Department of Aerospace Engineering

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Recent Submissions

Experimental study on efficient propulsion system for multicopter UAV design applications Goli, Srikanth; Kurtuluş, Dilek Funda; Alhems, Luai M.; Memon, Azhar M.; Imran, Imil Hamda (2023-12-01) The usage of multicopter unmanned aerial vehicles (UAVs) has increased for various military and civilian purposes. The choice of propulsion system of such a vehicle is crucial to fulfill the intended mission requirements. ...
A numerical ballistic performance investigation of Armox 500T steel through ductile damage models Göçmen, Yağmur; Erdoğan, Can; Yalçınkaya, Tuncay (2023-11-15) In this work, the ballistic response of an armor steel, Armox 500T, is numerically investigated through finite element (FE) analysis by utilizing the Johnson–Cook (JC) and modified Mohr–Coulomb (MMC) damage models, with a ...
A Numerical Study on the Ballistic Performance of Projectiles Formed by Shaped Charge Göçmen, Yağmur; Erdoğan, Can; Yalçınkaya, Tuncay (2023-11-01)
Analog sun sensor measurement correction using deep neural network Söken, Halil Ersin; Sozen, Semsettin Numan; Gokce, Murat; Yavuzyilmaz, Cagatay; Gulmammadov, Farid (2023-10-01) Sun sensors are commonly used attitude sensors because of their low cost, mass, volume, and power consumption. Analog Sun sensors (ANSS), which are smaller but usually less accurate than digital ones, are especially prefer...
Ductile failure of Inconel 718 during flow forming process and its numerical investigation Erdoğan, Can; Vural, Hande; Karakaş, Aptullah; Fenercioğlu, Tevfik Ozan; Yalçınkaya, Tuncay (2023-10-01) Understanding the fracture mechanisms and predicting failure in forming processes is of great interest to increase formability and numerical methods have been proven effective. Incremental forming processes such as flow fo...
Full envelope nonlinear flight controller design for a novel electric VTOL (eVTOL) air taxi Suiçmez, E.C.; Kutay, Ali Türker (2023-10-01) On-demand urban air transportation gains popularity in recent years with the introduction of the electric VTOL (eVTOL) aircraft concept. There is an emerging interest in short/medium range eVTOL air taxi considering the cr...
Estimating Sweet Spot for UAV Formation Flight Using Vortex Lattice Method and Machine Learning Tatar, Umutcan; Kahveci, Harika Senem (2023-09-15)
Aerodynamics of Close-coupled Stationary/Flapping Tandem NACA 0012 Airfoils Anilir, Berkan; Kurtuluş, Dilek Funda; Platzer, Max (2023-06-12) Two-dimensional numerical simulations of low-speed flow past close-coupled tandem NACA0012 airfoils are presented. A sinusoidally plunging airfoil is placed at 0.1c downstream of a stationary airfoil to investigate how the...
Extended Sliding Mode Control Scheme for a VTOL UAV with Time-Varying Disturbances Imran, Imil H.; Memom, Azhar M.; Kurtuluş, Dilek Funda; Goli, Srikanth; Alhems, Luai M. (2023-06-12) The control problem of VTOL UAV is studied in this paper. To manage the complexity of the control problem, the system dynamics are decomposed into two subsystems, i.e. translational dynamics and rotational or attitude dyna...
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...
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...
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...
Pre- and post-stall characteristics of a very light aircraft's wing for different design parameters Anılır, Berkan; Kurtuluş, Dilek Funda (2023-01-01) The impact of taper ratio, dihedral angle and wing tip shape on the aerodynamics of a very light aircraft’s wing has been investigated by performing URANS simulations at Reynolds number of 5 × 106 for pre- and post-stall c...
Insights from 3D modeling and fluid dynamics in COVID-19 pneumonia GÖKCAN, MUSTAFA KÜRŞAT; Kurtuluş, Dilek Funda; Aypak, Adalet; Köksal, Murathan; Ökten, Sarper R. (2023-01-01) We address the lack of research regarding aerodynamic events behind respiratory distress at COVID-19. The use of chest CT enables quantification of pneumonia extent; however, there is a paucity of data regarding the impact...
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...

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