A5030901994- Railway Engineering and Dynamics
- Mechanical stress and fatigue analysis
- Gear and Bearing Dynamics Analysis
- Welding Techniques and Residual Stresses
- Metal Alloys Wear and Properties
- Geotechnical Engineering and Underground Structures
- Health Systems, Economic Evaluations, Quality of Life
- Structural Load-Bearing Analysis
- Management, Economics, and Public Policy
- Engineering Applied Research
- Railway Systems and Energy Efficiency
- Mechanical and Thermal Properties Analysis
- Fatigue and fracture mechanics
- Advanced Welding Techniques Analysis
- Adhesion, Friction, and Surface Interactions
Chalmers University of Technology
2018-2023
Abstract Dynamic wheel–rail contact forces induced by a severe form of wheel tread damage have been measured impact load detector during full-scale field tests at different vehicle speeds. Based on laser scanning, the three-dimensional geometry is employed in simulations dynamic vehicle–track interaction to calibrate and verify simulation model. The relation between magnitude various operational parameters, such as speed, lateral position contact, track stiffness within sleeper bay,...
Wheel–rail impact loads generated by discrete wheel tread irregularities may result in high dynamic bending stresses the wheelset axle, leading to a decrease component life and an elevated risk for fatigue failure. In this paper, versatile cost-efficient method simulate vertical interaction between railway track, accounting generic distributions shapes of damage, is presented. The (comprising two wheels, axle any attached equipment braking power transmission) track with discretely supported...
A combination of instrumented wheelset measurements and numerical simulations axle bending stresses is used to investigate the consequences evolving rolling contact fatigue (RCF) damage on a passenger train wheelset. In field test campaign, have been monitored using with four strain gauges mounted axle, while evolution wheel tread (out-of-roundness) has measured regular occasions. The signals are post-processed in real time stress variations computed. Based convolution integral approach,...
This paper provides an overview of different theories to analyse unsteady rolling contact phenomena between wheel and rail: the exact formulation by Kalker, simplified model based on Winkler approximation, recent two-regime model. The classic solution transient problem derived Kalker using complete theory elasticity is first recalled. more involved situation combined creepages spin analysed Kalker's Analytical solutions are reported in integral form concerning time-varying constant...
Abstract Field tests using an instrumented powered wheelset were performed to investigate fatigue damage accumulation in railway axles. Axle bending strains measured and post‐processed obtain axle stress spectra. Statistical analyses used the variations of spectra due changes operation parameters. The study indicates that can be modeled truncated normal distributions, where large majority amplitudes are lower than 50 MPa. Stress cycles at higher affected by parameters such as track design,...
Welding of rails in the field is usually associated with a large heat input, which results heat-affected zone (HAZ), turn may impair welded rail head and decrease its service life. An innovative orbital friction welding (OFW) process an intermediate eccentrically oscillating disk proposed, demonstrator has been constructed. This enables rails, have non-symmetric cross-sectional area must be stationary during welding. The characterized by low creating narrow HAZ, deformations. A...
This work aims at investigating how variations in measured stresses are affected by track conditions and, if possible, extract information on from onboard measurements. Axle bending strains extensive field tests employed to evaluate axle stress spectra. Correlation between spectra and parameters describing design condition for three sections of the Swedish mainline “Västra stambanan” have been investigated. The study shows switches other discontinuities running surface increase scatter...