| Tyre stiffness is one of the most critical attributes that would impact the full vehicle ride and handling performance. Especially cornering stiffness, which significantly influences vehicle rolling activity, straight line stability and rollover safety. Therefore, one 128 205/60 R16 radial tyre set as example in this thesis, most of construction parts were reasonably simplified-tread, sidewall, belts, plies. In order to control tyre shape and mesh accuracy’s influences to simulation solving, the tyre cross hatching line size has been calculated and redrew. Then a 1D beam,2D shell and 3D solid element combined radial tyre FE model was built. Afterwards, LS-DYNA software was used to analyze tyre stiffness merit under different road conditions. Compared with common used full shell tyre model and all solid element tyre model, multiply simulation conditions were built to carry out simulation solving accuracy and efficiency analysis of the combination element tyre model.An improved mathematical tyre cornering angle algorithm was proposed based on the displacement of the finite elemental nodes. Using the Fiala Tyre theory, the calculation model resolved inaccurate tyre critical contact point positioning issue during pervious FEA basis cornering angle solving, the general calculation precision was improved as result. Its validity was proved by relationship demonstration of tyre contact patch’s half total length and linear region length. Then take the combination radial tyre model as an example, cornering stiffness simulation and result comparison against test data was carried out via cornering angle compute formula built above. As a result, the simulation and test data have showed preferable consistency. Compared with previous critical point FE method, the Fiala basis improved algorithm could provide higher simulation accuracy. Finally, the corresponding issues were discussed about how tyre pressure influence stiffness attributes. |
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