JFPS International Journal of Fluid Power System
Online ISSN : 1881-5286
ISSN-L : 1881-5286
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  • Toshihiro YOSHIMITSU, Kousuke OHSHITA, Chihiro HAGIWARA, Osamu OYAMA
    2019 Volume 12 Issue 1 Pages 1-9
    Published: 2019
    Released: December 10, 2019

     Personal care robots are expected to be valuable labor force in Japan that is entering an aging society. When using the personal care robot in the same space as humans, there are many safety issues. Personal care robots are actively researched, and flexible pneumatic actuators are used there. Collecting environmental information is necessary for robots and humans to coexist safely. Research on the tactile field of the robot does not reproduce the human skin sensation and the like but utilizes data obtained from contact sensors and the like as a physical quantity different from human skin sensation. However, there are many problems that have not yet been elucidated for the mechanism of human material recognition. Tactile sensation is a sense that it is possible to detect the hardness, surface roughness, temperature of an object for the first time by touching and moving an object unlike vision and hearing, and it is a sensation that it is important to actively move a finger.

    In this study, artificial fingers with joints for detecting the surface condition, hardness and temperature are fabricated using a strain gauge and a thermocouple, and by introducing active tactile perception using a pneumatic actuator, Develop pneumatic artificial fingers with near tactile sensory function. To make the texture factor equivalent to that obtained from humans by these, a material recognition system capable of discriminating the material equivalent to human by optimizing a neural network that simulates the connection structure of nerve cells in human brain.

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  • So SHIMOOKA, Tetsuya AKAGI, Shujiro DOHTA, Wataru KOBAYASHI, Takashi S ...
    2019 Volume 12 Issue 1 Pages 10-18
    Published: 2019
    Released: December 10, 2019

     Based on Japanese aging society, a welfare pneumatic equipment to execute a rehabilitation for the temporally injured elderly and disabled is actively researched and developed. In the previous study, a portable rehabilitation device using extension type flexible pneumatic actuators (EFPAs), built-in quasi-servo valves and built-in displacement sensors using a wire type linear potentiometer was proposed and tested. In this study, to increase the generated force and bending stiffness of the device, the actuator that has three parallel arranged EFPAs with sponge cover was proposed and tested. As a result, the generated force of the improved actuator becomes 1.5 times than the previous one. The portable rehabilitation device using the improved actuator was proposed and tested. The built-in attitude control system using valves, sensor and an embedded controller was developed. The attitude control based on the analytical model of the device was also proposed. As a result, it can be found that the displacement of each actuator can trace well for each desired position.

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