Characteristics Of Wheel-Rail Vibration On Planar And Vertical Section In High-Speed Railway

With the comprehensive construction and rapid development of high-speed railway, the running mileage in our country has been the world’s longest one. But the studies on high-speed railway in China start late, many planar and vertical section’s parameters are still based on the test results in common railway, or are referred to foreign high-speed railways. On one hand, the continuous increase of vehicle running speed leads to more severer wheel-rail vibration, so that the previous analysis based on static or quasi-static cannot meet the requirement of dynamic design for the high-speed railway; on the other hand, the running mileage and terrain environment abroad are different from that in China, so the practical applicability of foreign parameters need to be testified. Based on the multi-body system dynamics, the characteristics of wheel-rail vibration in high-speed railway are studied in this paper, so as to obtain the parameters’dynamic reasonable design and matching on the planar and vertical section.A brief introduction of planar and vertical section’s parameters is given in this thesis. The circular curve radius and super-elevation need to both consider the high-speed vehicle and medium-speed vehicle collinear transportation, meanwhile, the transition curve length and vertical curve radius influence passengers’comfort. All the parameters are calculated according to the traditional design. Therefore, it is necessary to suggest the parameters’ values on the basis of simulation results.Using the SIMPACK software, the dynamic model of high-speed vehicles passing through the planar and vertical section is established by simplifying the process of high-speed electric motor train unit (EMU). Then, the characteristics of wheel-rail dynamic response calculated by the single-vehicle model and multi-vehicle model are contrasted and analyzed. Results show that, without considering the train’s traction and braking, the difference of two models’dynamic indexes is very little.The influence of planar and vertical section’s parameters on wheel-rail vibration in high-speed railway is analyzed. Results show that, the matching between super-elevation and circular curve radius should meet the requirement of wheel-rail dynamic performance of the high-speed vehicle and medium-speed vehicle collinear transportation; the transition curve length should reasonably match with circular curve radius; along with the increase of radius of vertical curve, the indexes of wheel-rail vertical dynamic performance linear decrease, but it almost not be influenced by slope difference. The wheel-rail dynamic performance with different combinations of planar and vertical section in high-speed railway is analyzed. When the vertical curve overlaps the transition curve or circular curve, the rate of wheel load reduction and the vertical acceleration of car-body will increase obviously. When the start or end point of vertical curve coincides with the key points which are between the neighboring line segments on the plan, the wheel-rail dynamic performance will be poor.