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Versatile Optimization
Linköping University, Department of Management and Engineering, Mechanics . Linköping University, The Institute of Technology.ORCID iD: 0000-0002-6267-3847
Mid Sweden University.
2001 (English)In: Nordic MATLAB Conference Proceedings Oslo, Norway, October 17‐18, 2001, 207‐212- p.Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2001. 207‐212- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-12908OAI: oai:DiVA.org:liu-12908DiVA: diva2:17371
Available from: 2008-01-28 Created: 2008-01-28 Last updated: 2015-01-14
In thesis
1. On Optimization of Injection Molding Cooling
Open this publication in new window or tab >>On Optimization of Injection Molding Cooling
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Trondheim: , 2008
Series
Doctoral thesis at NTNU, ISSN 1503-8181 ; 2008:113
Keyword
free-fom fabrication, injection molding, simulation, optimization, cooling, rapid tooling, warpage
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:miun:diva-7980 (URN)978-82-471-8270-3 (ISBN)978-82-471-8284-0 (ISBN)
Public defence
2008-05-29, Rådssalen, Hovedbygningen, Gløshaugen, Trondheim, 10:15 (Swedish)
Opponent
Supervisors
Projects
Sportstech
Available from: 2009-01-07 Created: 2009-01-06 Last updated: 2009-12-11Bibliographically approved
2. Computational Biomechanics in Cross-country Skiing
Open this publication in new window or tab >>Computational Biomechanics in Cross-country Skiing
2008 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Traditionally, research on cross‐country skiing biomechanics is based mainly on experimental testing alone. Trying a different approach, this thesis explores the possibilities of using computational musculoskeletal biomechanics for cross‐country skiing. As far as the author knows, this has not been done before.

Cross‐country skiing is both fast and powerful, and the whole body is used to generate movement. Consequently, the computational method used needs to be able to handle a full‐body model with lots of muscles. This thesis presents several simulation models created in the AnyBody Modeling System, which is based on inverse dynamics and static optimization. This method allows for measurementdriven full‐body models with hundreds of muscles and rigid body segments of all major body parts.

A major result shown in the thesis is that with a good simulation model it is possible to predict muscle activation. Even though there is no claim of full validity of the simulation models, this result opens up a wide range of possibilities for computational musculoskeletal biomechanics in cross‐country skiing. Two example of new possibilities are shown in the thesis, finding antagonistic muscle pairs and muscle load distribution differences in different skiing styles. Being able to perform optimization studies and asking and answering “what if”‐questions really gives computational methods an edge compared to traditional testing.

To conclude, a combination of computational and experimental methods seems to be the next logical step to increase the understanding of the biomechanics of crosscountry skiing.

Abstract [sv]

Traditionellt har biomekaniska forskningsstudier av längdskidåkning baserats helt och hållet på experimentella metoder. För att prova ett annat angreppssätt undersöks i denna avhandling vilka möjligheter som beräkningsbaserad biomekanik kan ge för längdskidåkning. Så vida författaren vet, har detta inte gjorts tidigare.

Längdskidåkning innehåller snabba och kraftfulla helkroppsrörelser och därför behövs en beräkningsmetod som kan hantera helkroppsmodeller med många muskler. Avhandlingen presenterar flera simuleringsmodeller skapade i AnyBody Modeling System, som baseras på inversdynamik och statisk optimering. Denna metod tillåter helkroppsmodeller med hundratals muskler och stelkroppssegment av de flesta kroppsdelarna.

Ett resultat som avhandlingen visar är att med en bra simuleringsmodell är det möjligt att förutsäga muskelaktiviteten för en viss rörelse och belastning på kroppen. Även om ingen validering av simuleringsmodellen ges, så visar ändå resultatet att beräkningsbaserad biomekanik ger många nya möjligheter till forskningsstudier av längdskidåkning. Två exempel visas, hur muskelantagonister kan hittas samt hur lastfördelningen mellan musklerna förändras då skidåkaren förändrar stilen. Att kunna genomföra optimeringsstudier samt fråga och svara på ”vad händer om”‐ frågor ger beräkningsbaserad biomekanik en fördel i jämförelse med traditionell testning.

Slutsatsen är att en kombination av beräkningsbaserade och experimentella metoder borde vara nästa steg för att addera insikt om längdskidåkningens biomekanik.

Place, publisher, year, edition, pages
Institutionen för ekonomisk och industriell utveckling, 2008. 7 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1346
Keyword
Computer simulation, Inverse dynamics, Musculoskeletal, Optimization, Simulation model, Sports, Computational Biomechanics, Cross‐country Skiing
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-10671 (URN)9789173939867 (ISBN)
Presentation
2008-02-08, Case-salen, Hus A, Campus Valla, Linköpings universitet, Linköping, 13:00 (English)
Opponent
Supervisors
Note

Report code: LIU‐TEK‐LIC‐2008:4. On the day of the defence date the status of article V was: Submitted.

Available from: 2008-01-28 Created: 2008-01-28 Last updated: 2017-12-12Bibliographically approved

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Holmberg, Joakim

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