A simulation study on the dynamic response of track deflection produced by running vehicle

• Main Authors: Chun-chi Liao, 廖浚祺
• Other Authors: Ye-Ee Wu
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/41928216538337833897

碩士 === 國立臺灣科技大學 === 機械工程系 === 100 === The objective of this study is to investigate the dynamic response of track deflection caused by running vehicle using an established simulation model. In this study the actual parameters of vehicle (EMC car of EMU500 of TRA at the highest loading condition) and track system (UIC 60 rail) were adopted to conduct the simulation analyses. At first, simulation results obtained from straight even rails were compared with the on-site strain measured in the longitudinal direction of the rail obtained by CECI to validate the applicability and the suitability of this simulation model. Then the effects of axial loading, track irregularity and wear rails on the dynamic response of track deflection were studied. The simulated dynamic response of the stain in the longitudinal direction of the rail obtained from straight even rails show the same trend as that measured by CECI except the shape and the maximum amplitude values (about 20% difference). The simulation curve is a smooth curve, but the measured curve is a serrated one; further simulation analyses using rails with irregularity reveal that this serrated behavior is related to the irregularity of the track. This result implies that the simulation model applied in this study is very sensitive to rail irregularity. Simulation analyses also show that the axial loading has strong influence on the maximum amplitude value. The actually measured maximum strain value is higher than the maximum strain value obtained from the simulation analyses using S1(empty vehicle) loading condition, the difference is about 5%. Simulation results also indicate that the wear of rail head will increase the vertical track deflection; in the most severe allowable condition (with even wear of 14 mm) the vertical track deflection can reach 0.14mm.