山地地铁小半径曲线有/无轨缝区钢轨波磨成因OA

To address the two types of rail corrugation in small radius curves of the Chongqing metro(short-wavelength corrugation on inner rails in the sections without rail gaps,and long and short-wavelength corrugation on inner rails in the sections with rail gaps),the comparative study on the causes of two types of rail corrugation was conducted based on the theory of wheel-rail frictional coupling vibration.The finite element models of the wheel-rail systems in the section with and without rail gaps in small radius curves were established,and their stabilities were investigated using the complex eigenvalue analysis method.Then,the dynamic response of the wheel-rail system under the effects of rail gap and rail corrugation irregularities was investigated using the transient dynamic analysis method.The results have shown that the wheel-rail system exhibits frictional self-excited vibration in both sections with and without rail gaps on small-radius curves,with main frequencies of 479.26 Hz and 477.65 Hz,respectively,which can induce short-wavelength corrugation from 30 to 40 mm.Rail surface irregularities increase the dynamic response of the wheel-rail system.The induced feedback vibration has a main frequency of 112.79 Hz,thus inducing long-wavelength corrugation from 150 to 160 mm.The feedback vibration induced by short-wavelength corrugation irregularities only serves to increase the depth of the short-wavelength corrugation itself and does not induce corrugation with a new wavelength.