Browsing by Subject "Hava ve Uzay"

Now showing 1 - 3 of 3
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    Mikro İnsansız Hava Aracı İçin Batarya Tüketim Modelinin Elde Edilmesi
    (2023) BARIS GOKCE; serkan çaşka
    İnsansız hava araçları günümüzde insanlar için tehlikeli ve zahmetli olabilecek birçok uygulamada kullanılmaktadır. Bu araçların kullanım alanını kısıtlayan en büyük etkenlerden biri batarya kapasitelerinin birçok uygulama için yeterli olmamasıdır. Son yıllarda, bu kısıtın ortaya çıkardığı zorlukları en aza indirmek için insansız hava araçlarının farklı etkenler altında batarya tüketimlerinin nasıl gerçekleştiğine dair çalışmalar olmuştur. Bu çalışmada mikro sınıfında bir insansız hava aracının yatay düzlemde farklı hızlarda hareket ettirilmesi durumunda oluşacak batarya tüketim değerleri deneysel olarak elde edilmiştir. Batarya tüketimine ait veriler kullanılarak doğrusal regresyon ve doğrusal olmayan regresyon yöntemleri ile batarya tüketim modelleri elde edilmiştir. Deneysel veriler ve modellerin başarısını gösteren sonuçlar tablo ve grafik halinde sunulmuştur.
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    A constructive heuristic for the heterogeneous drone delivery problem that considers packages' setups and battery capacity with the aim of minimizing weighted total waiting times of customers
    (2023) murat şahin
    This article considers the heterogeneous drone routing problem, which takes into account the setup times of customers’ packages and aims to minimize the weighted total waiting times of customers. Cases where drones differ from each other in terms of battery capacity, carrying capacity, speed and load capacity have been handled. The battery capacity has been associated with the payload carried by the drone as long as it stays in the air. A constructive heuristic has been suggested and many test instances have been used to show how the efficiency of the algorithm changes when different priority values are used. As a result, it has been seen that good solutions can be obtained by assigning the light customer packages to the fast drones for the given test instances by using the suggested constructive heuristic.
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    A NEW FORCE MEASUREMENT MECHANISM IN WIND TUNNEL: CFD AND EXPERIMENTAL VALIDATION ON A CYLINDER
    (2023) Seda Arabacı; Emre Kiraz
    Wind tunnel tests are experiments carried out in private and state-supported institutions, which are of great importance for studies in aerodynamics. Wind tunnels are essential in the defense industry, the automotive industry, and even the construction industry. In this study, a force sensor holder (FSH), in the open subsonic wind tunnel test room is designed, and it is made to measure angled structures, angled prototypes, and especially for wings. The critical angles of wings and the angles of attack are necessary, especially regarding aerodynamic performance. This force sensor holder can be adjusted at 0-90 degree angles and used experimentally. After holder manufacturing, experiments and CFD analysis are carried out at a 0 degree angle on the cylinder body. This study conducts a Computational Fluid Dynamics (CFD) analysis using Realizable k-ε, and SST k-ɷ turbulence models. In this study, the accuracy of the CFD analysis of the drag coefficient on a cylinder is evaluated through a comparison with both experimental and literature data. The results revealed that the CFD analysis has a deviation of 5,11% (using the Realizable k- model) and 5,22% (using the SST k- ɷ model) from the literature data. On the other hand, the experimental results show a discrepancy of 3,77% compared to the literature data. These findings demonstrate the effectiveness of the CFD analysis in predicting drag coefficients and highlight the importance of validating such simulations with experimental data.