首页|Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads
Analysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads
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国家科技期刊平台
NETL
NSTL
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The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads(USPs)was studied.The geometri-cally irregular refined discrete element model of the ballast particles was constructed using 3D scanning techniques,and the 3D dynamic model of the rail-sleeper-ballast bed was constructed using the coupled discrete element method-multi-flexible-body dynamics(DEM-MFBD)approach.We analyse the meso-mechanical dynamics of the ballast bed with USPs under dynamic load on a train and verify the correctness of the model in laboratory tests.It is shown that the deformation of the USPs increases the contact area between the sleeper and the ballast particles,and subsequently the number of contacts between them.As the depth of the granular ballast bed increases,the contact area becomes larger,and the contact force between the ballast particles gradually decreases.Under the action of the elastic USPs,the contact forces between ballast particles are reduced and the overall vibration level of the ballast bed can be reduced.The settlement of the granular ballast bed occurs mainly at the shallow position of the sleeper bottom,and the installation of the elastic USPs can be effective in reducing the stress on the ballast particles and the settlement of the ballast bed.
Under sleeper padsBallast bedDiscrete element methodMesoscopic mechanical dynamic characteristics
Xiong Yang、Liuyang Yu、Xuejun Wang、Zhigang Xu、Yu Deng、Houxu Li
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Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,Kunming,China
Yunnan Provincial Key Laboratory of Advanced Equipment Intelligent Manufacturing Technology,Kunming,China
National Natural Science Foundation of ChinaNational Natural Science Foundation of China
国家科技期刊平台
NSTL
万方数据
