Search Results - "Nielsen, Jens C. O."

Condition Monitoring of Railway Crossing Geometry via Measured and Simulated Track Responses by Milosevic, Marko D G, Pålsson, Björn A, Nissen, Arne, Nielsen, Jens C O, Johansson, Håkan

“…This paper presents methods for continuous condition monitoring of railway switches and crossings (S&C, turnout) via sleeper-mounted accelerometers at the…”
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High-frequency vertical wheel–rail contact forces—Validation of a prediction model by field testing by Nielsen, Jens C.O.

“…The computer program DIFF, which is being developed at CHARMEC since the late 1980s, is used to simulate vertical vehicle–track interaction at high…”
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Under sleeper pads—Influence on dynamic train–track interaction by Johansson, Anders, Nielsen, Jens C.O., Bolmsvik, Rikard, Karlström, Anders, Lundén, Roger

“…The influence of under sleeper pads (USP) on dynamic train–track interaction is investigated in a parameter study. Two numerical models that are valid in…”
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Influence of railway wheel tread damage on wheel–rail impact loads and the durability of wheelsets by Maglio, Michele, Vernersson, Tore, Nielsen, Jens C. O., Ekberg, Anders, Kabo, Elena

“…Dynamic wheel–rail contact forces induced by a severe form of wheel tread damage have been measured by a wheel impact load detector during full-scale field…”
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Dynamic train–turnout interaction in an extended frequency range using a detailed model of track dynamics by Kassa, Elias, Nielsen, Jens C.O.

“…A time domain solution method for general three-dimensional dynamic interaction of train and turnout (switch and crossing) that accounts for excitation in an…”
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Simulation of wheel–rail contact and damage in switches & crossings by Johansson, Anders, Pålsson, Björn, Ekh, Magnus, Nielsen, Jens C.O., Ander, Mats K.A., Brouzoulis, Jim, Kassa, Elias

“…▶ Methodology for simulation of degradation of rail profiles in switches & crossings. ▶ Dynamic vehicle–track interaction considering stochastic input data. ▶…”
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Three-dimensional modelling of differential railway track settlement using a cycle domain constitutive model by Li, Xin, Ekh, Magnus, Nielsen, Jens C. O.

“…Summary A method for simulation of differential (spatially varying) track settlement in a ballasted railway track is presented. It employs a cycle domain…”
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Dynamic interaction between train and railway turnout: full-scale field test and validation of simulation models by Kassa, Elias, Nielsen, Jens C.O.

“…Results from an extensive field test performed in a UIC60-760-1:15 turnout on Svealandsbanan in Sweden are reported. Lateral and vertical wheel-rail contact…”
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Rail corrugation growth—Influence of powered wheelsets with wheel tread irregularities by Johansson, Anders, Nielsen, Jens C.O.

“…A multibody system model for simulation of general three-dimensional train-track interaction (accounting for frequencies up to several kHz) is used to…”
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Acceptance criterion for rail roughness level spectrum based on assessment of rolling contact fatigue and rolling noise by Nielsen, Jens C.O., Ekberg, Anders

“…▶ A reference short-pitch rail corrugation spectrum has been derived. ▶ Development of acceptance criterion regarding noise emission and RCF risk. ▶…”
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Railway track geometry degradation due to differential settlement of ballast/subgrade – Numerical prediction by an iterative procedure by Nielsen, Jens C.O., Li, Xin

“…An iterative procedure for numerical prediction of long-term degradation of railway track geometry (longitudinal level) due to accumulated differential…”
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Out-of-round railway wheels and polygonisation by Iwnicki, Simon, Nielsen, Jens C. O., Tao, Gongquan

“…Out-of-roundness in railway wheels, in particular polygonal wear resulting in regular, multi-lobed, out-of-round wheels, has become a significant problem in…”
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Simulation of vertical dynamic vehicle-track interaction using a two-dimensional slab track model by Aggestam, Emil, Nielsen, Jens C. O., Bolmsvik, Rikard

“…The vertical dynamic interaction between a railway vehicle and a slab track is simulated in the time domain using an extended state-space vector approach in…”
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Simulation of vertical dynamic vehicle–track interaction using a three-dimensional slab track model by Aggestam, Emil, Nielsen, Jens C.O.

“…•A parameterised 3D finite element model of slab track is developed.•Vehicle-track interaction is solved by a complex-valued modal superposition…”
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Multi-objective optimisation of transition zones between slab track and ballasted track using a genetic algorithm by Aggestam, Emil, Nielsen, Jens C.O.

“…The vertical dynamic vehicle–track interaction in a transition between ballasted track and slab track is simulated in the time domain using an extended…”
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Dynamic vehicle-track interaction and structural loading in a crossing panel - calibration and assessment of a model with a 3D representation of the crossing rail by Vilhelmson, Henrik, Pålsson, Björn A., Nielsen, Jens C. O., Ossberger, Uwe, Sehner, Michael, Loy, Harald

“…A three-dimensional (3D) finite element model of a railway crossing panel for use in multibody simulation (MBS) of dynamic vehicle-track interaction is…”
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Dynamic vehicle-track interaction and loading in a railway crossing panel - calibration of a structural track model to comprehensive field measurements by Pålsson, Björn A., Vilhelmson, Henrik, Ossberger, Uwe, Sehner, Michael, Milosevic, Marko D. G., Loy, Harald, Nielsen, Jens C. O.

“…This paper presents a finite element model of a railway crossing panel for use in multibody simulations (MBS). It is a two-layer track model with rails and…”
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Prediction of plastic deformation and wear in railway crossings – Comparing the performance of two rail steel grades by Skrypnyk, Rostyslav, Ekh, Magnus, Nielsen, Jens C.O., Pålsson, Björn A.

“…Railway crossings are subjected to a severe load environment leading to damage and degradation of rail profiles. The damage is the result of the high…”
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Optimisation of slab track design considering dynamic train–track interaction and environmental impact by Aggestam, Emil, Nielsen, Jens C.O., Lundgren, Karin, Zandi, Kamyab, Ekberg, Anders

“…Modern railway tracks for high-speed traffic are often built based on a slab track design. A major disadvantage of slab track compared to conventional…”
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Metamodelling of wheel–rail normal contact in railway crossings with elasto-plastic material behaviour by Skrypnyk, Rostyslav, Nielsen, Jens C. O., Ekh, Magnus, Pålsson, Björn A.

“…A metamodel considering material plasticity is presented for computationally efficient prediction of wheel–rail normal contact in railway switches and…”
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