摘要
以国产600MW汽轮机末级1029mm叶片为研究对象,分析汽轮机叶片的动力特性。首先,建立汽轮机叶片的实体模型和有限元模型。以结构动力学和刚体动力学基本方程为理论基础,将叶片简化根部完全固定的悬臂梁结构。通过大型有限元软件ANSYS Workbench计算出末级叶片在静止状态和不同转速下的前6阶模态频率和振型,得出模态频率随转速的变化曲线。同时,对叶片进行频率响应分析,得到了激振力作用下叶片的振动位移和应力分布。
This paper took 600MW domestic steam turbine last stage 1029mm blades as the research object, the dynamic characteristic of steam turbine is analyzed. First, the solid model and finite element model of steam turbine blades are established. According to the theoretical basis based on the fundamental equation of structural dynamics and rigid body dynamics, the blades were treated as a free suspended beam which was entirely fixed on the root. With the aid of finite element analysis software ANSYS Workbench, the first six natural frequencies and vibration models of last stage blades were calculated under stationary station and different rotational speeds, the curve of modal frequency-rotational speeds was obtained. And then frequency response for the blade were analyzed, the vibrant magnitude and stress distribution of the blades under the exciting force were obtained.
出处
《沈阳理工大学学报》
CAS
2013年第1期46-50,共5页
Journal of Shenyang Ligong University
关键词
叶片
有限元分析
模态频率
动力特性
频率响应
blade
finite element analysis
modal frequency
dynamic characteristic
frequency response
