System Dynamics and Long-Term Behaviour of Railway Vehicles, Track and Subgrade

During the last decades completely new technologies for high speed railway vehicles have been developed. The primary goals have been to increase traction, axle load, and travelling speed, and to guarantee safety of the passengers. However, the new developments have revealed new limitations: settlement and destruction of the ballast and the subgrade lead to deterioration of the track; irregular wear of the wheels cause an increase in overall load and deterioration of passengers comfort; damage of the running surfaces of the rail and the wheel becomes more frequent. This problems have been investigated in the Priority Programme SPP 1015 supported by the Deutsche Forschungsgemeinschaft (DFG), aiming at a better understanding of the dynamic interaction of vehicle and track and the long-term behaviour of the components of the system. The book contains the scientific results of the programme as presented at the concluding colloquium held at University of Stuttgart, Germany, March 13-15, 2002.

Contenu

The DFG Priority Programme 'System Dynamics and Long-Term Behaviour of Vehicle, Track and Subgrade'.- Invited Lectures.- Vehicle/Track Interaction Optimisation within Spoornet.- Active Suspension Technology and its Effect upon Vehicle-Track Interaction.- Rolling-Contact-Fatigue and Wear of Rails: Economic and Technical Aspects.- Vehicle Dynamics.- System Dynamics of Railcars with Radial- and Lateralelastic Wheels.- Distributed Numerical Calculations of Wear in the Wheel-Rail Contact.- Modeling and Simulation of the Mid-Frequency Behaviour of an Elastic Bogie.- Wavy Wear Pattern on the Tread of Railway Wheels.- Rotor Dynamics and Irregular Wear of Elastic Wheelsets.- Contact, Friction, Wear.- On the Numerical Analysis of the Wheel-Rail System in Rolling Contact.- Experimental Analysis of the Cyclic Deformation and Damage Behavior of Characteristic Wheel and Rail Steels.- Friction and Wear of Tractive Rolling Contacts.- Model-Based Validation within the Rail-Wheel-Subgrade Modeling.- Track Dynamics.- Monitoring the Dynamics of Railway Tracks by Means of the Karhunen-Loève-Transformation.- Combined Modelling of Discretely Supported Track Models and Subgrade Models - Vertical and Lateral Dynamics.- Measurement and Modelling of Resilient Rubber Rail-Pads.- Model-Based Investigation of the Dynamic Behaviour of Railway Ballast.- The Dynamics of Railway Track and Subgrade with Respect to Deteriorated Sleeper Support.- Subgrade Dynamics.- Numerical Model and Laboratory Tests on Settlement of Ballast Track.- Track Settlement Due to Cyclic Loading with Low Minimum Pressure and Vibrations.- Simulation of the Dynamic Behavior of Bedding-Foundation-Soil in the Time Domain.- Dynamic Behavior of Railway Track Systems Analyzed in Frequency Domain.- Experimental and Numerical Investigations on the Track Stability.- Experimental Investigation and Numerical Modelling of Soils and Ballast under Cyclic and Dynamic Loading.- 3D-Simulation of Dynamic Interaction Between Track and Layered Subground.- Rigid Body Dynamics of Railway Ballast.- A Comparative Study of Results from Numerical Track-Subsoil Calculations.