An Investigation into the Effects of Structural Resonance on Planetary Gear Meshing Vibration in Automatic Transmissions and Derivation of Analytical Improvements

With the accelerated trend toward powertrain electrification and increased demand for fuel efficiency, hybrid vehicle adoption has been growing rapidly. In particular, for hybrid vehicles, the development of transmission planetary gear noise and vibration control is crucial to ensuring customer satisfaction regarding vehicle quietness, as these vehicles may lack the masking effect of engine combustion noise. Unlike previous studies that focused on optimizing gear micro-geometry through transmission error analysis to reduce planetary gear vibration, this study experimentally verifies that planetary gear vibration is amplified by the structural resonance of transmissions and its internal components. Based on these findings, an analytical improvement approach is proposed.