Study On The Influence Of Wheel Profile On Energy Consumption Of Heavy Haul Railpway

As is well-known,rail transportation has advantages in transport volumes,velocity,energy-saving compared with other transportation.While rail transportation has a significant advantage in energy-saving,there are enormous energy consumed in rail transportation still.In order to meet the needs of national development,respond to the national call of energy-saving and emission reduction,it’s indispensable to research on the influencing factors of energy-saving in rail transportation.Rail transportation has a greatest feature in the wheel/rail relationship compared with other transportation.Therefore,it has practical significance to study the influencing factors of energy-saving from the wheel/rail relationship.In this study,a field test of the rail tread profiles on Huanghuagang Station of Shuohuang Railway was conducted firstly,and wheel profile of LM Type with different wear times has been measured.Through the graphs of the number of curves of different radius on Shuohuang Railway,the main parameters of the wheel/rail relationship was obtained.In addition,Through reading the literature,access to relevant information,the parameters of the wheel/rail relationship were obtained after applying friction modifier.On the basis of these raw data,an energy-saving calculation theory model has been further improved combined with the improved top friction modifier model,computational method of friction work and computational method of spin creepage torque.At last,the impact of wheel tread profile of LM Type with different wear times and top friction modifier on energy-saving were analyzed by the dynamics analysis software and numerical calculation software.An introduction and the main findings of this study includes:1.After the C80 vehicle dynamics model was established by SIMPACK software,it was found that it can not only lowering the saturated COF at the wheel/rail interface,but also affect the corresponding Kalker Weighting factor.Based on the fact,the parameters of the dynamics analysis are provided,the original dynamics and energy-saving analysis methods are corrected.On this basis,the corresponding numerical calculation program is written.2.A field research of the wheel/rail relationship on Huanghuagang Station of Shuohuang Railway is conducted,the work can be divided into three parts.The first part,a field test of the rail tread profiles on Shuohuang Railway was conducted.Compared with measured track excitation,it was found that there were wave mills with a wavelength of about 80 mm and severe wear and damage on the surface of the rail.The second part,0 to 30 million meters of different wear period wheel tread profile profile was obtained from the mearsurement.The third part,combined with the graphs of the number of curves of different radius,the radius of the curves of various working conditions in this paper is determined.3.The influence due to the application of the top of rail friction modifier and the wheel prolfile on dynamic performance is analyzed with the C80 vehicle model.Simulation result show that with the increase in wheel wear mileage,the vehicle’s wheel/rail forces,rate of wheel load reduction and derail coefficient all increase first and then decrease before and after applying friction modifier.The existence of friction modifier can improve the wheel/rail vertical forces,rate of wheel load reduction and the vehicle’s vertical stability.So overall,the vehicle operating process is safe and stable due to the application of the friction modifier.4.The energy-saving achieved by applying the top of rail friction modifier is calculated and analyzed under different operation conditions such as wheel tread profile with different wear times,running speed,track curve radius,as well as rail cant and the economy caused by energy saving is studied at the same time.Simulation results show that the vehicle’s velocity has a more significant influence on energy-saving,the energy saving amount increases as the speed increases.At the same time,the rail cant also has a more significant influence on energy-saving,the energy saving amount increases as the rail cant increases.Economic analyses show that the application of the top of rail friction modifier on small radius curves helps Shuohuang Railway save 15.9 million kWh electricity every year,equivalent to saving 7.95 million kg coal burning and 23.3kg carbon dioxide emissions.