基于能量平衡原理的机床结构动态优化

Dynamic optimization of machine tool structure based on energy balance principle

提出了一种基于能量平衡原理的机床结构动态优化的方法,通过提高机床部件能量分布的均匀性来提高机床动态性能。以数控雕铣机龙门架的动态性能优化设计为例,对这一方法做了具体的阐述。首先,利用有限元软件模态分析确定出部件危险模态的固有频率及振型;然后,根据能量分布确定出动能和势能集中的区域,再根据能量平衡原理对零件结构进行优化;最后,使用标准差对能量分布的均匀性进行评价,最终达到提高机床部件动态特性的目的。

This paper presents a method of dynamic optimization of machine tool structure based on energy balance principle.The dynamic performance of machine tool is improved by improving the uniformity of energy distribution of machine tool parts.Taking the dynamic performance optimization design of gantry of CNC engraving and milling machine as an example,this method is expounded in detail.The paper firstly uses modal analysis in finite element analysis software to find the dangerous modal,secondly identifies the concentrated area of the kinetic energy and potential energy distribution,then optimizes the part structure on the principle of energy balance,finally evaluates the uniformity of energy distribution by standard deviation.The results prove that the dynamic performance of machine tool is improved by the better uniformity of energy distribution.