Research of Wheel-Rail Coupled Vibration Excited by Wheel Polygon for Heavy-Haul Locomotive

Abstract

In order to study the wheel-rail impact vibration of the heavy-haul locomotive with 25t axle-load, the typical wheel polygonal data for different running distance were field measured. The radial circular run-out, radial geometric deviation and harmonic composition of wheel polygon were analyzed. The vehicle-track vertical coupling dynamics model was established and verified by comparing the vibration test results and numerical simulation results. The research results show that, with the increase of service mileage, the wheel polygon wear deteriorates, leading to the violent wheel-rail dynamic interaction. The impact force caused by the wheel polygon has a great influence on the primary suspension force, and has almost no influence on the secondary suspension force. The maximum acceleration of the car body, frame and wheelset caused by the wheel polygon is 3.148g, 0.177g and 0.00149g, so the vibration attenuation phenomenon of the locomotive is very obvious. The maximum acceleration of the rail, sleeper, ballast is 3.38g, 2.81g, 2.1g, therefore, the track system vibration attenuation is weaker. The main frequency of the vibration is 30Hz, which corresponds to the 7th-order harmonics, the result is consistent with the analysis of the wheel polygonal harmonic components.