Author
Zefeng Wen
Bio: Zefeng Wen is an academic researcher from Southwest Jiaotong University. The author has contributed to research in topics: Track (rail transport) & Bogie. The author has an hindex of 26, co-authored 83 publications receiving 1662 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this article, a finite element code ANSYS/LS-DYNA is used to simulate the wheel/rail contact-impact behavior at rail joint region, and the implicit and explicit finite element methods have been couple to analyze wheel and rail impact process.
120 citations
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TL;DR: In this article, the effect of rail corrugation with different depths and wavelengths on the dynamical behavior of a passenger car and a curved track is investigated, and the evolution of initial corrugations with different wavelengths is investigated.
96 citations
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TL;DR: In this article, a finite element analysis was conducted to study dynamic elastic-plastic stress when a wheel passes a rail joint with height difference between the two sides of a gap.
75 citations
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TL;DR: In this article, a 3D dynamic model of a high-speed train coupled with a flexible ballast track is developed and is presented in this model, each vehicle is modeled as a 42 degrees of freedom multi-body system, which takes into consideration the nonlinear dynamic characteristics of the suspensions.
Abstract: A 3D dynamic model of a high-speed train coupled with a flexible ballast track is developed and is presented in this study. In this model, each vehicle is modeled as a 42 degrees of freedom multi-body system, which takes into consideration the nonlinear dynamic characteristics of the suspensions. A detailed inter-vehicle connection model including nonlinear couplers and inter-vehicle dampers, and the linear tight-lock vestibule diaphragm is established to simulate the effect of the end connections of neighboring vehicles on dynamic behavior. The track is modeled as a traditional three-layer discrete elastic support model. The rails are assumed to be Timoshenko beams supported by discrete sleepers. Each sleeper is treated as an Euler beam and the ballast bed is replaced by equivalent rigid ballast bodies. The reliability of the present model is then validated through a detailed numerical simulation comparison with the commercial software SIMPACK, with the effect of the track flexibility on the train/track interaction being analyzed simultaneously. The proposed model is finally applied to investigate the difference between dynamic performances obtained using the entire-train/track model (TTM) and the single-vehicle/track model (VTM). Several key dynamic performances, including vibration frequency response, ride comfort, and curving performance, calculated by the two types of dynamic models are compared and discussed. The numerical results show that there is a significant difference between the dynamic behaviors obtained by VTM and TTM, and that inter-vehicle connections have an important influence on the dynamic behavior of high-speed vehicles.
70 citations
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TL;DR: In this article, a numerical model for dynamic vehicle-track interaction at rail welds with longitudinal surface irregularity is presented, and the model is applied to calculate the dynamic wheel-rail contact forces and the sizes and locations of the contact areas.
70 citations
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TL;DR: Train-track-bridge dynamic interaction is a fundamental concern in the field of railway engineering, which plays an extremely important role in the optimal design of railway bridges, especially in this article.
Abstract: Train–track–bridge dynamic interaction is a fundamental concern in the field of railway engineering, which plays an extremely important role in the optimal design of railway bridges, especially in ...
222 citations
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TL;DR: In this paper, the effects of a number of contaminants, such as oil, dry and wet leaves and sand, on wheel/rail adhesion were investigated using a twin disc simulation.
158 citations
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TL;DR: In this paper, typical wear behaviors of representative materials of metallic alloys, ceramics, polymeric materials, and composites are reviewed in relation to their friction behaviors, and modeling for the wear prediction is outlined.
157 citations
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TL;DR: In this article, the track technical state can be assessed with the aid of axle box acceleration measurements, which can indicate short track defects like squats, welds with poor finishing quality, insulated joints, corrugation, etc.
153 citations
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17 Nov 2020TL;DR: This paper attempts to provide a comprehensive review on PHM domain and discusses important issues on uncertainty quantification, implementation aspects next to prognostics feature and tool evaluation, and previous and on-going research in high-speed train bogies to highlight problems faced in train industry.
Abstract: In literature, prognostics and health management (PHM) systems have been studied by many researchers from many different engineering fields to increase system reliability, availability, safety and to reduce the maintenance cost of engineering assets. Many works conducted in PHM research concentrate on designing robust and accurate models to assess the health state of components for particular applications to support decision making. Models which involve mathematical interpretations, assumptions and approximations make PHM hard to understand and implement in real world applications, especially by maintenance practitioners in industry. Prior knowledge to implement PHM in complex systems is crucial to building highly reliable systems. To fill this gap and motivate industry practitioners, this paper attempts to provide a comprehensive review on PHM domain and discusses important issues on uncertainty quantification, implementation aspects next to prognostics feature and tool evaluation. In this paper, PHM implementation steps consists of; (1) critical component analysis, (2) appropriate sensor selection for condition monitoring (CM), (3) prognostics feature evaluation under data analysis and (4) prognostics methodology and tool evaluation matrices derived from PHM literature. Besides PHM implementation aspects, this paper also reviews previous and on-going research in high-speed train bogies to highlight problems faced in train industry and emphasize the significance of PHM for further investigations.
137 citations