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Hyouk Ryeol Choi - One of the best experts on this subject based on the ideXlab platform.

  • Development of Wall Climbing Robot System by Using Impeller Type Adhesion Mechanism
    Journal of Intelligent and Robotic Systems, 2013
    Co-Authors: Ig Mo Koo, Tran Duc Trong, Hyungpil Moon, Ja Choon Koo, Yoon Lee, Sun-kyu Park, Hyouk Ryeol Choi
    Abstract:

    In this paper, we present a wall climbing robot system, called "LARVA", developed for visual inspection of structures with flat surfaces. The robot has two differential driving wheels with a suspension and an Adhesion Mechanism. The Adhesion Mechanism is composed of an impeller and two---layered suction seals. It is designed to provide sufficient Adhesion force and be controlled so that the robot can move freely on various wall surfaces. The static and aerodynamic modeling of the Adhesion Mechanism is given and the analysis of the Adhesion Mechanism, air leakage, and inner flow are carried out to be useful for the design as well as the control. Finally, the performances of the robot are experimentally verified on several kinds of walls and its feasibility is validated.

  • development of cable climbing robot for maintenance of suspension bridges
    Conference on Automation Science and Engineering, 2012
    Co-Authors: Ho Moo Kim, Kyeong Ho Cho, Fengyi Liu, Ja Choo Koo, Hyouk Ryeol Choi
    Abstract:

    In this paper, we introduce a wheel-based cable climbing robot system developed for maintenance of the suspension bridges. The robot consists of three parts: a wheel based driving Mechanism, Adhesion Mechanism, and safe landing Mechanism. The driving Mechanism is a combination of pantograph Mechanism, and wheels driven by motors. In addition, we propose a special design of safe landing Mechanism which can assure the safety of the robot on the cables when the power is lost. Finally, the proposed robotic system is manufactured and validated in the indoor experimental environments.

  • development of cable climbing robotic system for inspection of suspension bridge
    28th International Symposium on Automation and Robotics in Construction, 2011
    Co-Authors: Ho Moon Kim, Kyeong Ho Cho, Fengyi Liu, Hyouk Ryeol Choi
    Abstract:

    In this paper, we propose a wheel-based cable climbing robotic system which can climb up and down the vertical cylindrical cables in the suspension bridges. Firstly, we develop climbing Mechanism which includes wheels driven by motors and Adhesion system.In addition,we propose a special design of Adhesion Mechanism which can maintain Adhesion force even when the power is lost.Finally, an additional Mechanism is developed for guaranteeing the safety of the robot during operations on cables.

Ye G. - One of the best experts on this subject based on the ideXlab platform.

  • Molecular dynamics and experimental study on the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash
    'Elsevier BV', 2021
    Co-Authors: Zhang S., Duque-redondo Eduardo, Kostiuchenko A., Sanchez Dolado J., Ye G.
    Abstract:

    This paper aims to study the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber within alkali-activated slag/fly ash (AASF) matrix using molecular dynamics (MD) simulation in combination with systematic experimental characterization. The Adhesion of PVA to C-(N-)A-S-H gel with different Ca/(Si+Al) and Al/Si ratios was modeled using MD simulation, with the related adsorption enthalpy calculated and the Adhesion Mechanism explored. The experimentally attained chemical bonding energy of PVA fiber in AASF coincides well with the simulation results. In both cases, the Adhesion enhances primarily with increasing Ca/(Si+Al) ratio of C-(N-)A-S-H gel. Additionally, MD simulation indicates preferential element distributions of Ca around PVA molecule, which was confirmed experimentally by the detection of the Ca-rich C-(N-)A-S-H gel in the interfacial transition zone (ITZ). This study provides further insights into the Adhesion Mechanism of PVA fiber to C-(N-)A-S-H gel formed in AASF, which is particularly valuable for the future development of PVA-based high-performance alkali-activated composites.Materials and Environmen

  • Molecular dynamics and experimental study on the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash
    'Elsevier BV', 2021
    Co-Authors: Zhang S., Duque-redondo Eduardo, Kostiuchenko A., Sanchez Dolado J., Ye G.
    Abstract:

    This paper aims to study the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber within alkali-activated slag/fly ash (AASF) matrix using molecular dynamics (MD) simulation in combination with systematic experimental characterization. The Adhesion of PVA to C-(N-)A-S-H gel with different Ca/(Si+Al) and Al/Si ratios was modeled using MD simulation, with the related adsorption enthalpy calculated and the Adhesion Mechanism explored. The experimentally attained chemical bonding energy of PVA fiber in AASF coincides well with the simulation results. In both cases, the Adhesion enhances primarily with increasing Ca/(Si+Al) ratio of C-(N-)A-S-H gel. Additionally, MD simulation indicates preferential element distributions of Ca around PVA molecule, which was confirmed experimentally by the detection of the Ca-rich C-(N-)A-S-H gel in the interfacial transition zone (ITZ). This study provides further insights into the Adhesion Mechanism of PVA fiber to C-(N-)A-S-H gel formed in AASF, which is particularly valuable for the future development of PVA-based high-performance alkali-activated composites.

Zhang S. - One of the best experts on this subject based on the ideXlab platform.

  • Molecular dynamics and experimental study on the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash
    'Elsevier BV', 2021
    Co-Authors: Zhang S., Duque-redondo Eduardo, Kostiuchenko A., Sanchez Dolado J., Ye G.
    Abstract:

    This paper aims to study the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber within alkali-activated slag/fly ash (AASF) matrix using molecular dynamics (MD) simulation in combination with systematic experimental characterization. The Adhesion of PVA to C-(N-)A-S-H gel with different Ca/(Si+Al) and Al/Si ratios was modeled using MD simulation, with the related adsorption enthalpy calculated and the Adhesion Mechanism explored. The experimentally attained chemical bonding energy of PVA fiber in AASF coincides well with the simulation results. In both cases, the Adhesion enhances primarily with increasing Ca/(Si+Al) ratio of C-(N-)A-S-H gel. Additionally, MD simulation indicates preferential element distributions of Ca around PVA molecule, which was confirmed experimentally by the detection of the Ca-rich C-(N-)A-S-H gel in the interfacial transition zone (ITZ). This study provides further insights into the Adhesion Mechanism of PVA fiber to C-(N-)A-S-H gel formed in AASF, which is particularly valuable for the future development of PVA-based high-performance alkali-activated composites.Materials and Environmen

  • Molecular dynamics and experimental study on the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber in alkali-activated slag/fly ash
    'Elsevier BV', 2021
    Co-Authors: Zhang S., Duque-redondo Eduardo, Kostiuchenko A., Sanchez Dolado J., Ye G.
    Abstract:

    This paper aims to study the Adhesion Mechanism of polyvinyl alcohol (PVA) fiber within alkali-activated slag/fly ash (AASF) matrix using molecular dynamics (MD) simulation in combination with systematic experimental characterization. The Adhesion of PVA to C-(N-)A-S-H gel with different Ca/(Si+Al) and Al/Si ratios was modeled using MD simulation, with the related adsorption enthalpy calculated and the Adhesion Mechanism explored. The experimentally attained chemical bonding energy of PVA fiber in AASF coincides well with the simulation results. In both cases, the Adhesion enhances primarily with increasing Ca/(Si+Al) ratio of C-(N-)A-S-H gel. Additionally, MD simulation indicates preferential element distributions of Ca around PVA molecule, which was confirmed experimentally by the detection of the Ca-rich C-(N-)A-S-H gel in the interfacial transition zone (ITZ). This study provides further insights into the Adhesion Mechanism of PVA fiber to C-(N-)A-S-H gel formed in AASF, which is particularly valuable for the future development of PVA-based high-performance alkali-activated composites.

Hohyun Lee - One of the best experts on this subject based on the ideXlab platform.

  • The interfacial restructuring to amorphous: A new Adhesion Mechanism of cold-sprayed coatings
    Materials Letters, 2016
    Co-Authors: K.h. Ko, J. O. Choi, Hohyun Lee
    Abstract:

    A new plausible Adhesion Mechanism of cold-sprayed coatings on hard, non-deformable substrates was proposed. Interface analysis of both the heavy (Cu) and light (Al) metal coatings on the ceramic substrates such as AlN and ZrO2 showed that the amorphous cascade volume fractions were created on impact. Furthermore, these amorphous volume fractions provided the channels for quick and effective atomic level intermixing to yield high bond strength in the cold spray process. The important parameters to determine the total amorphous cascade volume were relative hardness, mechanical deformability and density of colliding particles. Therefore, the final bonding strength would be predicted based on the fit between these parameters for coating and substrate materials.

Harry H. Asada - One of the best experts on this subject based on the ideXlab platform.

  • Development of a Wheeled Wall-Climbing Robot with a Shape-Adaptive Magnetic Adhesion Mechanism
    2020 IEEE International Conference on Robotics and Automation (ICRA), 2020
    Co-Authors: Haruhiko Eto, Harry H. Asada
    Abstract:

    This paper presents a wheeled wall-climbing robot with a shape-adaptive magnetic Adhesion Mechanism for large steel structures. To travel up and down various curved ferromagnetic surfaces, we developed a 2 DOF rotational magnetic Adhesion Mechanism installed on each wheel that can change the orientation of the magnets to keep the magnetic force direction always normal to the contact surface. These magnetic wheels have a spherical shape and can move relative to the main body by a non-elastic suspension Mechanism so that the robot can climb up small obstacles on the ground and find contact points for each wheel on a wall with an arbitrary curved shape. Being geometrically stable is important for the robot because this robot is intended to be a mobile base for a welding manipulator. The detailed design of the Mechanism and the results of climbing tests are presented.