基于子结构阻抗匹配与优化拟合的高精度磨床整机动力学建模研究

Dynamics Modeling Research of a High Precision Grinder Based on Sub-structure Impedance Match and Optimization Fitting Method

基于分布质量 Riccati传递矩阵法和有限元法 ,分析了高精度内圆磨床的自由转子和由床身、工作台等部件所组成的基础的动态性能。根据阻抗匹配原理 ,建立了由转子—轴承—基础所组成的整机动力学模型。通过整台机床的试验模态分析 ,采用参数优化拟合修正动力学模型 ,并计算出滚动轴承刚度 ,为整机动态性能分析优化奠定基础。

Dynamic behavior of the free rotors and the foundation composed of the bed and the worktable, etc is analyzed by continuous mass Riccati transfer matrix method and finite element method.According to the impedance match principle,dynamics model of the whole machine composed of rotor--bearing--foundation is built. The roll bearings stiffness is obtained by the whole machine modal testing and the dynamics model updating with modal parameter optimization fitting method, which is used to establish the basis of optimizing the whole machine dynamic behavior.