Dynamic characteristic analysis of whole machine tools based on Kriging model

GAO Xiang-sheng(高相胜)^{1, 2}, ZHANG Yi-du(张以都)^{1, 2}, GAO Hao-dong(郜浩冬)^{1, 2}, ZHANG Hong-wei(张洪伟)³

(1. State Key Laboratory of Virtual Reality Technology and Systems (Beihang University), Beijing 100191, China;
2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China;
3. School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China)

Abstract: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.

Key words:machine tool; dynamic characteristic; interface; configuration; Kriging model