Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement
The frame stiffness in a racing bicycle might influence not only toughness as the frame structure but also performance of an athlete. The purpose of this study is to clarify biodynamic relations between the frame stiffness in a racing bicycle and the physical loads of an athlete by using a forward d...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2019-09-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/85/878/85_19-00191/_pdf/-char/en |
| _version_ | 1797989015823056896 |
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| author | Fumito ITO Kazunori HASE Kazuo UCHIDA |
| author_facet | Fumito ITO Kazunori HASE Kazuo UCHIDA |
| author_sort | Fumito ITO |
| collection | DOAJ |
| description | The frame stiffness in a racing bicycle might influence not only toughness as the frame structure but also performance of an athlete. The purpose of this study is to clarify biodynamic relations between the frame stiffness in a racing bicycle and the physical loads of an athlete by using a forward dynamics simulation model. The human body structure was represented by the 13-rigid-links and 23-degrees-of-freedom model. Based on the theory of multibody dynamics, the frame structure was expressed by combination of 12 rigid pipes, and the frame stiffness was modeled by rotational springs at the connecting joint between the rigid pipes. Spring coefficients were changed according to the thickness of the frame pipes. The pedaling load from the crank was computed by the angular velocity and angular acceleration of the crank. Moreover, the driving force in the bicycle was additionally defined to consider the influence of the frame weight on the human joint load. The human body model was driven by the joint toques to minimize the cost function consisting of the joint loads in the human body and the driving force in the bicycle, and also to keep desired angular velocity of the crank. Validity of the simulation was evaluated by comparing the joint angles and torques with the measured ones. As for the result, the larger stiffness of the frame resulted in smaller the joint loads in the human body, and optimal stiffness would be determined by the balance between the joint loads in the human body and the driving force in the bicycle. |
| first_indexed | 2024-04-11T08:12:16Z |
| format | Article |
| id | doaj.art-3c0b8d0f9254433bb5bf7dc2c18c0b79 |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-11T08:12:16Z |
| publishDate | 2019-09-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-3c0b8d0f9254433bb5bf7dc2c18c0b792022-12-22T04:35:16ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612019-09-018587819-0019119-0019110.1299/transjsme.19-00191transjsmeSimulation analysis of the influence of the frame stiffness in racing bikes on pedaling movementFumito ITO0Kazunori HASE1Kazuo UCHIDA2Graduate School of Science and Engineering, Tokyo Metropolitan UniversityFaculty of Systems Design, Tokyo Metropolitan UniversityBridgestone CorporationThe frame stiffness in a racing bicycle might influence not only toughness as the frame structure but also performance of an athlete. The purpose of this study is to clarify biodynamic relations between the frame stiffness in a racing bicycle and the physical loads of an athlete by using a forward dynamics simulation model. The human body structure was represented by the 13-rigid-links and 23-degrees-of-freedom model. Based on the theory of multibody dynamics, the frame structure was expressed by combination of 12 rigid pipes, and the frame stiffness was modeled by rotational springs at the connecting joint between the rigid pipes. Spring coefficients were changed according to the thickness of the frame pipes. The pedaling load from the crank was computed by the angular velocity and angular acceleration of the crank. Moreover, the driving force in the bicycle was additionally defined to consider the influence of the frame weight on the human joint load. The human body model was driven by the joint toques to minimize the cost function consisting of the joint loads in the human body and the driving force in the bicycle, and also to keep desired angular velocity of the crank. Validity of the simulation was evaluated by comparing the joint angles and torques with the measured ones. As for the result, the larger stiffness of the frame resulted in smaller the joint loads in the human body, and optimal stiffness would be determined by the balance between the joint loads in the human body and the driving force in the bicycle.https://www.jstage.jst.go.jp/article/transjsme/85/878/85_19-00191/_pdf/-char/enhuman dynamicsbiomechanicssports engineeringmultibody dynamicsforward dynamicsoptimizationjoint load |
| spellingShingle | Fumito ITO Kazunori HASE Kazuo UCHIDA Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement Nihon Kikai Gakkai ronbunshu human dynamics biomechanics sports engineering multibody dynamics forward dynamics optimization joint load |
| title | Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| title_full | Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| title_fullStr | Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| title_full_unstemmed | Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| title_short | Simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| title_sort | simulation analysis of the influence of the frame stiffness in racing bikes on pedaling movement |
| topic | human dynamics biomechanics sports engineering multibody dynamics forward dynamics optimization joint load |
| url | https://www.jstage.jst.go.jp/article/transjsme/85/878/85_19-00191/_pdf/-char/en |
| work_keys_str_mv | AT fumitoito simulationanalysisoftheinfluenceoftheframestiffnessinracingbikesonpedalingmovement AT kazunorihase simulationanalysisoftheinfluenceoftheframestiffnessinracingbikesonpedalingmovement AT kazuouchida simulationanalysisoftheinfluenceoftheframestiffnessinracingbikesonpedalingmovement |