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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 feed pump turbine flexible support structure is related to the safe operation of the entire generator set. This paper first analyzes the mechanical boundary conditions of a 1000MW steam turbine flexible support structure of a company. Secondly, the flexible support structure is modeled according to the theory of material mechanics pressure bar stability, and the initial eccentric displacement Then, the nonlinear stability of the experimental structure was calculated by ANSYS 11.0 software. Finally, the experimental results were compared with the finite element method. The results show that the calculated load-displacement curves under different initial eccentric displacements agree well with the experimental results, and the critical loads of the flexible supporting structures decrease with the increase of initial eccentric displacements. Through the experiment of finite element method and finite element method, the finite element method of nonlinear stability of flexible support structure is validated, which provides strong support for the finite element calculation of the actual structure and the overall stability analysis of the feed water pump turbine.