Influence Of Wheel And Rail Complex Faults On The Dynamics Of Urban Rail Vehicles

The rapid development of urban rail transit vehicles in recent years has largely alleviated the urban traffic congestion caused by the rapid development of cities and the rapid growth of population.Due to the increase of capacity,a diversity of urban rail vehicles,vehicle parameters vary according to need,in order to meet the demand of more passengers,vehicles running lines also continue to increase,in such a complex operation environment,urban rail transit vehicle based show more complexity and lower orbit,so urban rail vehicle failure often not only exist in a single fault,the wheel of the fault and rail failure coupling exist at the same time.In this paper,based on the actual urban rail vehicles with actual operation lines and operating environment as the research object,in view of the common faults of wheel and rail vehicle,dynamics model is established and simulation study,reveal the vehicle in the event of a rail grinding wheel and the wheel/rail malfunction wave composite failure under certain conditions of vehicle dynamic performance and the influence of the vibration response,through this article research results can provide theoretical guidance for urban rail vehicles operating units,the operating unit in the face of the wheel/rail under the condition of compound fault for the operations of the vehicle,rail maintenance has accumulated certain theoretical basis.Therefore,in the sense of research,the research of this paper is feasible.This paper mainly studies the following aspects:1.Of all the research results of scholars at home and abroad and research analysis research,mainly includes a rail grinding fault wave at the bottom of the vehicle and the vehicle wheel for common fault types(poly wheels,wheel,wheel abnormal abrasion)study of the status quo,clearly in this paper,the research direction,determine the main content of the research,elaborated the research significance.2.The multi-rigid-body dynamics theory as the research basis,by rail and wheel on the main points as the research object,using SIMPACK software detailed reasonable vehicle coupling dynamics model is established,by analyzing the abrasion rail wavy and three common wheel of the fault(poly wheels,wheel,wheel abnormal abrasion)and by using Matlab,the reasons for AutoCAD and SIMPACK dynamics of wheel/rail composite failure to establish the corresponding reasonable simplified model,can make it in the form of compound fault combination,theoretical model for the simulation.3.Determined the research conditions including speed setting and line setting;Discusses the evaluation index,such as vertical acceleration,vibration response and frequency domain analysis of wheel/rail force,derailment coefficient,wheel weight reducing load rate,stability and Archard tread rail abrasion quantity,wheel/rail contact dynamics such as response,simulation flat scar-grinding,poly-wave,the abnormal abrasion-wave grinding the three common wheel-rail compound fault,and first of all to a single ground fault in different wave under the deep for a detailed analysis of the dynamic performance of vehicle,get along with the rising of the deep wave,dynamic parameters.4.Through the establishment of a flat scar-wave wheel/rail grinding compound fault model,by changing the parameters of the wheel tread flat scar for flat scar length,under the running speed of 50 km/h or through the curve of curvature radius is 400 m after a little curve,the wheel/rail composite failure than a single failure worse effect on vehicle dynamic response,increase the vehicle's dynamic performance;By changing the parameters of wheel and rail composite faults of different types,under the condition of flat scab-wave-grinding composite faults,the rotation repair limit of flat scab-wave-grinding in the presence of flat scab-wave-grinding was determined to be 30 mm by the load reduction rate of the wheel.The positions of tread and rail wear are 20mm~35mm,and the rail wear is closer to the direction of the wheel rim,and the wheelset wear is greater than the rail wear.5.Through the establishment of a polygon-wave wheel/rail grinding compound fault model,change the wheel polygonal fault parameters for the order number,amplitude,and wave only grinding,only under the polygon comparative analysis,it is concluded that although the trend of compound fault maintained a single polygon,but the wheel/rail composite failure than a single failure worse effect on vehicle dynamic response,intensifying the vehicle's dynamic performance;In this paper,the 5th order polygon-wave grinding fault is more sensitive to the safety index of the vehicle.Under the polygon-wave grinding composite fault,the position of tread abrasion is-10mm~20mm,rail abrasion is-15mm~5mm,and the tread abrasion is greater than rail abrasion.6.According to the second ZhangJianLi get abnormal abrasion-wave wheel/rail grinding compound fault,by changing the parameters of the abnormal abrasion wheel: the width of abrasion and wear position to change vehicle failure extent of composite,composite failure makes the vehicle wheel and rail wheel/rail wear,and the composite failure under wheel abrasion value is greater than the rail wear volume,and the wheel/rail wear is obtained easily occurs near the rolling circle 40 mm range.By research of this paper,composite ground fault and the wheel to wheel/rail composite fault formed when circumstances of urban rail vehicle dynamic performance and dynamic response analysis,get the composite fault under large spin limit and the development trend of the dynamic index,and through the body to keep power spectral density map of power spectral density value of amplitude changes with the spectrum of compound fault under spectrum analysis of different kinds of fault identification,for the operating unit of key components of vehicle maintenance and repair to provide theoretical support.