ORCID Profile
0000-0001-7392-9468
Current Organisation
Queensland University of Technology
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Structural Engineering | Civil Geotechnical Engineering | Construction Engineering | Biomedical Engineering | Biomechanical Engineering | Automotive Engineering | Construction Materials | Manufacturing Engineering Not Elsewhere Classified | Road And Rail Transportation | Transport Engineering | Mechanical Engineering | Structural Engineering | Automotive Engineering | Mechanical Engineering | Data Security | Numerical Analysis
ANZSRC Socio-Economic Objective (SEO)
Civil Construction Design | Rail Infrastructure and Networks | Cement and Concrete Materials | Metals (e.g. Composites, Coatings, Bonding) | Construction processes | Road safety | Rail equipment | Other road transport | Expanding Knowledge in Technology | Computer software and services not elsewhere classified | Environmentally Sustainable Energy Activities not elsewhere classified | Cement and concrete materials | Transport not elsewhere classified | Computer hardware and electronic equipment not elsewhere classified |
Related Links
Publications
Studies on the existing in-plane shear equations of partially grouted reinforced masonry
Publisher: Informa UK Limited
Date: 09-2016
Discussion of “ Stress‐Strain Curves for Brick Masonry in Biaxial Compression ” by Krishna Naraine and Sachchidanand Sinha (June, 1992, Vol. 118, No. 6)
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-1994
A numerical model for the flexural analysis of short reinforced masonry columns including bond–slip
Publisher: Elsevier BV
Date: 03-2002
A Neutron Diffraction Investigation of Residual Stresses in Rail Ends after Severe Deformation of Rail Surfaces
Publisher: Trans Tech Publications, Ltd.
Date: 02-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.777.213
Abstract: Insulated rail joints (IRJs) are a primary component of the rail track safety and signalling systems. Rails are supported by two fishplates which are fastened by bolts and nuts and, with the support of sleepers and track ballast, form an integrated assembly. IRJ failure can result from progressive defects, the propagation of which is influenced by residual stresses in the rail. Residual stresses change significantly during service due to the complex deformation and damage effects associated with wheel rolling, sliding and impact. IRJ failures can occur when metal flows over the insulated rail gap (typically 6-8 mm width), breaks the electrically isolated section of track and results in malfunction of the track signalling system. In this investigation, residual stress measurements were obtained from rail-ends which had undergone controlled amounts of surface plastic deformation using a full scale wheel-on-track simulation test rig. Results were compared with those obtained from similar investigations performed on rail ends associated with ex-service IRJs. Residual stresses were measured by neutron diffraction at the Australian Nuclear Science and Technology Organisation (ANSTO). Measurements with constant gauge volume 3x3x3 mm 3 were carried in the central vertical plane on 5mm thick sliced rail s les cut by an electric discharge machine (EDM). Stress evolution at the rail ends was found to exhibit characteristics similar to those of the ex-service rails, with a compressive zone of 5mm deep that is counterbalanced by a tension zone beneath, extending to a depth of around 15mm. However, in contrast to the ex-service rails, the type of stress distribution in the test-rig deformed s les was apparently different due to the localization of load under the particular test conditions. In the latter, in contrast with clear stress evolution, there was no obvious evolution of d 0 . Since d 0 reflects rather long-term accumulation of crystal lattice damage and microstructural changes due to service load, the loading history of the test rig s les has not reached the same level as the ex-service rails. It is concluded that the wheel-on-rail simulation rig provides the potential capability for testing the wheel-rail rolling contact conditions in rails, rail ends and insulated rail joints.
Correlation between the performance of solid masonry prisms and wallettes under compression
Publisher: Elsevier BV
Date: 03-2019
Shear in Reinforced and Unreinforced Masonry: Response, Design and Construction
Publisher: Elsevier BV
Date: 2011
Cyclic plastic deformation characteristics of subgrade under moving train wheel load
Publisher: The Japanese Geotechnical Society
Date: 2016
Minimization of railhead edge stresses through shape optimization
Publisher: Informa UK Limited
Date: 09-2013
A passive road-rail crossing design to minimise wheel-rail contact failure risk under frontal collision of trains onto stuck trucks
Publisher: Elsevier BV
Date: 10-2017
Biaxial Stress‐strain Relations for Brick Masonry
Publisher: American Society of Civil Engineers (ASCE)
Date: 05-0003
Design Expressions for the In-Plane Shear Capacity of Confined Masonry Shear Walls Containing Squat Panels
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2016
Dynamic response of the train–track–bridge system subjected to derailment impacts
Publisher: Informa UK Limited
Date: 09-11-2017
Assessing the effects of track input on the response of insulated rail joints using field experiments
Publisher: SAGE Publications
Date: 13-09-2013
Abstract: Manufacturers of insulated rail joints (IRJs) have to follow the quality assurance regime stipulated in the national design standards unfortunately, IRJs still exhibit a very low and highly variable service life. It is widely believed that the service life of IRJs is affected by the track input under the passage of loaded wheels however, there is a paucity of literature with regard to the actual mechanical behaviour of IRJs in the track. An extensive field test was, therefore, conducted on an in-service heavy haul corridor in Australia with the specific aim of understanding the effect of the track input on the response of the IRJs. Data on the wheel–rail force, rail/joint-bar strain, sleeper acceleration and ballast pressure signatures in the time domain were determined from the experiment. This data was subsequently systematically analysed to compare the relative structural merits of two IRJs resting on different sleeper spaces and a reference continuous rail subjected to similar real-life coal traffic loading.
Structural adequacy assessment of a disused flat bottom rail wagon as road bridge deck
Publisher: Elsevier BV
Date: 05-2011
Out-of-plane deformation and failure of masonry walls with various forms of reinforcement
Publisher: Elsevier BV
Date: 04-2016
An Inertial Reference Frame Method for the Simulation of the Effect of Longitudinal Force to the Dynamics of Railway Wheelsets
Publisher: Springer Science and Business Media LLC
Date: 04-05-2006
Flexural behaviour of bonded-bolted butt joints due to bolt looseness
Publisher: Elsevier BV
Date: 08-2007
Effectiveness of Two Forms of Grouted Reinforced Confinement Methods to Hollow Concrete Masonry Panels
Publisher: American Society of Civil Engineers (ASCE)
Date: 12-2015
A method for tracking internal crack propagation in railhead
Publisher: Springer Science and Business Media LLC
Date: 12-2004
Dynamics of railway wagons subjected to braking torques on defective tracks
Publisher: Informa UK Limited
Date: 2012
A non-local transient-gradient enhanced damage modelling method incorporating variable Poisson’s ratio for brittle bi-material composites
Publisher: Elsevier BV
Date: 04-2020
Impact forces at dipped rail joints
Publisher: SAGE Publications
Date: 11-06-2014
Abstract: Impact forces develop at the wheel/rail interface due to the presence of defects in the running surface of the wheel and/or the railhead. This paper reports on wheel impacts, caused by permanently dipped rail joints, that are characterised by high-frequency impact forces generated by high lifications of the static load that occur for a very short duration ( P 1 forces), followed by relatively low frequency, lower litude forces ( P 2 forces) that occur for a longer duration. These impact forces are affected by the design of components adjacent to the wheel and rail, namely the bogie’s primary suspension and rail seat pads the influences of stiffness and d ing characteristics of these components are investigated. A modified three-dimensional simulation model of the dynamics of the wagon/track system that includes defects in the track is created and is used to obtain the time series of the impact force. This is converted into impact force factors that are compared with a set of field-measured data reported in the literature. A simplified equation for the determination of impact force factors due to dipped rail joints is also proposed and validated.
Service Condition of Railroad Corridors around the Insulated Rail Joints
Publisher: American Society of Civil Engineers (ASCE)
Date: 06-2013
A three-dimensional model for the lateral and vertical dynamics of wagon-track systems
Publisher: SAGE Publications
Date: 2003
DOI: 10.1243/095440903762727339
Abstract: Lateral and vertical dynamics of the wagon and track affects the maintenance and safety of the heavy haul railway operation. With a view to understanding this aspect comprehensively, a three-dimensional wagon-track system dynamics (WTSD) model is developed and presented. The model consists of a full wagon with 37 degrees of freedom (DOF), a four-layer track with discretely supported rails and a wheel-rail interface representing Kalker's creep and Hertzian contact parameters. The model has been validated using two sets of field data: one dealing with vertical impact due to the flat wheel and the other dealing with lateral hunting. The effect of detailed track modelling on lateral hunting is discussed, and the capability of the three-dimensional WTSD model in predicting lateral impact is demonstrated.
Characterisation of polymer cement mortar composites containing carbon fibre or auxetic fabric overlays and inserts under flexure
Publisher: Elsevier BV
Date: 11-2019
Effects of Principal Stress Axis Rotation on Unsaturated Rail Track Foundation Deterioration
Publisher: Elsevier BV
Date: 2016
Optimisation of railhead profiles for curved tracks using improved non-uniform rational B-splines and measured profiles
Publisher: Elsevier BV
Date: 2019
Characterisation of thin layer polymer cement mortared concrete masonry bond
Publisher: Elsevier BV
Date: 05-2015
Plane hybrid stress elements for 3D analysis of moderately thick solids subjected to loading symmetric to midsurface
Publisher: Elsevier BV
Date: 04-2007
Impact mitigation of masonry walls with carbon fibre and Auxetic fibre composite renders – A numerical study
Publisher: Elsevier BV
Date: 12-2020
Sub-modelling for the ratchetting failure of insulated rail joints
Publisher: Elsevier BV
Date: 10-2013
Serviceability Assessment of Masonry Arch Bridges Using Digital Image Correlation
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2019
Prediction of masonry compressive behaviour using a damage mechanics inspired modelling method
Publisher: Elsevier BV
Date: 04-2016
Field studies on sleeper deflection and ballast pressure in heavy haul track
Publisher: Informa UK Limited
Date: 07-03-2018
Numerical simulation of axially loaded concrete columns under transverse impact and vulnerability assessment
Publisher: Elsevier BV
Date: 11-2010
Masonry Walls under Combined In-Plane and Out-of-Plane Loadings
Publisher: American Society of Civil Engineers (ASCE)
Date: 02-2018
Bearing strength of concrete for difference heights of concrete blocks
Publisher: IOP Publishing
Date: 08-11-2018
Evaluation of the properties of railway capping layer soil
Publisher: Elsevier BV
Date: 09-2008
Experimental Investigation of Wheel/Rail Rolling Contact at Railhead Edge
Publisher: Springer Science and Business Media LLC
Date: 11-12-2012
A generalised damage model for masonry under compression
Publisher: SAGE Publications
Date: 29-06-2016
Abstract: A generalised model based on damage mechanics for predicting the response of masonry subjected to compression is presented. The model accounts for the behaviour of the constituents of the masonry, viz., the units, the mortar and the unit–mortar interfaces in this paper, the unit–mortar interfaces and the mortar layers have been treated as a homogenised continuum. The principles of damage mechanics coupled with limiting damage surfaces have been used to simulate the behaviour of the masonry constituents. The novelty is the use of a non-linear, progressively stiffening stress–strain curve to simulate the viscoelastic behaviour of the homogenised mortar–interface (for conventional masonry) or dry surface–interface (for dry-stack masonry) layers until a threshold strain is reached. Beyond the threshold strain, their behaviour is assumed to have changed to progressive softening common for concrete like materials. The damage model for compression and tension due to progressive stiffening and softening criteria respectively have been formulated for the masonry constituents. The parameters which characterise the tensile and compressive behaviours, the volumetric change and the damage behaviour of the masonry constituents have been calibrated using some available experimental data in the literature. The model is shown to predict the average compressive strength and stress–strain behaviour of the masonry prisms appropriately. The model is capable of capturing the behaviour including appropriate stiffness degradation and post peak softening that are comparable to the experimental predictions reported in the literature for various types of masonry.
Experimental Investigation on Lateral Impact Response of Concrete-Filled Double-Skin Tube Columns Using Horizontal-Impact-Testing System
Publisher: Springer Science and Business Media LLC
Date: 28-03-2016
An explicit finite element modelling method for masonry walls under out-of-plane loading
Publisher: Elsevier BV
Date: 04-2016
Frontal collision of trains onto obliquely stuck road trucks at level crossings: Derailment mechanisms and simulation
Publisher: Elsevier BV
Date: 02-2017
Modelling and analysis of the crush zone of a typical Australian passenger train
Publisher: Informa UK Limited
Date: 07-2012
Editorial: It is time for the railway industry to reinvent itself
Publisher: Informa UK Limited
Date: 03-07-2017
Performance of square and inclined insulated rail joints based on field strain measurements
Publisher: SAGE Publications
Date: 15-08-2011
Abstract: Insulated rail joints (IRJs) possess lower bending stiffness across the gap containing insulating endpost and hence are subjected to wheel impact. IRJs are either square cut or inclined cut to the longitudinal axis of the rails in a vertical plane. It is generally claimed that the inclined cut IRJs outperform the square cut IRJs however, there is a paucity of literature with regard to the relative structural merits of these two designs. This article presents comparative studies of the structural response of these two IRJs to the passage of wheels based on continuously acquired field data from joints strain-gauged closer to the source of impact. Strain signatures are presented in time, frequency, and wavelet domains and the peak vertical and shear strains are systematically employed to examine the relative structural merits of the two IRJs subjected to similar real-life loading. It is shown that the inclined IRJs resist the wheel load with higher peak shear strains and lower peak vertical strains than that of the square IRJs.
Wheelset skid in railway bogies
Publisher: SAGE Publications
Date: 03-2007
Abstract: Skid of wheelsets leads to uncontrolled severe dynamics of bogies including derailment potential and damage to the running surfaces of the wheel and railhead. Simulation of wheelset skid would enhance the understanding of the skid mechanism and improve the level of safety. To effectively simulate bogie skid, the wheelsets should be modelled incorporating pitch degree of freedom. Such a model, based on a fixed inertial frame reference system, has been recently developed by the first author and is used in this paper to examine the skid of a simplified bogie containing two wheelsets and a bogie frame connected through spring-d er system. The current model accepts braking/traction torque as a primary input and calculates the longitudinal speed profile, acceleration, and distance travelled as a natural process. The calculated results have been validated using VAMPIRE where possible. The ability of the current model in predicting lateral dynamics while subjected to longitudinal skid is demonstrated through numerical ex les - a feature that could not readily be predicted by most commercial wagon dynamics packages.
A dynamic model for the vertical interaction of the rail track and wagon system
Publisher: Elsevier BV
Date: 03-2002
Effects of structure-related parameters on the response of concrete-filled double-skin steel tube columns to lateral impact
Publisher: Elsevier BV
Date: 11-2016
Experimental studies on the performance of rail joints with modified wheel/railhead contact
Publisher: SAGE Publications
Date: 29-07-2013
Abstract: Rail joints are provided with a gap to account for thermal movement and to maintain electrical insulation for the control of signals and/or broken rail detection circuits. The gap in the rail joint is regarded as a source of significant problems for the rail industry since it leads to a very short rail service life compared with other track components due to the various, and difficult to predict, failure modes – thus increasing the risk for train operations. Many attempts to improve the life of rail joints have led to a large number of patents around the world notable attempts include strengthening through larger-sized joint bars, an increased number of bolts and the use of high yield materials. Unfortunately, no design to date has shown the ability to prolong the life of the rail joints to values close to those for continuously welded rail (CWR). This paper reports the results of a fundamental study that has revealed that the wheel contact at the free edge of the railhead is a major problem since it generates a singularity in the contact pressure and railhead stresses. A design was therefore developed using an optimisation framework that prevents wheel contact at the railhead edge. Finite element modelling of the design has shown that the contact pressure and railhead stress singularities are eliminated, thus increasing the potential to work as effectively as a CWR that does not have a geometric gap. An experimental validation of the finite element results is presented through an innovative non-contact measurement of strains. Some practical issues related to grinding rails to the optimal design are also discussed.
Interfacial transition zone modelling for characterisation of masonry under biaxial stresses
Publisher: Elsevier BV
Date: 07-2020
Efficient solution of multiple cracks in great number using eigen COD boundary integral equations with iteration procedure
Publisher: Elsevier BV
Date: 03-2013
Dynamics of Tire Crossing on a Gapped Road Surface
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2018
Effects of load-related parameters on the response of concrete-filled double-skin steel tube columns subjected to lateral impact
Publisher: Elsevier BV
Date: 11-2017
A non-linear interface element model for thin layer high adhesive mortared masonry
Publisher: Elsevier BV
Date: 11-2014
A nonlinear damage accumulation model for shakedown failure
Publisher: Elsevier BV
Date: 08-2007
Sleeper embedded insulated rail joints for minimising the number of modes of failure
Publisher: Elsevier BV
Date: 06-2017
Computer analysis of impact behavior of concrete filled steel tube columns
Publisher: Elsevier BV
Date: 11-2015
Effect of Spacing of Reinforcement on the Behaviour of Partially Grouted Masonry Shear Walls
Publisher: SAGE Publications
Date: 04-2011
DOI: 10.1260/1369-4332.14.2.281
Abstract: Partially Grouted Reinforced Masonry (PGRM) shear walls perform well in places where the cyclonic wind pressure dominates the design. Their out-of-plane flexural performance is better understood than their inplane shear behaviour in particular, it is not clear whether the PGRM shear walls act as unreinforced masonry (URM) walls embedded with discrete reinforced grouted cores or as integral systems of reinforced masonry (RM) with wider spacing of reinforcement. With a view to understanding the inplane response of PGRM shear walls, ten full scale single leaf, clay block walls were constructed and tested under monotonic and cyclic inplane loading cases. It has been shown that where the spacing of the vertical reinforcement is less than 2000 mm, the walls behave as an integral system of RM for spacing greater than 2000 mm, the walls behave similar to URM with no significant benefit from the reinforced cores based on the displacement ductility and stiffness degradation factors derived from the complete lateral load – lateral displacement curves.
Flexural and shear bond characteristics of thin layer polymer cement mortared concrete masonry
Publisher: Elsevier BV
Date: 09-2013
Effects of principal stress axis rotation on cyclic deformation characteristics of rail track subgrade materials
Publisher: Elsevier BV
Date: 06-2017
On the in-plane shear response of the high bond strength concrete masonry walls
Publisher: Springer Science and Business Media LLC
Date: 28-08-2017
Wear damage of out-of-round wheels in rail wagons under braking
Publisher: Elsevier BV
Date: 08-2019
Three sides supported unreinforced masonry walls under multi-directional loading
Publisher: Elsevier BV
Date: 11-2018
Performance Testing of a Road Bridge Deck Containing Flat Rail Wagons
Publisher: American Society of Civil Engineers (ASCE)
Date: 04-2013
Failure of discontinuous railhead edges due to plastic strain accumulation
Publisher: Elsevier BV
Date: 09-2014
Dynamics of Wagon System Containing Out-of-Round Wheels Subject to Brake Torque
Publisher: Springer International Publishing
Date: 2020
Explicit finite element analysis of lightly reinforced masonry shear walls
Publisher: Elsevier BV
Date: 2008
Minimising lateral impact derailment potential at level crossings through guard rails
Publisher: Elsevier BV
Date: 07-2016
Field Measurement of Wheel-Rail Impact Force at Insulated Rail Joint
Publisher: Springer Science and Business Media LLC
Date: 15-10-2012
Identification of optimal size resources for a repetitive housing construction
Publisher: Emerald
Date: 04-2000
DOI: 10.1108/EB021158
Abstract: Deployment of optimal size of resources is a key issue in repetitive construction projects. This paper describes a simulation model based on queuing theory for the resource scheduling of a real repetitive housing project involving 320 dwelling units constructed in East Delhi, India. The optimal size of resources, defined as the minimum size required to keep the project duration a minimum, has been identified from the results of a series of sensitivity analyses in which the size of the resources was varied one at a time. The duration of the project, the period of utilization of the resources, and the queue length of activities waiting for service are also reported in this paper. It has been shown that reduction in size of resources is achievable without increasing the duration of the project and queue length of activities. Increase in the size of some specialised crews is also proved advantageous.
Characterisation and strategies for mitigation of the contact surface unevenness in dry-stack masonry
Publisher: Elsevier BV
Date: 04-2018
Effectiveness of a raised road: rail crossing for the safety of road vehicle occupants
Publisher: Elsevier BV
Date: 03-2019
Finite element analysis of the in-plane shear behaviour of masonry panels confined with reinforced grouted cores
Publisher: Elsevier BV
Date: 08-2014
Lateral impact derailment mechanisms, simulation and analysis
Publisher: Elsevier BV
Date: 08-2016
Hybrid Genetic Algorithm for Elimination of Severe Stress Concentration in Railhead Ends
Publisher: American Society of Civil Engineers (ASCE)
Date: 09-2015
A layered line element for the flexural analysis of cyclically loaded reinforced concrete beam–columns
Publisher: Elsevier BV
Date: 12-2000
Coupling of FE and EFG using collocation approach
Publisher: Elsevier BV
Date: 07-2002
Dynamic simulation of train–truck collision at level crossings
Publisher: Informa UK Limited
Date: 11-10-2016
Modelling cracks in arbitrarily shaped finite bodies by distribution of dislocation
Publisher: Elsevier BV
Date: 2004
Experimental evaluation of the effect of braking torque on bogie dynamics
Publisher: Inderscience Publishers
Date: 2007
Characterisation of cementitious polymer mortar – Auxetic foam composites
Publisher: Elsevier BV
Date: 08-2017
Non-destructive structural integrity assessment of a decommissioned rail wagon system
Publisher: Informa UK Limited
Date: 2015
Plane hybrid stress element method for 3D hollow bodies of uniform thickness
Publisher: Elsevier BV
Date: 02-2001
A hybrid-Trefftz element containing an elliptic hole
Publisher: Elsevier BV
Date: 10-2006
Residual Stresses in Rail-Ends from the in-Service Insulated Rail Joints Using Neutron Diffraction
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.768-769.741
Abstract: Insulated rail joints (IRJs) are an integral part of the rail track signaling system and pose significant maintenance and replacement costs due to their low and fluctuating service lives. Failure occurs mainly in rail head region, bolt- holes of fishplates and web-holes of the rails. Propagation of cracks is influenced by the evolution of internal residual stresses in rails during rail manufacturing (hot-rolling, roller-straightening, and head-hardening process), and during service, particularly in heavy rail haul freight systems where loads are high. In this investigation, rail head accumulated residual stresses were analysed using neutron diffraction at the Australian Nuclear Science and Technology Organisation (ANSTO). Two ex-service two head-hardened rail joints damaged under different loading were examined and results were compared with those obtained from an unused rail joint reference s le in order to differentiate the stresses developed during rail manufacturing and stresses accumulated during rail service. Neutron diffraction analyses were carried out on the s les in longitudinal, transverse and vertical directions, and on 5mm thick sliceed s les cut by Electric Discharge Machining (EDM). For the rail joints from the service line, irrespective of loading conditions and in-service times, results revealed similar depth profiles of stress distribution. Evolution of residual stress fields in rails due to service was also accompanied by evidence of larger material flow based on reflected light and scanning electron microscopy studies. Stress evolution in the vicinity of rail ends was characterised by a compressive layer, approximately 5 mm deep, and a tension zone located approximately 5- 15mm below the surfaces. A significant variation of d0 with depth near the top surface was detected and was attributed to decarburization in the top layer induced by cold work. Stress distributions observed in longitudinal slices of the two different deformed rail s les were found to be similar. For the undeformed rail, the stress distributions obtained could be attributed to variations associated with thermo-mechanical history of the rail.
Dynamics of railway wagons subjected to braking/traction torque
Publisher: Informa UK Limited
Date: 03-2009
Effects of joint thickness, adhesion and web shells to the face shell bedded concrete masonry loaded in compression
Publisher: Informa UK Limited
Date: 2013
Behaviour of thin layer mortared concrete masonry under combined shear and compression
Publisher: Informa UK Limited
Date: 02-01-2016
A Multi-Body Dynamic Model for Analysis of Localized Track Responses in Vicinity of Rail Discontinuities
Publisher: World Scientific Pub Co Pte Lt
Date: 11-2016
DOI: 10.1142/S0219455415500583
Abstract: Rail discontinuities are one of the main sources of wheel impact causing high levels of noise, vibration and stresses in railway track. Even though various multi-body train–track interaction models have been developed in the past decade, accurate modeling and analysis of the track dynamic behavior in the vicinity of rail discontinuities is rare in the literature. In this paper, formulation of a new explicit multi-body dynamic (MBD) model incorporating detailed wagon, wheel–rail subsystems and track containing a rail discontinuity (rail joint) is reported. The predictions of the localized track responses are validated using the data from two gapped rail joints in the field test. The validated model accurately determines the impact forces and dynamic responses. The simulation results provide valuable insight on the behavior of track in vicinity of a rail discontinuity, the sensitivity of the design parameters to the impact forces and the track dynamic responses currently unavailable in the literature.
Mode III fracture analysis by Trefftz boundary element method
Publisher: Springer Science and Business Media LLC
Date: 21-03-2007
Detection of Rail Wheel Flats using Wavelet Approaches
Publisher: SAGE Publications
Date: 06-2007
Abstract: Sudden application of heavy traction/braking torque induces flats in rail wagon wheelsets. Flat wheels generate high frequency impact forces sufficient to cause severe damage to the rail head surface. Early detection of flats would facilitate re-profiling the wheels before they cause serious damage to critical rail components, such as switches, crossings, and insulated rail joints. Although there are many sensors available in the market to detect/record wagon accelerations, there are no powerful signal processing tools readily available to detect the presence of wheel flats from the recorded acceleration signatures. This study presents two wavelet approaches to overcome the difficulties in the on-board monitoring and detection systems of rail wheel flats using vibration signals. Signal average techniques, wavelet local energy average concept, and wavelet decomposition are employed in this study. A Matlab-Simulink based dynamic simulation system capable of modeling the wheel flats and track irregularities is also developed for predicting the wheelset/bogie frame acceleration time series. An analysis of the numerical simulation results demonstrates that the methods proposed in this study are effective for the on-board monitoring of wheel flats of sizes smaller than the condemning limits.
Modelling the failure of thin layered mortar joints in masonry
Publisher: Elsevier BV
Date: 04-2013
Assessment of road-rail crossing collision derailments on curved tracks
Publisher: Informa UK Limited
Date: 03-04-2017
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