Research And Fabrication Of Tension Detection Device For Catenary Elastic Sling

Catenary is indispensable for the electrified railway, it can provide power energy fornormal operation of the electric locomotives and have a significant impact on the safeoperation of the railway whether it is in good condition. Catenary undergoes years of usingand works in the open spaces. Catenary failure will lead to unpredictable consequences. Theinstallation of catenary elastic sling attach to good effect in terms of improving the currentcollection of pantograph, it can increase flexibility and stability of anchor and help toeliminate the hard points. This effectively suppress the vibration amplitude of the contact line.Catenary elastic sling plays an important role in ensuring safe and stable operation andincrease the speed of the electric locomotives. The tension value of catenary elastic sling has agreat influence on the state of the entire catenary system. Also it is an important parameter toguide the construction and routine maintenance of catenary. But its value is hard to bedetected and controlled. The accuracy of existing tension testing equipment is not high. Itinevitably leads to large error to the construction and maintenance of catenary. To solve thishard problem, this paper is aiming at developing a portable, high precision tension detectiondevice to meet construction and daily maintenance needs of catenary elastic sling.Firstly, the establishment of a dynamic simulation model of catenary-pantograph iscompleted and the simulation research of catenary-pantograph vibration system in theMATLAB/simulink environment is done. Simulation curves of different speeds are given andthe data obtained from simulation is analyzed. The results show that with the increase of trainspeed, instability of bow and net system intensified. The installation of elastic sling cansuppress this instability greatly. The paper then propose to develop a device for detectingtension elastic sling value for the elastic sling tension detection problem.Secondly, this thesis introduces static cross-tensioned force measurement principle forthe elastic sling tension testing equipment research and development. This paper complete theselection of main electronic components. This system uses high performanceSTM32F103C8T6as the master chip and completes design of the whole hardware circuitincluding signal acquisition and conditioning, power management module, interface betweenbuttons and a microprocessor and so on. In basis of the hardware, this paper completessoftware development of the whole system in the KEIL_MDK3.80A developmentenvironment. Preliminary tests of core module are done to verify the higher accuracy of the instrument in measuring elastic sling tension.Finally system experiment is done and regression analysis is made for the data obtainedfrom experiment using differential method and the least squares method. Then the paper makefurther correction of the measurement results. The final results show that this unit has highaccuracy and can be applied to the elastic sling catenary construction and routinemaintenance.