Nonlinear 3D Dynamic Model of an Automotive Dual Mass Flywheel

Internal combustion engines produce a fluctuating torque due to discrete pistons combustion, as well as induced inertial imbalance of the reciprocating pistons. In standard operating conditions, the resulting torsional oscillations of the crankshaft are transferred to the gearbox, leading to a number of comfort problems. Rattle noise is one of these problems and it is caused by impulsive forces caused by clearances across the driveline and especially in the gearbox. In order to prevent rattle, dual mass flywheels may be used to reduce torsional oscillations in automotive powertrains. The present paper presents a 3D nonlinear dynamic model of an automotive dual mass flywheel. The model is made of primary and secondary masses and the arc springs between them. Centrifugal effects and redirection forces acting on the springs as well as nonlinear contact forces due to stoppers and flanges bounding spring motion are accounted for. Moreover, friction occurring in seals and friction resulting from the spring radial forces are included. The developed dual mass flywheel model is included into a multi-body model of the vehicle powertrain to assess the effect of its main parameters on the driveline behaviour (e.g. modes of vibration, radial forces).