摘要
负载惯量比是数控机床进给系统性能分析与设计的重要内容,数控机床的高速化、高精度化发展使得负载惯量比的优化选择问题更加突出。这要求设计者能够系统地分析负载惯量比与系统性能之间的相互关系,并为之提供负载惯量比的精确有效的设计方法。采用双惯量机械系统模型,通过解析分析与数值试验相结合的方法,分析负载惯量比与能量匹配效率的关系;分析了半闭环与全闭环两种控制结构下负载惯量比与控制增益上限、闭环频率特性以及抗干扰动刚度的关系;并在此基础上给出了数控机床进给系统负载惯量比的设计步骤与方法。为数控机床的设计者提供一种在多因素作用下设计最优负载惯量比的方法,具有理论和实际的工程价值。
The load inertia ratio is important for performance analysis and design of computer numerical control （CNC） machine tools feed drive system.Under the high-speed and high-precision trends of machine tool,the optimization of the load inertia raitio become crucial.The systematic analysis of the relationship between the load inertia ratio and performance of its feed drive system is necessary,and a precise design method for inertia ratio is asked for.Using double mass mechanical model,an approach combined analytic and numerical simulation is presented.The relationship between inertia ratio and energy matching efficiency,relationship between inertia ratio and controller gain,and closed loop frequency characteristic,anti-disturbance dynamic stiffness under semi-closed and fully-closed loop control structures are analyzed respectively.Based on these analyses,a brief description of design approach is given.For CNC machine tool designer,methods to choose the optimal load inertia ratio based on specific performance requirements under multi-factors are formed,which bare theoretical and practical engineering values.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2014年第9期108-113,共6页
Journal of Mechanical Engineering
基金
国家自然科学基金重点资助项目(51235009)
关键词
数控机床
进给系统
负载惯量比
控制增益上限
抗干扰刚度
CNC machine tools
feed drive system
load inertia ratio
controller gain limit
anti-disturbance dynamic stiffness
