Browsing by Author "Uhlár, Erik"

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    Long-range UAV hybrid petrol-electric powertrain
    (University of Žilina, 2023) Uhlár, Erik; Pecho, Pavol
    Along with increasing UAV both weight load and endurance requirements, there is a need to use alternative propulsion solutions, to satisfy the market as well as various customer applications. Although lithium polymer cells are yet well developed, they are still too heavy for long-endurance UAV missions. Hybrid petrol-electric powertrains are outstanding imitations of hybrid hydrogen-electric propulsion systems, which are currently under intensive development. Not only for their onboard power production and improved overall efficiency but also for simulating a weight load of a future hydrogen-electric system. Therefore, such a system is being tested and aimed to be used in fixed-wing UAVs for long-endurance missions. This paper describes the design and operation of a hybrid petrol-electric propulsion system and further operational optimization based on comprehensive ground testing.
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    System optimization demonstrator for aircraft propulsion technology using fuel cells
    (University of Zilina, 2021) Uhlár, Erik; Čerňan, Jozef
    In order to help accelerate transition to sustainable and eco-friendly personal transportation in a single engine piston aircraft category we’ve developed a simulation software platform of hydrogen powered aircraft for further research and development. Measurements were carried out on a real reference airplane Cessna 172 R and were crosschecked with an airplane flight manual as well as a computer flight simulation. We also focused on a software-based safety and economy optimization by components usage ratio improvement and inflight energy production and transfer limitations.