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Tinnsten, Mats
Publications (10 of 70) Show all publications
Bäckström, M., Carlsson, P., Danvind, J., Koptioug, A., Sundström, D. & Tinnsten, M. (2016). A New Wind Tunnel Facility Dedicated to Sports Technology Research and Development. In: Procedia Engineering: . Paper presented at 11th conference of the International Sports Engineering Association, ISEA 2016, 11 July 2016 through 14 July 2016 (pp. 62-67). Elsevier, 147
Open this publication in new window or tab >>A New Wind Tunnel Facility Dedicated to Sports Technology Research and Development
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2016 (English)In: Procedia Engineering, Elsevier, 2016, Vol. 147, p. 62-67Conference paper, Published paper (Refereed)
Abstract [en]

It is desirable to test sportswear and sports equipment at exactly the same conditions experienced during use. Although outdoor tests are in many cases the most adequate, they are at the same time quite complex, demand special measurement technology and wearable equipment. Results of such tests are often hard to interpret due to large variations because of rapidly varying ambient conditions and individual specifics of human objects, among other factors, which are hard or impossible to control. One common alternative is provided through indoor tests made in a stable, controlled environment. Controlling such parameters as temperature, wind speed and direction, air humidity with indoor facilities intended to replicate ambient conditions, and designed to house large objects, is a complex undertaking. Furthermore, replicating seasonal conditions complicates matters even more. A significant amount of research and development related to the operation of sports and other related equipment at high speeds and windy conditions has been carried out in wind tunnels with different degrees of climatic realism. However, the majority of such facilities are designed and constructed for the automotive industry, the aerospace industry and for marine research. A new wind tunnel facility, opened in March 2015 at the Sports Tech Research Centre at Mid Sweden University, is currently among the very few facilities in the world designed under the direct control of sports technology specialists and dedicated primarily to research and development within sports, outdoor clothing and footwear as well as equipment development and testing. The main goal when constructing this dedicated facility has been to successfully replicate ambient conditions for training and equipment testing in environments with controlled wind speed, temperature (+4 to +35°C) and precipitation (from fine mist to heavy downfall). The wind tunnel facility houses the largest moving belt in Sweden (5 m long and 2.7 m wide) which can be adjusted for leveled, uphill and downhill motion. The moving belt is placed in a 10 m2 test section in which the wind speed can be adjusted to match belt speed or independently up to 55 km/h (without narrowing the test section). A fog and rain system, mounted in the test section, can generate rainy conditions varying from fine mist to heavy monsoon. It is also possible to open the facility in order to allow experiments to be performed in wide range of outdoor, ambient conditions. This paper presents the basic parameters of the new wind tunnel facility. As this facility is open for wider international cooperation, we also report the general directions of current research and the future work planned to be carried out at this facility.

Place, publisher, year, edition, pages
Elsevier, 2016
Series
Procedia Engineering, ISSN 1877-7058
Keywords
climate control, indoor testing, moving belt, product development, wind tunnel
National Category
Sport and Fitness Sciences Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-28942 (URN)10.1016/j.proeng.2016.06.190 (DOI)000387454000011 ()2-s2.0-84982913097 (Scopus ID)
Conference
11th conference of the International Sports Engineering Association, ISEA 2016, 11 July 2016 through 14 July 2016
Note

Conference Paper

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2016-12-02Bibliographically approved
Sundström, D., Bäckström, M., Carlsson, P. & Tinnsten, M. (2015). A four compartment model on human exercise bioenergetics. In: A. Subic, F.K. Fuss, F. Alam, T.Y. Pang and M. Takla (Ed.), Procedia Engineering: . Paper presented at 7th Asia-Pacific Congress on Sports Technology, APCST 2015; IDEC-Universitat Pompeu Fabra123 Balmes StBarcelona; Spain; 23 September 2015 through 25 September 2015 (pp. 4-9). Elsevier, 112
Open this publication in new window or tab >>A four compartment model on human exercise bioenergetics
2015 (English)In: Procedia Engineering / [ed] A. Subic, F.K. Fuss, F. Alam, T.Y. Pang and M. Takla, Elsevier, 2015, Vol. 112, p. 4-9Conference paper, Published paper (Refereed)
Abstract [en]

Performance in endurance sports depends on the athlete's ability to generate power output through muscle contraction. The energy requirements of muscles are satisfied by the alactic and lactic bioenergetic pathways, working anaerobically, and the aerobic oxidative phosphorylation of fats and carbohydrates. The aim of this study was to apply further extensions to hydraulic bioenergetic modelling to better describe the regulation of oxidative fuel selection. For this reason, a four compartment bioenergetic model was introduced and regulation of fat and carbohydrate oxidation was implemented. Further regulation was applied to both oxidative fuel selection and anaerobic glycolysis to depend on the current carbohydrate store. The model was formulated mathematically as differential equations, which were solved numerically to perform simulations of human bioenergetics in exercise. Simulation results showed good consistency with experimental findings.

Place, publisher, year, edition, pages
Elsevier, 2015
Series
Procedia Engineering, ISSN 1877-7058 ; 112
Keywords
Bioenergetics; fuel selection; compartment model; differential equation; numerics
National Category
Sport and Fitness Sciences
Identifiers
urn:nbn:se:miun:diva-25888 (URN)10.1016/j.proeng.2015.07.167 (DOI)000380503800001 ()2-s2.0-84945566907 (Scopus ID)
Conference
7th Asia-Pacific Congress on Sports Technology, APCST 2015; IDEC-Universitat Pompeu Fabra123 Balmes StBarcelona; Spain; 23 September 2015 through 25 September 2015
Available from: 2015-09-21 Created: 2015-09-21 Last updated: 2016-12-21Bibliographically approved
Cronskär, M. (2015). Combined finite element and multibody musculoskeletal investigation of a fractured clavicle with reconstruction plate. Computer Methods in Biomechanics and Biomedical Engineering, 18(7), 740-748
Open this publication in new window or tab >>Combined finite element and multibody musculoskeletal investigation of a fractured clavicle with reconstruction plate
2015 (English)In: Computer Methods in Biomechanics and Biomedical Engineering, ISSN 1025-5842, E-ISSN 1476-8259, Vol. 18, no 7, p. 740-748Article in journal (Refereed) Published
Abstract [en]

This paper addresses the evaluation of clavicle fixation devices, by means of computational models. The aim was to develop

a method for comparison of stress distribution in various fixation devices, to determine whether the use of multibody

musculoskeletal input in such model is applicable and to report the approach. The focus was on realistic loading and the

motivation for the work is that the treatment can be enhanced by a better understanding of the loading of the clavicle and

fixation device. The method can be used to confirm the strength of customised plates, for optimisation of new plates and to

complement experimental studies. A finite element (FE) mesh of the clavicle geometry was created from computed

tomography data and imported into the FE solver where the model was subjected to muscle forces and other boundary

conditions from a multibody musculoskeletal model performing a typical activity of daily life. A reconstruction plate and

screws were also imported into the model. The combination models returned stresses and displacements of plausible

magnitudes in all included parts and the result, upon further development and validation, may serve as a design guideline for

improved clavicle fixation.

Keywords
clavicle, finite element analysis, multibody simulation, bone plate
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-20515 (URN)10.1080/10255842.2013.845175 (DOI)000345141700006 ()24156391 (PubMedID)2-s2.0-84911987251 (Scopus ID)
Note

Published online 24 Oct 2013.

Available from: 2013-12-09 Created: 2013-12-09 Last updated: 2017-12-06Bibliographically approved
Carlsson, P., Ainegren, M., Tinnsten, M., Sundström, D., Esping, B., Koptioug, A. & Bäckström, M. (2015). Cross-Country Ski. In: Braghin F., Cheli F., Maldifassi S., Melzi S. and Sabbioni E. (Ed.), The Engineering Approach to Winter Sports: (pp. 107-152). Springer
Open this publication in new window or tab >>Cross-Country Ski
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2015 (English)In: The Engineering Approach to Winter Sports / [ed] Braghin F., Cheli F., Maldifassi S., Melzi S. and Sabbioni E., Springer, 2015, p. 107-152Chapter in book (Other academic)
Abstract [en]

Cross-country skiing, biathlon and ski orienteering are competitive sports with practitioners who are mostly from countries in the northern hemisphere. The competition season is during the time when the ground is covered with snow, which roughly extends from mid-November to late March. During the rest time of the year, which is a long preparatory period of training for the skiers before the competition season, the skiers use roller skis for dryland training with the aim of imitating skiing on snow. Furthermore, over the last few decades, fairly specific indoor testing methods for cross-country skiers have become possible due to the development of treadmills that allow roller skiing using classical and freestyle techniques.

Place, publisher, year, edition, pages
Springer, 2015
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-26337 (URN)10.1007/978-1-4939-3020-3_5 (DOI)2-s2.0-84955660951 (Scopus ID)978-1-4939-3019-7 (ISBN)
Available from: 2015-12-01 Created: 2015-12-01 Last updated: 2016-12-15Bibliographically approved
Sundström, D., Bäckström, M., Carlsson, P. & Tinnsten, M. (2015). Optimal distribution of power output and braking for corners in road cycling. In: : . Paper presented at Science and Cycling, Utrecht 1-2 July 2015. Utrecht
Open this publication in new window or tab >>Optimal distribution of power output and braking for corners in road cycling
2015 (English)Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
Utrecht: , 2015
Keywords
pacing; corner; power output; braking; road cycling
National Category
Other Engineering and Technologies not elsewhere specified Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-26047 (URN)
Conference
Science and Cycling, Utrecht 1-2 July 2015
Available from: 2015-10-06 Created: 2015-10-06 Last updated: 2015-10-12Bibliographically approved
Sundström, D., Carlsson, P. & Tinnsten, M. (2014). Comparing bioenergetic models for the optimisation of pacing strategy in road cycling. Sports Engineering, 17(4), 207-215
Open this publication in new window or tab >>Comparing bioenergetic models for the optimisation of pacing strategy in road cycling
2014 (English)In: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 17, no 4, p. 207-215Article in journal (Refereed) Published
Abstract [en]

Road cycling performance is dependent on race tactics and pacing strategy. To optimise the pacing strategy for any race performed with no drafting, a numerical model was introduced, one that solves equations of motion while minimising the finishing time by varying the power output along the course. The power output was constrained by two different hydraulic models: the simpler critical power model for intermittent exercise (CPIE) and the more sophisticated Margaria–Morton model (M–M). These were compared with a constant power strategy (CPS). The simulation of the three different models was carried out on a fictional 75 kg cyclist, riding a 2,000 m course. This resulted in finishing times of 162.4, 155.8 and 159.3 s and speed variances of 0.58, 0.26 and 0.29 % for the CPS, CPIE and M–M simulations, respectively. Furthermore, the average power output was 469.7, 469.7 and 469.1 W for the CPS, CPIE and M–M simulations, respectively. The M–M model takes more physiological phenomena into consideration compared to the CPIE model and, therefore, contributes to an optimised pacing strategy that is more realistic. Therefore, the M–M model might be more suitable for future studies on optimal pacing strategy, despite the relatively slower finishing time.

Place, publisher, year, edition, pages
Springer London, 2014
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-21879 (URN)10.1007/s12283-014-0156-0 (DOI)2-s2.0-84920253100 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme
Available from: 2014-04-28 Created: 2014-04-28 Last updated: 2017-12-05Bibliographically approved
Koptyug, A., Bäckström, M. & Tinnsten, M. (2014). Gliding-induced ski vibrations: Approaching proper modeling. In: Procedia Engineering: . Paper presented at 2014 10th Conference of the International Sports Engineering Association, ISEA 2014; Sheffield; United Kingdom; 14 July 2014 through 17 July 2014; Code 106094 (pp. 539-544). , 72
Open this publication in new window or tab >>Gliding-induced ski vibrations: Approaching proper modeling
2014 (English)In: Procedia Engineering, 2014, Vol. 72, p. 539-544Conference paper, Published paper (Refereed)
Abstract [en]

Phenomena of the ski and snow boards vibrations generated in gliding are known for years. In the cross country and jumping skis such vibrations are not very obvious but can play quite positive role reducing the effective gliding friction. The research into the nature of friction-induced vibrations and the factors influencing their frequencies and magnitudes is driven by the desire to control them for improving ski gliding performance. Significant amount of experimental data acquired in the field and laboratory studies is already available making it possible to formulate certain qualitative conclusions. But so far it did not bring comprehensive understanding of the phenomenon and specifically of the mechanisms controlling such vibrations. Modeling is one of the potent tools allowing to deeper understand experimentally studied phenomena and it can provide much stronger quantitative prediction capacity. Present paper discusses possible approaches to modeling of the phenomenon and first results of constructing simplified models. © 2014 The Authors.

Series
Procedia Engineering, ISSN 1877-7058 ; 72
Keywords
Experimental, Gliding efficiency, Induced vibrations, Modeling, Nonlinear, Parametric resonance, Skis
National Category
Sport and Fitness Sciences Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-22629 (URN)10.1016/j.proeng.2014.06.093 (DOI)000346367700091 ()2-s2.0-84903759583 (Scopus ID)
Conference
2014 10th Conference of the International Sports Engineering Association, ISEA 2014; Sheffield; United Kingdom; 14 July 2014 through 17 July 2014; Code 106094
Note

Correspondence Address: Koptyug, A.; Mid Sweden University, SportsTech, Akademigatan 1, SE 831-25, Östersund, Sweden; email: andrei.koptioug@miun.se

Available from: 2014-09-23 Created: 2014-08-20 Last updated: 2016-12-16Bibliographically approved
Sundström, D., Tinnsten, M. & Carlsson, P. (2014). The influence of course bends on pacing strategy in road cycling. In: David James, Simon Choppin, Tom Allen, Jon Wheat, Paul Fleming (Ed.), Conference Proceedings of The Engineering of Sport 10: . Paper presented at The 2014 Conference of the International Sports Engineering Association (pp. 835-840). Elsevier
Open this publication in new window or tab >>The influence of course bends on pacing strategy in road cycling
2014 (English)In: Conference Proceedings of The Engineering of Sport 10 / [ed] David James, Simon Choppin, Tom Allen, Jon Wheat, Paul Fleming, Elsevier, 2014, p. 835-840Conference paper, Published paper (Refereed)
Abstract [en]

Road cycling races in general, but particularly criteriums (short circuit race), have a considerable number of bends along the race course. Sharp bends force the rider to decelerate in order to retain the grip between the tires and the road. This study focused on how these course bends influence the optimal pacing strategy in road cycling. For this purpose, we used a numerical model that simulates cycling by solving the equation of motion. The optimisation was carried out with the Method of Moving Asymptotes, constrained with the Margaria-Morton model for human energetics and a separate course bend constraint. The results showed that sharp course bends greatly affect the pacing strategy and finishing time. The average power output and the average speed decreased with a decrease in the curve radius. Moreover, the kinetic energy lost due to braking in sharp course bends is likely to be the crucial mechanism affecting the finishing time. Therefore, we believe that the outcome of races that contain sharp bends may be strongly dependent on the athlete’s pacing strategy.

Place, publisher, year, edition, pages
Elsevier, 2014
Series
Procedia Engineering, ISSN 1877-7058 ; 72
Keywords
Pacing strategy; power distribution; cycling; bend; performance; optimisation
National Category
Applied Mechanics
Identifiers
urn:nbn:se:miun:diva-22843 (URN)10.1016/j.proeng.2014.06.141 (DOI)000346367700140 ()2-s2.0-84903794163 (Scopus ID)
Conference
The 2014 Conference of the International Sports Engineering Association
Available from: 2014-09-09 Created: 2014-09-09 Last updated: 2016-01-26Bibliographically approved
Ainegren, M., Carlsson, P., Laaksonen, M. S. & Tinnsten, M. (2014). The influence of grip on oxygen consumption and leg forces when using classical style roller skis. Scandinavian Journal of Medicine and Science in Sports, 24(2), 301-310
Open this publication in new window or tab >>The influence of grip on oxygen consumption and leg forces when using classical style roller skis
2014 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 24, no 2, p. 301-310Article in journal (Refereed) Published
Abstract [en]

The purpose of this study was to investigate the influence of classical style roller skis' grip (static friction coefficients, μ S) on cross-country skiers' oxygen consumption and leg forces during treadmill roller skiing, when using the diagonal stride and kick double poling techniques. The study used ratcheted wheel roller skis from the open market and a uniquely designed roller ski with an adjustable camber and grip function. The results showed significantly (P≤0.05) higher oxygen consumption (∼14%), heart rate (∼7%), and lower propulsive forces from the legs during submaximal exercise and a shorter time to exhaustion (∼30%) in incremental maximal tests when using roller skis with a μ S similar to on-snow skiing, while there was no difference between tests when using different pairs of roller skis with a similar, higher μ S. Thus, we concluded that oxygen consumption (skiing economy), propulsive leg forces, and performance time are highly changed for the worse when using roller skis with a lower μ S, such as for on-snow skiing with grip-waxed cross-country skis, in comparison to ratcheted wheel roller skis with several times higher μ S.

Place, publisher, year, edition, pages
John Wiley & Sons, 2014
Keywords
adjustable grip, center of pressure, normal and tangential forces, ratcheted wheel, skiing economy, static friction
National Category
Sport and Fitness Sciences Mechanical Engineering Physiology
Identifiers
urn:nbn:se:miun:diva-16445 (URN)10.1111/sms.12006 (DOI)000332982700011 ()2-s2.0-84896404410 (Scopus ID)
Note

Published online 28 sep 2012

Available from: 2012-06-14 Created: 2012-06-14 Last updated: 2018-01-12Bibliographically approved
Ainegren, M., Carlsson, P. & Tinnsten, M. (2013). A portable roller ski rolling resistance measurement system. In: Subic A, Fuss FK, Clifton P, Chan KM. (Ed.), The Impact of Technology on Sport V: Procedia Engineering. Paper presented at 6th Asia-Pacific Conference on Sports Technology, APCST 2013; Hong Kong; Hong Kong; 18 September 2013 through 20 September 2013; Code 101817 (pp. 79-83). Elsevier
Open this publication in new window or tab >>A portable roller ski rolling resistance measurement system
2013 (English)In: The Impact of Technology on Sport V: Procedia Engineering / [ed] Subic A, Fuss FK, Clifton P, Chan KM., Elsevier, 2013, p. 79-83Conference paper, Published paper (Refereed)
Abstract [en]

Roller skis are used by cross-country skiers, biathletes and ski-orienteers for their snow-free training and in roller ski competitions. Additionally, much of the current sports research into the physiology and biomechanics of crosscountry skiing is conducted indoors on treadmills using roller skis. For elite athletes, the differences in performance are quite small, thus emphasising the importance of knowing the roller skis' rolling resistance coefficient, especially in connection to research and roller ski competitions. The purpose of this study was to develop a roller ski rolling resistance measurement system (P-RRMS) that is portable and therefore useful in different contexts and locations. The P-RRMS was designed as a small treadmill, equipped with roller ski stabilizing lateral supports and a screwed bar for applying different vertical loads on the roller ski. The design uses only one force sensor, with possible measurements of three directions of force and torque around three axes. The weight of the P-RRMS is 100 kg and it is equipped with wheels to facilitate transportation.

Place, publisher, year, edition, pages
Elsevier, 2013
Keywords
Portable device, roller skis, rolling resistance, 3D sensor
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Other Mechanical Engineering
Identifiers
urn:nbn:se:miun:diva-20364 (URN)10.1016/j.proeng.2013.07.001 (DOI)000326266100014 ()2-s2.0-84891692268 (Scopus ID)
Conference
6th Asia-Pacific Conference on Sports Technology, APCST 2013; Hong Kong; Hong Kong; 18 September 2013 through 20 September 2013; Code 101817
Available from: 2013-11-28 Created: 2013-11-28 Last updated: 2018-01-11Bibliographically approved
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