Person: Yavuz, Samet
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Yavuz
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Samet
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Samet YAVUZ
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Publication Design and Optimization of a Walking Over-Constrained Mechanism(Springer International Publishing, 2019) Özgün Selvi; Marco Ceccarelli; Samet Yavuz; Yavuz, SametIn this paper, a walking overconstrained mechanism with one DoF is presented. Firstly, its dimensional parameters and geometry are shown and a step profile which is wanted to be followed by end point of the walking mechanism is proposed. Kinematic equations of the walking mechanism are extracted to use them later as constraints for Firefly Algorithm. Algorithm is run in get the optimized dimensional parameters to provide the desired step profile. Results are presented.Publication Development of a Restraint System for Rear-Facing Car Seats(Machines, 2023-01-01) Himmetoğlu, Selçuk; Yavuz, SametIn self-driving vehicles, passengers can set their seats in an unconventional seating position, such as rear-facing. Sitting in such an orientation can increase the risk of whiplash in the head-and-neck system in a frontal impact, as frontal crashes usually have higher severities compared with rear-end crashes. This paper shows that a forward-facing front seat optimised for rear-impact protection needs to be redesigned to be used as a rear-facing seat. In the second and main part of this paper, a restraint system for rear-facing car seats is developed, and frontal impact simulations with 64 km/h of delta-V are used to evaluate its performance. The designed seating system comprises two rigid torso plates, a fixed recliner and an energy absorber under the seat pan. Without using the developed restraint system, the 50th percentile male human model is exposed to neck shear forces exceeding 600 N. With the developed restraint system, neck shear forces are less than 350 N in frontal impacts with 64 km/h of delta-V. Apart from whiplash, the risk of head, chest, lower extremity and lower back injuries are also evaluated. The results confirm that the developed restraint system successfully protects the occupant since all assessment criteria values are lower than the injury assessment reference values.Publication A Simple Way for Estimating Mechanical Properties from Stress-Strain Diagram using MATLAB and Mathematica(IEEE, 2019-10) Yılmaz, Emre; Yavuz, SametIn this paper, mechanical properties of materials, e.g. ultimate tensile strength, yield stress, elastic modulus, ductility, resilience, toughness, etc., are calculated using MATLAB and Mathematica programming language and stress-strain data of any alloy.Publication Hareket Kısıtlayıcı Bir Araç Koltuğu Mekanizmasının Dinamik Analizi(European Journal of Science and Technology, 2022-01-01) Samet YAVUZ; Yavuz, SametBu çalışma kapsamında tek serbestlik derecesine sahip ön gerinimli bir yayın serbest bırakılmasıyla hareketlendirilen bir mekanizmanın dinamik analizi gerçekleştirilmiştir. Yayın serbest bırakılmasıyla birlikte çalışmaya başlayan mekanizma sürücü koltuğunu daha dik bir konuma getirerek çarpışma öncesinde hareket kısıtı sağlayacaktır. Mekanizmanın dinamik analizi Newton-Euler metoduyla gerçekleştirilmiş olup diferansiyel denklemi MATLAB yazılımıyla çözülmüştür. Elde edilen hareket denklemi zamana bağlı grafiğe aktarılarak mekanizmanın performansı gösterilmiştir.Publication Dimensional optimisation of a 3-DoF spherical parallel manipulator for rehabilitation by using firefly algorithm(Inderscience Publishers, 2018) Özgün Selvi; Samet Yavuz; Yavuz, SametThis study deals with the dimensional optimisation problem of a 3-DoF 3-legged spherical parallel robot with a desired workspace, which was planned to be used as a rehabilitation robot for human wrist. The movement of the end-effector will provide all degrees of freedom (DoFs) of human wrist joint. Each leg of manipulator has two spherical links and all joint axes on these links are intersecting on a common point. Inverse kinematics equations are solved and Jacobian matrices are obtained for this mechanism to obtain an objective function for optimisation algorithm. Later, the architectural optimisation with desired workspace are made by using Firefly Algorithms. Finally, a simulation was done to test the obtained dimensional parameters in desired workspace.Publication Design and Dimensional Optimization of a Novel Walking Mechanism with Firefly Algorithm(Springer International Publishing, 2017-06-10) Özgün Selvi; Samet Yavuz; Yavuz, SametIn this paper, a walking mechanism named Atlas is proposed which is a Watt-I type 6 link mechanism. First, the geometry is proposed and then kinematic analysis is done that will be used for the synthesis problem. Furthermore, constraints and an objective function are obtained from kinematic analysis. Then, these constraints are implemented to the Firefly Algorithm and dimensional parameters are obtained for a desired step profile. Finally, these dimensional parameters are tested.Publication One Dof Thumb Mechanism and It's Dimensional Optimization(International Journal of Multidisciplinary Studies and Innovative Technologies, 2019-01-01) Yavuz, SametThis paper involves the geometrical representation, kinematic solution and dimensional optimization of a one degree of freedom parallel thumb mechanism. The aim of the designing of this mechanism grasping objects by mimicking of a human thumb. Link length optimization of the mechanism are made around an average human thumb sizes by using Firefly Algorithm which is a nature inspired optimization algorithm.