Development of an algorithm to estimate soaking posture in the bathwater
Soaking in bathwater has been a familiar custom for the Japanese for a long period of time. The authors discussed bathing comfort from the viewpoint of biomechanics in a previous study. However, it took a lot of effort to evaluate the joint torques during soaking in the water while conducting the ex...
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The Japan Society of Mechanical Engineers
2019
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oai:doaj.org-article:9847fb6985cc4348b8d97686d2a9b5ef2021-11-29T05:45:37ZDevelopment of an algorithm to estimate soaking posture in the bathwater2187-974510.1299/mej.18-00532https://doaj.org/article/9847fb6985cc4348b8d97686d2a9b5ef2019-07-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/6/4/6_18-00532/_pdf/-char/enhttps://doaj.org/toc/2187-9745Soaking in bathwater has been a familiar custom for the Japanese for a long period of time. The authors discussed bathing comfort from the viewpoint of biomechanics in a previous study. However, it took a lot of effort to evaluate the joint torques during soaking in the water while conducting the experiments. Therefore, it was required to estimate the soaking postures and center of pressure (COP) in order to conduct the biomechanical evaluation with minimal experiments. The objective of this research was to develop an algorithm to estimate soaking posture and COP. In this study, it was assumed that a human took a soaking posture in the bathtub so as to minimize muscle exertion, that is, to minimize the joint torque as much as possible. Based on this assumption, an algorithm to estimate the soaking posture was constructed as an optimization problem of the objective function. An experiment was conducted for the purpose of validating the estimation algorithm. In this experiment, three kinds of bathtub shapes were tested for five healthy males. As a result, the estimated posture and COP were in good agreement with the measured one. The maximum error of the joint angle was 6.0% among all participants. The average values of the error in the location of the COP for each condition were 0.01 m or less. From the results of the present study, the possibility of estimation the joint torque is suggested.Ryota NAKAMURATakuro YONEDATomohisa KATOMotomu NAKASHIMAThe Japan Society of Mechanical Engineersarticlebiomechanicsbathtubsoaking posturecenter of pressure(cop)joint torquesimulationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 6, Iss 4, Pp 18-00532-18-00532 (2019) |
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DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
biomechanics bathtub soaking posture center of pressure(cop) joint torque simulation Mechanical engineering and machinery TJ1-1570 |
| spellingShingle |
biomechanics bathtub soaking posture center of pressure(cop) joint torque simulation Mechanical engineering and machinery TJ1-1570 Ryota NAKAMURA Takuro YONEDA Tomohisa KATO Motomu NAKASHIMA Development of an algorithm to estimate soaking posture in the bathwater |
| description |
Soaking in bathwater has been a familiar custom for the Japanese for a long period of time. The authors discussed bathing comfort from the viewpoint of biomechanics in a previous study. However, it took a lot of effort to evaluate the joint torques during soaking in the water while conducting the experiments. Therefore, it was required to estimate the soaking postures and center of pressure (COP) in order to conduct the biomechanical evaluation with minimal experiments. The objective of this research was to develop an algorithm to estimate soaking posture and COP. In this study, it was assumed that a human took a soaking posture in the bathtub so as to minimize muscle exertion, that is, to minimize the joint torque as much as possible. Based on this assumption, an algorithm to estimate the soaking posture was constructed as an optimization problem of the objective function. An experiment was conducted for the purpose of validating the estimation algorithm. In this experiment, three kinds of bathtub shapes were tested for five healthy males. As a result, the estimated posture and COP were in good agreement with the measured one. The maximum error of the joint angle was 6.0% among all participants. The average values of the error in the location of the COP for each condition were 0.01 m or less. From the results of the present study, the possibility of estimation the joint torque is suggested. |
| format |
article |
| author |
Ryota NAKAMURA Takuro YONEDA Tomohisa KATO Motomu NAKASHIMA |
| author_facet |
Ryota NAKAMURA Takuro YONEDA Tomohisa KATO Motomu NAKASHIMA |
| author_sort |
Ryota NAKAMURA |
| title |
Development of an algorithm to estimate soaking posture in the bathwater |
| title_short |
Development of an algorithm to estimate soaking posture in the bathwater |
| title_full |
Development of an algorithm to estimate soaking posture in the bathwater |
| title_fullStr |
Development of an algorithm to estimate soaking posture in the bathwater |
| title_full_unstemmed |
Development of an algorithm to estimate soaking posture in the bathwater |
| title_sort |
development of an algorithm to estimate soaking posture in the bathwater |
| publisher |
The Japan Society of Mechanical Engineers |
| publishDate |
2019 |
| url |
https://doaj.org/article/9847fb6985cc4348b8d97686d2a9b5ef |
| work_keys_str_mv |
AT ryotanakamura developmentofanalgorithmtoestimatesoakingpostureinthebathwater AT takuroyoneda developmentofanalgorithmtoestimatesoakingpostureinthebathwater AT tomohisakato developmentofanalgorithmtoestimatesoakingpostureinthebathwater AT motomunakashima developmentofanalgorithmtoestimatesoakingpostureinthebathwater |
| _version_ |
1718407600374022144 |