论文部分内容阅读
随着水轮机的单机容量愈来愈大,水轮机的振动也日益突出,而水轮机组轴系的振动特性更是直接关系到水轮机正常、稳定、高效运行。作者利用结构动力学、转子动力学和有限单元法,建立了发电机转子、轴系主轴、转轮及轴系整体的实体几何模型和有限元模型。计算了机组轴系在转轮质量偏心下的固有频率及振型。计算结果表明,转轮单个叶片密度改变引起的质量偏心对水力发电机组轴系自振特性影响不大,结构主要表现为扭转-摆动-弯曲的振动形态。
With the single capacity of turbines getting bigger and bigger, the vibration of turbines is also increasingly prominent. The vibration characteristics of turbines are directly related to the normal, stable and efficient operation of turbines. Using structural dynamics, rotor dynamics and finite element method, the authors established the solid geometric model and finite element model of the rotor, shaft, wheel and shaft of the generator. The natural frequencies and mode shapes of the shaft of the generator under eccentric eccentricity were calculated. The calculation results show that the mass eccentricity caused by the change of the single blade density of the runner has little effect on the natural vibration characteristics of the hydro-generator shaft system, and the structure mainly manifests as the torsional-oscillating-bending vibration.