中空夹层钢管混凝土风力机塔架风振性能研究

传统风力发电机组塔架大多为锥形单管钢薄壁细长结构,此类结构在叶片转动及风荷载作用下易发生大的变形和振动。为克服传统风电塔自身发展的局限性并发挥中空夹层钢管混凝土(CFDST)结构优良的力学性能,基于某锥形钢塔筒,通过承载力等效提出CFDST塔筒结构形式,利用ABAQUS软件建立其风振性能有限元模型,对比了两种塔筒的振动模态。从时域和频域对二者在不同荷载工况下的动力响应特征进行对比分析,并对塔筒与叶片是否共振及瞬态冲击荷载下的振动进行了研究。结果表明:CFDST塔筒在保证原有钢塔筒抗弯承载力和刚度的同时,底部截面尺寸减小了25.6%,且不会与叶轮转动产生的谐波激励发生共振; 阻尼对风机塔筒位移、速度、加速度及应力响应幅值影响显著; 与钢塔筒相比,CFDST塔筒在正常运行荷载工况下峰值位移、加速度幅值和最大等效应力分别降低21.1%、30.2%和41.6%,而在暴风荷载工况下,分别减小14.4%、32.2%和36.3%; 研究成果可为相关塔筒的设计优化提供参考。

Study on wind vibration performance of concrete-filled double skin steel tubular wind turbine tower

The conical single tube steel thin-walled slender structure is usually adopted in traditional wind turbine towers, which is prone to large deformation and vibration under the blade rotation and wind loads. In order to overcome the development limitations of the traditional steel towers and utilize the excellent mechanical properties of the concrete-filled double skin steel tube(CFDST)structure, a CFDST tower structure based on a certain conical steel tower tube was designed through the bearing capacity equivalence. Using ABAQUS software, the finite element models of the wind-induced vibration performance of the two towers were established and the vibration modes were compared. The dynamic response characteristics of the two towers under different load conditions were compared and analyzed in the time domain and frequency domain, and the vibrations of the tower and blades under transient impact load were also studied. The results show that the CFDST tower can reduce the bottom section size by 25.6% while ensuring the bending capacity and stiffness of the original steel tower tube and will not resonate with the harmonic excitation generated by the rotation of the blades. Damping has a significant impact on displacement, velocity, acceleration, and stress response amplitudes of the wind turbine tower. Compared with the steel tower, the peak displacement, acceleration amplitude and maximum equivalent stress of the CFDST tower under normal operating load conditions are reduced by 21.1%, 30.2% and 41.6%, while decreased by 14.4%, 32.2% and 36.3% under storm load condition. The research findings can provide references for the design and optimization of relevant CFDST towers.