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  • 51.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    A four compartment model on human exercise bioenergetics2015Inngår i: Procedia Engineering / [ed] A. Subic, F.K. Fuss, F. Alam, T.Y. Pang and M. Takla, Elsevier, 2015, Vol. 112, s. 4-9Konferansepaper (Fagfellevurdert)
    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.

  • 52.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Bäckström, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Optimal distribution of power output and braking for corners in road cycling2015Konferansepaper (Fagfellevurdert)
  • 53.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Ståhl, Fredrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Numerical optimization of pacing strategy in cross-country skiing2013Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 47, nr 6, s. 943-950Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    When studying events involving locomotive exercise,such as cross-country skiing, one generally assumesthat pacing strategies (i.e. power distributions) have a significantimpact on performance. In order to better understandthe importance of pacing strategies, a program isdeveloped for numerical simulation and optimization of thepacing strategy in cross-country ski racing. This programcomputes the optimal pacing strategy for an arbitrary athleteskiing on a delineated course. The locomotion of theskier is described by introducing the equations of motionfor cross-country skiing. A transformation of the motionequations is carried out in order to improve the simulation. Furthermore, a nonlinear optimization routine is connectedto the simulation program. Simulation and optimization areperformed on a fictional male skier. Results show that it ispossible to attain an optimal pacing strategy by simulatingcross-country skiing while connecting nonlinear optimizationroutines to the simulation. It is also shown that an optimalpacing strategy is characterized by minor variations inspeed. In our opinion, this kind of optimization could serveas essential preparations before important competitions.

  • 54.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Comparing bioenergetic models for the optimisation of pacing strategy in road cycling2014Inngår i: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 17, nr 4, s. 207-215Artikkel i tidsskrift (Fagfellevurdert)
    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.

  • 55.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    On Optimization of Pacing Strategy in Road Cycling2013Inngår i: 6TH ASIA-PACIFIC CONGRESS ON SPORTS TECHNOLOGY (APCST), Melbourne: Elsevier, 2013, s. 118-123Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The wide-spread use of power-meters in today’s competitive road cycling has been an incentive for optimizing the distribution of power output i.e. the pacing strategy. Therefore, the aim of this study was to examine the effects of course profile on the optimal pacing strategy in road cycling. For that reason, three course profiles, built up by cubical splines, were simulated with a numerical program for a fictional cyclist. The numerical program solves the equations of motion of the athlete and bicycle while an optimal design algorithm is connected to the simulation, aiming to minimize the time between start and finish. The optimization is constrained by a power-endurance concept named the critical power model for intermittent exercise. Three course profiles with the same total elevation but different number of hills were studied. The time gains of an optimized pacing strategy were 3.0%, 5.0%, and 2.3% and the speed variances at the optimized pacing strategy were 6.54%, 1.18%, and 0.84% for the single plateau, double hill, and quadruple hill courses respectively. Hence, the course profile has great effect on the optimal pacing strategy. In addition, the results show that the potential improvement of adopting an optimized pacing strategy is substantial at the highest level of competition.

  • 56.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Optimizing pacing strategies on a hilly track in cross-country skiing2011Inngår i: Procedia Engineering, Elsevier, 2011, Vol. 13, s. 10-16Konferansepaper (Fagfellevurdert)
    Abstract [en]

    During events involving locomotive exercise, such as cross-country skiing, it is believed that pacing strategies (i.e. power distribution) have a significant impact on performance. Therefore, a program was developed for the numerical simulation and optimization of cross-country ski racing, one that numerically computes the optimal pacing strategy for a continuous track. The track is modelled by a set of cubic splines in two dimensions and can be used to simulate a closed loop track or one with the start and finish at different locations. For an arbitrary point on the two dimensional track, equations of motion are formulated parallel and normal to the track, considering the actual slope and curvature of the track. Forces considered at the studied point are the gravitational force, the normal force between snow and skis, the drag force from the wind, the frictional force between snow and ski and the propulsive force from the skier, where the latter is expressed as the available power divided by the actual speed. The differential equations of motion are solved from start to finish using the Runge-Kutta-Fehlberg method. The optimization of the ski race is carried out with the Method of Moving Asymptotes (MMA) which minimizes the racing time by choosing the optimum distribution of available power. Constraints for minimum, maximum and average power are decided by conditions of scaling by body size. Results from a simulated ski competition with optimized power distribution on a real track are presented.

  • 57.
    Sundström, David
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Avdelningen för kvalitetsteknik, maskinteknik och matematik.
    The influence of course bends on pacing strategy in road cycling2014Inngår i: Conference Proceedings of The Engineering of Sport 10 / [ed] David James, Simon Choppin, Tom Allen, Jon Wheat, Paul Fleming, Elsevier, 2014, s. 835-840Konferansepaper (Fagfellevurdert)
    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.

  • 58.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Numerical and experimental study of acoustic and structural optimization1999Doktoravhandling, monografi (Annet vitenskapelig)
    Abstract [en]

    The main objective with this thesis has been to create a procedure (method and program code) that enables automatic optimization of acoustic response from vibrating structures. Automatic means that the proposed method, on its own, should be able to find the desired acoustic quantities for a given problem formulation by altering given variables. The main parts of such an optimization process are: availability to perform structural dynamic analysis, acoustic analysis, and optimization analysis. The structural dynamic analysis comprises eigenmode and response analyses, tools necessary to calculate surface velocities for the actual structure. These calculations are performed using a modified version of the finite element (FE) code FEMP [31]. This FE code is implemented in the acoustic optimization code and used in Papers B, C, D, E, and F. The surface velocities are used as input in the acoustic analyses. The acoustic analyses in this thesis comprises calculation of sound pressure and/or sound intensity amplitudes in specified regions outside vibrating structures surrounded by air. Calculation of the acoustic quantities (pressure and intensity) is performed using a boundary element (BE) code. The BE code is developed and used in Papers C, D, E, and F. The numerical results in Paper C is compared with experimental results A slightly modified version of the optimization routine MMA (method of moving asymptotes) [21] is used for optimization analysis together with the above-mentioned FE and BE codes. The MMA is in Paper A used for a purely structural optimization problem. The acoustic optimization process, comprising FE, BE, and optimization analysis, is performed in Papers D, E, and F. A comparison between numerical and experimental results was also performed in Paper F.

  • 59.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Numerical and experimental study of dynamic and acoustic behaviour of vibrating structures1996Licentiatavhandling, monografi (Annet vitenskapelig)
  • 60.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Numerical prediction of acoustic pressure and intensity1994Rapport (Annet vitenskapelig)
  • 61.
    Tinnsten, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Optimization of acoustic response: a numerical and experimental comparison2000Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 19, nr 2, s. 122-129Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Acoustic optimization within structural dynamics involves automatic changes of structural design variables such as geometric dimensions, shell thickness, material parameters, fiber density and orientation angles, and others to obtain minimum noise or a specified sound quality in specified regions inside or outside the structure. The objective of the present paper is to compare numerical optimization results with experimental ones. The analysed structure is geometrically simple; a closed cylinder. The objective function is the sound intensity at specified points outside the structure. The variable used is the shell thickness. The structural dynamic behaviour is analysed with the finite element method and the acoustic analysis is performed with the boundary element method.

  • 62.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Important spruce properties determined by the use of numerical optimization.2004Inngår i: International Symposium on Musical Acoustics, March 31st to April 3rd, 2004, in Nara/Japan:: Proceedings of ISMA 2004, 2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Numerical modeling of violins, or parts of it, can be used in order to enhance the understanding on how different parameters affects the vibration properties and the characteristics of the sound emanating from it. Crucial for the results from these studies is the correctness of the input data for the numerical analysis. One very important, and not easily obtained, group of input data is the wooden material parameters for the part of the violin subjected to analysis. In this study a new method for determining these important material parameters for blanks for violin tops is proposed. In the proposed method a FEM-code is linked together with a stochastic optimization algorithm in order to, in an automatic fashion, determine the material parameters.

  • 63.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Numerical optimization of violin top plates2002Inngår i: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 88, s. 278-285Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Wood for musical instruments exhibits large variations in the material parameters, directly influencing the properties of the vibrating structure. The objective of this study is to show that it is possible to compensate for differences in the material parameters of violin top plates by changing the distributions of plate thickness and arch height, thus keeping the eigenfrequencies unchanged. Wood has a cellular structure and is here modeled with a honeycomb model. The thickness and arch height compensation is determined through a stochastic optimization method called simulated annealing (35 refs.)

  • 64.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Optimization - A useful tool in the process of designing violin top plates?2005Inngår i: International Congress on Sound and Vibration ; 12 (Lisbon) : 2005.07.11-14. Programme and book of abstracts: ICSV ; 12 (Lisbon) : 2005.07.11-14, Lisbon: Instituto Superior Técnico , 2005, s. 3085-3092Konferansepaper (Fagfellevurdert)
  • 65.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Esping, Björn
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Jonsson, M
    Important wood properties for blanks for violin tops determined by use of numerical optimizationManuskript (Annet vitenskapelig)
  • 66.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Carlsson, Peter
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Jonsson, Mikael
    Luleå universitet.
    Jonsson, Mikael
    Stochastic optimization of acoustic response: a numerical and experimental comparison2002Inngår i: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 23, nr 6, s. 405-411Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The objective of the work presented is to compare results from numerical optimization with experimental data and to highlight and discuss the differences between two fundamentally different optimization methods. The problem domain is minimization of acoustic emission and the structure used in the work is a closed cylinder with forced vibration of one end. The optimization method used in this paper is simulated annealing (SA), a stochasticmethod. The results are compared with those from a gradient-based method used on the same structure in an earlier paper (see Tinnsten 2000).

  • 67.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Dahlén, Leon
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Holmberg, Joakim
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Holmberg, Hans Christer
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för hälsovetenskap.
    Projekt Davos: hjälper längdlandslaget att åka fortare2004Inngår i: Svensk Idrottsforskning, ISSN 1103-4629, Vol. 13, nr 1, s. 25-27Artikkel i tidsskrift (Fagfellevurdert)
  • 68.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Esping, Björn
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Jonsson, Mikael
    Optimization of acoustic response1999Inngår i: Structural Optimization, ISSN 0934-4373, Vol. 18, nr 1, s. 36-47Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The expression 'acoustic optimization' can be applied to numerous different disciplines within the field of acoustics. From seismic waves, sound in the atmosphere through bioacoustic, psychoacoustics, and room and theater acoustics over shock and vibration in mechanical structures. This paper deals with the latter. Sound generated by vibrating structures is often called noise which is to be minimized. However, not all vibrating structures produce noise, for example the violin is also a vibrating structure that in most people's opinion produces sound called music. In the case of the violin, great effort is made not to minimize but to optimize the sound, i.e. to get the 'right' sound out of the structure. Acoustic optimization within this discipline involves automatic changes of structural design variables to obtain minimum or specified sound in specified regions inside or outside the structure. Examples of problem formulations and some theoretical considerations in the field of acoustic optimization in connection with vibrating mechanical structures will be pointed out. Four simple test cases are included as numerical examples of the method proposed.

  • 69.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Jonsson, M
    Acoustic optimization of plate vibration: a numerical example1999Inngår i: Vibration, Noise and Structural Dynamics '99 : proceedings of the International Conference on Vibration, Noise and Structural Dynamics, Ramada Hotel, Venice, 28 to 30 April 1999, Staffordshire University , 1999, s. 576-Konferansepaper (Fagfellevurdert)
  • 70.
    Tinnsten, Mats
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik, fysik och matematik.
    Jonsson, M
    Johansson, O
    Prediction and verification of acoustic radiation2001Inngår i: Acustica - Acta Acustica, ISSN 0001-7884, Vol. 87, nr 1, s. 117-127Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this paper the boundary element method (BEM) is used to determine acoustic-related quantities in open domains from vibrating structures. Two different types of structures have been analysed, a sphere and an engine transmission cover. The analysed acoustical quantities are pressure amplitude and pressure and intensity amplitude respectively. The numerical results were compared with the analytical and experimental results. In both cases, the sphere and the transmission cover, the input to the BEM program is the normal velocity of the structure surface. The analysed frequency range was in the case of the sphere 100-5000 Hz and a good agreement between numerical and analytical results was obtained up to frequency 3500 Hz. In the engine transmission cover case, the analysed frequency range was 434-3552 Hz with an overall good agreement between numerical and experimental results in the frequency range of 644-1848 Hz

12 51 - 70 of 70
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