https://etalpykla.vilniustech.lt/handle/123456789/159377 Sat, 04 Apr 2026 16:10:41 GMT 2026-04-04T16:10:41Z https://etalpykla.vilniustech.lt/handle/123456789/160015 Improvement of Methodology of Calculation and Assessment of Transport and Operational Condition of Airfield Pavement (on the Example of Airport Pavements of Kyiv and Mykolaiv International Airports) Karpov, Viktor; Stepanchuk, Oleksandr; Dubyk, Oleksandr; Rodchenko, Oleksandr; Prentkovskis, Olegas The article presents the results of assessment and forecasting of transport and operational condition of airfield pavements on the example of airfield pavements of Kyiv and Mykolaiv International Airports. Domestic and foreign methods of assessment of transport and operational condition and calculation of airfield pavements have been analyzed. One of the most common methods of qualitative assessment of the transport and operational condition of airfield pavements is the method, the essence of which is to compare the classification numbers of aircraft and the bearing capacity of the pavement at the same strength of the subgrade. The results of calculation and design of airfield pavements were performed on the example of Kyiv and Mykolaiv International Airports using the FAARFIELD program. An alternative design of flexible airfield pavement of Kyiv International Airport is proposed. The engineering and geological conditions of Kyiv International Airport were analyzed in detail. Visual investigation of the surface of the pavements of all elements of the airfield of Kyiv International Airport showed that they have satisfactory transport and operational condition. The classification numbers PCN of rigid airfield pavements of Kyiv and Mykolaiv International Airports and flexible airfield pavement of Kyiv International Airport have been calculated with the help of the FAARFIELD program. PCN of the offered design of a rigid airfield pavement of the «Mykolaiv» International Airport is PCN 70/R/C/W/T. This means that the aircraft of this element of the airfield can perform take-off and landing operations without restrictions. Likewise, aircraft can perform take-off and landing operations without restrictions on rigid and flexible airfield pavements of «Kyiv» International Airport. Sun, 01 Jan 2023 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/160015 2023-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160014 Crack Open/Close Effect on Impedance Based System of Structural Health Monitoring Pavelko, Vitalis; Nagaraj, Pavithra The purpose of this article is to investigate the fatigue crack open/close effect to electromechanical impedance (EMI) of the system ‘host structure/ piezoelectric transducer’ and to estimate of efficiency of effect application for structural health assessment of aircraft structures. The experimental study was performed using the PI Ceramic a piezoelectric transducer PIC151 of 0.5 × 10 × 50 mm (PZT). Two types of the 1.14 mm aluminum alloy thin-walled samples were used as the host structures for testing of different geometrical configurations. The PZT were glued at the surface of sample by the Epoxy Paste HYSOL EA 9309.3 NA. The sample was subjected to static load of different levels and at each of them EMI and electrical capacitance of the piezoelectric transducer were measured by the impedance analyzer C60 (Cypher Instrument). Combined effect of the load and the boundary conditions (partial detachment of the sample fixing zone) was also investigated. In all tests the significant effect of load to the different signatures of the EMI and the PZT capacitance was observed. For the analysis, designing and calculations software like Cypher Graph, Microsoft Excel were used. The obtained results make it possible to assess the main properties of the effect of the fatigue crack open/close and demonstrate the sensitivity of different parts of EMI to the action of external load. Sun, 01 Jan 2023 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/160014 2023-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160013 Optimization of the Special Cargo Delivery by UAV Ayrapetyan, Anna; Ivannikova, Viktoriia During the pandemic, drones helped many FFCs access goods and services to the government and the general population. In response, many regulatory bodies worldwide have shown interest in helping the industry develop. Regulators are now looking for ways to support the development of drone technology by exploring ways to transport heavier goods and people. They are issuing more permits within existing frameworks and adopting more comprehensive frameworks to allow for more drone operations. Overall, drones are expected to play an essential role in all applications. This makes them an excellent solution for transportation applications. This study analyzes the role of unmanned aerial vehicles (UAVs) in delivering medical and emergency supplies to remote areas. It outlines potential considerations for operators wishing to use UAVs to provide medical and emergency supplies to remote locations. The article also discusses some practical considerations regarding the organization wishing to conduct such operations, the operations themselves, and the technology used. These considerations are primarily driven by the nature of the international regulatory framework for UAV operations and the specifics of using UAVs to deliver medical and emergency supplies. Sun, 01 Jan 2023 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/160013 2023-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/160012 Scavenging of a Two-Stroke Engine Rimša, Vytautas Investigation of a two-stroke engine scavenging phenomenon remains a significant issue due to its wide application in sports, the military, and other areas. The finite volume method is used to investigate the two-stroke engine scavenging process. Investigated cold flow study of internal combustion engine is targeting the process of identified and improve fluid flow inside the shaft, ports and muffler. The impact of the engine speed is examined it effect to pressure fluctuations and temperature inside engine, investigated sophisticated blades effect to engine scavenging performance for various blade angles and effect on the required torque. Sun, 01 Jan 2023 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/160012 2023-01-01T00:00:00Z