Integer Programming Of Fine Adjustment Scheme For Ballastless Track Of High-speed Railway

With the rapid development of high-speed railway technology at domestic and abroad,high-speed trains has stricter requirements for track regularity and comfort.Ballastless track has become an essential part of the high-speed railway construction because of its good regularity.And the precise adjustment of ballastless track is the premise of ensuring high regularity.Nowadays,the precise adjustment for ballastless track of high-speed railway is mainly based on rail adjustment software for track measuring instrument.And it need to adjust the fastener one by one by hand.T his process is complicated and tedious,waste time and energy,inefficiency.In addition,the final adjustment results are differ as the different experience and level of technicians.In view of this,many experts and scholars have studied automated adjustment method of track.Although the existed automatic adjustment methods of track strictly might control regularities of track,they did not consider the limit of track pad/gauge block specifications,so that the adjusted rail cannot reach the expected regularity.Therefore,it is an urgent problem that the precise adjustment scheme from automatic adjustment algorithm is optimized under the condition of how to meet the requirements of practical engineering.On the basis of precise adjustment scheme of ballastless track,firstly,the optimization model for the precise adjustment scheme of the reference rail of ballastless track is established by restricting the change rate of residual deviation.Afterwards,the optimization model for precise adjustment scheme of the non-reference rail is established by restricting the change rate of gauge and level.Finally,integer programming is used to achieve automatic calculation of optimal model by programming.The different change rate are selected for carry out experimental exploration in the optimization process of the reference rail precise adjustment scheme.Experiments analysis indicates that there have less variation range of adjacent points and the whole for residual deviation when the rate of change is 1/1500.In order to analyze the accuracy of the optimization model,according to artificial experience method and newly developed integer programming software for ballastless track of high-speed railway(FAIPT),a simulate adjustment of the precise adjustment scheme from a same section is carried out.The residual deviation waveforms after simulate adjustment are compared,and the track regularity index and the change rate of residual deviation are counted.The comparative analysis shows that the change rate of adjacent point’s residual deviation ranges from-0.8 to +0.8mm/m and the change rate of gauge is easy to over limit with artificial experience method simulate adjustment.After optimized by FAIPT,the change rate of adjacent point’s residual deviation ranges from-0.67 to +0.67mm/m,which is smaller fluctuation than artificial experience method.There is no exceed over limit for the change rate of gauge,and the residual deviations of gauge and level are not over limit and both range from-0.5 to +0.5mm.In addition,the larger multi wave irregularities existing in the track residual deviation waveform can be effectively controlled.