Study On Wheel/rail Curve Noise And Wear Mechanism And Lubrication Control Technology Based On Simulation Experiment

With the development of High-speed railway and urban rail transit , our country will come to a new times in railway field. But at the same time we have to face some problems such as operation quality degradation,track quality deterioration and noise increase and so on. Especially the squeal in railway curve has the bad effect on passengers and residents , at the same time the railway wear become so serious that directly effect on the cost of rail transport and endanger the perform-safe of the train. So the research of curve scream noise and lubrication control has important economic viability and guiding function in this society.Lubricanting on the curve of rail is a popular measure to cut rail wear and reduce noise during the recent several ten years, but the result which is made by the ordinary rail lubricant is not obviously. Although it is useful for the noise-reducing of rail, friction coefficient between railwheels is decrease after lubricanting which lead the traction is not enough and threat the safety of train traffic. In this paper we prepare lubricant based the theories of ' friction damping associated' and 'elastic supporting effect of oil film micro-bulge' which is raised by Gao Zhongyong Professor, and it is get rid of the traditional Negative Damp theroy , which expand the preparation of the wheel -rail lubricant.Through the friction pendulum test, simulation wheel-rail noise reduction test and wear test in addition to spectrum and modal analysis ,this paper evaluate the ability which control the wheel-rail squeal and wear by self-preparation of wheel-rail lubricants and analysis the mechanism of the lubricant ability noise reducing and antiwear ; Through testing the coefficient of dynamic friction and static friction of wheel-rail lubricants and their's differentials in addition to viscosity and surface tension, we analysis this physical property to influence wheel-rail lubricants' noise reducing and antiwear ability. We have reached the following conclusions:When configuration wheel-rail lubricants, we should emphasis on the little differentials between coefficient of dynamic friction and static friction which never consider the lubricants rising characteristic of relation between friction force and relative sliding speed . It can behave good ability of control friction self-excited vibration, moreover it can control the wheel-rail squeal effectively.Viscosity and surface tension between wheel-rails effects the lubricants'infiltrating and adsorptivity, the better infiltrating and adsorptivity lubricants has ,the more obviously elastic supporting effect of oil film on micro-bulge is , and the lubrican ability of noise reducing and antiwear is more better.The self-prepare lubricants have good elastic supporting effect of oil film on micro-bulge, it is useful for improving wheel-rail's wear hardness and reducing the curve wheel-rail's wear.