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针对风轮的轴向窜动效应和陀螺效应振动特性,采用流固耦合分析原理进行模态数值模拟及风力机实际运行状态下的试验验证.结论发现:轴向窜动效应振动的触发源于塔架弹性,气动载荷和离心力对该类振动频率的变化基本没有影响;陀螺效应振动的触发源于同一时刻不同叶片表面气动压力的不对称,气动载荷中的周向力是导致该类振动频率发生变化的主要原因,轴向力则对其振动频率的变化没有影响,离心力对该类振动频率的变化影响不大,且近似成线性.相关研究成果,可能为很多风力机在远短于设计寿命期内频繁发生叶根损伤和断裂、变速箱齿轮严重磨损、发电机主轴变形等一些困扰学界的问题提供新的分析思路和答案.
According to the axial and gyroscopic vibration characteristics of the wind turbine, the numerical simulation of the modal flow and the experimental verification under the actual operating condition of the wind turbine are carried out by using the principle of fluid-solid coupling analysis.The conclusion is found that the triggering of axial vibration The elasticity of the tower, the aerodynamic load and the centrifugal force have almost no effect on the variation of the vibration frequency. The gyroscopic vibration is triggered by the asymmetry of the aerodynamic pressure on different blade surfaces at the same time. The circumferential force in the aerodynamic load changes the vibration frequency , The axial force has no effect on the change of its vibration frequency, and the centrifugal force has little effect on the change of such vibration frequency, and it is approximately linear.The related research results may be that many wind turbines are far behind the design life-span Frequent occurrence of leaf root damage and fracture, gearbox serious wear and tear, the generator spindle deformation and some other issues that plague the academic community to provide new analytical ideas and answers.