Dynamic Performance Analysis Of Exported Tram Vehicle

The exported tram vehicle studied in this paper has the following characteristics: new rail/wheel Contact (UIC-OURE/54); increasing speed to 120km/h on existing railway lines; the tare and laden are very far apart (i.e., tare 22.5t, normal load 39.3t, overload 46t). complex railway-line conditions (i.e., max. degree of slope 50‰, S type curve of small radius). Because the application of bifurcation theory to wheelset limit cycles of hunting motion is not effective enough for engineering problems, linear critical speed analysis method was used in parameter sensitivity analysis and the optimized plan of increasing speed on exist railway line was figured out. Based on the mounted-characteristics of airspring, which are measured in virtual situation and compared with the airspring testrig curve, a comfort evaluation methodology of multi-vehicle trainset was presented, in which interaction between vehicles is therefore considered in comfort analysis. Since dynamical gauge calculation is formulated based on steel spring at present, the dynamical simulation method was used to compare the bogie designs to determine whether anti-roll torsion bar is used.The full vehicle and multi-vehicle trainset are composed from the subsystems built by following templates: (motor/trailer) bogie; (ending vehicle/middle vehicle) carbody. Since UIC-ORE/554 does not match well, which is proved by wheel-rail match calculation and contrast, linear critical speed method is adopted. The conclusion was found out, first of all, by parameter sensitivity analysis that longitudinal and lateral wheelset-locating-stiffness are two important factors to critical speed. Then the optimum scheme of increasing speed plan on existing railway lines is presented after trading off the following factors: wheel/rail dynamic interaction, wheel/rail wear and comfort index. Because the dynamical characteristics of airspring and interaction between vehicles are two important factors in railway vehicle comfort evaluation, the mounted-characteristics of airspring are measured in the virtual environment of full vehicle model, and the comparison with the airspring testrig curve shows that both of them have similar frequency-domain features. To meet the comfort requirements after increasing-speed, the optimized damping-performance airspring-suspension is acquired after airspring parameter sensitivity analysis. In allusion to beneficial and harmful effects caused by anti-roll torsion bar, the improved-plan of flexible-connected anti-roll torsion bar is proposed, in which the feature of displacement-lag of airspring high control and anti-roll equivalent stiffness are both considered, its effects are very significant. The indexes related to Wheel-rail derailment safety and dynamical gauge are verified further in complex-line simulation which represents the characteristics of the exported tram vehicle-served railway lines. The following results were acquired by analyzing the exported tram vehicle dynamics performance in this paper: (1) linear critical speed analysis method is applied to achieve the optimum wheel-locating-stiffness plan of increasing speed to 120km/h on existing railway lines; (2) a comfort evaluation methodology of multi-vehicle trainset is not only based on the correct airspring characteristics, but also considered interaction between different-loaded vehicles; (3) due to the unpredictability of rail irregularity in the exported tram vehicle-served railway lines, the improved plan of flexible connected anti-roll torsion bar is presented which can satisfy both dynamical gauge and comfort specifications.