Design of digital twin-based control system for loading and unloading of proton beam irradiated thorium target
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摘要: 针对质子束辐照钍靶装卸系统在低辐射、大尺度、高复杂性等操作环境下,传统的单机控制故障率高、维护难、灵活性差、人工操作危险的问题,提出了一种基于可编程逻辑控制器(PLC)冗余的数字孪生质子束辐照钍靶装卸系统控制方法。首先,该方法采用CPU冗余、I/O冗余、电源冗余等多要素协调控制策略,通过对硬件热备冗余系统的搭建和软件冗余系统的组态、编程及仿真,使控制系统不间断运行。其次,基于“NX MCD+PLC SIM+OPC”架构设计了数字孪生虚实交互的控制系统,对物理空间的数据信息在虚拟空间构建靶片装卸系统孪生模型,实现辐射环境下无人值守的连续监控;最后,经过实验与可靠性分析,所提方法使此控制系统的稳定性提升至99%,为辐照环境下操作系统的管控提供了一种新思路。Abstract: Aiming at the problems of high failure rate, difficult maintenance, poor flexibility, and dangerous manual operation of the traditional stand-alone control of the proton beam irradiation thorium target loading and unloading system under the operating environment of low radiation, large scale, and high complexity, a control method of digital twin proton beam irradiation thorium target loading and unloading system based on the redundancy of Programmable Logic Controller (PLC) is proposed. Firstly, the method adopts a multifactor coordinated control strategy such as CPU redundancy, I/O redundancy, and power supply redundancy, and enables the control system to run uninterruptedly by constructing a hardware hot-standby redundancy system and organizing, programming, and simulating a software redundancy system. Secondly, based on the architecture of “NX MCD+PLC SIM+OPC”, the control system of digital twin virtual-reality interaction is designed, and the twin model of target loading/unloading system is constructed in the virtual space for the data information in the physical space, so as to realize the unattended and continuous monitoring in the radiation environment. Finally, experiments and reliability analysis, prove that the proposed method improves the stability of this control system to 99%, which provides a new idea for the control of operating system under irradiation environment.
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Key words:
- PLC redundancy /
- digital twin /
- virtual reality interaction /
- reliability
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表 1 冗余系统组件表
Table 1. Redundant system components
installation quantity installation quantity R/H CPU 2 CP modules as required duplex fiber optic cable 2 with power floor 2 ring bus (computing) 2 switch (telecommunications) 2 I/O modules(ET200) 2 photoelectric converter 4 load current power supply 2 fiber several 表 2 实验参数设置
Table 2. Experimental parameter settings
factor level factor level tempo 0~10 m/s maximum runtime 1 h air pump working pressure 0.4~0.5 MPa payload limit 0~100 g sampling interval 5 s operating temperature 0~30 ℃ input voltage AC(220 V(1±10%)) operating humidity 40%~70% frequency 50 Hz operating noise 0~70 dB 表 3 机电一体化单机设备及冗余设备可靠度
Table 3. Reliability of mechatronic stand-alone and redundant equipment
equipment stand-alone reliability code redundancy reliability code computer workstation 0.95 $ R_{\rm{c}}^{} $ 0.988 $ R_{\rm{c}}' $ network switch 0.98 $ R_{\rm{n}}^{} $ 0.999 $ R_{\rm{n}}' $ ethernet communication module 0.96 $ R_{\rm{e}}^{} $ 0.999 $ R_{\rm{e}}' $ CPU 0.98 $ R_{\rm{CPU}} $ 0.999 $ R_{\rm{CPU}}' $ DP communication module 0.96 $ R_{\rm{DP}} $ 0.999 $ R_{\rm{DP}}' $ photoelectric conversion module 0.98 $ R_{\rm{p}}^{} $ 0.999 $ R_{\rm{p}}' $ I/O module 0.97 $ R_{{\rm{I}}/{\rm{O}}} $ 0.999 $ R_{{\rm{I}}/{\rm{O}}}' $ -
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