Nicolae Cordoș

Evaluation of the Behavior in Cornering for Different Classes of Passenger Cars by Numerical Modeling

This paper presents a study, using modeling methods, on the behavior of different classes of passenger cars in cornering. Taking into account the factors that influence the movement and tendency of the cars in cornering, the parameter values in the mathematical model were chosen so as to characterize the real situations encountered frequently in cars’ exploitation in the cornering process. In order to have relevant results for the chosen cars, different experimental loads (for each axle) were determined for different loading cases. The analytical model, developed in Mathcad, takes into account the geometrical parameters of the passenger cars and helps to determine the understeering or oversteering tendencies. The results were represented graphically in order to facilitate their comparison.

Evaluation by Experimental Methods of the Parameters that Influence the Behavior of Various Passenger Cars Classes in the Braking Process

This paper presents a study - by experimental methods - on the behavior of different classes of passenger cars in the braking process. In the experimental determinations, the parameter values were chosen to characterize the real studies case, commonly encountered, of the passenger cars use in the braking process. Thus, it is considered the experimental determination of the braking ability parameters of the studied passenger cars depending on tire pressure, loading on axles, nature and condition of the rolling surface, tire type (summer or winter) and type of braking system. The way in which behave the passenger cars equipped with winter tires in a situation where the weather requires summer tires at different inflation pressures, also show interest. For the frequency assessment of the brake using in urban areas at different traffic densities it has been used Android applications. The results were represented graphically in order to facilitate theirs comparison.

Estimation of Boiling Points of Brake Fluids

One of the most important properties of brake fluids is their boiling point. A too low boiling point may permit the forming of vapor during frequent and/or severe braking. Hereby the brake fluid becomes compressible and the braking performance decreases.