【作者】 吴剑斌；

【导师】 熊列彬；

【作者基本信息】 西南交通大学 ， 电气工程， 2011， 硕士

【摘要】 随着铁路系统的快速发展和列车行车速度的不断提高,行车安全的要求也越来越高。接触网是电气化铁路系统的重要组成部分,工作环境十分恶劣,故障率较高。如果接触网发生故障,其涉及到的铁路干线将受到很大的影响。针对这种情况,本文给出了基于图像处理技术的接触网故障监测系统的设计思路,并对装置的硬件设计做了详细的分析。本课题的主要任务在于给出接触网故障监测系统的总体设计方案,并设计出相关的硬件平台。主要的监测对象包括：接触网腕臂的倾斜度、接触线张力、立杆及接触线现场状态、以及铁路沿线的气象信息。因此论文中给出的设计方案主要借助数字信号处理器(DSP)、AD转换芯片、红外摄像机、倾角传感器、拉力传感器、温度传感器、风向传感器、风速传感器和无线单片机通信模块等器件,来完成对接触线和支柱的状态信息的获取以及沿途气象信息的采集。当传感器采集到的数据达到设定的值,系统则启动红外摄像机,并捕获接触网的状态图像。经过图像处理后,根据图像的相似度来判定接触网故障与否。若相似度低于设定值,则通过通信模块发送监测报文。课题的设计任务根据监测系统需要实现的功能来展开,而本论文的整体思路则以接触网故障监测系统的硬件设计为出发点。文章中以TMS320DM642为核心芯片,在完成最小系统的基础上,利用AM29LV320、MT48LC4M32B、SAA7113H、AD7656、TL16752B等芯片,进行系统外围电路扩展,从而完成存储器扩展、视频解码、图像处理、数据转换及通信方案设计等工作。论文中根据模块化思想,分析了各个模块的原理和具体的功能,并按照器件选型、原理分析、电路设计和硬件调试的顺序展开论述。论文中对整体的原理图进行设计的同时,还进行了PCB设计,介绍了信号完整性的相关理论和HyperLynx仿真工具,并对所设计的PCB进行了相关的仿真。最后,论文根据集成开发环境CCS和DSP的开发过程,分析了系统的调试方法。更多还原

【Abstract】 With the rapid development of railway system and train speed unceasing enhancement, the safety awareness and demand of driving are gradually improved. The overhead catenary is an important part of the railway system, and its fault rate is high as to the working environment. If an overhead contact line breaks down, the involved railway lines will be greatly affected. According to the problem, an idea for the designing a device for early warning the fault of overhead catenary,which is based on image processing technology, has been proposed in this paper.At the same time,the design of the hardware of the device has been analyzed detailedly.The main task of this project is to propose the overall design scheme of the fault early warning device, and design the related hardware platform for it. The main monitoring objects including:catenary wrist arm lists, contact the tension, and made stem and contact wire site status, and the meteorological information along the railway. So the whole design scheme is mainly based on digital signal processor, Analog-to-Digital converter, the infrared camera, temperature sensors, wind sensors, tension sensor and wireless microcontroller and other chips to monitor the meteorological information and to acquire the image of contact lines and the pillars so as to monitor the catenary. Sensors are used to collect the data of temperature, tensile force, angle of inclination, wind direction and wind speed, etc. When some data reach or even exceed the setting value, the infrared camera will be launched and acquire an image automaticly.After processing and contrasting the images, the device could get the similarity of two images. If the similarity is lower than the setting value, warning messages will be sent through the communication module. The aim of the early warning device is to monitor the catenary, especially to monitor the potential fault exist or not of the contact lines and pillars or even broke down, so as to improve the safety of driving.According to the function of early warning device to carry out the design, and this design project focuses on data collection and image processing module. And the starting point of the paper is to design the hardware of failure warning device in catenaries. TMS320DM642 chip is the core processor for the design, and based on the minimum system, the peripheral circuit has been designed according to the chips such as AM29LV320, MT48LC4M32B, SAA7113H, AD7656, and TL16752B and so on. According to the modular idea, the principle and specific functions of each module have been analyzed. Each part has been analyzed seriously in this paper according to the sequence of selecting devices, analyzing the principle, designing the whole circuit and debugging the hardware.Both of the principle diagram and PCB are designed in the paper. At the same time, the related theories of the signal integrity and the HyperLynx simulation tools have been introduced briefly. At the end of this thesis, integrated development environment CCS and the development process of DSP have been analyzed, and the methods of debugging also have been analyzed.更多还原