Tadesse, Yonas
Permanent URI for this collectionhttps://hdl.handle.net/10735.1/4253
Yonas Tadesse is an Assistant Professor of Mechanical Engineering. His research interests include:
- Humanoid robotics
- Emerging applications of smart materials, sensors and actuators
- Systems and mechatronics
- Multimodal energy harvesting, modeling, controls and biomimetics
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Browsing Tadesse, Yonas by Subject "Robotics"
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Item Fabrication of Polylactide/Carbon Nanopowder Filament Using Melt Extrusion and Filament Characterization for 3D Printing(World Scientific Publishing Co. Ltd) Jain, Shrenik Kumar; Tadesse, Yonas; Jain, Shrenik Kumar; Tadesse, YonasIn this study, less expensive mesoporous nano carbon (NC) infused in polylactide (PLA) thermoplastic filaments were fabricated to improve the electrical properties and maintaining sufficient strength for 3D printing. Solution blending was used for PLA-NC nanocomposite fabrication and melt extrusion was employed to make cylindrical filaments. Mechanical and electrical properties of 1-20wt.% of NC-filaments were investigated and significant improvement of conductivity (3.76S/m) and sufficient yield strength (35MPa) were obtained. SEM images exhibited uniform dispersion of NC in polymer matrix and DSC results showed no significant changes in the glass transition temperature (Tg) for all the compositions. Perspective uses of this filament are for fabrication of electrical wires in 3D printed robots, drones, prosthetics, orthotics and others.Item Nylon-Muscle-Actuated Robotic Finger(SPIE--International Society of Optical Engineering) Wu, Lianjun; de Andrade, Monica Jung; Rome, Richard S.; Haines, Carter; Lima, Marcio D.; Baughman, Ray H.; Tadesse, Yonas; Wu, Lianjun; de Andrade, Monica Jung; Rome, Richard S.; Haines, Carter; Lima, Marcio D.; Baughman, Ray H.; Tadesse, YonasThis paper describes the design and experimental analysis of novel artificial muscles, made of twisted and coiled nylon fibers, for powering a biomimetic robotic hand. The design is based on circulating hot and cold water to actuate the artificial muscles and obtain fast finger movements. The actuation system consists of a spring and a coiled muscle within a compliant silicone tube. The silicone tube provides a watertight, expansible compartment within which the coiled muscle contracts when heated and expands when cooled. The fabrication and characterization of the actuating system are discussed in detail. The performance of the coiled muscle fiber in embedded conditions and the related characteristics of the actuated robotic finger are described.