基于有限元法的转子细观结构对宏观刚度的影响

基于有限元法,通过研究转子内部细观结构非线性环节对宏观系统动力学参数影响的规律,构建了降维映射函数的研究思路.针对某型航空发动机轮盘拉杆螺栓接触结构,通过适当简化转子模型,利用ANSYS软件分析轮盘不同偏心状况下,拉杆螺栓不同预紧状态对宏观刚度的影响,探究其刚度非线性特性.结果表明:螺栓均匀预紧,预紧力变化,转子系统非线性特征的变化趋势与偏心夹角有关;半数螺栓松动,偏心夹角越大、松动预紧力越小,非线性特征越明显.

Influence on macroscopic stiffness of rotor mesostructure based on finite element method

A research thought of establishing the mapping function based on the rules of dynamics parameters of macroscopic system due to the non-linear behavior of mesostructure for rotor system was put forward which based on finite element method, and then the dimensions of rotor systems were reduced legitimately. By simplifying the rotor model of contact structure of rod bolt in a type of engine disk appropriately, the effects of inhomogeneous rod bolt preload on the rotor macroscopic stiffness under different eccentric states of disks were analysed with ANSYS, nonlinear characteristics of stiffness were obtained.Results show that, when the bolts are evenly preloaded, along with the change of preload forces,the variation trend of nonlinear characteristics is related to the eccentric angle alteration; when half of the bolts are loose, the eccentric angle is larger while the loose preload forces are smaller, and the nonlinear characteristics are more obvious.