基于混沌理论的超大型漂浮式风力机动态响应研究

RESEARCH ON DYNAMIC RESPONSE OF SUPER LARGE FLOATING WIND TURBINE BASED ON CHAOS THEORY

大型化后的漂浮式风力机非线性运动特征显著增强,为此以DTU 10 MW风力机为研究对象,建立NAUTILUS半潜式平台漂浮式风力机模型,在机舱内部配置调谐质量阻尼器(TMD),通过多岛遗传算法优化TMD参数,研究无TMD控制、TMD控制(未优化)及优化TMD控制下漂浮式风力机运动响应特性,并基于混沌理论,采用相空间重构和最大Lyapunov指数法从定性和定量角度分析漂浮式风力机运动响应非线性特征。结果表明:TMD控制和优化TMD控制下,漂浮式风力机塔顶前后位移响应明显减小,但侧向位移响应作用较小;塔架前后加速度响应峰值在塔架高度为30 m~90 m范围内显著减小,而侧向加速度响应峰值则在塔架高度为10 m~30 m范围内有所减小。较之无TMD控制,优化TMD控制下,漂浮式风力机运动响应混沌特征减弱,最大Lyapunov指数均减小,表明优化TMD可减小其运动响应非线性特征。

The non-linear motion characteristics of the large-scale floating wind turbine have been significantly enhanced.For this reason,the DTU 10 MW wind turbine was used as the research object,and the NAUTILUS semi-submersible platform floating wind turbine model was established,and the tuned mass damper(TMD)was installed in the nacelle Optimize TMD parameters through multi-island genetic algorithm,study the motion response characteristics of floating wind turbines without TMD control,TMD control(unoptimized)and optimized TMD control,and based on chaos theory,adopt phase space reconstruction and maximum Lyapunov exponent method from qualitative and quantitative analysis of the nonlinear characteristics of floating wind turbine motion response.The results show that under TMD control and optimized TMD control,the forward to after displacement response of the floating wind turbine tower top is significantly reduced,but the side to side displacement response is relatively small;the peak forward to after acceleration response of the tower is significantly reduced in the range of 30 m~90 m.The peak value of side to side acceleration response decreases in the range of 10 m~30 m.Compared with the non-TMD control,under the optimized TMD control,the chaotic characteristics of the floating wind turbine’s motion response are weakened,and the maximum Lyapunov exponents are all reduced,indicating that the optimized TMD can reduce the nonlinear characteristics of its motion response.