This paper deals with the lateral force effects of conventional four-axle railway vehicles in conditions S-shape curves, which are represented especially by switches negotiated diverging direction. With use a multi-body model an electric locomotive, sensitivity analysis selected vehicle parameters on maximum guiding S-curve is performed. Subsequently, definition so-called equivalent proposed. s...

The effect of different operational loading scenarios on predicted crack growth direction for a propagating inclined railhead is assessed by 2D finite element simulations. Studied load include moving Hertzian contact load, temperature drop, rail bending due to passing wheelset, and combinations thereof. the unbiased propagation using an accumulative vector tip displacement criterion. numerical ...

Wheel wear is a natural phenomenon of wheel–rail rolling contact during vehicle operation. The non-uniform in lateral and circumferential directions normally occurred on wheels. will lead to the unexpected hollow which can cause flange vibration at low-frequency band, result vertical originate from polygon phenomenon. These two forms are coupled each other wheels affect dynamic behaviours syste...

today one of the ecological crisis is the phenomenon of desertification that affecting the world. desertification is more related to social and anthropogenic issues than natural causes and it becomes more important over the time. monitoringis the systematic collection and analysis of information as a project progresses. in this study, using ahp method and gis techniques has been to assess deser...

this study describes the prevalence of cardiac dysrhythmias occurring over a single 24 h period in ponies and compares the heart rate and frequency of dysrhythmias in two groups of ponies of different ages. electrocardiograms were recorded using a holter monitoring system from twenty four ponies aged less than 15-year-old (n = 14) and greater than 15-year-old (n = 10). subsequent analyses of ca...

The use of physiologic monitoring (e.g., cardiac monitoring) as an important component in providing safe patient care has escalated over the past two decades. It enables the clinician to detect physiologic changes in the patient's condition before they become clinically significant, thus allowing anticipation and prevention of adverse events. Issues and concerns regarding physiologic monitoring...