Mechanical Engineering / Makina Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/4129

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COAR Access Rights: search.filters.coarAccessRights.open accessInstitution Author: search.filters.institutionAuthor.Demirel, Murat

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Now showing 1 - 4 of 4
  • Article
    Citation - WoS: 5
    Citation - Scopus: 4
    Design of a Novel Hybrid Cable-Constrained Parallel Leg Mechanism for Biped Walking Machines
    (Cambridge University Press, 2023) Demirel, M.; Kiper, G.; Carbone, G.; Ceccarelli, M.
    In this paper, a novel cable-constrained parallel mechanism is presented as a lightweight, low-cost leg mechanism design for walking machines to be used on flat surfaces. The proposed leg mechanism has three translational degrees of freedom. It is based on two specific hybrid kinematic topologies being herewith proposed. The paper reports the kinematic analysis formulation and a position performance evaluation to confirm the main characteristics of the proposed solutions. A 3D CAD model and simulations are carried out to demonstrate the feasibility of the proposed design for performing a human-like gait trajectory. A prototype has been built, and preliminarily tests have been conducted to confirm the motion capabilities of the proposed mechanism design. Then a second, enhanced prototype has been designed and built. An experimental validation is carried out for tracking a planar walking trajectory with the built prototypes by using a real-time PCI controller. Results are presented to validate the operation characteristics of the proposed mechanism and to prove its feasibility for legged walking machines. © The Author(s), 2023.
  • Conference Object
    Katlanabilir Mafsallı Kafes Direklerin Katlanma Oranlarını Etkileyen Faktörlerin İncelenmesi ve Yeni Bir Tasarım Yönteminin Araştırılması
    (Makina Teorisi Derneği, 2021) Cebeci, Yunus; Demirel, Murat; Kiper, Gökhan
    Bu çalışmanın temel amacı uzay uygulamalarında kullanılan katlanabilir mafsallı kafes direklerin katlanma oranına etki eden parametrelerini incelemek ve katlanma oranını artırıcı iyileştirmeler üzerine araştırmalar yapmaktır. Çalışma kapsamında katlanabilir mafsallı kafes direkleri oluşturan yapılar incelenmiş ve tasarımda kritik rol oynayan uzunluklar belirlenerek ve uzuvlar üzerinde iyileştirme yöntemleri önerilerek katlanma oranının artırılması hedeflenmiştir. Önerilen yöntem ile ön çalışmalar yapılarak literatürdeki benzer katlanabilir direklere kıyasla daha fazla katlanma oranının elde edildiği gösterilmiştir.
  • Conference Object
    Internship Experience for Learning the Operation of a Cable-Driven Robot for Rehabilitation Tasks
    (Springer, 2019) Carbone, G.; Cafolla, D.; Ceccarelli, M.; Aydınoğlu, Öndercan; Demirel, Murat
    This paper describes an example of internship experience at LARM, Laboratory of Robotics and Mechatronics, at University of Cassino and South Latium. In particular, the main focus of this paper is the learning process as basis of a proper internship. Namely, a specific experiential learning approach is proposed as referring to a low-cost servo motor operation task. The learning task is further defined and developed as referring to a real application with a cable-driven robot for rehabilitation tasks, which has been designed and built at LARM in Cassino and under further investigation within Agewell project.
  • Conference Object
    Citation - Scopus: 3
    Design and Simulation of a Novel Hybrid Leg Mechanism for Walking Machines
    (Springer Verlag, 2018) Demirel, Murat; Carbone, Giuseppe; Ceccarelli, Marco; Kiper, Gökhan
    This paper introduces a novel hybrid structure design that is composed of rigid links and cables for a robotic leg with static walking. The proposed mechanism is characterized by actuated hip joints, passive knee joints and an actuated prismatic foot joint. The foot is the moving platform of the proposed mechanism which possesses pure translational motion due to the passive parallelograms with cables. Kinematic analysis has been worked out for evaluating a typical human-like gait trajectory. A 3-D model has been developed and simulation are made in SolidWorks® environment. Simulation results show that the proposed mechanism is able to perform an ovoid walking cycle of a foot point and the computed actuator torques and forces are in a feasible range for a low-cost and easy-operation design. The simulation results will be used for a prototype construction in a future work.