75 Result(s)
within
Qi** Li
Automotive Engineering
Regional/Spatial Science
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Article
Open AccessFlow and sound fields of scaled high-speed trains with different coach numbers running in long tunnel
Segregated incompressible large eddy simulation and acoustic perturbation equations were used to obtain the flow field and sound field of 1:25 scale trains with three, six and eight coaches in a long tunnel, a...
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Article
Open AccessComputer vision-aided DEM study on the compaction characteristics of graded subgrade filler considering realistic coarse particle shapes
The compaction quality of subgrade filler strongly affects subgrade settlement. The main objective of this research is to analyze the macro- and micro-mechanical compaction characteristics of subgrade filler b...
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Article
Open AccessTrain-induced aerodynamic characteristics of vertical sound barriers influenced by several factors
Investigations into the aerodynamic properties of vertical sound barriers exposed to high-speed operations employ computational fluid dynamics. The primary focus of this research is to evaluate the influence o...
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Open AccessParametric investigation of railway fastenings into the formation and mitigation of short pitch corrugation
Short pitch corrugation has been a problem for railways worldwide over one century. In this paper, a parametric investigation of fastenings is conducted to understand the corrugation formation mechanism and ga...
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Article
Open AccessTraction power systems for electrified railways: evolution, state of the art, and future trends
Traction power systems (TPSs) play a vital role in the operation of electrified railways. The transformation of conventional railway TPSs to novel structures is not only a trend to promote the development of e...
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Article
Open AccessAnalysis of mesoscopic mechanical dynamic characteristics of ballast bed with under sleeper pads
The meso-dynamical behaviour of a high-speed rail ballast bed with under sleeper pads (USPs) was studied. The geometrically irregular refined discrete element model of the ballast particles was constructed usi...
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Article
Open AccessDynamic train dwell time forecasting: a hybrid approach to address the influence of passenger flow fluctuations
Train timetables and operations are defined by the train running time in sections, dwell time at stations, and headways between trains. Accurate estimation of these factors is essential to decision-making for ...
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Open AccessAn abnormal carbody swaying of intercity EMU train caused by low wheel–rail equivalent conicity and dam** force unloading of yaw damper
Low-frequency carbody swaying phenomenon often occurs to railway vehicles due to hunting instability, which seriously deteriorates the ride comfort of passengers. This paper investigates low-frequency carbody ...
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Article
Open AccessPrediction of high-speed train delay propagation based on causal text information
The delay-causing text data contain valuable information such as the specific reasons for the delay, location and time of the disturbance, which can provide an efficient support for the prediction of train del...
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Article
Open AccessElectrical characteristics of new three-phase traction power supply system for rail transit
A novel three-phase traction power supply system is proposed to eliminate the adverse effects caused by electric phase separation in catenary and accomplish a unifying manner of traction power supply for rail ...
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Article
Open AccessPantograph–catenary electrical contact system of high-speed railways: recent progress, challenges, and outlooks
As the unique power entrance, the pantograph–catenary electrical contact system maintains the efficiency and reliability of power transmission for the high-speed train. Along with the fast development of high-...
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Article
Open AccessA comprehensive review on coupling vibrations of train–bridge systems under external excitations
In recent years, high-speed railways in China have developed very rapidly, and the number and span of the railway bridges are kee** increasing. Meanwhile, frequent extreme disasters, such as strong winds, ea...
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Open AccessAn experimental study on the effects of friction modifiers on wheel–rail dynamic interactions with various angles of attack
By modifying friction to the desired level, the application of friction modifiers (FMs) has been considered as a promising emerging tool in the railway engineering for increasing braking/traction force in poor...
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Article
Open AccessExperimental investigation on vibration characteristics of the medium–low-speed maglev vehicle–turnout coupled system
The steel turnout is one of the key components in the medium–low-speed maglev line system. However, the vehicle under active control is prone to vehicle–turnout coupled vibration, and thus, it is necessary to ...
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Article
Open AccessPolyurethane grouting materials with different compositions for the treatment of mud pum** in ballastless track subgrade beds: properties and application effect
Mud pum** in subgrade beds under ballastless tracks will deteriorate the dynamic performance of infrastructure under railway lines, reduce the smoothness of the railway lines, and seriously affect the comfor...
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Article
Open AccessAerodynamic characteristics of a high-speed train crossing the wake of a bridge tower from moving model experiments
In a strong crosswind, the wake of a bridge tower will lead to an abrupt change of the aerodynamic forces acting on a vehicle passing through it, which may result in problems related to the transportation safe...
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Article
Open AccessExploration of the characteristics and trends of electric vehicle crashes: a case study in Norway
With the rapid growth of electric vehicles (EVs) in the past decade, many new traffic safety challenges are also emerging. With the crash data of Norway from 2011 to 2018, this study gives an overview of the s...
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Article
Open AccessNumerical simulation and optimization of aerodynamic uplift force of a high-speed pantograph
Aiming at the problem that aerodynamic uplift forces of the pantograph running in the knuckle-downstream and knuckle-upstream conditions are inconsistent, and their magnitudes do not satisfy the corresponding ...
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Article
Open AccessDynamic analysis of traction motor in a locomotive considering surface waviness on races of a motor bearing
The traction motor is the power source of the locomotive. If the surface waviness occurs on the races of the motor bearing, it will cause abnormal vibration and noise, accelerate fatigue and wear, and seriousl...
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Open AccessVibro-acoustic performance of steel–concrete composite and prestressed concrete box girders subjected to train excitations
Owning to good mechanical properties, steel–concrete composite (SCC) and prestressed concrete (PC) box girders are the types of elevated structures used most in urban rail transit. However, their vibro-acousti...
