International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The purpose of the current study is to evaluate and apply a new approach to the design process of an aircraft with a high aspect ratio wing, based on modern understandings and development in the fields of aerodynamics and computational fluid dynamics. Conventional methods rely on semi-analytical models for describing different flow characteristics and interactions with bodies. The classical approach requires numerous coefficients to account for unknown effects, what is more, such workarounds are derived for well-defined cases and are not easily applicable for complex problems which could be dangerously misleading. CFD analysis, based on new developments in computational machines, give the possibility of analyzing complex aerodynamic interactions such as shading, downwash, ground effect and vortex shedding. Such use of innovative technology has already proven itself to have beneficial effect on reduction of cost a nd human error by being able to simplify and speedup many of the calculations without the need of coefficient adjustments.

Friction clutches are mechanisms placed between the engine and the gearbox and are used to transmit the torque from the engine of the vehicle to the transmission. The clutches should provide start and stopping of the vehicle without vibration and need to have a certain lifetime. The tribological parameters of the linings in these clutches depend on several factors: the quality of the linings, the conditions of the test (exploitation), the temperature between the friction surfaces, the specific pressure between the friction surfaces, the speed of sliding of the friction linings, the number of turns on the clutch, etc. In this paper, will be analyzed the impact of the speed of sliding of friction linings on the tribological parameters of the linings.