Torsional vibrations phenomena are self-excited that occur in the wheelset of railway powertrains due to counter-phase oscillation both wheels. Long-lasting events this type may lead catastrophic failures. Therefore, torsional vibration suppression and mitigation methods have drawn significant attention from industry recent few years. Conventional reduce motor torque once is detected. However, ...

apart from regular wheel wear such as decreasing wheel diameters and reduced flange thicknesses and heights, wheel flats (wf) and oval wheels (or oor, out-of-roundness) are the most common wheelset problems for railway vehicles. within the fp7 research project “saferail”, apt has developed an innovative wheelset monitoring system so-called “wheel flat and out of roundness monitoring (worm) syst...

Railway track defects must be detected and repaired to ensure the safe operation of railway. Signals generated by wheelset contact with rail discontinuities contain information about railway structure health. Each signal has a characteristic pattern, which is modified in presence defects. Signal decomposition commonly used extract characteristics from impact response signals. It necessary selec...

The elastic vibration of the wheelset is a potential factor inducing wheel-rail defects. It important to understand natural characteristics flexible for slowing down defect growth. To estimate free railway with multidiameter axle, transfer matrix method (TMM) applied. matrices four types beam models are derived including Euler–Bernoulli beam, Timoshenko without mass and shearing stiffness, mass...

Wheel/rail contact simulation is one of the most complicated problems in the modeling of railway vehicles. The wheel/rail interaction plays a unique role in rail vehicle dynamics. In this paper, the dynamic response of the wheel on irregular rail track is analyzed with analytical approach using the method of Multiple Scales (MMS). The Hertzian contact theory is used to obtain the relationshi...

The main topic of this article is the strength analysis selected bogie components – wheelset axle and frame. Axle calculations were based on analytical method conducted with different types materials. finite element was used for verification frame construction loads applied calculated according to PN-EN 13749 norm. a part suspended electric multiple unit which matter authors’ master thesis: „Th...