【作者】 李政；

【导师】 黄文彬；

【作者基本信息】 重庆大学 ， 机械（专业学位）， 2023， 硕士

【摘要】 随着物联网技术的快速发展和广泛应用,无线传感网络(WSN)在走行部轴承状态监测领域中扮演着越来越重要的角色。然而,Zig Bee、Wi Fi、Bluetooth等传统无线传感网络在实际部署时面临着IP地址不足、低带宽、高能耗、实时性差等问题,基于IEEE 802.15.4e新型链路层协议的6TiSCH能够解决以上问题。其继承了IPv6协议的优势,具备更加丰富的地址空间、简化的网络配置和更高的安全性等,可以实现与IPv6网络的无缝连接。同时,由于采用了TSCH技术,6TiSCH网络具有时隙信道跳频、时间同步、调度等新功能,因此,相比于其它通信协议,6TiSCH具备低功耗、低延迟和可靠性等优势。综上,研究基于6TiSCH的无线传感网络具有重要意义。本文主要对6TiSCH技术及其在走行部轴承监测领域的应用进行了研究。在分析了6TiSCH协议、IPv6协议、TSCH技术的基础之上,借鉴已有的6TiSCH无线传感网络协议栈的相关实现思路,对现有的协议栈进行移植并添加相应的功能,设计了一种基于Contiki-NG的6TiSCH监测系统,包括6TiSCH WSN和云平台两部分。文章主要研究内容如下:(1)本文首先从走行部轴承状态监测的需求出发,对系统整体框架进行了设计。系统主要由WSN和云平台组成,其中WSN包括传感器节点、路由节点和边界路由器。为了实现云边协同的整体架构,本文专门设计了一款新型传感器节点,该节点搭载了无线模块、处理模块和网络模块,其中网络模块负责将采集的数据通过4G网络上传至云服务器。(2)对基于6TiSCH的走行部轴承状态监测系统进行软件设计,实现了低功耗嵌入式设备与IPv6网络中主机的端到端通信。本文还在监测系统中加入云平台设计,实现了云边协同的整体架构。所设计的云平台具备数据分析、报警预警等功能,同时可对节点进行远程控制,比如更新程序、节点开关等。(3)对本文构建的基于6TiSCH的监测系统进行系统功能和性能测试,主要包括6TiSCH网络的连通性、边界路由器基本功能的实现、6TiSCH传感器节点的IPv6地址获取、数据采集、数据的传输、云平台监测功能。实验结果表明,系统已具备初步的部署要求。更多还原

【Abstract】 With the rapid development and wide application of Internet of Things technology,wireless sensor networks(WSN)play an increasingly important role in the field of walking bearing condition monitoring.However,traditional wireless sensor networks such as Zig Bee,Wi Fi,and Bluetooth face problems such as insufficient IP addresses,low bandwidth,high energy consumption,and poor real-time performance when actually deployed,and 6TiSCH based on the new link layer protocol of IEEE 802.15.4e can solve the above problems.It inherits the advantages of the IPv6 protocol,with richer address space,simplified network configuration and higher security,etc.,which can achieve seamless connection with IPv6 network.At the same time,due to the use of TSCH technology,6TiSCH network has new functions such as time slot channel frequency hopping,time synchronization,and scheduling,so 6TiSCH has the advantages of low power consumption,low latency,and reliability compared with other communication protocols.In conclusion,it is of great significance to study the wireless sensor network based on 6TiSCH.This paper mainly studies the 6TiSCH technology and its application in the field of bearing monitoring of walking part.On the basis of analyzing the 6TiSCH protocol,IPv6protocol and TSCH technology,and drawing on the relevant implementation ideas of the existing 6TiSCH wireless sensor network protocol stack,the existing protocol stack is ported and corresponding functions are added,and a 6TiSCH monitoring system based on Contiki-NG is designed,including 6TiSCH WSN and cloud platform.The main research contents of the article are as follows:(1)This paper first designs the overall framework of the system from the needs of bearing condition monitoring of the walking part.The system is mainly composed of WSN and cloud platform,where WSN includes sensor nodes,routing nodes,and border routers.In order to realize the overall architecture of cloud-edge collaboration,this paper specially designs a new sensor node,which is equipped with a wireless module,a processing module and a network module,in which the network module is responsible for uploading the collected data to the cloud server through the 4G network.(2)The software design of the 6TiSCH-based walking bearing condition monitoring system realizes end-to-end communication between low-power embedded devices and hosts in IPv6 networks.In this paper,a cloud platform design is added to the monitoring system to realize the overall architecture of cloud-edge collaboration.The designed cloud platform has functions such as data analysis,alarm and early warning,and remote control of nodes,such as update programs,node switches,etc.(3)The system function and performance test of the 6TiSCH-based monitoring system constructed in this paper mainly includes the connectivity of the 6TiSCH network,the implementation of the basic functions of the border router,the IPv6 address acquisition of the 6TiSCH sensor node,data collection,data transmission,and cloud platform monitoring functions.The experimental results show that the system has preliminary deployment requirements.更多还原