Journal of Technology and Social Science (JTSS, J. Tech. Soc. Sci.)
An international open-access peer-reviewed journal
TABLE OF CONTENTS
Development of Vibration Isolation Gloves for High Workability (Second Report)
Yoshio Kurosawa, Kazuyuki Nagashima, Tatsuyuki Edano and Takeshi Ochiai
Journal of Technology and Social Science, Vol.4, No.3, pp.1-7, 2020.
Abstract: Anti-vibration gloves are used as protective equipment for vibration disorder, but due to the thick anti-vibration materials of gloves, poor workability such as difficulty in manual work using fingertips was complained by operators. Therefore, in consideration of workability, we aimed to develop protective equipment whose vibration proof materialfs thickness is thinner than the current one, but has the same vibration isolating performance.
We used urethane as the vibration-proof material. By considering the shape of the urethane sheet and using FEM to design, we made six types of gloves with different sheet shape. The gloves were measured and analyzed for their vibration characteristics, and if they have vibration-proofing performance (vibration transmission ratio of less than 1.0) with a thickness of on their entire body, they could be developed.
Numerical Analysis on Dynamic Behavior of an Occupant in a Decelerating Automobile
Shinichi Maruyama and Takao Yamaguchi
Journal of Technology and Social Science, Vol.4, No.3, pp.8-14, 2020.
Abstract: In this paper, numerical analysis is conducted on dynamic behavior of an occupant in a decelerating automobile. The analytical model consists of a rigid-body LSTC Hybrid III dummy model sat on a seat that consists of rigid plates. Assuming a situation that a self-driving small-size bus is subjected to sudden decelerating acceleration, constraint of the dummy by a seat belt of an air bag is not considered. Both of the dummy and the seat are given same initial velocity with relatively slower range, then the velocity of the seat is decreased with a constant rate. The dynamic responses of the dummy are numerically calculated with the commercial software LS-DYNA. The motions of dummy are discussed under various values of decelerating acceleration and friction constants between seat and dummy.
Test Mass Verification for Free Fall Interferometers
Sachie Shiomi, Shunsuke Watanabe, Taichi Hikosaka, Tatsunori Yamamoto, Hiroki Chiku, Masaru Sasaki and Kou Yamada
Journal of Technology and Social Science, Vol.4, No.3, pp.15-23, 2020.
Abstract: In a free fall interferometer, a test mass or a pair of test masses, which form a part of the interferometer, are put in free fall and the free fall acceleration is measured by the interferometer. In such interferometers, rotations of test masses in free fall could cause a serious disturbance. The rotational disturbance can be minimised by adjusting the location of the centre of mass of each test mass. In previous work, a weighbridge method was applied to locate the centres of mass of prototype test masses for a gravity gradiometer that employs a free fall interferometer. We present a more detailed description of the experiment and measurement results in this paper. Our results show that the uncertainty in the weighbridge method is sufficiently small to verify test mases for the gravity gradiometer that aims to detect differential acceleration to 0.1 Ęgal or 1 ~ 10-9 m/s2.
Control Design Applicable to a Helmet Type Full-face Mask
Song Xu, Yu Cao, Seiji Hashimoto, Yusaku Fujii, Akihiro Takita and Wei Jiang
Journal of Technology and Social Science, Vol.4, No.3, pp.24-30, 2020.
Abstract: Since the worldwide outbreak of COVID-19, the use of face masks has become ubiquitous in most countries, and awareness of using masks has also increased significantly. In our research, a lightweight helmet type full-face mask has been developed. In this development, the precise control has been designed to control the air flow and pressure inside the mask for suppling fresh air and keeping the inside pressure slightly higher than outside. The CO2 alarming system has been introduced for preventing the high concentration of Carbon Dioxide inside the mask. The experimental setup has been constructed based on an Arduino digital controller and experiments has been carried out. The system performance is successfully verified.
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