Mechanical Engineering / Makina Mühendisliği

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

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  • Conference Object
    Tıbbi Uygulamalar için Özgün Yapılı Haptik Cihaz Tasarımı
    (Institute of Electrical and Electronics Engineers Inc., 2009) Selvi, Özgün; Bilgincan, Tunç; Kant, Yalkın; Dede, Mehmet İsmet Can
    Robotik sistemler hassasiyet gerektiren işlerde gün geçtilçe günlük hayatımızın bir parçası olmaya başladı. Bu işler genellikle herhangi bir operatör tarafından yapılamayacak kadar hassasiyet gerektiren işler olduğundan dolayı robotik teknolojiye ihtiyaç vardır. Bir robotik alanı olan Haptik teknolojisi, operatör ile çevrenin etkileşimini kuvvet geri beslemesi ile sağlayarak uygulamanın hassasiyet seviyesini arttırmaktadır. Bugünkü haliyle haptik teknoloji tıbbi operasyonlarda yardımcı sistem olarak ve birçok uzaktan kumandalı operasyonlarında (teleoperasyon) kullanılmaktadır. Aynı zamanda haptik teknoloji askeri ve tıbbi eğitim amaçlı sanal gerçeklik programlarında kullanılmaktadır. Bu çalışmanın amacı sistemin hassasiyetini arttırabilecek yapısal olarak yeni bir haptik cihaz tasarlamaktır. Bu kapsamda, önceden gerçekleştirilmiş robot tasarımları araştırıldı ve kavramsal tasarımlar gelistirildi. Sonuç olarak seçilen tasarım sanal ortam da oluşturuldu ve simülasyonu yapıldı, ve ilk prototipi imal edildi
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 6
    The Use of Chipless Sensors With Rfid for Condition Monitoring
    (Institute of Electrical and Electronics Engineers Inc., 2018) Biliç, H. Gökay; Büyüköztekin, Tarık; Özdemir, Serhan
    This paper presents the development phases and overview of developing research in the area of RFID condition monitoring, focusing on chipless sensors especially use in strain and temperature sensing applications. Classification of RFID sensors and smart material fundamentals are reviewed. The compact and feasible design of RFID sensors will be considered, as well as with the effect of different material usage. Finally, the use of chipless sensors with different condition monitoring applications and their challenges are investigated.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 3
    Green Smart Cities: Living Healthily With Every Breath
    (Institute of Electrical and Electronics Engineers Inc., 2019) Turhan, Cihan; Atalay, Ali Serdar; Gökçen Akkurt, Gülden
    Fifty-four percent of the world's population lives in big cities and it is projected to increase to nearly 70% by 2050s. Rapid and dense urbanization leads to smart cities which improve the quality of lives of the citizens. Therefore, development of smart cities is becoming vital. The quality of the citizens is affected by many factors including poor air quality, increased pollutants and microclimates called urban heat islands. The URBAN GreenUP project, initiated in June 2017, is a project funded under the European Union's Horizon 2020 programme. The main objective of the project is the development, application and replication of re-naturing Urban Plans in a number of European cities. In this study, measurement of nature-based solutions for mitigation of urban heat island effect and improvement of air quality for Urban GreenUP project in Izmir, will be introduced.
  • Conference Object
    Citation - WoS: 1
    Citation - Scopus: 3
    Reconfigurable deployable umbrella canopies
    (Institute of Electrical and Electronics Engineers Inc., 2018) Jovichikj, R.; Yaşır, Abdullah; Kiper, Gökhan
    The kinematic design of reconfigurable deployable canopy mechanisms with radially distributed limbs are presented in this study. The mechanisms allow a compact form and are reconfigurable with several alternative deployed forms which can be in the form of a tent, a canopy or a form in between. Each limb of the canopy possesses at least two assembly modes which enables reconfigurability. The conditions for deployment and reconfiguration of the mechanism are derived. These conditions impose equality and inequality constraints for the link lengths of the mechanism. A parametric model of the mechanism is constructed in Excel for design and simulation purposes. Solid models and a prototype are presented as examples.
  • Conference Object
    Citation - WoS: 2
    Citation - Scopus: 4
    An Innovative Cleaning Tool for Underwater Soft Cleaning Operations
    (Institute of Electrical and Electronics Engineers Inc., 2015) Gündoğdu, Hilal Tolasa; Dede, Mehmet İsmet Can; Taner, Barış; Ridolfi, Alessandro; Costanzi, Riccardo; Allotta, Benedetto
    This work takes place in the framework of the EU FP7 funded ARROWS project. In ARROWS project, low-cost autonomous underwater vehicle technologies are adapted and developed to significantly reduce the costs of underwater archaeological operations, covering the full extent of archaeological campaign. The project aims to deal with underwater mapping, diagnosis and cleaning tasks. This paper, specifically, describes the development of a cleaning tool (CT) to be used in cleaning underwater archaeological sites. This cleaning tool will be exploited not only during research missions, but also for the periodic monitoring, controlling and maintenance activity of well-known underwater archaeological sites (e.g. periodic cleaning operations). In this paper, the design criteria, working principles, the design and the performance tests of the developed CT are explained in details. The performance results are discussed in the final section.
  • Conference Object
    Mixed Convection Heat Transfer in a Partially Heated Parallel Plate Vertical Channel
    (Institute of Electrical and Electronics Engineers Inc., 2014) Çelik, Hasan; Mobedi, Moghtada
    Laminar mixed convection heat transfer in a two dimensional symmetrically and partially heated vertical channel is investigated. The heated portions exist on the both walls of channel and their temperature is constant. The number of the heated portions is changed from 2 to 4 for each wall; however the total length of the heated portions is fixed. The fluid inlet velocity is uniform and air is taken as working fluid. The continuity, momentum and energy equations are solved numerically by using finite volume method. Results are compared with available studies in literature and good agreement is observed. The velocity and temperature fields are obtained for Gr / Re2= 0.0033 and 13.33. Based on the obtained temperature distributions, the change of local Nusselt number for different number of heated portions are obtained and plotted. The variation of the mean Nusselt number with the number of heated portions is also discussed. © 2014 IEEE.
  • Conference Object
    Citation - WoS: 4
    Citation - Scopus: 7
    General subtask controller for redundant robot manipulators
    (Institute of Electrical and Electronics Engineers Inc., 2012) Maaroof, Omar W.; Gezgin, Erkin; Dede, Mehmet İsmet Can
    This paper will utilize the property of self-motion for redundant robot manipulators by designing the general subtask controller that control the joint motion in the null-space of the Jacobian matrix. The general subtask controller is used for minimizing the total joint motion and for singularity avoidance in this study. Specifically, objective function for each subtask is formed and then the gradient of the objective function is used in the subtask controller to either minimize the joint motion or avoid singularities while tracking a given end-effector trajectory. A 7-DOF LWA4-Arm (SCHUNK) is modeled first in SolidWorks® and then converted to MATLAB® Simulink using SimMechanics CAD translator for the simulation tests of the controller. The kinematics and dynamics equations are derived to be used in the controllers and the simulation results are presented for the 7-DOF redundant robot manipulator operating in 3D space. © 2012 ICROS.
  • Conference Object
    Citation - WoS: 5
    Citation - Scopus: 6
    Multiobjective Genetic Algorithm Optimization of the Composite Laminates as a Satellite Structure Material for Coefficient of Thermal Expansion and Elastic Modulus
    (Institute of Electrical and Electronics Engineers Inc., 2009) Aydın, Levent; Artem, Hatice Seçil
    This study considers multi-objective optimal design of the fiber reinforced symmetric-balanced laminated composites using genetic algorithms. MATLAB Genetic Algorithm and Direct Search Toolbox is used to obtain Pareto-optimal design for three different model problems. The objectives of the problems are to maximize the Young's moduli and minimize the coefficient of thermal expansion (CTE) simultaneously for 8 and 16 layered carbon/epoxy composites. Simplified micromechanics equations and classical lamination theory are used in order to obtain the fitness functions of the problems. Stress and strain distributions are presented through the thickness of the laminates for the optimized problems under mechanical and thermal loadings.
  • Conference Object
    Citation - WoS: 9
    Citation - Scopus: 13
    Design of a Haptic Device for Teleoperation and Virtual Reality Systems
    (Institute of Electrical and Electronics Engineers Inc., 2009) Dede, Mehmet İsmet Can; Selvi, Özgün; Bilgincan, Tunç; Kant, Yalkın
    Haptics technology has increased the precision and telepresence of the teleoperation and precision of the in-house robotic applications by force and surface information feedback. Force feedback is achieved through sending back the pressure and force information via a haptic device as the information is created or measured at the point of interest. In order to configure such a system, design, analysis and production processes of a haptic device, which is suitable for that specific application, becomes important. Today, haptic devices find use in assistive surgical robotics and most of the teleoperation systems. These devices are also extensively utilized in simulators to train medical and military personnel. The objective of this work is to design a haptic device with a new structure that has the potential to increase the precision of the robotic operation. Thus, literature is reviewed and possible robot manipulator designs are investigated to increase the precision in haptics applications. As a result of the investigations, conceptual designs are developed. Ultimately, final design is selected and produced after it is investigated in computer-aided- design (CAD) environment and its kinematic and structural analyses are carried out.
  • Conference Object
    Control of Teleoperation Systems Operating Under Communication Line Failures
    (Institute of Electrical and Electronics Engineers Inc., 2008) Dede, Mehmet İsmet Can; Tosunoğlu, Sabri
    Abstract While the robots gradually become a part of our daily lives, they already play vital roles in many critical operations. Some of these critical tasks include surgeries, battlefield operations, and tasks that take place in hazardous environments or distant locations such as space missions. In most of these tasks, remotely controlled robots are used instead of autonomous robots. This special area of robotics is called teleoperation. Teleoperation systems must be reliable when used in critical tasks; hence, all of the subsystems must be dependable even under a subsystem or communication line failure. Teleoperation controllers are designed to compensate for instabilities due to communication time delays. Modifications to the existing controllers are proposed to configure a controller that is reliable under communication line failures. Experimental studies are then conducted on limited-and unlimited-workspace teleoperation systems to verify the efficiency of the controllers proposed for each system.