大型汽轮发电机组轴系振型识别方法研究

THE RESEARCH OF THE VIBRATION SHAPE IDENTIFICATION METHOD FOR LARGE TURBO GENERATOR UNITS

目前人们可以方便地获取汽轮发电机组轴承振动信号 ,但是对于轴系内部各点振动情况却知之甚少。本文运用模态分析理论建立了转子 -轴承系统轴系振型识别模型。该模型考虑了轴承等部件存在的各项异性、不同振动方向之间的耦合以及轴承座刚性等因素的影响 ,识别过程无需迭代求解。本文以转子试验台、连续转子和一大型汽轮发电机组为例详细分析了不同转速和不平衡分布下的识别结果。论文最后对本方法的误差进行了分析 ,以期提高本方法的实用性。

Vibration of turbo generator unit near bearings can be easily obtained. But the vibration inside the rotor is unknown. By using modal analysis theory, the prediction method based on the fusion of structural and vibration data is set up in the paper. Bearing support system dynamics, bearing asymmetry characteristics and coupling between two vibration directions are considered. A test rig, a continuous rotor system and a large turbo generator unit are used to analysis the identification results under different exciting force distribution and rotating speeds. Error analysis is given in the end of the paper for further research.