Study on the first step mode of locomotive carbody

A model is built for analysis of locomotive carbody characteristics, in which the sliding roof cover is considered to be loadedand unloaded. The vibration modes of the structure are calculated by dispersing the structure with different element. The model at the firststep is analyzed and compared. Mode calculations are done to the SS7D electric locomotive with and without the cover, showing the influenceof the roof stiffness on the vibration type under first step mode of the carbody.