Department of Aerospace Engineering

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Recent Submissions

Paralel Moleküler Dinamik Simülasyonları ile Türbülanslı Akışların İncelenmesi
Adam, Ali Ata; Sezer Uzol, Nilay; Çıray, Cahit; Kabakcı, İsmail (2022-09-16)
Moleküler dinamik simülasyonları sürekli ortam varsayımının uygun olmadığı akış problemleri için kullanılabilir ve bu tür akış simülasyonlarında türbülans mikro ölçekte incelenebilir. Bu çalışmada, daha önce geliştirilmiş ...
Rüzgar Türbini Kanat Kesiti Aerodinamiğinin Optimize Edilmiş Sınır Tabaka Emme Sistemi ile İncelenmesi
Adam, Ali Ata; Sezer Uzol, Nilay (2022-09-15)
Rüzgar türbinlerine eklenen aktif akış kontrol sistemleri elde edilen enerjinin farklı akış koşulları boyunca en yüksek seviyede tutulabilmesi için kullanılabilmektedir. Bu çalışmada kontrol sistemleri içerisinde yer alan ...
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)
Journal of Physics: Conference Series PAPER • THE FOLLOWING ARTICLE ISOPEN ACCESS Effects of freestream turbulence on the wake growth rate of a model wind turbine and a porous disc
Öztürk, Buğrahan; Hassanein, Abdelrahman; Akpolat, Tuğrul; Abdulrahim, Anas; Perçin, Mustafa; Uzol, Oğuz (2022-06-05)
This study presents the results of an experimental investigation that focuses on quantifying the differences between the spreading rates of a model wind turbine wake and a porous disc wake at different freestream turbulenc...
Design of a gust generator and comparison of model wind turbine and porous disc wake flows in a transverse gust
Yığılı, İmge; Andırın, Mert Ali; Akpolat, Mehmet Tuğrul; Başkan Perçin, Özge; Perçin, Mustafa; Uzol, Oğuz (2022-06-05)
This paper outlines the similarities and di erences between the wake characteristics of a porous disc and model wind turbine under transverse gust loading which is generated via a two-vane wind tunnel gust generator. Phase...
Effect of blade contamination on power production of wind turbines
Özgen, Serkan; Sarlbel, Eda Bahar; Yaman, Ali Rlza (2022-06-02)
© Published under licence by IOP Publishing Ltd.Wind turbines suffer from considerable power losses because of contamination on their blades, that can be due to erosion, wear, smog, insect, sand and dust particle impact. B...
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...
EFFECTS OF INFLOW BOUNDARY LAYER ON THE WAKE CHARACTERISTICS OF A RADIALLY NON-UNIFORM POROUS DISC
Abdulrahim, Anas; Uzol, Oğuz; Perçin, Mustafa; Department of Aerospace Engineering (2022-1-03)
This thesis study presents the results of an experimental investigation focusing on the effects of inflow boundary layer on the wake characteristics of a porous disc (disc diameter-to-boundary layer height is 0.2) with rad...
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...
A Modification to Adaptive Control with Time-varying Learning Rate for Improved Transient Performance
Yayla, Metehan; Kutay, Ali Türker (2022-01-01)
© 2022, American Institute of Aeronautics and Astronautics Inc. All rights reserved.In this study, we propose a new adaptive weight update law using frequency-limited estimation of the matched uncertainty. Many adaptive pa...
Aeroelastic Model Corrections of a Very Light Aircraft; Implications on Static Trim, Flutter and Gust Response
Demirer, Halime Gül; Kayran, Altan (2022-01-01)
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.This paper discusses the aeroelastic model corrections employed in the static and dynamic aeroelastic analysis of a very light aircr...
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...
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