基于有限元结构动力学模型的塔架振动分析

摘要

为深入了解风机塔架的动态特性，并解决运行过程中的塔架振动问题，研究了塔架有限元动力学方程的建模方法，建立了塔架动力学方程；依据动力学方程，研究了塔架模态的求解方法，得到了塔架基础刚度、塔架质量及塔架刚度对塔架模态的影响趋势，为风机塔架制造、安装过程提供理论参考依据。并依据动力学方程，研究了塔架动力学相应的求解过程，进而设计了基于塔架激励减缓的多目标变桨控制方法，仿真和风场实验结果表明，此方法可有效减小塔架振动告警，减小风机停机次数，从而提高发电量。%In order to deeply understand the dy-namic characteristics of the wind turbine tower, and solve the problems during the operation of the vibration of the tower. Research on modeling method for tower finite element equations of dy-namics,established the tower dynamics equation;based on Dynamics equations,the method to calcu-late the modal of the tower,tower foundation stiff-ness,mass and stiffness of tower tower to tower modal tendency,to provide theoretical reference for the wind turbine tower manufacture,installation process.Based on the dynamic equation,the solu-tion procedure of tower dynamics accordingly,and then designed a variable pitch control method based on multi obj ective excitation slow tower, wind farm simulation and experimental results show that this method can effectively reduce the vibration of the tower alarm,reduce wind machine downtime,and improve power capacity.