A finite element tire modelling approach for car interior noise simulation
|Bearbeitung:||Prof. Dr.-Ing. Udo Nackenhorst, Dipl.-Ing Raffeala Chiarello|
The finite element (universal) tire model consists of about 200.000 unknowns taking into account 16 different material groups within the cross section. In a first step a stationary non-linear rolling analysis is performed In this pre-stressed state an eigenvalue analysis is computed for the rolling wheel, incorporating gyroscopic effects The modal tire model is reconstructed considering a limited number of eigenmodes corresponding to a user defined limit frequency.
The dynamic characteristics for the individual tire model are fitted to results obtained from standardized laboratory experiments. By a physically motivated hierarchical optimization strategy the model parameters are identified such that the measured dynamic axis reaction response spectra are represented best by the modal tire model. Besides the adjustment of eigenfrequencies and modal damping parameters special effort has been paid on the excitation function which defines the response amplitudes.
The importance of a physically consistent modelling approach will be underlined by the meaning of gyroscopic effects. By this approach a physical reliable and numerical efficient model is presented, whose parameters are obtained from laboratory experiments for individual tires.