In this study, a three-step friction estimation algorithm is proposed; through a combination of experiment-based and model-based approaches, the tire-road

friction coefficient is estimated.

The results showed that the

friction coefficient of the biodiesel reduces with decreasing amount of monounsaturated than total saturated fatty acid methyl ester content for all of the biodiesel resources, but their load-carrying capacity declines.

The static

friction coefficient ([[my].sub.s]) was calculated as the tangent of the inclination angle ([alfa]).

Polyformaldehyde is characterized by a low

friction coefficient and good wear characteristic.

The

friction coefficient was calculated using the law of Coulomb friction, F = [micro]Fn.

The elastic modulus is 68 GPa, the Poisson's ratio is 0.3, the density is 6538 kg/m^3, and the

friction coefficient is 0.3.

In the present work, we focus on proper determination of the

friction coefficient. It is a purely phenomenological term, and we determine its value in such a way that the movement of objects corresponds to reality.

The

friction coefficients versus friction time for chroming and nonchroming coated T10 steel discs against 20CrMnTi steel pins were illustrated in Figure 2.

Effect of

Friction Coefficient on Relative Slippage.

This result reflected the diverse trend of

friction coefficient with the lowest value of 0.58 at the three loading levels.

A fundamental parameter in the behavior of a CSS is its dynamic

friction coefficient [mu].

The

friction coefficient required in this model was estimated based on the recommendations of EC3 standard the coefficients vary between 0.2 and 0.5 depending on a diversity of factors in which the roughness of the surfaces in contact is one of the most determinant.