The rigid–flexible coupling dynamic model and response analysis of bearing–wheel–rail system under track irregularity

Abstract

As the main bearing components of vehicle wheel/rail systems, railway bearings take on the main load of wheel/rail system. These bearings can be easily damaged after a long-term load, which causes vibrations and significant deterioration of force distribution and directly affects the driving stability of the locomotive. Current systems available for modeling the dynamics of wheel/rail systems rarely consider nonlinear contact load bearing, which causes errors in the calculation of wheel/rail system dynamics. According to the bearing structure characteristics and working features of a specific system, this paper thoroughly evaluates the flexible deformation of shaft and bearing, time-varying nonlinear contact load, track irregularity, and bearing to establish a wheel/rail system coupling dynamics model. Then, based on the coupling dynamics theoretical model, the wheel/rail system’s coupling nonlinear dynamic characteristics are studied under random load. Then, this theoretical model of the wheel–bearing–rail system dynamics is verified using the railway bearing as an example. Finally, the model is applied to the process of rail/wheel low force design. Results show that under irregular stimulation, the maximum contact load increased by 71.2% and the maximum contact stress increased by 19.6%. After moderate wear, the wheel/rail system vibration and loading condition deteriorate rapidly. Under the low rail/wheel force, the wheel tread and diameter had significant effects on wheel/rail contact force distribution. The rail specifications are found to affect the wheel/rail system’s vibration significantly. This paper has important theoretical value and practical significance for developing reliable railway bearings and wheel/rail systems with good static/dynamic characteristics that can withstand dynamic impact load.

Thermal EHL Characteristics Investigation on Axle Box Bearings of Railway Vehicle Based on Slicing Method

“…Finally, the wheelset transfers the load to the track, while the track irregularity affects the vehicle wheelset. On the basis of working principle, the force distribution of the bearing-wheel-rail system [23] is shown in Figure 1. k cy and c cy are the equivalent radial-stiffness and radialdamping of adapters; F v1 (t) and F v2 (t) are the dynamic excitation on the right adapter and left adapter, and F r1 and F r2 are the contact forces of the axle box bearings.…”

“…α i , α e , and α f are the contact angle, the roller cone angle, and the flange angle, respectively. e radial balance equation of two row tapered roller bearings [23]:…”

Axle Box Resonance Excitation Model Based on Wheelset Polygon and Its Resonance Characteristic Analysis in High‐Speed Train

“…Huo et al. [ 16 ] comprehensively considered the effects of flexible deformation of the axle and bearing, time‐varying nonlinear contact load of wheel‐rail and bearing, and track irregularity. They established a wheel–rail coupling dynamic model and studied the coupling nonlinear dynamic characteristics and vibration response characteristics of the wheel–rail system under a random load.…”

Vibration responses of rotor systems in diesel multiple units under dynamic spatial misalignments and base motions

“…Gu and Choi [6] studied the dynamic response of rail support, and indicated that the difference between natural frequencies of the train suspension and track means that the dynamic response of the track was largely independent of the dynamic properties of the trains. A new model [7], considering flexible deflection of shaft and bearing, time-varying nonlinear contact and track irregularity was established, and the author found that the dynamic responses of the wheelset-bearing system were considerably affected by track irregularities.…”