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

The paper deals with an operating photovoltaic plant in Bulgaria. The wide application of photоvoltaic plants in the energy system is known. At the same time, subject matters about their normal functioning are fundamental. The goal of the paper set is to analyze data from the operation of a photovoltaic power plant , which is ultimately related to improving its behavior. Relevant conclusions have been dоne.

The paper justifies the importance of the experimental determination of rotational variability of cardan drives and couplings.
The objective of the authors’ team was to elaborate a new automated test machine for the determination of this variability. The principle design of this new automated test machine is described in details. The advantages of the application of electronic measuring equipment in combination with PC for the automation of the measuring and experimental data processing are pointed out. The test machine gives opportunities for changing of the angles between the driving and the driven shaft and for regulating the rotational speed of the driving shaft.

The other functions of the electromechanical test machine are described in details in the paper. Conclusions are made: the methodology for experimental research of rotational variability of cardan drives is improved; the application of electronic test machine verifies the advantages of the usage of high sensitive and precise sensors of new generation; contemporary approaches are applied.

Presented in this paper is the authors’ research of the different applications of the newest information technologies in agriculture.
Provided in this article is information concerning the use and application of GPS receivers and GIS software, which are valuable for the up- to-date agriculture. These technologies and their applications provide numerous possibilities, as for example mapping of the nature’s resources, evaluation of the environmental impact, mapping of different soil types, etc.

The different applications of the available hardware and software, which affects the efficacy and productivity of the agricultural activities, were analysed. Low-cost RTK-GPS receiver is represented. A technology for the data processing of the digital mapping information is provided as well.