Analysis and Optimization of Dynamic Performance of High-Speed United Type Transition Section

With the development of Chinese railway, especially the urban metro transport and the electrified railway under the mountainous long tunnels, the dynamic performance of overhead conductor rail (OCR) system has become a popular research issue. The united type transition section is an important structure that restricts the current collection quality of high-speed pantograph and OCR system. In this paper, a pantograph-catenary model was developed based on finite element method, which consists of OCR, overhead contact line (OCL), and a united type transition section. Based on the pantograph-catenary model, the effects of operating speed and cut depth of the conductor rail on the dynamic performance of the pantograph-catenary are analyzed. The results show that the transition section is the position where the dynamic performance is the worst, and the dynamic performance of the system when the pantograph enters the OCR from the OCL are worse than that from the OCR to the OCL at 160 km/h, 180 km/h, and 200 km/h. As the speed increasing continuously, the dynamic performance of the pantograph-catenary system deteriorates significantly. From the OCR to the OCL, the maximum value of contact force becomes significantly larger (191.48N → 340.41N), the minimum value of contact force becomes significantly smaller (28.26N → 0N), the standard deviation of contact force becomes larger (29.64N → 70.83N). By designing a type of cut section of the united type transition section scheme, the times of contact loss can be reduced to 0 at 200 km/h.