地铁曲线地段钢弹簧浮置板轨道钢轨波磨成因及控制方法OA北大核心

With the increasing speed and density of subway trains,rail corrugation appears in more and more lines,which causes serious environmental vibration and noise problems.To study the formation mechanism of rail corrugation occurring on steel spring floating slab track,rail corrugation and track dynamic response are tested on site.The finite element model of wheelset-steel spring floating slab track system in the curve section is established.The inhibition effect of friction coefficient,fastener stiffness and isolator vertical stiffness on rail corrugation is explored.The results show that the wavelength of rail corrugation is 30～50 mm in the section of steel spring floating plate.The train causes 416～694 Hz vibration when passing through the rail corrugation section.The unstable vibration of the wheel-rail system in the curve section mainly occurs on the inner wheel and the inner rail,which leads to more serious rail corrugation of the inner rail.The unstable vibration of 412.56 Hz is an important cause of rail corrugation in steel spring floating slab track section.With the decrease of curve radius,the possibility of rail corrugation increases.Especially when the train passes the curve with radius less than 600m,the friction self-excited vibration between wheel and rail is likely to occur.Reducing the friction coefficient between wheel and rail,increasing the fastener stiffness and the vertical stiffness of the vibration isolator can effectively reduce the self-excited vibration.These measures can effectively inhibit the generation and development of rail corrugation.