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Simulation of rowing in an optimization context
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.
KTH, School of Engineering Sciences (SCI), Mechanics, Structural Mechanics.ORCID iD: 0000-0002-5819-4544
2014 (English)In: Multibody system dynamics, ISSN 1384-5640, E-ISSN 1573-272X, Vol. 32, no 3, 337-356 p.Article in journal (Refereed) Published
Abstract [en]

Competitive rowing requires efforts close to the physiological limits, where oxygen consumption is one main aspect. The rowing event also incorporates interactions between the rower, the boat and oars, and water. When the intention is to improve the performance, all these properties make the sport interesting from a scientific point of view, as the many variables influencing the performance form a complex optimization problem. Our aim was to formulate the rowing event as an optimization problem where the movement and forces are completely determined by the optimization, giving at least qualitative indications on good performance. A mechanical model of rigid links was used to represent rower, boat and oars. A multiple phase cyclic movement was simulated where catch slip, driving phase, release slip and recovery were modeled. For this simplified model, we demonstrate the influence of the stated mathematical cost function as well as a parameter study where the optimal performance is related to the planned average boat velocity. The results show qualitatively good resemblance to expected movements for the rowing event. An energy loss model in combination with case specific properties of rower capacities, boat properties, and rigging was required to draw qualitative practical conclusions about the rowing technique.

Place, publisher, year, edition, pages
2014. Vol. 32, no 3, 337-356 p.
Keyword [en]
Optimal control, Biomechanics, Boat-oar-water interaction, Multiple phase optimization
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-102167DOI: 10.1007/s11044-013-9384-5ISI: 000341865400004Scopus ID: 2-s2.0-84920257629OAI: oai:DiVA.org:kth-102167DiVA: diva2:551151
Funder
Swedish National Centre for Research in SportsSwedish Research Council
Note

QC 20141021. Updated from submitted to published.

Available from: 2012-09-10 Created: 2012-09-10 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Simulation of Human Movements through Optimization
Open this publication in new window or tab >>Simulation of Human Movements through Optimization
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Optimization has been used to simulate human neural control and resulting movement patterns. The short term aim was to develop the methodology required for solving the movement optimization problem often arising when modelling human movements. A long term aim is the contribution to increased knowledge about various human movements, wherein postures is one specific case. Simulation tools can give valuable information to improve orthopeadic treatments and technique for training and performance in sports. In one study a static 3D model with 30 muscle groups was used to analyse postures. The activation levels of these muscles are minimized in order to represent the individual’s choice of posture. Subject specific data in terms of anthropometry, strength and orthopedic aids serve as input. The specific aim of this part was to study effects from orthopedic treatment and altered abilities of the subject. Initial validation shows qualitative agreement of posture strategies but further details about passive stiffness and anthropometry are needed, especially to predict pelvis orientation. Four studies dealt with movement optimization. The main methodological advance was to introduce contact constraints to the movement optimization. A freetime multiple phase formulation was derived to be able to analyse movements where different constraints and degrees of freedom are present in subsequent phases of the movements. The athletic long jump, a two foot high jump, a backward somersault and rowing were used as applications with their different need of formulation. Maximum performance as well as least effort cost functions have been explored. Even though it has been a secondary aim in this work the results show reasonable agreement to expected movements in reality. Case specific subject properties and inclusion of muscle dynamics are required to draw conclusions about improvements in the sport activity, respectively.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. x, 48 p.
Series
Trita-MEK, ISSN 0348-467X ; 2012:15
Keyword
multibody system, human movements, optimal control, trajectory optimization, long jump, posture, rowing, somersault
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-102158 (URN)978-91-7501-472-2 (ISBN)
Public defence
2012-09-28, V2, Teknikringen 76, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20120910

Available from: 2012-09-10 Created: 2012-09-10 Last updated: 2012-09-13Bibliographically approved

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Eriksson, Anders

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