Numerical Investigation on Wheel-Rail Dynamic Vibration Excited by Rail Spalling in High-Speed Railway

Abstract

Spalling in contact surface of rail is a typical form of rolling contact fatigue, which is a difficult problem to solve in railway. Once the spalling occurs in the rail, the wheel-rail dynamic interaction will become more severe. The wheel-rail dynamic interaction is investigated based on the theory of vehicle-track coupled dynamics in this paper, where the excitation modes of the rail spalling failure are taken into consideration for high-speed wheel-rail system. A modified excitation model of rail spalling failure is proposed. It can enable the investigations on two kinds of excitation modes in wheel-rail system due to the rail spalling, including the pulse and the harmonic excitation modes. The excitation mode can be determined by the ratio of the spalling length to its critical length. Thus, the characteristics of wheel-rail dynamic vibration excited by two kinds of excitation are simulated in detail. Consequently, the limited value of the spalling length is suggested for high-speed railway.

Effect of Lateral Stiffness of Secondary Suspensions on Heavy-Haul Locomotives Stability During Braking Based on Simulation and Experiment

“…Figure 6 shows the dynamic model of 13A/QKX100 coupler and draft gear system. It should be pointed that the position errors of coupler and draft gear systems were considered in the simulation model according to the field measurements, as listed in Table 2 (Wang et al 2016a(Wang et al , 2016b.…”

“…Derailments caused by locomotives instability may occur with the increasing of the train tonnage and running speed (Geike 2007;Wu et al 2014;Guo et al 2016). Scholars have conducted many studies on the longitudinal dynamics of heavy-haul trains, the wheel-rail dynamic vibration, the wagon connection model, the influence of the coupler stability on running safety of heavy-haul locomo-tives (Cole et al 2012;Cole, Sun 2006;Wang et al 2009Wang et al , 2015Wang et al , 2016aWang et al , 2016bBelforte et al 2008;Nasr, Mohammadi 2010;Simson, Cole 2008). However, these studies did not consider the heavy-haul locomotive stability, its effect on dynamic performance and running safety when the locomotive sustains a severe longitudinal compressive force.…”

Investigation of Concrete Base‐Roadbed Surface Contact Variation‐Induced Vibration Characteristics of Vehicle‐Slab Track‐Subgrade System considering Fluid‐Solid Interaction

“…For example, rail pad properties [10] on dynamic performance of railway track were analyzed numerically. e wheel-rail dynamic interaction was investigated based on the theory of vehicle-track coupled dynamics with a modified excitation model of rail spalling failure proposed [11]. In order to optimize slab railway tracks, a comprehensive analysis of the shakedown limit load of nonballasted railway tracks was carried out using an efficient numerical model [12].…”

Effect of Surface Hardening on Dynamic Frictional Rolling Contact Behavior and Degradation of Corrugated Rail

“…When in contact with a corrugated rail, the wheel resonates at its surface, and the resonant vibration may occur within an inherent frequency range, causing a high-frequency rail vibration and worsening wheel-rail damage, leading to higher frequency vibrations along the rail and degradation of fastener during operation (for example, between January and March 2017, elastic bar cracks were discovered at 103 points, with 6 elastic bars broken down and 12 anchor bolts fractured). Moreover, rail corrugation poses a serious threat to the safety of trains [1,2]. At the moment, rail grinding can effectively mitigate rail corrugation, but frequent grinding significantly increases the cost of rail maintenance.…”