Parameter identification for LMS CDTire

This paper discusses the parameter identification procedure for the LMS comfort and durability tyre (LMS CDTire) model. CDTire is a family of three models (namely CDTire 20, CDTire 30 and CDTire 40) based on a macroscopic physical description of tyres, which is a compromise between scope of applicability and speed. The 'macroscopic description' implies that the actual model contains elements representing, for example, the 'belt', but not individual cords of the belt layers. Therefore, model parameters such as the belt bending stiffness essentially have to be determined by testing the whole tyre in a number of different ways instead of assembling mechanical properties of all the individual elements of a tyre such as cord stiffness. The considered tests are standard tyre tests that can be performed by most tyre test facilities. The parameter identification process is explained in a generic way with exemplary focus on one specific identification subtask, as the complete process description would go beyond the scope of this article. Furthermore, some of the strategic decisions made in the build-up of the parameter identification process are highlighted. Together with a more involved discussion on some numerical aspects of the tyre test rig simulations, the choice of optimization algorithms is explained. The technical discussion is complemented with some results obtained with this parameter identification procedure on a 205/55 R16 non-commercial passenger car tyre.