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Tao H.,Southwest Jiaotong University | Hu H.,Southwest Jiaotong University | Jiang X.,Southwest Jiaotong University | He Z.,Southwest Jiaotong University | Zhao C.,Shanghai Railway Bureau
Dianwang Jishu/Power System Technology | Year: 2016

Recently, low frequency voltage oscillation and fluctuation appeared in a number of electrified railways, leading to train traction blockade. Low frequency voltage oscillation in integrated train-catenary system has strong unpredictability. In this paper, low frequency voltage oscillation was analyzed with impedance-based method. Integrated simulation model of HXD2B electric train and traction network was built on Matlab/Simulink, and low frequency voltage oscillation in traction power supply system was reproduced. In comparison with measured waveforms, accuracy of the proposed model was verified. On this basis, different factors affecting low frequency voltage oscillation (e.g. catenary length, connection mode of traction transformer, traction load and control parameters of train) were analyzed and discussed. Simulation results showed that both reducing traction power supply system impedance (including catenary length, connection mode of traction transformer) and increasing traction system impedance (including traction load and control parameters of train) can suppress low frequency voltage oscillation. © 2016, Power System Technology Press. All right reserved.

Hong L.,Tongji University | Qu S.Y.,Shanghai Railway Bureau
Advanced Materials Research | Year: 2013

As there are uncertainties in the public transportation network optimization evaluation process, many existing methods cannot simultaneously describe the uncertainties in different types and therefore will result in an un-objective reflection of the actual problem. In this paper set-pair and entropy analysis is used to analyze the internal connections of the system globally and locally. This model which is simple in calculation and easy to use has theoretical and practical values for new ideas and methods of uncertainty analysis of the public transportation network optimization. © (2013) Trans Tech Publications, Switzerland.

Li J.,Shanghai Railway Bureau
Journal of Railway Engineering Society | Year: 2014

Research purposes: When there was new construction project near the existing railway, the excavation activities often affected the slope stability. Even worse, the landslide would be caused as a result of the construction project and associated accidents occurred frequently. So it is essentially important to evaluate the slope stability properly in order to ensure the safe operation of existing railway. In this paper, a new reliability slope stability method was established based on the finite element strength reduction method and the point estimate method, and it was applied to an actual project. Research conclusions: (1)Slope stability evaluation method based on reliability theory, can comprehensively reflect the influence of the geotechnical parameters of spatial discreteness and time variability, the analysis result more accord with the engineering practice. (2) The reliability slope stability method established in this paper can overcome the shortcomings of traditional safety factor method and can show a better interpretation for the slope stability analysis with the variation of geotechnique parameter. (3) By using the new reliability slope stability method established in this paper, the analysis process is simple and the calculation results is consistent with the Monte-Carlo method, so it is reliable method and has a good promotional value. It can provide a good reference for the similar engineering.

Guo Z.,Shanghai Railway Bureau
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2015

Beijing-Shanghai high speed railway is the longest high speed railway in the world built under the highest standard. The passenger flow was more than 100 million in 2014. The continuous increase of passengers has approached its maximum transportation capacity. After a thorough analysis of the weak links which compromise the transportation capacity of Beijing-Shanghai high speed railway, a preliminary proposal of technology, expansion and reconstruction is put forward from the angle of system engineering to enlarge transportation capacity so as to ensure that the high speed railway can accommodate even larger passenger flow. ©, 2015, Journal Northern Jiaotong University. All right reserved.

Zheng Q.J.,Beijing Jiaotong University | Han B.M.,Beijing Jiaotong University | Li H.,Shanghai Railway Bureau
Applied Mechanics and Materials | Year: 2014

Based on the relationship between passenger flow and demand of electric multiple units (EMU), a new methodology to calculate the EMU demand and allocate the EMU is proposed, which can meet the demand of passenger as well as avoid the waste of transport capacity. An offline allocation plan of EMU is designed by analyzing the fluctuation in passenger flow, passenger average haul distance, passenger load factor and so on. Using the methodology, the EMU allocation problem is solved through program, which is used in Beijing-Shanghai High-speed Railway to obtain the EMU allocation plan. © (2014) Trans Tech Publications, Switzerland.

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