Influence of Bearing Positions on Sound Radiation of Single-Stage Spur Gear System

Abstract

The vibration transmission in an experimental gearbox and the structure-borne noise are measured for various positions of bearings in the gearbox. The bearing offset from the center of the housing wall considerably influences the vibration and radiated sound power. The radiated sound power increases with the offset. The sound power is well evaluated by the proposed method of simulation which integrates the FE vibration analysis and BEM-based acoustic analysis. The simulation suggests that the design of the gearbox is the key, and the vibration mode, which reduces the stiffness at the bearing positions, should be isolated for the reduction of sound power.