Şahin, Osman Nuri

Profile Picture
Profile URL
https://hdl.handle.net/20.500.14365/6715
Name Variants
Sahin, Osman Nuri
Job Title
Email Address
osman.sahin@ieu.edu.tr
Main Affiliation
05.01. Aerospace Engineering
Status
Current Staff
Website
ORCID ID
0000-0003-1904-4495
Scopus Author ID
57193167715
Turkish CoHE Profile ID
995E81851E907302
Google Scholar ID
WoS Researcher ID
JGL-8771-2023
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Osman_Nuri_Sahin.jpg (7.58 KB)

Sustainable Development Goals

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8

Citations

22

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3

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Documents

4

Citations

19

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Scholarly Output

5

Articles

1

Views / Downloads

3/0

Supervised MSc Theses

0

Supervised PhD Theses

0

WoS Citation Count

2

Scopus Citation Count

3

WoS h-index

1

Scopus h-index

1

Patents

0

Projects

0

WoS Citations per Publication

0.40

Scopus Citations per Publication

0.60

Open Access Source

0

Supervised Theses

0

JournalCount
2024 11th International Conference on Electrical and Electronics Engineering, ICEEE 2024 -- 11th International Conference on Electrical and Electronics Engineering, ICEEE 2024 -- 22 April 2024 through 24 April 2024 -- Marmaris -- 2050323
7th International Congress on Human-Computer Interaction, Optimization and Robotic Applications-ICHORA -- MAY 23-24, 2025 -- Ankara, TURKIYE1
Industrıal Robot-The Internatıonal Journal of Robotıcs Research And Applıcatıon1
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Now showing 1 - 5 of 5
  • Thumbnail Image
    Conference Object
    Development of a Split Ring Resonator Sensor for Vibration Detection
    (Institute of Electrical and Electronics Engineers Inc., 2024) Zengin, E.B.; Fawzy, D.E.; Allam, A.M.M.A.; Şahin, O.N.
    The main focus of this work is the development of a metamaterial-based vibration sensor for the detection of earthquake amplitudes. The sensor is composed of two metamaterial layers made of FR-4 substrates with Circular Split Ring Resonators (CSRR) arranged in a back-to-back configuration on each substrate. The variation of the spacing between the plates results in an alteration of the electric field and thus changes in the resonance frequencies of the whole system. The system is designed and optimized to resonate in the GSM 1.8 GHz band, which ultimately results in a self-sustaining sensor. A clear relationship between the spacing of the two layers and the shift in the resonance frequency has been obtained. It also changes the magnitude of the reflected and absorbed energy from the sensor. This spacing in turn can be directly correlated with the vibration amplitudes. The system can be integrated into a warning system with the ability to quantify the structural resilience of buildings against potentially damaging vibrations. Different unit cell geometries of metamaterial surface are tested before selecting the CSRR geometry to develop highly sensitive sensors operating in the GSM frequency band at 1.8 GHz. © 2024 IEEE.
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    Conference Object
    Design and Implementation of an Antenna for Automotive Applications at 76.5 Ghz
    (Institute of Electrical and Electronics Engineers Inc., 2024) Mohamed, M.S.A.; Esam, G.; Allam, A.M.M.A.; Alexan, W.; Gadelmavla, Diaa; Şahin, Osman Nuri
    This paper presents an antenna candidate for automotive cars and MIMO radar applications. It is implemented on Rogers RO4003C with a relative dielectric constant of 3.55 and a thickness of 0.203 mm. Linearly and circularly polarized versions of printed antennas are presented and operate at 76.5 GHz, which meets the characteristics of the required application. One of the antennas is selected and fabricated for validation. The results of the reflection coefficient fo und good agreement between the simulated and measured ones. Further antenna parameters like 3D and 2D radiation patterns, realized gain and axial ratio are illustrated. © 2024 IEEE.
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    Article
    Citation - WoS: 2
    Citation - Scopus: 3
    Model-Based Detection and Isolation of the Wheel Slippage and Actuator Faults of a Holonomic Mobile Robot
    (Emerald Group Publishing Ltd, 2022) Sahin, Osman Nuri; Dede, Mehmet Ismet Can
    Purpose Mobile robots may perform very critical tasks under difficult operating conditions. Faults encountered during their tasks may cause the task to be interrupted or failed completely. In the active fault tolerant control methods, it is very important not only to detect the faults that occur in the robot, but also to isolate these faults to develop a fault recovery strategy that is suitable for that specific type of fault. This study aims to develop a model-based fault detection and isolation method for wheel slippage and motor performance degradation that may occur in wheeled mobile robots. Design/methodology/approach In the proposed method, wheel speeds can be estimated via the dynamic model of the mobile robot, which includes a friction model between the wheel and the ground. Four residual signals are obtained from the differences between the estimated states and the measured states of the mobile robot. Mobile robot's faults are detected by using these signals. Also, two different residual signals are generated from the calculation of the traction forces with two different procedures. These six residual signals are then used to isolate possible wheel slippage and performance degradation in a motor. Findings The proposed method for diagnosing wheel slip and performance degradation in motors are tested by moving the robot in various directions. According to the data obtained from the test results, a logic table is created to isolate these two faults from each other. Thanks to the created logic table, slippage in any wheel and performance degradation in any motor can be detected and isolated. Originality/value Two different recovery strategies are needed to recover temporary wheel slippage and permanent motor faults. Therefore, it is important to isolate these two faults that create similar symptoms in robot's general movement. Thanks to the method proposed in this study, it is not only possible to isolate the slipping wheel with respect to the non-slipping wheels or to isolate the faulty motor from the non-faulty ones, but also to isolate these two different fault types from each other.
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    Conference Object
    Analysing the Friction Effect on Velocity Control of a DC Motor for Gimbal Applications
    (IEEE, 2025) Altunay, Ferhat; Ertugrul, Seniz; Sahin, Osman Nuri
    Stabilizing a platform is vital for many industries, such as defense and photography. Gimbals are systems that stabilize a platform. An accurate motor speed control is very important for gimbals. In this research, a DC motor model is developed and combined with a precise friction model, including the Stribeck effect, viscous friction, static friction, and Coulomb friction terms. The impact of each different friction term is demonstrated. Also, the total effect of friction terms on a speed-controlled DC motor is analysed. Finally, a model-based friction compensator is used to minimize the effect of linear friction terms. According to the results, a proper friction model should be used for gimbal DC motors.
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    Conference Object
    Developement of 4-Ports Mimo Cp Antennas for Radar Applications
    (Institute of Electrical and Electronics Engineers Inc., 2024) Said, A.; Allam, A.M.M.A.; Fawzy, D.E.; Sahin, O.N.
    This paper introduces a printed four-port MIMO antenna with advantages such as compact size, excellent MIMO diversity performance, and simple geometry for radar applications at 10 GHz. It is small size makes it suitable for integrating various telecommunication devices for multiple applications, with a prototype measuring 32 mm × 32 mm × 4.3 mm. The mutual coupling between the individual elements significantly im-pacts the MIMO system's diversity properties, and an effective technique of orthogonally positioning the antenna elements to each other increases their isolation resulting in superior MIMO diversity performance. It is evaluated through S-parameters and MIMO diversity parameters to ensure its suitability for future radar applications. It is validated through measurements, and the results showed a good match between simulated and measured results. The different diversity parameters such as (Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Channel Capacity Loss (CCL), Multiplexing Efficiency (ME), Total Active Reflection Coefficient (TARC) are simulated and measured. It is found that all values are within the standard norms which indicates the availability for MIMO radar applications. © 2024 IEEE.