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Recent Submissions

In-situ observation and numerical study of dynamic delamination in tapered composite laminates Dashatan, Saeid Hosseinpour; Parnas, Kemal Levend; Çöker, Demirkan; Bozkurt, Mirac Onur; Ozen, Emine Burcin (2023-05-15) In this study, dynamic delamination behavior in asymmetric GFRP tapered laminates under quasi-static tensile loading is investigated experimentally and numerically. Abaqus/Explicit cohesive interface modeling is utilized t...
Optimization of reward shaping function based on genetic algorithm applied to a cross validated deep deterministic policy gradient in a powered landing guidance problem Nugroho, Larasmoyo; Andiarti, Rika; Akmeliawati, Rini; Kutay, Ali Türker; Larasati, Diva Kartika; Wijaya, Sastra Kusuma (2023-04-01) One major capability of a Deep Reinforcement Learning (DRL) agent to control a specific vehicle in an environment without any prior knowledge is decision-making based on a well-designed reward shaping function. An importan...
Leading-Edge Vortex Characteristics of Surging-Translating Flexible Wings YAZDANPANAH, MAHDI; Perçin, Mustafa (2023-01-31) This study experimentally investigates the flow fields around rigid and chordwise-flexible wings, performing a rectilinear translational motion starting from rest. A rigid wing and two flexible wings with an intermediate d...
Creating tougher interfaces via suture morphology in 3D-printed multi-material polymer composites by fused filament fabrication Altuntas, Umut; Çöker, Demirkan; Yavas, Denizhan (2023-01-05) This study presents a facile strategy for architecting the interface morphology to create tougher and stronger interfaces in additively manufactured multi-material polymer composites. A sutural interfacial morphology betwe...
Wake patterns and mode switching at low Reynolds numbers Naeem, Nabih; Fouda, Mahmoud; Guney, Mertcan; Kurtuluş, Dilek Funda (2023-01-01) Instantaneous wake structures behind a 2% thick NACA 0002 symmetric airfoil are numerically studied in 2D at six different angles of attack for Reynolds numbers ranging from 100 to 3,000. Classification of the flow pattern...
Incorporating delayed star tracker measurements in Gokturk-2 satellite attitude filter Kahraman, Ozgur; Söken, Halil Ersin (2023-01-01) Star trackers (STRs) are widely used for fine attitude estimation. Due to the processing time for tasks such as star identification, tracking, and attitude solution, a STR can provide the attitude quaternion measurements w...
Unsteady aerodynamic performance of SD7062 airfoil at high Reynolds number Anilir, Berkan; Kurtuluş, Dilek Funda (2023-01-01) Aerodynamic performance of SD7062 airfoil in two-dimensional unsteady flows at high Reynolds number (Re approximate to 5 x 10(6)) has been investigated numerically for a wide range of angles of attack. The k-omega SST turb...
Crack propagation in the Double Cantilever Beam using Peridynamic theory Yolum, Ugur; Bozkurt, Mirac Onur; Gok, Eda; Çöker, Demirkan; Gueler, Mehmet Ali (2022-12-01) In this study, Peridynamic (PD) theory is used to model mode-I delamination in unidirectional and multi-directional laminated composites. Experiments are conducted to determine mode-I fracture toughness in a unidirectional...
Real-Time Attitude Independent Calibration of Spinning Spacecraft Magnetometers Using Quasi-Measurements Cetin, Mustafa Efe; Söken, Halil Ersin; Sakai, Shin-ichiro (2022-11-01) Magnetometers are essential sensors for attitude estimation in small spacecraft due to their robust, inexpensive, and lightweight characteristics. However, the raw measurements contain sensor errors. These errors degrade t...
Development and implementation of a micromechanically motivated cohesive zone model for ductile fracture Tandogan, I. T.; Yalçınkaya, Tuncay (2022-11-01) Gaining popularity after its coupling with the finite element method, cohesive zone mod-eling has been used extensively to model fracture, especially in delamination problems. Its constitutive relations, i.e. traction-sepa...
Monte-Carlo simulations based hub height optimization using FLORIS for two interacting onshore wind farms Kutukcu, Gokay; Uzol, Oğuz (2022-11-01) This study focuses on finding the optimum hub height (i.e., tower height) distributions for two interacting on-shore wind farms that are located on relatively complex terrain. Different optimization scenarios are studied, ...
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...
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)
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...
Numerical investigations on flashback dynamics of premixed methane-hydrogen-air laminar flames Kıymaz, Tahsin Berk; Böncü, Emre; Güleryüz, Dilay; Karaca, Mehmet; YILMAZ, BARIŞ; Allouis, Christophe Gerard; Gökalp, İskender (2022-07-12) © 2022 Hydrogen Energy Publications LLCInjecting hydrogen into the natural gas network to reduce CO2 emissions in the EU residential sector is considered a critical element of the zero CO2 emissions target for 2050. Burnin...
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...

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