一种基于硬件在环的可重构数控系统验证方法

Verification of Reconfigurable CNC System Based on Hardware-in-the-loop Simulation

作为一种开放式控制器,可重构数控(Computer numerical control,CNC)系统充分利用先进的控制技术、硬件产品等有利资源,提高系统功能的自适应性与快速响应能力。针对可重构CNC系统的验证过程复杂、硬件环境依赖性强等特点,采用硬件在环的设计方法,由仿真系统模拟数控机床的加工制造过程。给出面向可重构CNC系统的硬件在环仿真环境设计方法:采用现场总线连接数控系统与仿真环境,满足实时性、动态性等测试要求;建立机床驱动设备的仿真功能单元,完成数控加工指令的控制操作;实现数控机床的加工过程仿真,采用图形方式显示工件的切削成形过程。结合S曲线插补算法以及三轴数控铣床的仿真实例,对可重构CNC系统的加工控制过程进行测试,并且与实际加工样件进行对比分析,说明硬件在环技术在可重构CNC系统测试过程中的可行性与有效性。

As an open architecture controller,reconfigurable computer numerical control（CNC） system can fully utilize advanced control technologies,hardware devices and other innovations to increase self-adaptability and rapid responsiveness.Considering the verification complexity and hardware dependency of reconfigurable CNC system,hardware-in-the-loop simulation,in which machining process is simulated by computer software,is utilized as a key method to solve this dilemma.In order to fulfill real-time and dynamic testing requirements,field-bus technology is adopted as the communication interface for simulation system and reconfigurable CNC system.The simulation system substitutes driving devices of machine tool with software equivalent parts to execute control instructions,and it provides a graphic user interface to display and simulate the cutting and shaping process.Taking S-spline interpolation and three-axis milling machine as examples,the machining process of reconfigurable CNC system are evaluated in the designed system environment.Compared with the manufactured workpiece,hardware-in-the-loop simulation is convinced as a feasible and effective way for verifications of reconfigurable CNC system.