Volume 8, Nº 4 (2021)

The present time is characterized by the active use of information and communication technologies in education, in particular distance educational technologies. The widespread use of distance learning is due to the ability to study at a convenient time, in a convenient place and pace, providing students with equal opportunities to receive education regardless of their place of residence, health status and material situation. Moreover, and due to the current epidemic in the world, distance learning has become a necessity, accompanied by an increased load on the Internet, therefore, and based on the importance of distance learning in our time, it is necessary to develop effective data transfer algorithms to ensure the optimal operation of the distance learning process. This paper discusses the various mechanism and network protocols used in distance learning, and technical requirements almost for each of them, suggests a new mechanism and algorithm for supporting the transmission of multimedia packets which are very essential and important in the process of distance learning, explains the concept of quality-of-service QoS in computer networks and its importance to provide a good data transmission through the network, Quality of service is based on the management of such data transmission parameters as network bandwidth, information transmission delay, percentage of packet loss in the network and jitter, every type of network application imposes its own QoS requirements to ensure successful and effective data transfer.

The article presents mathematical models and results of computer simulation of oscillatory processes created by a planetary vibrodrive with kinematically unbalanced masses in machines for mixing liquid mixtures. The proposed mathematical models cover the movement of the center of mass of the vibrodrive actuator during runout and in a steady-state state. They allow one to visualize the flow of a liquid mixture in the working area of the machine and to determine the components of the motion speed in the radial, circumferential, and axial directions. The purpose of computer simulation is to clarify the physical mechanism of mixing liquid media when combining the rotational movement of the working element with radial-axial oscillations, to streamline mixing a liquid mixture with the least effort and energy consumption, and to determine the conditions, under which the turbulization increases and there appear various vibromechanical turbulent conditions. Computer simulation of oscillatory processes based on the proposed mathematical models reflected the predominant capabilities of the considered vibrodrives in controlling the oscillation parameters of the working element of the machine for mixing liquid mixtures. The results of computer simulation obtained using advanced software allow one to evaluate the ongoing oscillatory processes by the visual appearance of vibromechanical turbulent modes and the speed of the particles in the flow of a mixing liquid, as well as to ensure the required optimal operating mode of the vibromachine by determining the necessary values of the setting parameters of the vibrodrive. The research determined the operating parameters of the considered vibromachine, at which a certain turbulent mode is achieved, and found the optimal conditions for mixing liquid mixtures, under which there appear turbulent flows increasing the mixing intensity.