A study has been conducted on the use of alternative energy sources for propulsion of a vessel in inland waterway transport. It is clear that at this stage it is most appropriate to use a vessel designed for short-haul trips between two banks of a ferryboat for passengers and luggage or for recreation and entertainment. On this basis, research has been conducted on a newly designed and built vessel to carry up to 12 people. The drive is fully powered by 180-Ah batteries at 48 V. The batteries are charged by the sun through 5-kW solar panels. The results show that the vessel powered by two 5-kW electric motors can sail autonomously for about 1.5 hours, to travel about 13 km, at an average speed of 7.9 km/h with an average energy consumption of 71.3 kWh/100km when sailing on a linearly reversible route including sailing downstream and upstream on the Danube River.
The present work reviews the border checkpoints in Bulgaria and their work for one year. On the basis of collected information, the seasonal inconsistency of work at the border checkpoints is assessed and their work is modeled as a mass service system (queuing system or theory) to assess capacities to a specific point in the existing infrastructure and organization of work. Capacity of border crossing point is defined as the time for stay of heavy goods vehicles at different incoming flows as well as the limit value of the number of cars that can be handled. For the calculation of the parameter values, an application in a MatLab environment was created. A fractional rational function of the fourth degree is chosen as a numerator and denominator.
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