多轴联动龙门式加工中心整机动力学研究  

Dynamic Study of Multi-axis Synchronous Gantry Machining Center Whole Machine

作　　者：佀国宁[1] 杨建新[1] 余跃庆[1] 

机构地区：[1]北京工业大学机电学院,北京100124

出　　处：《组合机床与自动化加工技术》2009年第11期17-20,共4页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家科技支撑计划资助项目(2007BAF21B01);北京工业大学大学博士创新基金资助项目(bcx-2009-005)

摘　　要：采用有限元软件SAMCEF Mecano,建立了多轴联动龙门式加工中心整机的柔性体动力学模型,通过隐式算法和基于Newmark改进的HHT迭代算法对其进行了动力学求解,分析了其运动误差、速度的变化规律。通过与刚性体模型误差结果的对比,得出了柔性体的弹性变形对运动误差的影响,同时通过速度仿真曲线和理论曲线比较,验证了该动力学模型的正确性。分析结果表明,系统的运动误差和速度变化规律与加工中心本身的固有振动特性、驱动马达和加工中心的非线性因素密切相关。这为进一步研究加工中心的动态性能提供了重要的理论依据。The flexible dynamic model of a multi-axis synchronous gantry machining center main structure is adopted with a finite element analysis software SAMCEF Mecano. The dynamic solution was carried with implicit Non linear method and HHT recurrence algorithm based on modified Newmark algorithm. The kinematic error and velocity were analyzed. The influence of elastic deformation with kinematic error was developed contrast between flexible body and rigid body. The dynamic model was proved effective comparison between simulation curves and theory curves. The analysis results show that the kinematic error and the variation of velocities are connected with natural vibration characteristic, driving motor and nonlinear characteristics of machining center. The results provide necessary information for the dynamic characteristics of machining center.

关 键 词：龙门式加工中心 动力学模型 有限元 动力学分析 

分 类 号：TH122[机械工程—机械设计及理论]