled,resulting in significant vibration reduction.However,it should be noted that the TMD(Tuned Mass Damper)device exhibits frequency sensitivity and cannot effectively mitigate vibration responses induced by higher-order frequencies of the structure.