Comprehensive dynamic model of a full transmission driveline with nonlinear centrifugal damper

Centrifugal pendulum absorbers are passive devices nowadays used to attenuate torsional oscillations especially of vehicles drivelines. The scope of this investigation is to assess the vibrations reduction granted by this kind of dampers considering the overall drivetrain system dynamics. The representation of the entire driveline is fundamental to appreciate the variation in the behavior of centrifugal dampers when coupled with a system composed by several flexible bodies. For this purpose, at first, a driveline torsional lumped model is built and the results of its simulations are herein discussed. The focus of this approach lies in the refined formulation of the dual-mass flywheel model, since its nonlinear behavior heavily affects the isolation performance of the driveline. To reduce the vibration propagation from the engine to the transmission, a centrifugal pendulum model is installed onto the dual-mass flywheel one. Then, design guidelines on the pendulum tuning are provided by means of a simplified modeling methodology and, finally, the effectiveness of this damping solution is evaluated through numerical verification on a nonlinear model.