FIELD TESTING OF AN INTEGRATED RESILIENT TRACKWORK SYSTEM

摘要

Field testing of a modified trackwork system for LIM powered ART transit vehicles isrndescribed. This involved installation of a 50 m length of the proposed trackwork into a curved section of anrnexisting test track, and monitoring of its response to the passage of vehicles. The monitoring system andrntesting procedure are described, and results relating to static and dynamic displacements, andrnaccelerations are presented and discussed. Results indicate that the trackwork responds primarily tornpassage of a bogie, which contains two axles, rather than to individual axle loads, and the dynamicrncomponent of pad deflection during passage of the vehicle is small and appears to be independent ofrnspeed. The maximum deflection of the elastomeric pad under crush loading is 21.5% of thernuncompressed pad thickness. The maximum loading to which a tie is subjected is 25.5% of an axle load,rnwhile the maximum change in the LIM air gap is 0.42 mm. Relatively high acceleration levels in the railrnappear to be the result of wheel and rail imperfections (flats and pits); however, the accelerations in thernconcrete guideway are effectively dampened by the elastomeric pads, thus providing a good vibrationrnisolation to surrounding ground or infrastructure.