Hybrid journal (It can contain Open Access articles) ISSN (Print) 2050-0467 - ISSN (Online) 2050-0475 Published by Inderscience Publishers[439 journals]
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Authors:Hasan Kinatas, Chingiz Hajiyev Pages: 191 - 204 Abstract: In this study, a fault tolerant attitude estimation system is proposed for a nanosatellite, combining the TRIAD algorithm, a vector-based attitude determination method, with an adaptive extended Kalman filter. As the first step of the estimation system, the TRIAD algorithm produces an initial coarse attitude estimation using three-axis magnetometer and sun sensor measurements. Then, this coarse estimation is filtered via an adaptive extended Kalman filter to obtain the final estimation. Besides filtering and providing more accurate estimations, the adaptive filter also makes the system fault tolerant by maintaining the estimation accuracy in cases where sensor faults exist and measurements become unreliable. This is made possible by tracking the filter's innovation history and re-adjusting the Kalman gain using appropriately calculated fading factors. In order to verify the performance of the proposed system, two different simulations are performed where the attitude sensor outputs are disturbed by additional measurement noise. Keywords: nanosatellite; attitude estimation; adaptive Kalman filtering; fault; magnetometer; sun sensor Citation: International Journal of Sustainable Aviation, Vol. 9, No. 3 (2023) pp. 191 - 204 PubDate: 2023-07-11T23:20:50-05:00 DOI: 10.1504/IJSA.2023.132115 Issue No:Vol. 9, No. 3 (2023)
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Authors:Orawan Nugprachaya, Poowin Bunyavejchewin Pages: 205 - 219 Abstract: From 2000 to 2019, a total of 31 airline firms were launched in Thailand but then shut down, mostly within a short period of time. Although a vast array of factors could contribute to airline failures, this study focuses on pitfalls in the airline fleet planning process, notably equipment selection and acquisition. Of the 31 defunct airlines, PC Air, a short-lived charter carrier, was selected for analysis since it was an extreme case study, representing a textbook pitfall trap in which airline firms have rarely fallen into in real-world aviation business situations. In the PC Air case, flawed fleet planning was a clear-cut error behind its collapse. This was exemplified through the unsound selection and acquisition of the used aircraft, which mismatched the airline's mission and contradicted the charter carrier business model, and via its ill-advised decision to conduct commercial operations with only one aircraft. Keywords: airbus; A310-200; aircraft acquisition; aircraft selection; charter carrier; defunct Thai airlines; fleet management; fleet planning; PC Air; Thailand Citation: International Journal of Sustainable Aviation, Vol. 9, No. 3 (2023) pp. 205 - 219 PubDate: 2023-07-11T23:20:50-05:00 DOI: 10.1504/IJSA.2023.132112 Issue No:Vol. 9, No. 3 (2023)
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Authors:Demet Canpolat Tosun, Yasemin Işık Pages: 220 - 239 Abstract: The aim of this study is to design and implement a model reference adaptive control system for a quadrotor. The quadrotor model is the Qball-X4, a testbed developed by Quanser Inc. For control purposes, the mathematical model of the quadrotor is examined in detail. The simulation studies are performed using the mathematical model and appropriate controller parameters in the MATLAB/Simulink simulation environment. Different reference models and adaptation rates are tested according to the model reference adaptive control procedure. After obtaining satisfactory results in the simulation environment, the purposed control system is implemented on the real system. The motion of the vehicle in the X, Y, and Z axes is observed and the results are presented with graphics for different flight tests. Keywords: model reference adaptive control; MRAC; Qball-X4; MATLAB/Simulink; reference model; adaptation rate; motion control Citation: International Journal of Sustainable Aviation, Vol. 9, No. 3 (2023) pp. 220 - 239 PubDate: 2023-07-11T23:20:50-05:00 DOI: 10.1504/IJSA.2023.132118 Issue No:Vol. 9, No. 3 (2023)
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Authors:Sandro Domitran, Marina Bagić Babac Pages: 240 - 261 Abstract: There are many different tasks that got revolutionised with the arrival of UAVs in the last couple of years. Most of them are solved either by using multi-rotors or airplanes, which both have some strengths and weaknesses. While multi-rotors can fly precisely and take off and land almost anywhere, they are not as efficient as planes as they are able to generate lift using wings. This work proposed an aircraft that is a combination of those two, so the strengths are preserved, and weaknesses eliminated. The built prototype is a tail-sitter aircraft which is mechanically the simplest VTOL aircraft type. It takes off and lands as a multi-rotor, and it is able to transition into fixed-wing flight while in mid-air. The outdoor experiments verified its behaviour while hovering, while transitions and fixed-wing flight are only verified using simulation. In addition, it was also able to perform a simple task using machine learning. Keywords: ArduPilot; machine learning; PID; RealFlight; simulation; software in the loop; SITL; tail-sitter; transition; VTOL Citation: International Journal of Sustainable Aviation, Vol. 9, No. 3 (2023) pp. 240 - 261 PubDate: 2023-07-11T23:20:50-05:00 DOI: 10.1504/IJSA.2023.132116 Issue No:Vol. 9, No. 3 (2023)
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Authors:Mehmet Necati CizrelioÄŸullari, Tapdig Ä°manov Pages: 262 - 278 Abstract: Innovation of the air transportation system is crucial on all stages of its development, which requires continuous support. Modernisation of ageing equipment, development of new generation (NG) aircrafts and its systems makes necessary shifts to a next generation (NextGen) aviation industry era. This study compares the existing technologies of the air transportation system used in Turkey's aviation industry with the NextGen concept and its main pillars for the development of new elements. This study also examines the feasibility of leveraging new elements of the NextGen concept that would efficiently use the national airspace, which include satellite-based navigation and surveillance, advanced digital communications, integrated air traffic management, and wide information sharing systems. Taking into account the increasing trend of development of the international and regional air transportation network from/to Turkey in the near future, it is considered appropriate to apply the concept of NextGen in the Turkish aviation industry in order to avoid difficulties in managing airspace. The results of the study state several benefits upon application of NextGen elements, but expected cost issues need to be defined by the government to invest in its implementation and development. Keywords: air transportation; next generation; NextGen; airspace; aviation; Turkey Citation: International Journal of Sustainable Aviation, Vol. 9, No. 3 (2023) pp. 262 - 278 PubDate: 2023-07-11T23:20:50-05:00 DOI: 10.1504/IJSA.2023.132114 Issue No:Vol. 9, No. 3 (2023)
Hybrid journal (It can contain Open Access articles)
