Robust optimisation of dynamic and NVH characteristics for compound power-split hybrid transmission

Abstract

In this paper, vibro-acoustic characteristics of a power-split hybrid transmission including a compound planetary gear set are investigated by numerical procedure and refined system dynamics modelling. For validation of the numerical predictions, bench tests are performed for dynamic and acoustic responses of the hybrid transmission, contribution rates of acoustic radiation power induced due to the planetary gears, support bearings, transmission shafts and the gearbox housing are estimated. In improving the noise, vibration and harshness (NVH) performance of the transmission during hybrid vehicle acceleration, traction torques of the motors against the planetary gear parametric resonance are formulated and an optimal control strategy is proposed. By real road NVH test results acquired on board of the midsize hybrid car, it is demonstrated that a significant reduction of the planetary gear whine noise is achieved. As a result, numerical approaches applied to establish relationships between torques of the two traction motors and parametric excitations of the compound planetary gear train are experimentally validated.

Analysis of the Dynamic Characteristics of Coaxial Counter-Rotating Planetary Transmission System

“…They obtained the forced vibration response to gear mesh excitations by applying the modal summation technique. Guo et al [13] investigated the vibration and acoustic characteristics of a power-split hybrid transmission utilizing a compound planetary gear set through numerical processes and refined dynamics modeling. Tung et al [14] developed a time-varying reduced-order numerical model for a compound reducer, enabling the prediction of its meshing frequencies and harmonics.…”