风浪联合作用下海上风电结构动力响应与MTMD减振控制

Dynamic Response of Offshore Wind Towers under Wind-wave Combined Effect and MTMD Vibration Control

针对海上单桩风机支撑结构在风浪荷载作用下的动力响应与减振设计开展研究。首先,建立某6.45 MW海上风电机组单桩集中质量-梁杆模型,利用Kaimal谱计算风荷载、Jonswap谱模拟波浪荷载,分析单桩风机结构的动力振动特性。随后,基于多重调谐质量阻尼器(Muti-Tuned Mass Damper,MTMD),设计1阶、2阶TMD,以结构振动响应为目标,研究该减振方案的适用性。研究表明,支撑结构的加速度、位移响应受塔架基频影响较大,且加速度受2阶基频主控,位移受1阶基频主控。当外荷载较大时,MTMD的减振效果会有所提高。MTMD体系的减振效果明显,各响应的减小率达到50%,且塔架的1阶、2阶频谱主峰值明显降低。

The dynamic response and vibration reduction design of single-pile offshore wind turbine(OWT)under wind-wave combined loads were studied.Firstly,a single pile centralized mass-beam model was established.Then,using the Kaimal spectrum to calculate the wind load and the Jonswap spectrum to simulate the wave load,the dynamic vibration characteristics of the OWT was analyzed.Based on the multi-tuned mass damper(MTMD),the applicability of the vibration reduction scheme was studied with the structural vibration response as the target.The research results show that the acceleration and displacement responses of the structure are greatly affected by the tower fundamental frequency,the acceleration is mainly controlled by the second order fundamental frequency,and the displacement is mainly controlled by the first order fundamental frequency.When the external load is large,the vibration reduction effect of MTMD will be raised.The MTMD system has obvious vibration reduction effect,the reduction rate of each response reaches 50%,the first and second order spectrum main peaks of the tower are significantly reduced.