Coupled dry friction models in problems of aviation pneumatics' dynamics

The dry friction model accounting the combined kinematics is constructed using the differential Coulomb's law formulation for a small contact spot element. Integrating over the contact area results the exact dynamically coupled model that can be approximated by the one containing linear and quadratic forms of sliding and spinning velocities. The example of the real tire is studied using the finite element solution for the quasi-static contact pressure distribution; its analytic approximation allows one to compute the dry friction model coefficients. The effect of the contact pressure distribution on the friction spin is shown.