Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater

In order to improve comfort in soaking in the bathwater, the relationship between the biomechanical load and the bathtub shape has to be clarified. For this purpose, many soaking experiments had to be conducted since it was necessary to measure the reaction forces acting on a human from the bathtub...

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Autores principales:	Takanao FUJII, Ayaka KAMADA, Ryota NAKAMURA, Tomohisa KATO, Motomu NAKASHIMA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	biomechanics bathtub soaking posture joint torque simulation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/6c9c713e5eed48bc855ae5e291fcd9ac
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spelling	oai:doaj.org-article:6c9c713e5eed48bc855ae5e291fcd9ac2021-11-26T07:11:28ZDevelopment of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater2187-974510.1299/mej.17-00243https://doaj.org/article/6c9c713e5eed48bc855ae5e291fcd9ac2017-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_17-00243/_pdf/-char/enhttps://doaj.org/toc/2187-9745In order to improve comfort in soaking in the bathwater, the relationship between the biomechanical load and the bathtub shape has to be clarified. For this purpose, many soaking experiments had to be conducted since it was necessary to measure the reaction forces acting on a human from the bathtub experimentally. The objective of this study was to construct an algorithm to estimate reaction forces from a bathtub in order to calculate joint torque as biomechanical loads without experiments for given bathtub shapes and soaking postures. This algorithm calculates distribution of reaction forces which minimizes weighted summation of i) sum of squares of reaction forces, ii) joint torques of hip and knee joints and iii) friction force on the back, considering gravity, buoyancy and passive elastic joint torque. The weighting coefficients were expressed as a function of bathing posture including parameters determined for each person to reflect influence of differences among the individual. In order to examine this algorithm, an experiment to obtain the bathing posture and reaction forces for 10 participants and 24 posture conditions was conducted. It was found that the estimated reaction forces were consistent well with the measured values.Takanao FUJIIAyaka KAMADARyota NAKAMURATomohisa KATOMotomu NAKASHIMAThe Japan Society of Mechanical Engineersarticlebiomechanicsbathtubsoaking posturejoint torquesimulationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 17-00243-17-00243 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	biomechanics bathtub soaking posture joint torque simulation Mechanical engineering and machinery TJ1-1570
spellingShingle	biomechanics bathtub soaking posture joint torque simulation Mechanical engineering and machinery TJ1-1570 Takanao FUJII Ayaka KAMADA Ryota NAKAMURA Tomohisa KATO Motomu NAKASHIMA Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
description	In order to improve comfort in soaking in the bathwater, the relationship between the biomechanical load and the bathtub shape has to be clarified. For this purpose, many soaking experiments had to be conducted since it was necessary to measure the reaction forces acting on a human from the bathtub experimentally. The objective of this study was to construct an algorithm to estimate reaction forces from a bathtub in order to calculate joint torque as biomechanical loads without experiments for given bathtub shapes and soaking postures. This algorithm calculates distribution of reaction forces which minimizes weighted summation of i) sum of squares of reaction forces, ii) joint torques of hip and knee joints and iii) friction force on the back, considering gravity, buoyancy and passive elastic joint torque. The weighting coefficients were expressed as a function of bathing posture including parameters determined for each person to reflect influence of differences among the individual. In order to examine this algorithm, an experiment to obtain the bathing posture and reaction forces for 10 participants and 24 posture conditions was conducted. It was found that the estimated reaction forces were consistent well with the measured values.
format	article
author	Takanao FUJII Ayaka KAMADA Ryota NAKAMURA Tomohisa KATO Motomu NAKASHIMA
author_facet	Takanao FUJII Ayaka KAMADA Ryota NAKAMURA Tomohisa KATO Motomu NAKASHIMA
author_sort	Takanao FUJII
title	Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
title_short	Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
title_full	Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
title_fullStr	Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
title_full_unstemmed	Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
title_sort	development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/6c9c713e5eed48bc855ae5e291fcd9ac
work_keys_str_mv	AT takanaofujii developmentofanalgorithmtoestimatereactionforcesfrombathtubduringsoakinginthebathwater AT ayakakamada developmentofanalgorithmtoestimatereactionforcesfrombathtubduringsoakinginthebathwater AT ryotanakamura developmentofanalgorithmtoestimatereactionforcesfrombathtubduringsoakinginthebathwater AT tomohisakato developmentofanalgorithmtoestimatereactionforcesfrombathtubduringsoakinginthebathwater AT motomunakashima developmentofanalgorithmtoestimatereactionforcesfrombathtubduringsoakinginthebathwater
_version_	1718409723310505984

Development of an algorithm to estimate reaction forces from bathtub during soaking in the bathwater

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