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Journal of Mechanical and Electrical Intelligent System (JMEIS, J. Mech. Elect. Intel. Syst.) An international open-access peer-reviewed journal ISSN 2433-8273
Vol.3, No.1
TABLE OF CONTENTS
Articles
Measurement System for the Clothing Pressure of a Spinal Orthosis using Multiple Pressure Sensors Koji Sakamoto, Kodai Kitagawa, Yuji Katae, Naoki Chijiwa, Aki Kuwazono, Hisashi Arizono, Chikamune Wada Journal of Mechanical and Electrical Intelligent System, Vol.3, No.1, pp.1-9, 2020. Abstract: A spinal orthosis is used for rehabilitation after vertebral fractures. However, a spinal orthosis can cause discomfort to a patient because of clothing pressure during activities of daily living (ADLs). It is therefore necessary to quantitatively evaluate the clothing pressure and to develop a new design of spinal orthosis that decreases discomfort. We developed a system to measure clothing pressure using multiple pressure sensors. Furthermore, we studied the clothing pressure from the spinal orthosis using the proposed measurement system during a picking-up motion, which is one of the ADLs, under two different wearing conditions. The results showed that the measurement system can quantify the changes in pressure over time in different areas and under different wearing conditions during a picking-up motion. The results suggest that this system could be used to evaluate the differences in clothing pressure exerted by the spinal orthosis during ADLs under different wearing conditions.
Analysis and Experiments on Nonlinear Vibrations of a Post-buckled Beam with a Stepped Section Shinichi Maruyama, Motofumi Hachisu, Ken-ichi Nagai, Takao Yamaguchi Journal of Mechanical and Electrical Intelligent System, Vol.3, No.1, pp.10-15, 2020. Abstract: Analytical and experimental results are presented on nonlinear vibrations of a post-buckled beam with a stepped section constrained by an axial elastic spring. In the experiment, the beam is excited laterally under periodic acceleration, and the dynamic responses of the beam are measured. In the analysis, the beam is divided into a few segments. The deflection of the beam is expanded with the mode shape function that is expressed with the product of truncated power series and trigonometric functions. Taking the axial displacement, the deflections, slopes, bending moments and shearing forces at the nodes of the segments as unknown variables, nonlinear coupled ordinary differential equations are derived with the Galerkin procedure. Neglecting the axial inertia of the beam, the axial displacements at the nodes are expressed as nonlinear functions of the deflections, slopes, bending moments and shearing forces, nonlinear responses are calculated with the harmonic balance method and with the direct time integration. Fairly good agreements are obtained between results of experiment and analysis.
Development of training software for elderly persons practicing a squat exercise Nobuaki Nakazawa, Yuto Takigawa, Toshikazu Matsui Journal of Mechanical and Electrical Intelligent System, Vol.3, No.1, pp.16-21, 2020. Abstract: This paper describes the development of an exercise support software by using Kinect sensor. Contactless sensing of squat was performed using the coordinates of the shoulder acquired by Kinect sensor. We implemented measurement mode and game mode in the application. In the measurement mode, it is possible to obtain the optimal exercise time of the game mode. At the same time, the threshold for recognizing squat movement can be derived by up and down reciprocation of shoulder movement in this mode. In the game, the user operates the position of the character to hit the ball flowing from left to right. As the user's shoulder position moves up and down, the game character moves up and down. The score is evaluated on a scale of hundred points. The score of playing the game can be saved for each individual. The experiment was conducted to verify the characterization of the squat movement and the practicality of the application. As a result, the utility of the application was shown.
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