摘要
给水泵汽轮机挠性支承结构的稳定性关系着整个发电机组的安全运行。该文首先分析了某公司1000MW等级给水泵汽轮机挠性支承结构的力学边界条件;其次,根据材料力学压杆稳定性理论对挠性支承结构进行模化,并设计了模化结构具有初始偏心位移的稳定性实验;然后,利用三维有限元软件ANSYS 11.0对实验结构进行了非线性稳定性计算;最后,将实验结果和有限元计算进行比较。结果表明:计算所得的不同初始偏心位移下的载荷-位移曲线与实验结果基本吻合,挠性支承结构的临界载荷随着初始偏心位移的增大而减小。通过模化结构的实验与有限元计算,验证了挠性支承结构非线性稳定性的有限元计算方法,为实际结构的有限元计算和给水泵汽轮机整体稳定性分析提供了有力支撑。
The stability of the flexible support of boiler feed pump turbine（BFPT） is related to the safety of power generation units.First,the mechanical boundary conditions of the flexible support were performed.Then,based on the stability theory,the flexible support was modeled according to the experimental conditions.The stability experiment of a modeled structure was carried out,in which the different eccentric displacements were concerned.In addition,three-dimensional finite element software ANSYS 11.0 was adopted to investigate the nonlinear stability of the modeled structure.Finally,the numerical results were compared with the experimental results,and the load-displacement curves from numerical results are in good agreement with that from the experimental results.It is revealed that the critical load of the modeled structure decreases with the increase of displacement eccentricity.The validity of the method used to analyze the nonlinear stability of the flexible support is verified by the numerical simulation and experimental validation on a modeled structure,thus provides the basis of researching the stability of the actual flexible support structures and the stability of BFPT.
出处
《工程力学》
EI
CSCD
北大核心
2013年第4期410-416,共7页
Engineering Mechanics
基金
国家科技部863项目(2008AA05A302)
关键词
动力机械及工程
给水泵汽轮机
挠性支承
稳定性分析
临界载荷
偏心位移
非线性有限元
power machinery and engineering
boiler feed pump turbine
flexible support structure
stability analysis
critical load
eccentric shifting
nonlinear finite element analysis
