Department of Aerospace Engineering, Article

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Recent Submissions

Orbit Control of an Earth Orbiting Solar Sail Satellite
Polat, Halis Can; Tekinalp, Ozan (2022-09-01)
A concept for the utilization of solar sail satellite's propellant-free thrust capability at Low earth orbit (LEO) is proposed and its orbit control strategy is analyzed. Thrust vector control of the sail's normal directio...
Numerical Validation of a Pyroshock Test System and Application to Qualification Tests
Yalçınkaya, Tuncay; Gursoy, Bahadir (2022-08-01)
Spacecraft are exposed to severe mechanical loads, i.e., shock loads, during their journey to orbit. Such loads usually develop due to a separation event through the activation of pyrotechnic devices. They might be transmi...
Experimental Modal Analysis of Nonlinear Amplified Piezoelectric Actuators by Using Response‑Controlled Stepped‑Sine Testing
Koyuncu, Anıl; Karaağaçlı, Taylan; Şahin, Melin; Özgüven, Hasan Nevzat (2022-08-01)
Fatigue and static damage in curved woven fabric carbon fiber reinforced polymer laminates
Tasdemir, Burcu; Çöker, Demirkan (2022-06-01)
Failure mechanisms of curved cross-ply laminates under static and fatigue loading have been studied extensively, but the examination of fabric laminates which are the most commonly used ply type in curved supports in airpl...
Critical Angle and Fundamental Frequency of Symmetric Airfoils at Low Reynolds Numbers
Kurtuluş, Dilek Funda (2022-05-01)
The unsteady vortex evolution of NACA 0012 airfoil is numerically investigated at low angles of attack ranging from 0 degrees to 10 degrees where the separation is performed from the trailing edge. The Reynolds number rang...
Single channel digital controller design for a high spinning rate rolling airframe missile
Suicmez, E. C.; Kutay, Ali Türker (2022-04-01)
Spinning/Rolling Airframe Missiles (RAM) mostly use an analog (ON-OFF type) control approach that deflects control surfaces (fins) at minimum and maximum positions continuously, and control is achieved by applying phase sh...
Development of a prediction model using fully connected neural networks in the analysis of composite structures under bird strike
Hasilci, Zehra; BOĞOÇLU, Muharrem Erdem; DALKILIÇ, Ahmet Selim; Kayran, Altan (2022-02-01)
Bird strike is one of the most hazardous issues facing global aviation. In the present study, a hybrid methodology is developed utilizing, automated data generation and fully connected neural networks to practically and re...
Discrete Adjoint-Based Aerodynamic Shape Optimization Framework for Natural Laminar Flows
Kaya, Halil; Tuncer, İsmail Hakkı (2022-01-01)
Published by the American Institute of Aeronautics and Astronautics, Inc., with permission.An adjoint-based aerodynamic shape optimization framework for natural laminar flows is developed. The laminar to turbulent-transiti...
A Two-Level Homogenization Approach for Polymer Nanocomposites with Coated Inclusions
GÜZEL, DİLEK; Gürses, Ercan (2022-01-01)
In polymer nanocomposites, other than the matrix and inclusion, a third phase so-called interphase, is commonly observed. Inter-phase properties affect the overall macroscopic mechanical behavior. It is crucial to model th...
Experimental Analysis and Multiscale Modeling of the Dynamics of a Fiber-Optic Coil
Kahveci, Oezkan; Gencoglu, Caner; Yalçınkaya, Tuncay (2022-01-01)
Fiber-optic gyroscopes (FOGs) are common rotation measurement devices in aerospace applications. They have a wide range of diversity in length and in the winding radius of the coil to meet system requirements. Every dimens...
The aerodynamic effects of blade pitch angle on small horizontal axis wind turbines
Kaya, Mehmet Numan; Uzol, Oğuz; Ingham, Derek; Köse, Faruk; Buyukzeren, Riza (2022-01-01)
© 2022, Emerald Publishing Limited.Purpose: The purpose of this paper is to thoroughly investigate the aerodynamic effects of blade pitch angle on small scaled horizontal axis wind turbines (HAWTs) using computational flui...
The Effect of Apical Vertebra Position on Growing Rod Treatment: A Clinical and Finite Element Study
DURSUN, GÖKAY; Cetik, Riza M.; GÜZEL, DİLEK; DEMİRKIRAN, HALİL GÖKHAN; Ramazanov, Rafik; Dede, Ozgur; Gürses, Ercan; Yazici, Muharrem (2022-01-01)
© 2022 Lippincott Williams and Wilkins. All rights reserved.Background: Growing rods (GRs) is a commonly utilized technique for the management of early-onset scoliosis. The significance of the position of the apical verteb...
Backup Magnetometer-only Attitude Estimation Algorithm for Small Satellites
Yakupoglu-Altuntas, Sirin; Eşit, Mehmet; Söken, Halil Ersin; Hajiyev, Chingiz (2022-01-01)
IEEEA different approach for attitude filtering integrates the filter with one of the static attitude estimators (e.g. QUEST) such that the filter uses the estimated attitude by this estimator as the measurement. Among sev...
Design and aerodynamic analysis of a VTOL tilt-wing UAV
Cakir, Hasan; Kurtuluş, Dilek Funda (2022-01-01)
The aerodynamic design and analysis of an Unmanned Air Vehicle, capable of vertical take-off and landing by employing fixed four rotors on the tilt-wing and two rotors on the tilt-tail, will be presented in this study. Bot...
Multiscale modelling for fusion and fission materials: The M4F project
Malerba, L.; et. al. (2021-12-01)
The M4F project brings together the fusion and fission materials communities working on the prediction of radiation damage production and evolution and their effects on the mechanical behaviour of irradiated ferritic/marte...
Void growth based inter-granular ductile fracture in strain gradient polycrystalline plasticity
Tandogan, I. T.; Yalçınkaya, Tuncay; Ozdemir, I (2021-12-01)
The precipitation hardened, high strength aerospace alloys (e.g. Al 7000 alloy series) suffer from loss of fracture toughness due to the heat treatment leading to intergranular ductile fracture. Depending on the quenching ...
Weight reduction of an unmanned aerial vehicle pylon fitting by topology optimization and additive manufacturing with electron beam melting
Yilmaz, Fatih; Şahin, Melin; Gürses, Ercan (2021-12-01)
The operating altitudeof unmanned aerial vehiclescan be affected by many parameters. Lightening the structural parts to achieve targetaltitudeis one of the design efforts. Weight reductioncan beachiev...
Understanding mechanical failure of graphite rocket nozzle throats under thermal stresses
Nigar, Barış; Dönmez, Serhan; Çöker, Demirkan; Özerinç, Sezer (2021-12-01)
© 2021 Elsevier Masson SASMechanical failure of graphite nozzle throats is a common problem of rocket engines. The extreme operating conditions constitute the main cause of the problem, resulting in thermal shock-induced c...
Vortex flow aerodynamics behind a symmetric airfoil at low angles of attack and Reynolds numbers
Kurtuluş, Dilek Funda (2021-11-01)
The low Reynolds number aerodynamics is important to investigate for micro air vehicle applications. The current paper covers numerical simulations to present the downstream development of the wake patterns and detailed an...
Prediction of ice accretion shapes on aircraft wings using open-source software
Edeeb, Seghaer; Akay, Hasan U.; Özgen, Serkan (2021-10-01)
Ice accretion on aircraft components starts when an aircraft flies through atmospheric clouds containing supercooled liquid droplets, which have a temperature below freezing point but are still in a liquid state. Ice accre...
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