This paper analyzes a method of evaluating the reliability of the rolling bearing in anti-aircraft guns. In evaluating its reliability, the factors that depend on the operating conditions of the anti-aircraft gun are taken into account, as well as the factors of design, technology, materials and assembly
Utilizing a photovoltaic system to power an Unmanned Aerial Vehicle (UAV) enables longer and extended flights. A hybrid energy system, consisting of three distinct energy sources, was investigated. A technical solution was developed to optimize the energy system and mitigate transient effects observed during power source switching. Through a long-term aerial monitoring mission simulation, the study demonstrated the efficiency and reliability of the energetic management system for a solar-powered UAV in providing a constant and stable power supply to the grid throughout the flight. The findings of this study have implications for the development of high-performance UAVs by ensuring optimal and efficient selection of suitable energy sources for flight conditions and uninterrupted power supply to electrical consumers, minimizing operational risks
UAVs are increasingly used for tasks such as surveillance, monitoring, and inspection, but their effectiveness is limited by their energy storage and generation capacity. Therefore, optimizing the energy system of a solar-powered UAV is crucial to extend its range and duration, and numerical modeling can help achieve this goal. In this particular study, researchers focused on a solar-powered UAV with a 151 cm wingspan. They used three different energy sources to power the UAV, and then simulated its performance using numerical modeling. The aim was to find the optimal energy source for each stage of flight and ensure a steady and efficient power supply throughout the entire mission. The findings of this study have important implications for the development of new UAVs with exceptional performance
Even after the End of the First World War in the West, the Romanian people had to continue their struggle to achieve the goals for which they had decided to join the Entente in August 1916, namely to defend and impose – politically, diplomatically or by force – the decisions of the Plebiscite for National Union adopted by the governing bodies and the legitimacy of the Romanian Nation in Chisinau, Cernauti and Alba Iulia. The victorious campaign against Bolshevism in the East, North and West, together with the Decisions adopted by the Great Powers within the system of the Peace Treaties in Paris, agreed and recognized the new political-geographical reality of Greater Romania in the area designated roughly by the Danube and the Carpathians. And this great historical achievement had to be defended and consolidated, including by modernizing the Romanian Royal Aeronautics and perfecting the specific processes of training and developing human resources, able to set in motion the new operational challenges generated by the technological progress in air capabilities and new doctrines of use.
