Noise and vibration simulations method for electric hybrid tractor powertrain.
To be published on November 21, 2019 by SAE International in United States
Event: NuGen Summit
Internal combustion (IC) engines have been serving as prime source of power in tractors, since late 19th Century. Over this period, there have been significant improvements in IC engine technology leading to increased power density, reduction in tailpipe emissions and refinement in powertrain noise of tractors. As the regulations governing tailpipe emissions continue to be more stringent, original equipment manufacturers also have initiated work on innovative approaches such as diesel-electric hybrid powertrains to ensure compliance with new norms. However, introduction of such technologies may impact customer’s auditory, vibratory and drivability perceptions. Absence of conventional IC engine noise, association of electric whistle and whine, torque changes with activation/de-activation of motors and transmission behavior under transient conditions may result in new NVH issues in hybrid electric vehicles. The following paper addresses these concerns and introduces a multi-physics simulation model to investigate and mitigate these effects. The multi physics simulation model presented in this paper incorporates the multi-disciplinary domain of internal combustion engine thermodynamics, electric components, mechanical systems, control systems and the vehicle response.