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为建立更加准确的航空发动机高压转子的有限元模型,对表征高压转子拉杆结构中盘与盘之间接触的力学模型进行研究,引入包含库伦摩擦力的非线性弹塑性滑动模型对该类接触进行描述。提出弹簧刚度矩阵和有限元模型整体刚度矩阵的融合修正方法,建立了有限元刚度的整体优化模型。运用拉直算子将模型中需要修正的参数分离出来,结合实验模态参数对有限元模型刚度进行了修正。以实际航空发动机高压转子为例,通过与线性模型的修正结果比较,证明该模型准确描述了拉杆结构的复杂接触,且融合算法是可行且有效的。
In order to establish a more accurate finite element model of high-pressure rotor of aeroengine, the mechanical model that characterizes the contact between disk and disk in high-voltage rotor rod structure is studied. A nonlinear elastic-plastic sliding model involving Coulomb friction is introduced to make such contact description. The fusion correction method of the spring stiffness matrix and the integral stiffness matrix of the finite element model is proposed, and the overall optimization model of the finite element stiffness is established. The straightening operator is used to separate the parameters that need to be corrected in the model, and the stiffness of the finite element model is modified with the experimental modal parameters. Taking the high-pressure rotor of actual aeroengine as an example, the model is proved to be accurate to describe the complex contact of the tie rod structure by comparison with the linear model. The fusion algorithm is feasible and effective.