磨粒流精密加工中的测控系统研究

Research on the Measurement and Control System for Precision Process of Abrasive Flow

针对磨粒流具有变化无形和无孔不入的特点,研究了磨粒流精密加工中信号的测量、传输和控制。测控系统通过流量、压力和液位检测单元以及转速控制单元构成闭环控制系统。系统主控模块采用ARM嵌入式系统和RT-Linux实时操作系统,测控模块的通信采用RS-485总线架构及检验和校验码方式,控制单元利用模糊理论来控制水泵转速,实现湍流的稳定运行。该测控系统实现了任务的实时并行处理,通信可靠、额外开销少、泵速控制效果平滑,满足磨粒流精密加工的要求。

Abrasive flow features invisible variation and in all pervasive,in accordance with this situation,the measurement,transmission and control of the signal in precision process of the abrasive flow are researched.Through the detection of flow,pressure and level,as well as the rotating speed control unit,the measurement and closed-loop control system is structured.ARM embedded system and RT-Linux real-time operating system are adopted in main control module;RS-485 bus frame and checksum code are used for the communication of measurement and control module.By adopting fuzzy control theory,the rotating speed of the water pump is controlled by the control unit for implementing stable operation of the turbulent flow.This system accomplishes real-time parallel task processing,features reliable communication and less extra overhead.The rotating speed of pump is controlled smoothly to meet the requirement for precision process of the abrasive flow.