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Öğe A Comparative Study between Paper and Paperless Aircraft Maintenance: A Case Study(MDPI, 2023) Karakılıç, Elif; Günaltılı, Enes; Ekici, Selcuk; Dalkıran, Alper; Ballı, Özgür; Karakoç, Tahir HikmetThe rapid growth of airlines over the last period has led to the development of the aviation industry, resulting in increased requirements for ancillary services. Nowadays, the demand for the use of paper-based documents is increasing day by day as airlines encourage passengers to use more ancillary products. One of the most important issues in the aviation industry is flight safety. The procedures and instructions required for all aviation operations are organized in accordance with the regulations and printed on paper in accordance with the demands. For this reason, since it is mandatory to keep all aircraft maintenance, repair, and operation records on printed paper and to keep them for a certain period of time, aircraft fly with almost their entire weight on paper. Considering the global hazards in the world, although the aviation sector is the least environmentally damaging of all transportation sectors, new solutions have been sought to make aviation operations less harmful to the environment, minimize errors and risks, allow for faster communication, and be safer and more sustainable. In order to meet the demands, studies on reducing the use of paper have been brought to the agenda. In this study, after a literature review, real data from a maintenance, repair, and overhaul organization are used to suggest digital conveniences that can save costs, increase productivity, save space, facilitate documentation and information sharing, keep personal information more secure, and help the environment through paperless living.Öğe Comparison of MPPT algorithms under different environmental conditions for solar powered high altitude platforms(American Institute of Aeronautics and Astronautics Inc, AIAA, 2023) Küçükkör, Özge; Karakoç, Tahir Hikmet; Durak, UmutEnergy management is one of the most crucial issues for the solar powered High Altitude Platforms (HAPs). In UAVs with solar panels, sufficient power shall be provided to run the equipment on the vehicle and charge the battery during long flights. To provide this generated power to all these components in the most precise and efficient way, Maximum Power Point Tracking (MPPT) is an excellent option. There are some critical circumstances that affect the performance of the MPPT in the aircraft. Flight conditions affect the power that can be acquired from the photovoltaic (PV) panel on the UAV. In this article, irradiance values which are one of the input parameters of the PV panel are calculated by taking the altitude at 25 km and latitude at a 45° as flight conditions of the HAP as the reference. Under these conditions, the average irradiance values at 12:00 P.M. are calculated for each month of the year and efficiencies for different MPPT algorithms under these conditions has been discussed. © 2023, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.Öğe A comprehensive review of state-of-art FishBAC - fishbone active camber morphing wing surfaces-: A promising morphing method(Emerald Group Publishing Ltd, 2024) Özbek, Emre; Ekici, Selçuk; Karakoç, Tahir HikmetPurposeThe current research conducts a comprehensive review on FishBAC (fishbone active camber morphing wing surfaces) for researchers and scientists and sheds light on challenges and opportunities of FishBAC development. Design/methodology/approachThis is a review article and this study reviews previous research on FishBAC.FindingsThe current FishBAC applications could be upgraded into more efficient designs in materials, design and mechanisms with more perspectives involved. Then, this promising branch of morphing surface design could be integrated with rotor blades, unmanned aerial vehicle wings, general aviation aircraft surfaces and so on.Research limitations/implications. This is a review article.Practical implicationsThe contributions of the study are summarized as follows: to provide an overview of FishBAC research; to compare various approaches and trends in FishBAC designs; to address the research gap in the roadmap for FishBAC design; and to discuss the challenges and opportunities of FishBAC development. Originality/valueTo the best of the authors' knowledge, this is the first review on a promising morphing method and an alternative for conventional flaps and ailerons.Öğe Cruise altitude patterns for minimizing fuel consumption and emission: A detailed analysis of five prominent aircraft(Elsevier, 2024) Ekici, Selçuk; Ayar, Murat; Orhan, İlkay; Karakoç, Tahir HikmetThis study conducts a comprehensive analysis of fuel consumption and emissions associated with the installation of the most commonly used engine combinations currently available on five distinct types of BADA 4 (Base of Aircraft Data), ANP (Aircraft Noise and Performance), and AEM (Advanced Emissions Model) aircraft supplied by two distinct aircraft manufacturers to the civil air transport sector. The comparison spans a total of 18 flight scenarios (90 flights) for each aircraft, ranging in altitude from FL300 to FL385. To achieve this, the research employs a comprehensive approach encompassing data acquisition from EUROCONTROL’s Integrated Aircraft Noise and Emissions Modelling Platform (IMPACT), robust data analysis, and advanced statistical techniques. The goal of this study is to investigate variations in fuel consumption and emissions at different cruising altitudes for various commercial aircraft types, assessing the veracity of the commonly assumed decrease in fuel consumption and associated emissions with altitude, and exploring the impact of individual aircraft assessments on the precision and comprehensiveness of environmental impact assessments in civil aviation flight operations. The work seeks to answer the following the main research question: Does every aircraft’s fuel consumption and related emissions truly decrease with increasing altitude, according to conventional methodologies and general assumptions?Öğe Decision mechanism between fuel cell types: A case study for small aircraft(Elsevier Ltd, 2023) Ayar, Murat; Karakoç, Tahir HikmetResearch has focused on green energy alternatives that can be used instead of fossil fuels to reduce aviation-related emissions and achieve zero-emission targets. One of the most promising alternatives is hydrogen-based fuel cells. Determining the fuel cell type closest to the hydrogen side solution to the airplane emission problem will help guide the researchers working on this issue. Multi-criteria decision-making methods were used for the first time in applying fuel cells to aircraft. The study will pioneer the use of MCDM methods in determining the usability of fuel cells in other areas and vehicles. This study proposes a decision mechanism to evaluate the most suitable fuel cell type integrated into a normal class small aircraft hybrid powertrain. Accordingly, the decision problem was transformed into a hierarchical structure by determining five fuel cell alternatives and twelve criteria in consultation with expert decision-makers. The decision problem has been solved with the Analytic Hierarchy Process, one of the multi-criteria decision-making methods in accordance with its structure. The results showed that PEM fuel cells are best suited for integration into hybrid aircraft, with in power-related criteria such as Specific power, Power density, and Power capacity. Also, our results cast a new light on the properties of fuel cells to be considered for use in aircraftÖğe Editorial of VSI IGEC 2023(Elsevier Ltd, 2024) Karakoç, Tahir Hikmet; Yu, Zhibin; Ekici, Selçuk; Zhao, Jian[No abstract available]Öğe Enerji verimli binalarda co2 emisyon ölçütleri ve ekserji kavramı(Turkish Society Of Hvac & Sanitary Engineers, 2014) Söğüt, Mehmet Ziya; Karakoç, Tahir Hikmet; Ekmekçi, İsmailBu çalışmada öncelikle farklı derece gün bölgeler için örnek alınan bir binanın yalıtımlı, TS825 sınırları ve yalıtımsız özellikleri dikkate alınarak ekserji analizlerine bağlı etkinliği incelenmiştir. Daha sonra bu kriterlere bağlı emisyon yükleri; her bölge için uluslararası kabul ölçütü(IPCC), genel yaklaşım ve karbon salım metriği ölçütü dikkate alınarak ayrı ayrı hesaplanmış ve sonuçlar karşılaştırılmıştır. Referans alınan karbon ölçütleri arasında %97 ve %42,26‘lık gibi önemli farklar bulunmuştur. Çalışmanın sonunda emisyon ölçütü olarak karbon salınım metriğinin sağladığı faydalar ile bina analizleri için ekserji kavramının önemi vurgulanmıştır.Öğe Guest editorial: The significance of clean and energy-efficient operations in sustainable aviation(Emerald, 2023) Karakoç, Tahir Hikmet; Colpan, Can Özgür; Yetik, Ozge; Dalkıran, AlperAir transportation should be done using clean energy resources and technologies, without causing environmental pollution, and in energy-efficient, economical, safe and fast ways. In short, it must be sustainable. Many developed countries have set net-zero emission targets for the near future. To achieve this goal, it is necessary to consider many factors. The first of these is to use efficient aircraft technology by using less energy and fuel. In this way, lower life cycle emissions can be produced. By using sustainable aviation fuel (SAF), CO2 emissions to the environment can also be reduced. Some typical feedstocks used are cooking oil, animal waste, solid waste from homes, forestry waste and energy crops. Improvement in operations and infrastructure is also another critical factor for sustainable aviation. It is possible to use less energy on the ground or to reduce the fuel consumed by choosing the optimum flight path. To make the airports sustainable, there are also issues such as reducing the maintenance costs of the devices, increasing the lifetime of the buildings and making the lighting, heating and cooling more economical. To ensure all this, researchers from around the world work together on materials and aircraft component development testing, wind tunnel testing, emissions and combustion testing, computational modeling and simulations.Öğe Past and current components-based detailing of particle image velocimetry: A comprehensive review (vol 9, e14404, 2023)(Cell Press, 2023) Rohacs, Daniel; Yaşar, Onur; Kale, Utku; Ekici, Selçuk; Yalçın, Enver; Midilli, Adnan; Karakoç, Tahir Hikmet[Abstract Not Available]
