航空发动机支点刚度与整机变形分析方法

A method for evaluating bearing support stiffness and whole engine deformation

研究了如何利用整机有限元模型开展刚度及变形分析并给出量化要求,包括整机有限元建模、支点刚度计算及整机变形分析。整机有限元建模包括模型简化原则、编号规定、网格划分及模型检验。支点刚度计算包括支点刚度定义及刚度分配在设计过程中的应用。整机变形分析包括温度场与载荷施加、高低压转子轴间间隙分析、转静子轴向间隙分析关注要点和变形规律。经整机建模及计算分析,得出的支点刚度结果可为发动机轴承支承结构设计提供刚度分配指标,整机变形结果可用于发动机总体结构方案评估与优化。

A method for evaluating bearing support stiffness and whole engine deformation was explored,in-cluding whole engine modeling,supporting stiffness calculation and whole engine deformation.Whole en-gine modeling includes requirements on model simplification,numbering,meshing and model check.Bear-ing support stiffness calculation includes the stiffness definition and its allocation in bearing support struc-ture design process.In whole engine deformation part,the temperature mapping was introduced,the clear-ance between high/low pressure rotors and rotor/stator axial/radial clearance analysis were discussed.Sup-porting stiffness can beused for allocating stiffness requirement on bearing support structure design,and whole engine deformation can be used for engine overall structure arrangement assessment and optimization.