| The catenary compensation device is responsible for adjusting the tension of the contact wire and the messenger wire,which is an important device for improving the current receiving conditions of the pantograph and catenary of electric locomotives and improving the operating quality of the catenary.When the catenary compensation device fails,the current collection of the train will be directly affected.Therefore,it is necessary to carry out condition monitoring,but the existing monitoring system only focuses on the realization of compensation device b-value monitoring,and there is no in-depth research on new communication scheme,terminal energy-saving strategy,catenary condition monitoring.In view of the above problems,from the four aspects of terminal design,wireless communication,website development,and data analysis,the monitoring system of the catenary compensation device is designed.Firstly,the thesis compares and analyzes wireless communication technologies from multiple perspectives such as transmission rate,coverage,power consumption and cost.While taking into account the installation environment and functional requirements of monitoring terminal,it is analyzed that NB-Io T communication is more suitable for the monitoring system of catenary compensation device.The network scheme is designed based on NB-Io T,which is verified to be able to realize the stable communication between the monitoring terminal and the website through field testing.Secondly,in order to ensure the long-term stable operation of the monitoring terminal,the energy-saving strategy is studied.The dormancy technology is used to design the main controller for energy-saving.Based on PSM power-saving technology and edrx power-saving technology,the communication module runs with low power consumption.By comparing the daily power consumption of main terminal devices before and after the energy-saving design,the results show that the sum of the daily power consumption is only 6.5% of that without the energy-saving method,which verifies the effectiveness of the method.Thirdly,in order to predict the fluctuation trend of catenary compensation device,based on the measured data,the correlation between temperature and b-value is analyzed from three aspects of chart,covariance and correlation coefficient,and the conclusion that the two are highly correlated was drawn.On this basis,the polynomial fitting function of temperature and b-value is constructed by using the least square algorithm.Combined with the forecast temperature issued by the National Meteorological Administration,the state prediction of catenary compensation device is realized.In order to study the vibration frequency characteristics of the catenary compensation device,the fast fourier transform algorithm was used to analyze the variation of the b-value.The result shows that its vibration frequency was mainly concentrated in the low frequency band below2 Hz.Finally,the thesis develops a set of software and hardware monitoring system for cantenary compensation device.Based on the above energy-saving method,the hardware monitoring terminal adopts 32-bit arm architecture embedded system to realize the dualmode acquisition of b-value,temperature,longitude and latitude information.The collected data information is transmitted to the upper computer through NB-Io T wireless communication network.The upper computer platform realizes the functions of data query and export,user management,status monitoring and fitting prediction of compensation device,parameter management and status monitoring of monitoring terminal.The monitoring system is now installed in Beijing EMU depot,which can run stably for a long time.It has a certain practical value and can reduce the manpower and material resources in the detection of catenary.At the same time,the research and development of the system has a certain reference value in the construction of railway 6C system,Internet of things communication,intelligent monitoring and other fields. |
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