High-speed electric multiple units (EMUs) have been popularized rapidly all around the world and have become a major transportation method. The working mechanism of rail grinding has not been investigated theoretically. This study develops flexible car body and human body models based on the rigid-flexible coupled method to systematically study the effects of wheel-rail wear and rail grinding on passenger ride comfort. Additionally, the effects of rail grinding are evaluated, based on a long-term investigation of rail surface conditions after grinding, in order to guide the establishment of vehicle vibration models and inform practitioners.
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