为了研究不同计算方法对颤振计算的影响,采用标准低压涡轮叶栅颤振模型——STCF4(standard test configuration 4)算例4中的628跨音速工况,分别用四种颤振计算方法(能量法、影响系数法、驻波模态法和单叶片模态法)进行全面计算和分析,...为了研究不同计算方法对颤振计算的影响,采用标准低压涡轮叶栅颤振模型——STCF4(standard test configuration 4)算例4中的628跨音速工况,分别用四种颤振计算方法(能量法、影响系数法、驻波模态法和单叶片模态法)进行全面计算和分析,为工程实践选取合适的颤振计算方法提供参考。阐述了涡轮叶栅中后行波比前行波更不稳定的原因,展现了叶片间相位角的形成过程,从而揭示了叶片间相位角对结构气动弹性稳定性具有关键性作用的原因。展开更多
In order to study the variation of machine tools’dynamic characteristics in the manufacturing space,a Kriging approximate model is proposed.Finite element method(FEM)is employed on the platform of ANSYS to establish ...In order to study the variation of machine tools’dynamic characteristics in the manufacturing space,a Kriging approximate model is proposed.Finite element method(FEM)is employed on the platform of ANSYS to establish finite element(FE)model with the dynamic characteristic of combined interface for a milling machine,which is newly designed for producing aero engine blades by a certain enterprise group in China.The stiffness and damping of combined interfaces are adjusted by using adaptive simulated annealing algorithm with the optimizing software of iSIGHT in the process of FE model update according to experimental modal analysis(EMA)results.The Kriging approximate model is established according to the finite element analysis results utilizing orthogonal design samples by taking into account of the range of configuration parameters.On the basis of the Kriging approximate model,the response surfaces between key response parameter and configuration parameters are obtained.The results indicate that configuration parameters have great effects on dynamic characteristics of machine tools,and the Kriging approximate model is an effective and rapid method for estimating dynamic characteristics of machine tools in the manufacturing space.展开更多
文摘为了研究不同计算方法对颤振计算的影响,采用标准低压涡轮叶栅颤振模型——STCF4(standard test configuration 4)算例4中的628跨音速工况,分别用四种颤振计算方法(能量法、影响系数法、驻波模态法和单叶片模态法)进行全面计算和分析,为工程实践选取合适的颤振计算方法提供参考。阐述了涡轮叶栅中后行波比前行波更不稳定的原因,展现了叶片间相位角的形成过程,从而揭示了叶片间相位角对结构气动弹性稳定性具有关键性作用的原因。
基金Project(2009ZX04001-073)supported by the Important National Science&Technology Specific Projects of ChinaProject(51105025)supported by the National Natural Science Foundation of China
文摘In order to study the variation of machine tools’dynamic characteristics in the manufacturing space,a Kriging approximate model is proposed.Finite element method(FEM)is employed on the platform of ANSYS to establish finite element(FE)model with the dynamic characteristic of combined interface for a milling machine,which is newly designed for producing aero engine blades by a certain enterprise group in China.The stiffness and damping of combined interfaces are adjusted by using adaptive simulated annealing algorithm with the optimizing software of iSIGHT in the process of FE model update according to experimental modal analysis(EMA)results.The Kriging approximate model is established according to the finite element analysis results utilizing orthogonal design samples by taking into account of the range of configuration parameters.On the basis of the Kriging approximate model,the response surfaces between key response parameter and configuration parameters are obtained.The results indicate that configuration parameters have great effects on dynamic characteristics of machine tools,and the Kriging approximate model is an effective and rapid method for estimating dynamic characteristics of machine tools in the manufacturing space.
