| Heavy haul is an important direction for the development of the world railway freight technology.According to 2011 Railway statistical bulletin, in 2011 the total amount of freight volume has reached 3.904 billion tons in our country. According to China’s " Twelfth five railway development plan" and the railway industry research report, it can be predicted that by 2015 the freight volume of the whole society will reach 45 billion tons, cargo turnover will reach 19.45 trillion tons km. As a national important transport, the freight volume that needs railway to send will reach 5.5 billion tons, cargo turnover will reach 4.29 trillion tons km by 2015. So equipment need to be upgraded and the railway line need to be expanded and reconstructed,especially the running of 27 t, 30 t axle-load of freight trains can significantly increase the cargo volume. The rapid development of national economy can be ensured.Under the background of the 27 t axle-load train being run over the national railway and 30 t axle-load train being run in Jin Zhongnan railway corridor,the paper studies the longitudinal dynamic problems in the running of 27 t axle-load train and 30 t axle-load train relying on related projects of China Railway Corporation. Through in-depth and detailed theoretical analysis, the 27 t, 30 t axle-load train simulation platform is established, and the longitudinal dynamic performance of the train is studied based on the platform.Train longitudinal dynamics model is in-depth studied and the braking performance of 27t、30t axle-load is optimized in the paper. The marshalling of 27 t axle-load General Freight Train is optimized using a combination of test and simulation methods. Finally, the longitudinal dynamic performance of 30 t axle-load trains are simulated in different lines and working conditions, using different equipment and manipulating mode.The paper can provide technical support and theoretical basis for the running and manipulating of 27 t and 30 t axle-load trains. |
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