Methodology for Reducing Engine-Radiated Noise in Tractors

Engine radiated noise has complex behavior since the diesel engine assembly comprises several components with varied dynamic speeds. The engine noise performance for the open station tractor is a crucial contributor to noise and needs to be optimized. Various engine noise sources have been researched, including structural like the engine block, intake, exhaust, and timing gears. Reducing noise in diesel powertrains by structural improvements entails limiting vibrations and preventing noise transfer from the engine. This can be accomplished by increasing the rigidity of the engine block and other structural components, as well as optimizing structural designs. Local adjustments to structural components have become a significant strategy for reducing noise and vibration problems. Design enhancements in structural components can be predicted and optimized for NVH. NVH testing helps validate changes in engine structure stiffness and assess acoustic improvements. Coupled with simulations and design updates, it reduces structure-borne noise and harshness. This integrated approach improves diesel tractor comfort and quietness during operation, without compromising its performance. A three-cylinder engine presents the unique balancing challenges due to its inherent primary and secondary forces and moments. The static balancing is achieved by counterweights that balance the crankshaft. The crankthrows are 120 degrees apart, and this leads to the sum of vertical forces, which is not equal to zero. So 50% of the reciprocating mass forces are countered using the rotating balance mass. The numerous noise reduction strategies used in internal combustion engines (ICE), emphasize the interdisciplinary approach of multibody dynamics, structural simulation, and testing methodologies required to address this complicated issue of noise reduction