Abstract
Transmission transfer gear noise, due to its nature, is generated in the high frequency region and is therefore at a disadvantage to the hearing on the vehicle condition. In this paper, Academic experimental study was investigated on the bench and vehicle. First through the FRF test, fragile part of transmission case was investigated. After stiffness reinforcement on fragile part of case, structure born noise was improved. Second, through the transmission error analysis, micro geometry optimization was carried out. After micro geometry optimization, transfer gear noise was improved about 5dBA. Third, through the investigation and improvement of transfer path system on the vehicle, finally transfer gear noise reached acceptable level.
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