Žilinská univerzita v Žiline

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    THE IMPACT OF TEMPERATURE AND WEAR ON LI-PO ACCUMULATORS DISCHARGE CHARACTERISTICS
    (Žilinská univerzita v Žiline, 2020) Kubáč, Tomáš; Hospodka, Jakub
    The goal of this paper was to find out how the ambient temperature affects the discharge characteristics and the useful energy density of lithium polymer accumulators. Also, to identify how these parameters are affected by age and wear of these accumulators. Li-Po accumulators are the most used energy source for small unmanned aerial vehicles. It is very important to know limitations of this energy source to allow efficient and safe usage. Especially these days, when these machines are being introduced into many industries. It has been found that low temperatures have a negative impact on the available accumulator capacity, especially the older ones. High temperatures, on the other hand, only slightly increased the capacity of the new accumulator. The old accumulator was affected more, higher temperatures helped to increase its available capacity. Using information gathered form this paper would help them use Li-Po accumulators more efficiently and save money on new ones because of increased life time.
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    ELECTRIC MOTOR AS A REPLACEMENT FOR COMBUSTION ENGINE IN PROPULSION SYSTEM OF AIRCRAFT
    (Žilinská univerzita v Žiline, 2020) Michalík, Matúš; Čerňan, Jozef
    Main aim of this paper is to acquaint readers with a new-formed trend in aviation, which is electrification of aircraft propulsion systems. In thesis I target to social-political, econo]mical and technical aspects of this kind of propulsion which have positive or negative tendency in next evolution of electric propulsion. With my mentor we assume that the main problem will be with energy density of Lithium batteries which is sixty time lower than density of comertional jet fuels. This problem we present in examples of three airplanes with different capacity and range. At the end of the thesis we presented the most interesting existing project of electrically-propelled aircraft and analyzethe main advantages of electric propulsion.