Design Of Railway Wagon Bearing’s Temper- Ature Monitoring System Based On ZigBee And GPRS

During the railway wagon’s running,bearing is an important rotary component and vul-nerable part as well,whose working state directly affect the safety of the train. "Burning shaft", "hot box", "cutting-axle" and other dangerous failure may be occured when lack of oil, less oil, damage, friction and collision are found during the bearing’s operation, which also cause a significant bearing temperature rise that can be collected by sensors, therefore bear-ing state may be observed by the analysis of the change in bearing temperature. At present, more stringent requirements are put forward to the safety monitoring technology of bearing on the background of more trains running at higher speed in China. So,there is an urgent need for a real-time monitoring of bearing systems solutions, which will greatly improve the efficiency of railway freight and will be of great economic benefits.This article improves the existing bearring fault detection method and proposed vehicle axle bearing temperature monitoring method based on ZigBee wireless communication technology,according to the characteristics and needs of high speed railway wagons, such as lack of power, frequent marshalling and decomposing and coach with no one watched,etc. The system is studied and designed in three aspects from temperature colltecting, data transmission and monitoring. In section of temperature collecting:digital sensor DS18B20 is used to collect temperature and communicate with controler by 1-wire bus, which performs in a more efficient and accurate way than ever before. Data transmission part divided into two sectings:vehicle wireless transmission and train-ground data transmission. The vehicle wireless transmission system using advanced short-range wireless communications technol-ogy ZigBee, TI’s CC2530 is choosen as main control chip, which receive data by the single bus of DS18B20,communicating bearing temperature between the CC2530 with 2.4GHz wireless ad hoc network and transport them to the coordinate in the end, which solves the problem caused by frequent marshalling and decompilation and no connect on the coach. The above part is completed by IAR Embedded Workbench software and which is developed by C language. Train-ground data transmission, using a mature, stable and reliable technol-ogy GPRS, which is realized by GPRS DTU SIM900A as the core.Controler CC2530 send AT commands to the GPRS, and the GPRS will response to connect server and send data to the Internet in the way of TCP. The monitor part, is developed on the VC++ 2010 and Mi-crosoft Access 2010 software platform, in C/S mode, CC2530+GPRS performs as local clients and the ground monitoring center function as a server, both sides exchange data by socket and meanwhile data in monitor will be update in real time, and the database content constantly update as well.Finally, During the temperature measurement and data transmission and monitoring joint testing, The monitor and client is on powered, the monitor screen displays a successful connection and a real-time data that is constantly stored into database table.The function od search and query performs properly, which also proved the whole system to be good as ex-pected.