车铣复合机床立柱结构的多目标优化

Multi-Objective Optimization for Column Structure of Turn-Milling Complex Machine Tool

以车铣复合机床为研究对象,利用Solidworks建立三维模型,基于吉村允孝法计算出主要结合面参数,利用ANSYS Workbench建立整机的动力学模型,通过模态分析和谐响应分析确定立柱为影响整机动态性能的关键部件。以立柱的一阶固有频率、质量和静变形量为目标函数,以立柱两侧各筋板厚度为设计变量,利用响应面法对立柱进行多目标优化求解得出最优解集。最后对优化后的立柱进行分析验证,结果表明:立柱的质量减少了12.37%,整机验证显示各阶频率均有所提高,由优化前后谐响应分析得出最大响应峰值明显减小。该设计方法有效改善了整机的动态性能。

It takes turn-milling complex machine tool as the object of study in this paper.The3 D model of the whole machine are created by using Solidworks,and the dynamic characteristic parameters of the combined interfaces are got based on Masataka Yoshimura method.The dynamic model is built by using ANSYS Workbench. Modal analysis and harmonic response analysis illustrate that the column structure is the key part to affect the dynamic performance of the machine tool.A mathematical model was built by taking the first order modal frequencies,the mass and the effective static deformation of the column as the objective functions and the thickness of stiffener plates on both sides of column as the design variables,which determined the optimal set of size parameters are gotten by response surface methodology.Finite element analysis results demonstrate that the mass of the optimized column is reduced by 12.37%,the top 6 nature frequencies of the machine tool are increased with different degrees,and from harmonic response analysis results of the machine tool,the response amplitude has been appreciable decreased in every directions.The design method of this paper effectively improves the dynamic performance of the machine tool.