摘要
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.
The axial moving vibration mode and the gyroscopic vibration mode were investigated by using the numerical simulation bases on the fluid-structure interaction analysis principles and the experimental study while the wind turbine was running. The trigger of the axial moving mode was the flexible of the tower, and the aerodynamic load and the centrifugal force had no effect on this vibration frequency. The trigger of the gyroscopic mode was because of the asymmetry pneumatic pressure of different leaf surfaces at the same time, the main reason for the changes of this vibration frequency was the circumferentiM force in the aerodynamic load, and the axial force had no effect on this vibration frequency, the centrifugal force had little effect on this vibration frequency and was approximately linear. The relevant research results may provide some new ideas and answers for the analysis of the fatigue damage accidents of many wind turbine blades in their running time which are much shorter than their design life, such as the damage and the fracture of the blade root, the severe wear of the transmission gear, the deformation of the main shaft of the generator.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第3期494-498,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.51346006)
内蒙古自然科学重大基金资助项目(No.2012ZD08)
内蒙古自然科学基金资助项目(No.2013MS0726)
内蒙古工业大学科学研究基金资助项目(No.X201218)
关键词
风轮
轴向窜动效应
陀螺效应
气动载荷
离心力
wind wheel
axial moving vibration mode
gyroscopic vibration mode
aerodynamic load
centrifugal force
