Research on the the influencing factors of abnormal vibration of conventional railway on curve during operation period
In order to analyze the abnormal shaking of speed level of 160 km/h curve section of a conventional railway during operation period,the wheel-rail profile of the rolling section was measured.By analyzing the time-frequency characteristics of the measured vehicle acceleration and track geometric irregularity data of the abnormal vehicle vibration section,and combining with the establishment of a vehicle-ballast track coupled dynamic model,the effects of wheel-rail matching characteristics and unbalanced superelevation conditions on the lateral stability of vehicles on curve were studied.The results show that the lateral acceleration of the vehicle in the abnormal vibration curve section has a significant periodic vibration with a large amplitude.The spatial frequency of the lateral acceleration vibration of the vehicle is 0.024 m-1,and the corresponding wavelength is 42 m.The profile of the inner and outer rails in the abnormal vibration curve section is asymmetric,and the wear on the top surface and gauge angle of the outer rails is more severe.When matching the measured wheel profile,the wheel-rail contact points are more concentrated on the rail top surface.Compared with the LM&CHN60 profile,the lateral displacement of the wheelset is greater,and the periodic vibration of the wheelset and bogie is more obvious with measured profiles.The spatial frequency of the periodic vibration is 0.024 m-1,which is the same as the abnormal vehicle vibration frequency.The lateral force of the wheel axle significantly increases at a running speed of 60 km/h,and the derailment coefficient and wheel load reduction rate significantly increase at the operation speed of 160 km/h.Under the condition of a curve radius of 5 000 m and a superelevation of 25 mm,when the vehicle passes through the curve at speeds of 60 km/h and 160 km/h,it belongs to a serious state of unbalanced superelevation.The lateral acceleration vibration frequency of the vehicle is close to the hunting motion frequency of the bogie the wheelset,which significantly affects the dynamic response of the vehicle when passing through the curve.When the operating speed is 120 km/h,the overall dynamic response of the vehicle on the curved section is relatively small,which shows that appropriate deficient superelevation can help improve the vehicle curve passing capacity.Due to the limitations of curve parameters,it is recommended to give priority to reducing the running speed to reduce the vehicle dynamic response,while further improving the curve passing capacity by improving the wheel-rail matching relationship.
conventional railwayabnormal vehicle vibrationwheel-rail matchingunbalanced superelevationballast trackdynamic response on curve
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