14 Nonlinear 3D Dynamic Model of an Automotive Dual Mass Flywheel 141 Fig. 14.8 (a) Mean stiffness value of the DMF during hysteresis compared with the mean angular velocity variation of the DMF assumed during hysteresis cycle. Stiffness values are scaled with respect the maximum stiffness reached in experimental tests at 3000 rpm. (b) Undamped FRF response (Clutch angular acceleration vs Torque at First DMF stage) in correspondence of the first torsional mode shape. Frequency are scaled with respect the maximum natural frequency of the mode shape at 3000 rpm Acknowledgements Authors Gianluca Quattromani, Edoardo Sabbioni and Federico Cheli would like to acknowledged Ferrari S.p.A. for the financial support and for their kind backing of this work. The authors Antonio Palermo and Francesco Pulvirenti are research partners of Ferrari S.p.A.
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