超声流量计数字化网络通信系统设计与实现
发布时间：2018-08-31 17:27
【摘要】：随着Internet技术和计算机技术的快速发展，网络化仪表日益显示出有别于传统仪表的优越性和便易性，成为现代智能仪表的发展趋势。为提高TMSR的安全性，该技术逐步应用于现在反应堆中的数字化分布式仪控系统（DCS）中。 在TMSR的熔盐回路流量测量时，数字化的超声流量计获得的流量数据需要先经数模转换（DAC）成4-20mA模拟量，再经PLC的模数转换（ADC）后才能上传至DCS网络。本文在研制的数字化时差法超声流量计样机的基础上扩展了以太网接口，将超声流量计通过该以太网接口直接接入DCS系统网络中。由于到TMSR的回路控制系统采用EPICS（Experimental Physics and IndustrialControl System）开发，，在系统的上位机中设计采用了相应的EPICS数据接口，确保数字超声流量计与上位机之间按照服务器/客户端（Client/Server）结构模式进行有效通信。 在超声流量计网络接口设计中，采用了DM9000网卡芯片搭建网络通信模块，并使用超声流量计本身的数字信号控制器（DSC）TMS320F28335作为网络通信的控制器。在DSC上开发了DM9000的驱动程序，并移植了用于嵌入式通信的uIP协议栈，开发了实现数据发送功能的客户端程序。在上位机EPICS端，开发了用于数据接收的服务器程序，并在OPI层设计了实时流量显示的界面窗口。另外，在超声流量计的超声信号处理时，增加了“Hamming”窗技术，有效地滤除了超声信号中的干扰信号。 本文设计的网络通信接口为熔盐实验回路中的流量监控提供了一个可靠的解决方案，在精简系统结构的同时实现了稳定可靠的测量数据传输，达到了预期的设计目标。
[Abstract]:With the rapid development of Internet technology and computer technology, networked instruments are increasingly showing the superiority and convenience, which is different from the traditional instruments, and has become the development trend of modern intelligent instruments. In order to improve the safety of TMSR, the technology is gradually applied to the digital distributed instrument control system (DCS) in the reactor. In the flux measurement of molten salt loop of TMSR, the flow data obtained by digital ultrasonic Flowmeter need to be converted into 4-20mA analog quantity by digital-analog conversion (DAC), and then transferred to DCS network by PLC analog-to-digital conversion (ADC). In this paper, the Ethernet interface is extended on the basis of the digital moveout ultrasonic Flowmeter prototype, and the ultrasonic Flowmeter is directly connected to the DCS system network through the Ethernet interface. Because the loop control system to TMSR is developed by EPICS (Experimental Physics and IndustrialControl System), the corresponding EPICS data interface is designed in the upper computer of the system. Ensure effective communication between digital ultrasonic Flowmeter and host computer according to server / client (Client/Server) structure. In the design of the network interface of ultrasonic Flowmeter, the DM9000 network card chip is used to build the network communication module, and the digital signal controller (DSC) TMS320F28335 of the ultrasonic Flowmeter itself is used as the controller of network communication. The driver of DM9000 is developed on DSC, the uIP protocol stack for embedded communication is transplanted, and the client program is developed to realize the function of data transmission. The server program for data receiving is developed in the upper computer EPICS, and the interface window for real-time flow display is designed in the OPI layer. In addition, the "Hamming" window technique is added to the ultrasonic signal processing of ultrasonic Flowmeter, which can effectively filter the interference signal from the ultrasonic signal. The network communication interface designed in this paper provides a reliable solution for flux monitoring in molten salt experimental circuit. It can realize stable and reliable measurement data transmission while simplifying the system structure and achieve the expected design goal.
【学位授予单位】：中国科学院研究生院（上海应用物理研究所）
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814
本文编号：2215669
[Abstract]:With the rapid development of Internet technology and computer technology, networked instruments are increasingly showing the superiority and convenience, which is different from the traditional instruments, and has become the development trend of modern intelligent instruments. In order to improve the safety of TMSR, the technology is gradually applied to the digital distributed instrument control system (DCS) in the reactor. In the flux measurement of molten salt loop of TMSR, the flow data obtained by digital ultrasonic Flowmeter need to be converted into 4-20mA analog quantity by digital-analog conversion (DAC), and then transferred to DCS network by PLC analog-to-digital conversion (ADC). In this paper, the Ethernet interface is extended on the basis of the digital moveout ultrasonic Flowmeter prototype, and the ultrasonic Flowmeter is directly connected to the DCS system network through the Ethernet interface. Because the loop control system to TMSR is developed by EPICS (Experimental Physics and IndustrialControl System), the corresponding EPICS data interface is designed in the upper computer of the system. Ensure effective communication between digital ultrasonic Flowmeter and host computer according to server / client (Client/Server) structure. In the design of the network interface of ultrasonic Flowmeter, the DM9000 network card chip is used to build the network communication module, and the digital signal controller (DSC) TMS320F28335 of the ultrasonic Flowmeter itself is used as the controller of network communication. The driver of DM9000 is developed on DSC, the uIP protocol stack for embedded communication is transplanted, and the client program is developed to realize the function of data transmission. The server program for data receiving is developed in the upper computer EPICS, and the interface window for real-time flow display is designed in the OPI layer. In addition, the "Hamming" window technique is added to the ultrasonic signal processing of ultrasonic Flowmeter, which can effectively filter the interference signal from the ultrasonic signal. The network communication interface designed in this paper provides a reliable solution for flux monitoring in molten salt experimental circuit. It can realize stable and reliable measurement data transmission while simplifying the system structure and achieve the expected design goal.
【学位授予单位】：中国科学院研究生院（上海应用物理研究所）
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH814
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