Modelling of dynamic contact length in rail grinding process

摘要: Rails endure frequent dynamic loads from the passing trains for supporting and guiding wheels. The accumulated stress concentrations will cause plastic deformation of rail towards generating corrugations, contact fatigue cracks also other defects, resulting in more dangerous status even derailment risks. So grinding technology has been invented with rotating stones pressed on defects removal. Such works are directed by experiences rather than scientifically guidance, lacking flexible scientific operating methods. With control unit holding stones, process characteristics not only surface but running railway vehicles. First all, it’s important to analyze length between stone rail, because is a critical parameter measure capabilities stones. Moreover, needed build up models vehicle bonded represent car. Therefore theoretical model developed based geometrical analysis. And calculating improved considering car’s behaviors during process. Eventually, results obtained taking both operation parameters structure into calculation, which suitable revealing combining mechanism systems.