Nonlinear Dynamic of Curved Railway Tracks in Three-Dimensional Space

3rd International Conference on Mechanical Engineering and Automation Science

机械制造;无线电电子学

Liu, X.^1 ; Ngamkhanong, C.^1,2 ; Kaewunruen, S.^1,2

Department of Civil Engineering, School of Engineering, University of Birmingham, Birmingham

B15 2TT, United Kingdom^1

Birmingham Centre for Railway Research and Education, University of Birmingham, Birmingham

B15 2TT, United Kingdom^2

关键词: Dynamic assessment;    Noise problems;    State of the art;    Systems thinking;    Three dimensional space;    Track dynamics;    Track structure;    Urban environments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/280/1/012036/pdf
DOI  :  10.1088/1757-899X/280/1/012036

来源: IOP

【 摘 要 】

On curved tracks, high-pitch noise pollution can often be a considerable concern of rail asset owners, commuters, and people living or working along the rail corridor. Inevitably, wheel/rail interface can cause a traveling source of sound and vibration, which spread over a long distance of rail network. The sound and vibration can be in various forms and spectra. The undesirable sound and vibration on curves is often called 'noise,' includes flanging and squealing noises. This paper focuses on the squeal noise phenomena on curved tracks located in urban environments. It highlights the effect of curve radii on lateral track dynamics. It is important to note that rail freight curve noises, especially for curve squeals, can be observed almost everywhere and every type of track structures. The most pressing noise appears at sharper curved tracks where excessive lateral wheel/rail dynamics resonate with falling friction states, generating a tonal noise problem, so-call 'squeal'. Many researchers have carried out measurements and simulations to understand the actual root causes of the squeal noise. Most researchers believe that wheel resonance over falling friction is the main cause, whilst a few others think that dynamic mode coupling of wheel and rail may also cause the squeal. Therefore, this paper is devoted to systems thinking the approach and dynamic assessment in resolving railway curve noise problems. The simulations of railway tracks with different curve radii will be carried out to develop state-of-the-art understanding into lateral track dynamics, including rail dynamics, cant dynamics, gauge dynamics and overall track responses.