铁路长途通信光缆性能劣化分析研究

发布时间：2018-05-06 21:46

本文选题：传输性能 + 劣化　；参考：《北京交通大学》2017年硕士论文

【摘要】：随着信息社会的发展,通信网络的重要性不仅仅关乎个人,更是上升到了国家信息安全的高度。铁路作为国家重要的基础设施、国民经济的大动脉和大众化的交通工具,是运输行业中的中流砥柱,其安全性对于国家和人民尤为重要。通信光缆作为铁路传输网传输信息的基础载体,对铁路的行车安全起到了决定性的作用。然而通信光缆传输性能的劣化问题具有一定的隐蔽性,这对铁路通信传输网的安全稳定运行构成了巨大的威胁。本论文主要从不同运用时长、不同地形、不同气候、不同敷设方式这四个维度,并结合施工、维护和自然灾害等外力因素对光缆性能劣化的影响进行了综合研究,根据光缆中光纤损耗值变化情况,提出了光纤损耗的预测算法,主要工作和具体研究成果如下:(1)通过研究光缆光纤的基本结构、组成材料与性能指标,文章得出光缆性能劣化程度主要受自身材料、自然环境以及施工维护等因素的影响,并分别对此三种影响因素进行深入分析。(2)从不同运用时长、不同地理、不同气候、不同敷设方式四个维度选定光缆测试样本,制定测试方案和方法。文章主要围绕光缆样本进行了现场测试和调研。现场测试了光缆的衰减系数、终端收容情况、接头数量、接头质量、微弯损耗、缆伤和偏振模色散系数等基本数据;现场调研主要对光缆组成材料、外皮、缆膏纤膏、涂覆层、纤芯的变化情况进行调查。通过对这些因素的定量分析与研究,文章得出上述四个维度以及施工、维护等外力因素对光缆的性能劣化造成的影响结果。(3)文章提出了三次指数平滑的光纤损耗预测算法,通过对比分析一次平滑、二次平滑、三次平滑预测曲线,得出三次平滑指数的光纤损耗值更接近实际损耗值,并探讨了三次平滑指数系数α的选择精度对预测绝对误差的影响,最终实现了预测绝对误差最小,预测结果与实际值吻合度较好的仿真结果,为铁路光缆网的建设和维护提供了重要的依据。
[Abstract]:With the development of information society, the importance of communication network is not only related to individuals, but also to the height of national information security. As an important national infrastructure, railway is the mainstay of the transportation industry, and its safety is particularly important for the country and the people. As the basic carrier of railway transmission network, communication optical cable plays a decisive role in railway safety. However, the deterioration of transmission performance of optical communication cable has a certain degree of concealment, which poses a great threat to the safe and stable operation of railway communication transmission network. In this paper, the effects of external forces such as construction, maintenance and natural disasters on the deterioration of optical fiber cable performance are studied comprehensively from four dimensions: different operating time, different terrain, different climate, different laying methods, and combined with external forces such as construction, maintenance and natural disasters. According to the change of optical fiber loss value in optical fiber cable, a prediction algorithm of fiber loss is proposed. The main work and concrete research results are as follows: 1) by studying the basic structure, material and performance index of optical fiber, The paper concludes that the deterioration degree of optical fiber cable performance is mainly affected by its own material, natural environment and construction and maintenance, etc., and analyzes these three factors in depth respectively from different application time, different geography, different climate, etc. Four dimensions of different laying methods selected optical cable test samples and developed test plans and methods. This paper mainly focuses on the field test and investigation of optical cable samples. The basic data such as attenuation coefficient, terminal reception, connection number, joint quality, micro-bending loss, cable injury and polarization mode dispersion coefficient were tested in the field. The changes of the core were investigated. Based on the quantitative analysis and research of these factors, the paper draws the conclusion that the four dimensions mentioned above and the influence of external forces such as construction and maintenance on the performance deterioration of optical fiber cable. The paper puts forward a three-order exponential smoothing algorithm for predicting the loss of optical fiber. By comparing and analyzing the prediction curves of primary smoothing, quadratic smoothing and cubic smoothing, it is found that the fiber loss value of cubic smoothing index is closer to the actual loss value, and the influence of the selection accuracy of cubic smoothing index coefficient 伪 on the prediction absolute error is discussed. Finally, the simulation results of minimum absolute error and good agreement between the prediction results and the actual values are realized, which provides an important basis for the construction and maintenance of the railway optical cable network.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U285.1;TN913.33

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