Modeling of human center of pressure using a viscoelastic-supported inverted pendulum
Preventing falls is crucial for the elderly, and as an initial step, accurately quantifying their current balance abilities is essential. In this regard, the Center of Pressure (COP) has gained attention. This study proposes a novel mechanical model to accurately reproduce the human COP. If the prop...
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2025-04-01
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| Series: | Mechanical Engineering Journal |
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| Online Access: | https://www.jstage.jst.go.jp/article/mej/12/3/12_24-00464/_pdf/-char/en |
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| _version_ | 1849426909408002048 |
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| author | Yoshikazu YAMANAKA Katsutoshi YOSHIDA |
| author_facet | Yoshikazu YAMANAKA Katsutoshi YOSHIDA |
| author_sort | Yoshikazu YAMANAKA |
| collection | DOAJ |
| description | Preventing falls is crucial for the elderly, and as an initial step, accurately quantifying their current balance abilities is essential. In this regard, the Center of Pressure (COP) has gained attention. This study proposes a novel mechanical model to accurately reproduce the human COP. If the proposed model can reproduce the human COP with high accuracy, it would enable the quantitative representation of human balance motion characteristics using model parameters. In this study, we first measured the time series of COP in a standing position from six subjects and constructed the Probability Density Function (PDF) of human COP. To reproduce this PDF, we propose a mechanical model that considers the human body as an inverted pendulum and the human foot as a triangular rigid body supported by viscoelastic material. The model control involves PD control incorporating randomness and dead-band effects. As a result, the proposed model successfully reproduced the characteristics, such as unimodal-peak and bimodal-peak patterns, observed in the human PDF by adjusting the control parameters. Specifically, the reproduction accuracy, which represents the agreement between the human and model PDFs, was over 87%, with an average of 96%. Moreover, we investigated the effect of model parameters on the PDF shape and clarified that increasing the effects of the PD control gain led to the emergence of unimodal-peak characteristics, whereas decreasing the gains resulted in bimodal-peak characteristics. Based on these results, we confirm that our proposed model can effectively parameterize human balancing behavior as observed in the PDF of COP. |
| format | Article |
| id | doaj-art-4dd1580078ea4f45843a52c871ea3304 |
| institution | Kabale University |
| issn | 2187-9745 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj-art-4dd1580078ea4f45843a52c871ea33042025-08-20T03:29:11ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452025-04-0112324-0046424-0046410.1299/mej.24-00464mejModeling of human center of pressure using a viscoelastic-supported inverted pendulumYoshikazu YAMANAKA0Katsutoshi YOSHIDA1Department of Mechanical Systems Engineering, Utsunomiya UniversityDepartment of Mechanical Systems Engineering, Utsunomiya UniversityPreventing falls is crucial for the elderly, and as an initial step, accurately quantifying their current balance abilities is essential. In this regard, the Center of Pressure (COP) has gained attention. This study proposes a novel mechanical model to accurately reproduce the human COP. If the proposed model can reproduce the human COP with high accuracy, it would enable the quantitative representation of human balance motion characteristics using model parameters. In this study, we first measured the time series of COP in a standing position from six subjects and constructed the Probability Density Function (PDF) of human COP. To reproduce this PDF, we propose a mechanical model that considers the human body as an inverted pendulum and the human foot as a triangular rigid body supported by viscoelastic material. The model control involves PD control incorporating randomness and dead-band effects. As a result, the proposed model successfully reproduced the characteristics, such as unimodal-peak and bimodal-peak patterns, observed in the human PDF by adjusting the control parameters. Specifically, the reproduction accuracy, which represents the agreement between the human and model PDFs, was over 87%, with an average of 96%. Moreover, we investigated the effect of model parameters on the PDF shape and clarified that increasing the effects of the PD control gain led to the emergence of unimodal-peak characteristics, whereas decreasing the gains resulted in bimodal-peak characteristics. Based on these results, we confirm that our proposed model can effectively parameterize human balancing behavior as observed in the PDF of COP.https://www.jstage.jst.go.jp/article/mej/12/3/12_24-00464/_pdf/-char/encenter of pressurehuman behaviormechanical modelviscoelastic material support |
| spellingShingle | Yoshikazu YAMANAKA Katsutoshi YOSHIDA Modeling of human center of pressure using a viscoelastic-supported inverted pendulum Mechanical Engineering Journal center of pressure human behavior mechanical model viscoelastic material support |
| title | Modeling of human center of pressure using a viscoelastic-supported inverted pendulum |
| title_full | Modeling of human center of pressure using a viscoelastic-supported inverted pendulum |
| title_fullStr | Modeling of human center of pressure using a viscoelastic-supported inverted pendulum |
| title_full_unstemmed | Modeling of human center of pressure using a viscoelastic-supported inverted pendulum |
| title_short | Modeling of human center of pressure using a viscoelastic-supported inverted pendulum |
| title_sort | modeling of human center of pressure using a viscoelastic supported inverted pendulum |
| topic | center of pressure human behavior mechanical model viscoelastic material support |
| url | https://www.jstage.jst.go.jp/article/mej/12/3/12_24-00464/_pdf/-char/en |
| work_keys_str_mv | AT yoshikazuyamanaka modelingofhumancenterofpressureusingaviscoelasticsupportedinvertedpendulum AT katsutoshiyoshida modelingofhumancenterofpressureusingaviscoelasticsupportedinvertedpendulum |