Abstract
In these years, drive-system noise generating from motor vehicles on meter-gauged railways is decreased by employing fully enclosed type traction motors. However, the sound level of a gear noise is still remained high relatively. Our purpose is to develop a low noise gear systems by changing gear materials. In this paper, We carry out the running test and analysis of low noise gear made by ductile cast iron(FCD900), using mechanical dynamic behavior analysis, FEM analysis and BEM analysis to predict the vibration and sound power reductions of the gear systems. Consequently, we found that the gear which added to the materials has the lowest sound level by the improvement effect of the gear contact surface, compared to conventional one.
