Study On Alignment Parameter And Its Vehicle Dynamic Behavior For Heavy Haul Railway

Today heavy haul railway transport is one of the main development direction inrailway field. With the increase of running speed, axle load and marshalling, thedynamic interaction of wheel/rail will be more complicated. So the pursuiting of moreheavier, longer and faster trains will bring unexpected problems: On the one hand, therail, the rail fastening and sleeper will be damaged more accelerately. On the otherhand, the dynamic response of the heavy haul train will be affected severely. Vehiclesand route is a unified system, reasonable route design is the key to the success ofheavy haul railway. Therefore how to meet the demand and challenge of the heavyhaul railway by the means of optimizing of route alignment parameters has beenbecame goal of which many people pursuit in railway field.This paper analyzes and summarizes the former studies on the parameters, andmakes a further study on it by means of theoretical analyses, field test and numericalsimulation. The major work are as follows:First, a complete C80heavy haul train model based on UM software isestablished, and it was validated according to dynamic load test data in shen-shuorailway. The results indicate that the difference between the two group datarespectively obtained from the field test and simulation is minor. They have the samepattern though there are some differences in the values. Two purposes are achievedthrough the field test: one is that the model can be used for dynamic simulationanalysis, and the other is that the C80heavy haul train with no more than80km/h issafe when running in continuous reverse small curve radius section.Then, the influence of the route alignment parameters (length of the transitioncurve, length of intermediate straight line and intermediate circular curve, curveradius, superelevation, vertical curve radius, overlapping of plane curve and verticalcurve) on the vehicle dynamic response is studied by the C80heavy haul train model.We got the basic principle of heavy haul railway alignment parameters selection, andit can provide some reference for evaluating and optimizing route alignment parameters.Finally, the paper analyzes the sensitivity of the light and heavy vehicle dynamicresponse to the form of the track geometry deviation(rail gauge, track cross level,track alignment, longitudinal level of rail, twist)by means of the C80heavy haul trainmodel. It turned out that for the deviation management value, there is still a certainallowance between the maximum value of adverse influence on the dynamic indexand the safety limit stipulated in the standard specification, so deviation managementvalue can be increased appropriately according to particular case; Different forms ofthe track geometry deviation makes different degrees of impact on rate of change foreach index of light and heavy vehicle, and the light vehicle is greater than the heavyvehicle for index’s rate of change; The sensitivity of the light vehicle dynamicresponse to the track geometry deviation is more than heavy vehicle; The positiveamplitude of rail gauge irregularity, track cross level irregularity and longitudinallevel of rail irregularity is superior to the negative amplitude in security and stability,the twist irregularity is opposite and the positive amplitude of the track alignmentirregularity is the same to negative amplitude. The difference amount of dynamicsevaluative index(the wheel-rail lateral force, the derailment coefficient, the lateralacceleration) casued by the positive and negative amplitude of rail gauge irregularityis the most significant.