【摘要】：本文依托于城軌列車傳感器網(wǎng)絡(luò)接入節(jié)點(diǎn)、復(fù)合節(jié)點(diǎn)與測(cè)試評(píng)估平臺(tái)項(xiàng)目(國(guó)家863計(jì)劃),對(duì)城軌列車傳感器網(wǎng)絡(luò)平臺(tái)的建設(shè)進(jìn)行了設(shè)計(jì)研究。國(guó)內(nèi)的城市軌道列車上采用的列車控制技術(shù)多從國(guó)外引進(jìn),缺少自己的知識(shí)產(chǎn)權(quán)。尤其是目前沒(méi)有獨(dú)立的、大容量的、成套的列車運(yùn)行安全狀態(tài)實(shí)時(shí)感知系統(tǒng),為列車的安全、可靠、準(zhǔn)時(shí)運(yùn)行提供保證,因此針對(duì)我國(guó)城市軌道運(yùn)行安全特性,建立一套標(biāo)準(zhǔn)化、系統(tǒng)化的城軌列車傳感器網(wǎng)絡(luò)意義重大。 首先,對(duì)傳感器網(wǎng)絡(luò)功能結(jié)構(gòu)、網(wǎng)絡(luò)結(jié)構(gòu)、傳感器數(shù)據(jù)的傳輸進(jìn)行分析,提出了傳感器網(wǎng)絡(luò)中存在的技術(shù)問(wèn)題。還指出了影響網(wǎng)絡(luò)通信實(shí)時(shí)性的主要因素,在建立城軌傳感器網(wǎng)絡(luò)應(yīng)主要解決網(wǎng)絡(luò)關(guān)鍵節(jié)點(diǎn)調(diào)度策略問(wèn)題,以滿足平臺(tái)實(shí)時(shí)性的要求。 其次,設(shè)計(jì)一個(gè)城軌列車傳感器網(wǎng)絡(luò)數(shù)據(jù)傳輸平臺(tái),此平臺(tái)可仿真實(shí)際運(yùn)行的網(wǎng)絡(luò)和系統(tǒng)。在平臺(tái)中引入工業(yè)以太網(wǎng)通信技術(shù)。從傳感器網(wǎng)絡(luò)的功能需求角度出發(fā),設(shè)計(jì)網(wǎng)絡(luò)中的功能節(jié)點(diǎn)；從網(wǎng)絡(luò)可靠性角度出發(fā)設(shè)計(jì)網(wǎng)絡(luò)功能節(jié)點(diǎn)的組網(wǎng)方式,建立一個(gè)由數(shù)據(jù)采集層、數(shù)據(jù)接入層、數(shù)據(jù)傳輸層以及數(shù)據(jù)處理層組成的四層網(wǎng)絡(luò)結(jié)構(gòu)；根據(jù)功能節(jié)點(diǎn)的功能定義選擇設(shè)備,搭建物理平臺(tái)；設(shè)計(jì)數(shù)據(jù)傳輸模擬系統(tǒng),實(shí)現(xiàn)平臺(tái)的數(shù)據(jù)傳輸功能。 再次,分析在城軌列車傳感器網(wǎng)絡(luò)數(shù)據(jù)傳輸平臺(tái)中,影響網(wǎng)絡(luò)通信延遲的主要因素,得出排隊(duì)延遲的影響最大。為了降低數(shù)據(jù)的排隊(duì)延遲,在IEEE802.1P標(biāo)準(zhǔn)幀結(jié)構(gòu)中引入截止期限字段,并在網(wǎng)絡(luò)關(guān)鍵節(jié)點(diǎn)處設(shè)計(jì)了優(yōu)先級(jí)隊(duì)列下FCFS與EDF相結(jié)合的調(diào)度策略。利用opnet仿真技術(shù)驗(yàn)證改進(jìn)調(diào)度策略的有效性。 最后,對(duì)城軌列車傳感器網(wǎng)絡(luò)中的延遲模型做了改進(jìn),利用改進(jìn)的延遲模型評(píng)價(jià)平臺(tái)的傳輸實(shí)時(shí)性能。網(wǎng)絡(luò)演算算法中的服務(wù)曲線根據(jù)聯(lián)合調(diào)度策略的工作原理進(jìn)行定義。計(jì)算城軌列車傳感器網(wǎng)絡(luò)數(shù)據(jù)傳輸平臺(tái)端對(duì)端傳輸?shù)木W(wǎng)絡(luò)時(shí)延,分析結(jié)果得出網(wǎng)絡(luò)時(shí)延小于數(shù)據(jù)的發(fā)送周期。由此可見(jiàn),數(shù)據(jù)傳輸平臺(tái)實(shí)時(shí)性能可以得到保證。
[Abstract]:Based on the access node of urban rail train sensor network, composite node and test and evaluation platform project (National 863 Plan), the construction of urban rail train sensor network platform is designed and studied in this paper. Most of the train control technologies used in domestic urban rail trains are introduced from abroad and lack of their own intellectual property rights. Especially at present, there is no independent, large capacity, complete set of train operation safety real-time sensing system, which provides a guarantee for the safety, reliability and punctual operation of the train, so in view of the safety characteristics of urban rail operation in our country, It is of great significance to establish a set of standardized and systematic urban rail train sensor networks. Firstly, the function structure, network structure and sensor data transmission of sensor network are analyzed, and the technical problems existing in sensor network are put forward. The main factors affecting the real-time performance of network communication are also pointed out. In order to meet the real-time requirements of the platform, the key node scheduling strategy of the network should be solved in the establishment of urban rail sensor network. Secondly, a data transmission platform of urban rail train sensor network is designed, which can simulate the actual running network and system. Industrial Ethernet communication technology is introduced into the platform. From the point of view of the functional requirements of sensor networks, the functional nodes in the network are designed. From the point of view of network reliability, the networking mode of network function nodes is designed, and a four-layer network structure composed of data acquisition layer, data access layer, data transmission layer and data processing layer is established. According to the function definition of the function node, the equipment is selected, the physical platform is built, and the data transmission simulation system is designed to realize the data transmission function of the platform. Thirdly, the main factors that affect the network communication delay in the data transmission platform of urban rail train sensor network are analyzed, and it is concluded that the queuing delay has the greatest influence. In order to reduce the queuing delay of data, the deadline field is introduced into the IEEE802.1P standard frame structure, and the scheduling strategy of combining FCFS and EDF under priority queue is designed at the key nodes of the network. Opnet simulation technology is used to verify the effectiveness of the improved scheduling strategy. Finally, the delay model in urban rail train sensor network is improved, and the improved delay model is used to evaluate the transmission real-time performance of the platform. The service curve in the network calculus algorithm is defined according to the working principle of the joint scheduling strategy. The network delay of end-to-end transmission of urban rail train sensor network data transmission platform is calculated, and the analysis results show that the network delay is less than the transmission period of the data. Thus it can be seen that the real-time performance of the data transmission platform can be guaranteed.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U270.38

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