Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 5 Articles
The drone was developed with the use of unmanned aircraft systems in the\ninitial military sector based on the combination of aerospace technology and\ninformation and communication technologies in a variety of usability, including\nthe civilian sectors. Developed for the field of reconnaissance, it is\nused in both civilian and police sectors as traffic monitoring and high altitude\nreconnaissance missions. It is used in broadcasting and surveillance, while\ncontinuously expanding into the areas of courier delivery and rescue missions.\nBased on the convergence of aviation technology such as various SW,\nsensor and flight control to utilize unmanned system and information communication\ntechnology, commercialization of related technology is being developed\nas a very diverse route. In this paper, we propose and manufacture of\na VTOL UAV. Design process referred to the VTOL development process that\nhas been devised by us, and actual building of a UAV also applied the same\nVTOL development concept. In order to understand the aerodynamic characteristics\nof the aircraft, we have applied the aerodynamic design theory and\nused the CAE method that can replace the actual wind tunnel test. We tested\nthe selection method and criteria for the internal modules that make up the\nUAV, and we were able to assemble the product. FW coding of flight control\ncomputer was conducted for VTOL control. In addition, we developed a LTE\ncommunication module for the long distance flight, and carried out flight\nexperiments with GCS to observe and respond to the flight situation from the\nground. Flight test results showed that stable transition flight was possible\nwith broadband. We could see that the actual performance results were met,\ncompared to our development target values....
Future aircraft design highly depends on the successful implementation of new technologies.\nHowever, the gap between conventional designs and new visions often comes with a high\nfinancial risk. This significantly complicates the integration of innovations. Scaled unmanned aircraft\nsystems (UAS) are an innovative and cost-effective way to get new configurations and technologies\nin-flight. Therefore the Institute of Aircraft Design developed the e-Genius-Mod taking into account\nall relevant similitude requirements. It is a scale model of the electric motor glider e-Genius. Since the\nReynolds number for the free-flight model cannot be adhered to, an airfoil was developed with\nlift-to-drag and lift-to-angle-of-attack courses reproducing the full-scale e-Genius flight characteristics.\nThis will enable testing and assessment of new aviation technologies in a scaled version with an\nopportunity for free-flight demonstration in relevant environment....
For this study, structural and manufacturing schemes for low-curvature pressurized\nfuselage panels were proposed, making it possible to provide high weight efficiency for the airframes\nof prospective civil blended wing-body (BWB) aircraft. The manufacturing scheme for low-curvature\npanels helped to achieve high strength characteristics of the composite details as well as decreased\nthe labor input necessary for manufacturing and assembling. The beneficial features of the proposed\nstructure are that the panels have a low weight, incur low manufacturing costs, and satisfy the\ndemands of repairability....
The airworthiness certification of aerospace cyber-physical systems traditionally relies\non the probabilistic safety assessment as a standard engineering methodology to quantify the\npotential risks associated with faults in system components. This paper presents and discusses the\nprobabilistic safety assessment of detect and avoid (DAA) systems relying on multiple cooperative and\nnon-cooperative tracking technologies to identify the risk of collision of unmanned aircraft systems\n(UAS) with other flight vehicles. In particular, fault tree analysis (FTA) is utilized to measure the\noverall system unavailability for each basic component failure. Considering the inter-dependencies\nof navigation and surveillance systems, the common cause failure (CCF)-beta model is applied to\ncalculate the system risk associated with common failures. Additionally, an importance analysis\nis conducted to quantify the safety measures and identify the most significant component failures.\nResults indicate that the failure in traffic detection by cooperative surveillance systems contribute\nmore to the overall DAA system functionality and that the probability of failure for ownship\nlocatability in cooperative surveillance is greater than its traffic detection function. Although all the\nsensors individually yield 99.9% operational availability, the implementation of adequate multi-sensor\nDAA system relying on both cooperative and non-cooperative technologies is shown to be necessary\nto achieve the desired levels of safety in all possible encounters. These results strongly support the\nadoption of a unified analytical framework for cooperative/non-cooperative UAS DAA and elicits an\nevolution of the current certification framework to properly account for artificial intelligence and\nmachine-learning based systems....
With the invention of the aircraft, it has become much faster and larger than\nthe original Wright Brothers aircraft. When the speed is high enough to cross\nthe speed of sound, air conditions will be different than that in low speed due\nto the existence of shock wave. In this work, we introduce several numerical\nways to analyze the performance of the airfoil when the speed is higher than\nthe speed of sound. With these numerical methods, we analyzed the performance\nof diamond-shaped airfoil under different angles of attack and speed.\nWith this data, engineers can choose a better airfoil to attain a lower drag\ncoefficient as well as lift coefficient when designing a high-speed aircraft....
Loading....