Abstract
Both experimental as well as numerical analyses have been performed to establish the understanding of the influence of rolling on the tire dynamic behavior. The experimental analysis is based on accelerometer measurements on the inner liner of a tire. The numerical analysis is based on a highly detailed tire model, including complex material properties by means of frequency dependent viscoelastic material definitions. A comparative analysis is performed to evaluate the correspondence and differences between experimentally and numerically obtained modal parameters of a rolling tire.
The analyses also show how the footprint contact, established due to loading of the tire, acts as a boundary condition for the structural waves and thus influences the dynamic behavior of the rolling tire. The results show that a rotating tire is subjected to Coriolis accelerations which make the wave speed of the positive- and negative-going wave to diverge from each other. This leads to complex or travelling wave mode shapes. The experimental analyses confirm the numerically predicted effects of rolling on the tire dynamic behavior.
KEYWORDS – tire/road interaction, structural dynamic behavior, operational modal analysis, complex frequency extraction