Validation of an eMBS Tractor Full-vehicle Model Based on Cutting-force Measurements

The article delves into the validation of an elastic Multi-body Simulation (eMBS) model for a tractor, focusing on reducing structure-borne noise and improving driving noise comfort. It begins by explaining the importance of validated complete vehicle models in the early development phase to target driving noise comfort effectively. The article details the measurement of dynamic forces transmitted into the cabin and the development of a flexible multibody simulation model that accurately represents the tractor's NVH behavior. The model includes essential components such as the VarioDrive unit, drivetrain, flexible vehicle frame, and cabin structure, with a focus on high-frequency excitations up to 1 kHz. The validation process involves comparing physical test data with simulation results, demonstrating the model's accuracy in identifying dominant transmission paths and reproducing amplitude levels. The article also highlights the application of the eMBS model in the development of the Fendt 700 Vario Gen7, where it played a crucial role in reducing interior sound pressure levels by up to 10 dB. The conclusion emphasizes the importance of model accuracy, setup time, and computation time in integrating complex NVH disciplines into the development process effectively. The article concludes with plans to incorporate additional excitation mechanisms in future models, such as gear excitation and tire-lug excitation, to further enhance the simulation's accuracy and applicability.