基于有限元分析的数控机床床身结构动态优化设计方法研究

运用结构动态设计原理和有限元法(finite element method)的变量化分析技术，提出一种数控机床床身结构的动态设计方法和流程。结构的固有频率越高，其动、静刚度越好。以一立式加工中心床身为例，先提取床身的典型元结构和框架结构对其进行优化，在此基础上以床身结构固有频率为优化目标，以元结构和框架结构优化结果为依据，提出该床身结构若干改进方案，并对各方案进行比较分析。文中提出的方法可推广到其他结构的动态设计中。

RESEARCH ON STRUCTURAL OPTIMIZATION METHOD IN DESIGN OF NC MACHINE TOOL BED BASED ON DYNAMIC ANALYSIS BY FEM

A design method and it's process of bed structure of NC(numerical control) machine tool are proposed based on dynamic design principle and variational analysis technology by finite element method (FEM). The higher is natural frequency of structure, the better are static and dynamic structural stiffness. With bed of vertical machine center (MC) as an example, typical unit structures (US) and base frame of lathe bed are picked up and optimized. Then, several improved bed schemes are presented and analyzed by comparison using natural frequency of structure as target and depending on optimized results of unit structures and base frame. The method can be applied to dynamic design of other structures.