Optimization under Acceleration Conditions of Electric Bus Based on Gear Micro-Modification Methods 2019-01-0781
Because of the superior advantages of electric buses on energy saving and emission reduction than the traditional diesel buses, the electric bus are widely used in short-distance travel and urban public transportation. However, compared with the traditional diesel bus, the electric bus gearbox noise is more prominent due to time varying loads effect and the absence of diesel engine masking effect under the acceleration condition, which deteriorates the NVH characteristics of the whole vehicle. The experiment results showed that the radiated noise of the gearbox under the three-gear acceleration condition was significantly higher than the other acceleration conditions. In this paper, boundary element radiated noise model has been established and the meshing noise of the shifting gear was found to be the main noise source of the gearbox radiated noise under acceleration condition. In order to optimize the three-gear acceleration radiated noise, method of gear microscopic modification has been used and showed a relative effect on radiated noise reduction.