基于开放式数控系统的数字化采集技术的研究

【作者】 黄鹤；

【导师】 王春；

【作者基本信息】 大连理工大学 ， 机械电子工程， 2002， 硕士

【摘要】 数字化采集技术是逆向工程中的一项关键技术，现有的数字化采集系统基本是基于DOS平台，在单机模式下开发出来的。这种数字化采集系统开放性差，开发周期长，人机交互不够友好。并且基本依赖进口，价格昂贵。针对这种情况，本文研究了基于开放式数控系统的数字化采集技术。 系统采用主从式双CPU结构。上位机选用研华工控机，下位机选用美国Delta Tau公司的多轴运动控制器PMAC。同时系统中扩展了DPRAM、伺服电机、A／D转换器、三维模拟仿形仪、I／O接口板。 下位机完成扫描跟踪控制、插补运算、位置控制、加减速控制、面板和机床状态的输入输出处理等实时性任务。同时将工件表面坐标实时写入DPRAM。 上位机通过调用PComm32动态连接库中的函数实现系统后台管理等非实时性任务，包括系统初始化、系统参数调整、坐标显示、机床操作控制等。采用WIN32下的多线程技术，结合多媒体定时器技术和双缓冲区存储技术，实时从DPRAM中采集机床坐标并存盘。解决了实时数据采集和海量数据存储任务。 论文进行过程中，作者进行了现场实验，成功地实现了工件表面的数字化采集，证明系统方案切实可行，具有实际应用价值。更多还原

【Abstract】 Digitizing collection is one of the key technologies of the reverse engineering. Nowadays, most of the Digitizing & Copying systems are based on DOS and single CPU. Those systems are of many disadvantages, such as poor flexibility, long period of developing, unfriendly manipulate interfaces and high price. Therefore the digitizing collection technology based on open CNC system is studied in this paper.Double CPUs architecture is used in this system. The host computer is Advantech IPC. The slave computer is PMAC. DPRAM, servo motors, A/D conversion board, 3D analogue probe, I/O board are chosen in this system.Most of the real-time tasks are controlled by PMAC, such as scanning, interpolation, position control, acceleration and deceleration, input & output, writing the sampled points to the DPRAM and so on.The background management, such as initialization, adjusting of parameter, display of motor position etc., are completed by the host computer through the functions of PMAC DLL PComm32, which is provided by Delta Tau Data System INC. Multithread multimedia timer and double buffer are used to read data from DPRAM. It solves the problems of real-time data gathering and huge amount of the sampled points storing.During this research, lots of experiments have been made in practice. Sampled points on different kinds of cured surface are gathered successfully. The feasibility of this project has been fully proved.更多还原