TR Dizin İndeksli Yayınlar Koleksiyonu / TR Dizin Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/20.500.14365/4
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Article Developing an Approach for Fault Detection and Diagnosis of Angular Velocity Sensors(2021-06-27) Nguyen, Dinh-dung; Nguyễn, Hồng Tiến; Tran, Hong Son; Tran, Thi Thuy; Quoc, Dat DangAngular velocity sensor detection and diagnosis become increasingly essential for the improvement of reliability, safety, and efficiency of the control system on aircraft. The classical methods for fault detection and diagnosis are limit or trend checking of some measurable output variables. Due to they do not give a deeper insight and usually do not allow a fault diagnosis, model-based methods of fault detection and diagnosis were developed by using input and output signals and applying dynamic process models. These approaches are based on parameter estimation, parity equations, or state observers. This paper presents an improvement method to build algorithm fault diagnosis for angular velocity sensors on aircraft. Based on proposed method, results of paper can be used in designed intelligent systems that can automatically fault detection on aircraft.Article A Compact Three-Rotor Vtol Development for Medical Drug Transfer(2024-01-31) Çiçin, Kürşat; Kankaya, Ali; Yalçınkaya, Fatma; Orhan, Hediye; Türker, Sena; Keskin, İlknur; Efe, Enes; Yavsan, Emrehan; İlknur,This work presents the development of a low-cost and low-power consumption vertical take-off and landing unmanned aerial vehicle (VTOL-UAV) with a simple and innovative design approach. The VTOL-UAV is capable of runway-independent flight and has the ability to carry payloads such as medical drug boxes. The hull volume of the UAV has been maximized to enhance its carrying capacity, while a three-rotor configuration has been implemented to simplify the design, reduce costs, extend flight time, and minimize weight. The wing-mounted rotors are strategically positioned in vertical and horizontal orientations to ensure stable flight during take-off, landing, and cruise phases. The wings are detachable, enabling rapid repairs in the event of accidents. Powered by an advanced flight controller, the VTOL-UAV is capable of autonomous flight, making it suitable for delivering supplies and medical provisions to remote, hazardous, or emergency areas. Moreover, the UAV has the capability to operate at higher altitudes, avoiding obstacles in urban transportation. Overall, this work demonstrates the feasibility of developing a cost-effective and efficient VTOL-UAV with a straightforward design approach for diverse applications, including medical delivery and urban transportation.Article Numerical Simulation of Different Ventilation Systems in an Airplane Cabin(2022-12-26) Özerdem, Barış; Bilir, Levent; Celik, HasanAirplanes are the most popular way of transportation worldwide, especially for long haul. It facilitates the growth of global trade as well, besides promoting tourism and other employment developments. Passenger comfort and hygiene inside an airplane cabin became main concern for aircraft manufacturers. The possibility for a potential spread of infectious virus or bacteria even maximized this concern. Therefore, supplying sterile and particle-free air inside the aircraft cabin became extremely crucial more than ever. In order to ensure comfort and hygiene, regardless of the environment conditions inside the aircraft cabin, paved the way for researchers to focus on this topic, recently. It is obvious that, an important precaution for the spread of micro-organisms can be selecting an adequate air ventilation system inside the airplane cabin. In this study, a part of an airplane passenger cabin is modelled for four different scenarios. The streamlines of air, which is sent to the cabin from air ducts, are obtained and air flow path is observed for the investigated cases. The results of the numerical simulations are presented as the outcomes of this study. It is observed that the air mixing between different seat rows occur slightly only for sidewall supply and bottom return mixing ventilation and displacement ventilation systems, whereas the air mixing for the same seat row is seen for all ventilation systems. In conclusion, sidewall supply and bottom return mixing ventilation system is found the most appropriate one, even though it causes air recirculation at the same row seats.Article Hava Gücünün Tarihi Gelişimi: Nitelikler, Bileşenler, Görevler ve Etkinlik Açısından Bir Değerlendirme(2021-09-27) Egeli, SıtkıBu çalışmada, hava gücünün ortaya çıkmasından bu yana geçen 100 yılı aşkın sürezarfındaki tarihî gelişim sürecinin ikincil kaynakları kullanan nitel araştırma yaklaşımıylaincelenmesi neticesinde, özellikle Soğuk Savaş sonrası dönemde yaygınlık kazanan havagücünün kara ve deniz güçleri karşısında baskın konuma geçerek artık savaşların sonucunutek başına belirleyebileceği önermesinin sahadaki gelişmelerle çeliştiği, zira hava gücününkullanımı sayesinde elde edilen fırsatların ve avantajların taktik, stratejik ve/veya siyasîsonuçlara dönüştürülebilmesi için satıhta konuşlanmış kuvvet unsurlarına hâlâ ihtiyaçduyulduğu sonucuna ulaşılmıştır. Varılan bu sonuçla bağlantılı olarak, incelenen dönemdeyaşanan süratli teknolojik gelişmelere rağmen hava gücünün kuvvetli-zayıf yönlerinin ve ifaettiği görev kategorilerinin yıllar içerisinde büyük oranda aynı kaldığı görülmüştür. Ayrıca,hava gücünün potansiyelinden tam manasıyla yararlanılabilmesinin sadece az sayıdadevletin sahip olduğu maddi, teknolojik, örgütsel ve entelektüel kapasitenin kazanılmasınıgerekli kıldığı gözlemlenmiştir.Article Citation - WoS: 16Citation - Scopus: 19Comparative Analysis of Multicriteria Decision Making Methods for Postgraduate Student Selection(Ani Yayincilik, 2010) Altunok, Taner; Özpeynirci, Özgür; Kazancoglu, Yigit; Yilmaz, Recai; Özpeynirci, Nail ÖzgürProblem Statement: The educational recourses available for postgraduate education are limited compared with the resources for undergraduate education. An academic advisor is required for each graduate student. The academic staff allocates an important portion of his/her time for graduate studies of his/her students. Since the number of academic staff is limited, the number of graduate students should be limited, too. While a large number of students may attend an undergraduate course, this may not be possible for some graduate courses, which are designed especially for small student groups. Hence, the selection of postgraduate students is an important problem. The postgraduate student selection problem can be defined as selecting a subset of students from the applicants for a postgraduate program. Naturally, this problem is a multi-criteria decision-making problem since each applicant has several attributes and these attributes should be considered simultaneously during the selection process. Purpose of Study: The purpose of this study is to compare the performance of different multi criteria decision-making methods developed for ranking alternatives for the postgraduate student selection problem. The best method will also be used in the student selection process for the Defense Sciences Institute of Turkish Military Academy. Methods: This paper discusses three multi-criteria decision making methods developed for ranking alternatives, namely Analytic Hierarchy Process (AHP), Weighted Product (WP) and the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). A performance measure is defined and the performance values of the methods are compared using real data gathered from the graduates of Defense Sciences Institute of Turkish Military Academy for illustration purposes. Findings and Results: According to the findings, AHP is the best of the three competitors. The ranking obtained by AHP is quite similar to the ranking of students with respect to their cumulative grade point average (CGPA) after their graduation from the program. Conclusions and Recommendations: Considering graduate student selection problem as a multicriteria decision-making problem is very important and enables universities to enroll graduate students with important attributes and a variety of strengths. This paper compares the performance of different multicriteria decision-making methods on graduate student selection problem using a single performance measure. A further study can be making such a comparison with multiple performance measures.Article Citation - WoS: 11Citation - Scopus: 14Making Sense of Turkey's Air and Missile Defense Merry-Go(Center Foreign Policy & Peace Research, 2019) Egeli, SitkiAt some point during 2013, Turkey's political authority began to treat the in-country development and production of long-range air and missile defense systems as a priority. Soon after, they announced their decision to favor a Chinese offer that came complete with licensed production and the promise of technology transfer. Yet, with this decision came NATO's objections and challenges around integration and information security. The 2015 decision to rollback the pro-China decision, and opt instead for the indigenous development of air and missile defense systems (in close conjunction with a foreign technological and industrial partner) was triggered by Turkey's disillusion with the content of China's technology transfer package. Subsequently, this new partner became a team comprising France and Italy; Turkish industry tied itself to this team in developing Europe's next-generation missile defense capability. Then came the Turkish government's 2017 decision to purchase off-the-shelf, standalone S-400 systems from Russia. This decision was an anomaly, and had all the characteristics of a top-down decision cycle running afoul of technical, operational, and industrial criteria. Turkey's political figures have justified the S-400 order by citing the benefits of in-country production, access to technologies, not to mention the West's refusal to sell comparable systems; but these justifications have been refuted by the Russian side and/or in discordant statements by Turkish institutions, authorities, and political figures themselves.Article Citation - WoS: 1Citation - Scopus: 1Humanoid Robot Arm Design, Simulation, Kinesthetic Learning, Impedance Control and Suggestions(Gazi Univ, Fac Engineering Architecture, 2022-02-28) Ertugrul, Seniz; Kaya, Ozan; Turkmen, Dila; Eraslan, Hulya; Taglioglu, Gokce Burak; Gulec, Musa OzgunRobot technology is constantly developing and the studies in this field are also increasing in our country. Universities, machine-manufacturing and defense industry have been either doing or planning robot projects. This study presents designing of a humanoid robot arm desired to be cooperative so that it can work as dual arm or with human operator. Mechanical design, kinematic and dynamic analysis, kinesthetic learning, impedance control, software and hardware studies were carried out within the scope of the study. The stages from the initial design of the humanoid robot arm to the control, the problems encountered, the experiences gained and the suggestions for advanced designs are shared in a very comprehensive way in this article. It has been explained in an easy-to-understand manner in order to be useful for national robot projects which are being developed especially for commercial purposes. Mechanical design, dynamic analyses, simulation and other files will be shared as open source with interested researchers.