Nonlinear FEA rotating tire modeling for transient response simulations.

摘要

Of critical importance to the analysis, simulation, and design of safer and more advanced tires will be the establishment of a precise model covering the whole tire structure correctly and in as much detail as possible. Further, because of the limitations of traditional testing facilities, some actual tire rotating tests under severe operating conditions are not always achievable; this is probably the best reason why accurate tire models and simulation algorithms are so needed in today's industries. Therefore the ultimate goal of this research is to build a nonlinear FEA tire model and a virtual tire/drum rotating test machine to simulate these severe operating conditions, which has never been accomplished before.; The four major steps of this research are to: (1) Conduct literature survey about tire models and tire transient responses analyses. (2) Create an FEA tire model and a virtual tire/drum rotating test machine. In order to more accurately model real-world conditions, and in contrast to previous related research whose tire models were composed of only one element type, the FEA tire model developed in this research adopted four different types of elements (solid, membrane, shell, and beam) incorporating over 18,000 nodes and 24 different material definitions, to describe the whole tire's construction in extreme detail. Full FEA tire/drum models and the virtual tire rotating test machine were built. The tire thus modeled will then be used to detect in-plane free vibration modes transmissibility and predict standing waves phenomena of a rotating tire under various inflation pressures, loading conditions and obstacle effects. (3) Develop tire transient dynamic responses simulations. The tire in-plane free vibration modes transmissibility was successfully detected using the virtual tire/drum rotating test machine created with PAM-SHOCK. The results of the simulations showed excellent agreement, quantitatively and qualitatively, with previous research. The standing waves phenomenon was also successfully simulated, predicted, and visualized for the first time. The simulations bypassed the practical difficulties of measuring actual tires, and are superior to the oversimplified analytical derivations. (4) Verify simulation-strategy and tire-model parameters. Six important simulation-strategy and tire-model parameters used in this research were tested, verified, and shown to be in excellent agreement with the experimental results from this research, the previous empirical data, and theoretical/analytical derivations of other investigators. (Abstract shortened by UMI.)