Abstract
The polygonal wear around the wheel circumference could pose highly adverse influences on the wheel/rail interactions and thereby the performance of the vehicle system. In this study, the effects of wheel polygonalisation on the dynamic responses of a freight wagon are investigated through development and simulations of a comprehensive coupled vehicle-track dynamic model. The model integrates flexible ballasted track and wheelsets subsystem models so as to account for elastic deformations caused by impact loads induced by the wheel polygonalisation. Subsequently, the vehicles with low-order polygonal wear, whether in empty or loaded conditions, are simulated at different speeds considering different amplitudes and harmonic orders of the wheel polygonalisation and thus the mapping relation between wheel/rail impact force and wheel polygonalisation is obtained. The results reveal that the low-order wheel polygonalisation except 1st order and 3rd order can give rise to high-frequency impact loads at the wheel/rail interface and excite 1st-bend modes of the wheelset and “P2 resonance” leading to high-magnitude wheel/rail contact force at the corresponding speed.
Highlights
Wheel polygonalisation is a form of wheel circumferential uneven wear, referred to as wheel polygonalisation or wheel corrugation, which generally exists in vehicles [1].e periodic circumferential wear has been associated with high magnitudes of high-frequency impact loads at the wheel/rail interface, which contribute to undesired dynamic responses and reduced fatigue lives of the vehicle-track substructures, especially with higher axle loads and high-speed operations [2].Owing to highly adverse effects of wheel polygonalisation, considerable efforts have been made to understand the mechanisms leading to periodic circumferential defects in railway wheels
E periodic circumferential wear has been associated with high magnitudes of high-frequency impact loads at the wheel/rail interface, which contribute to undesired dynamic responses and reduced fatigue lives of the vehicle-track substructures, especially with higher axle loads and high-speed operations [2]
Liu and Zhai [7] investigated vertical dynamic wheel/rail interaction resulting from two types of out-of-round wheels at high speeds by a vertical vehicletrack coupled dynamics model. e results demonstrate the influence of the out-of-round wheel on vehicle system is mainly related to the wheelset vibration and derivative of wheel radial deviations can effectively reflect dynamic wheel/rail contact force
Summary
Wheel polygonalisation is a form of wheel circumferential uneven wear, referred to as wheel polygonalisation or wheel corrugation, which generally exists in vehicles [1]. E periodic circumferential wear has been associated with high magnitudes of high-frequency impact loads at the wheel/rail interface, which contribute to undesired dynamic responses and reduced fatigue lives of the vehicle-track substructures, especially with higher axle loads and high-speed operations [2]. E effects of wheel polygonalisation on the dynamic responses of a high-speed rail vehicle are investigated through development and simulations of a comprehensive coupled vehicle-track dynamic model by Wu [11]. E results suggested that the high-order wheel polygonalisation could give rise to highfrequency impact loads at the wheel/rail interface and excited some of the vibration modes of the wheelset leading to high-magnitude axle box acceleration and dynamic stress in the wheelset axle. A comprehensive coupled vehicle-track dynamic model of freight wagon is established so as to investigate the effects of low-order wheel polygonalisation on wheel/rail contact force. A comprehensive coupled vehicle-track dynamic model of freight wagon is established so as to investigate the effects of low-order wheel polygonalisation on wheel/rail contact force. e model integrates flexible ballasted track and wheelset subsystem models so as to account for elastic deformations that may occur in the presence of repetitive impact loads induced by the wheel polygonalisation at the wheel/rail interface. e effects of amplitude and harmonic order of wheel polygonal wear are subsequently investigated and the corresponding mapping relations are obtained to detect polygonal wheel by trackside detection
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