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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Recent Submissions

Now showing 1 - 4 of 4
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    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, Yonas
    In 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.
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    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, Yonas
    This 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.
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    Artificial Heart for Humanoid Robot
    Potnuru, Akshay; Wu, Lianjun; Tadesse, Yonas; BarCohen, Y.
    A soft robotic device inspired by the pumping action of a biological heart is presented in this study. Developing artificial heart to a humanoid robot enables us to make a better biomedical device for ultimate use in humans. As technology continues to become more advanced, the methods in which we implement high performance and biomimetic artificial organs is getting nearer each day. In this paper, we present the design and development of a soft artificial heart that can be used in a humanoid robot and simulate the functions of a human heart using shape memory alloy technology. The robotic heart is designed to pump a blood-like fluid to parts of the robot such as the face to simulate someone blushing or when someone is angry by the use of elastomeric substrates and certain features for the transport of fluids.
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    The Mechanical Design of a Humanoid Robot with Flexible Skin Sensor for use in Psychiatric Therapy
    Burns, Alec; Tadesse, Yonas; BarCohen, Y.
    In this paper, a humanoid robot is presented for ultimate use in the rehabilitation of children with mental disorders, such as autism. Creating affordable and efficient humanoids could assist the therapy in psychiatric disability by offering multimodal communication between the humanoid and humans. Yet, the humanoid development needs a seamless integration of artificial muscles, sensors, controllers and structures. We have designed a human-like robot that has 15 DOF, 580 mm tall and 925 mm arm span using a rapid prototyping system. The robot has a human-like appearance and movement. Flexible sensors around the arm and hands for safe human-robot interactions, and a two-wheel mobile platform for maneuverability are incorporated in the design. The robot has facial features for illustrating human-friendly behavior. The mechanical design of the robot and the characterization of the flexible sensors are presented. Comprehensive study on the upper body design, mobile base, actuators selection, electronics, and performance evaluation are included in this paper.

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