Study On Dynamic Performance Of Four Modules 100% Low-Floor Trams

Since the implement of the reform and opening-up policy, China’s national economy has achieved greet development and people’s living standards have improved significantly. However the excessive consumption of resources and environmental issues also continue to deteriorate at the same time. Urban traffic is becoming increasingly crowded because of the rapid growth of urban population which has brought serious obstacles to the development of the city. Cities are seeking new means of transportation. Light rail transit with the advantages of saving energy, high efficiency, large capacity is favored by more and more cities, especially the 100% low floor trams which convenience passengers on and off and reduce the stop time significantly. Dozens of cities are planning to introduce this mode of transportation. Facing with the strong market demand, domestic rolling stock plants have started research on the 100% low floor trams successively.Firstly, a brief introduction about the history and the trend of the 100% low floor trams was expatiated in this paper. At the same time, the typical body structure and bogies were introduced. Secondly, a type of four modules 100% low floor tram was proposed and with the multi-body dynamics analysis software SIMPACK, dynamic simulation model of the 100% low floor tram was established. Then the steering principle of the conventional wheelset, independent rotating wheel, lateral coupling independent rotating wheel and longitudinal coupling independent rotating wheel were compared in theoretical analysis. Then the SIMPACK software was used to testify the analysis. The simulation result indicates that no matter in the straight railway or curve track, the steering capacity of longitudinal coupling independent rotating wheel is better compared to the independent rotating wheel. Thirdly, refered to the standard of vehicle dynamics performance GB/T 5599-1985, the suspension parameters of the 100% low floor tram was optimized on the basis of the original suspension parameter. Finally, the stability, ride comfort and curve passing ability of the dynamic model were analysed by using the SIMPACK software. The analysis results indicate that the dynamics model of 100% low-floor tram has excellent stability along the straight railway track and good ride comfort no matter in the state of empty or full capacity; every curve performance indicators have reached the requirements of GB/T 5599-1985, and it can pass through little-radius curve railway track safely in the city.