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    Wyświetlanie 1-6 z 6
    Tytuł:
    The influence of mass parameters and gear ratio on the speed and energy expenditure of a cyclist
    Autorzy:
    Stępniewski, A. A.
    Grudziński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/307036.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bicycle
    dynamics
    kinematics
    platform pedal
    theoretical model
    rower
    dynamika
    kinematyka
    Opis:
    The wavelength of moment of active forces (driving forces) for a full cycle while pedaling with platform pedals was determined. There was defined the value of moment of passive forces, depending on drag, rolling resistance and grade of surface. Kinematic motion parameters were determined from the equation of motion of the machine, which was solved numerically. In numerical example, there were determined and compared the temporal courses of bicycle speed for possible gear ratios for the two different waveforms of the driving torque – the determined, the time-varying and the constant ones. There were compared extreme values of active and passive forces, the kinetic energy of the bike and work expended by the rider at a specified time.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 2; 47-55
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Verification of technical parameters and modification of upright exercise bike construction
    Autorzy:
    Stępniewski, A. A.
    Grudziński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/264791.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    rower treningowy
    układ napędowy
    koło zamachowe
    ergometr
    dane techniczne
    technical data
    ergometer
    drive system
    flywheel
    exercise bike
    Opis:
    In this paper, the technical data provided by the sellers of an exercise bike FALCON SG-911B SAPPHIRE have been verified. After dismantling the bike, the dimensions of the components of the transmission of motion were measured and the mass parameters of the flywheel were set. In order to increase the mass moment of inertia reduced to an axis of the crankshaft, construction changes were proposed. The values of the braking torque of the magnetic brake at subsequent resistance levels were measured. The cycling test was performed and the distance, calories burned and heart rate read from the counter were verified computationally.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 1025-1032
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of additional foil wraps on the tightness of the packaging of bales
    Autorzy:
    Stępniewski, A. A.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/972941.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    baled silage
    cylindrical bale
    stretch film
    tightness
    mathematical model
    simulation model
    Opis:
    The work analyzed the effect of additional wraps on the number of layers and thus the tightness of the material under protection. It was assumed that all the overlaps of each two consecutive wraps are the same, and each additional wrap causes the same increase of all the tabs. The mechanical properties of the film and its dimensions were taken into account. We have written our own simulation program that allows us to calculate the percentage of a given number of film layers on the side of the bale and the visualization of the distribution of layers in its cross-section. Calculation examples have been provided. Conclusions and suggestions resulting from the obtained simulation results have been formulated.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 1; 145-150
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of additional foil wraps on the tightness of the packaging of bales
    Autorzy:
    Stępniewski, A. A.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/972982.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    baled silage
    cylindrical bale
    stretch film
    tightness
    mathematical model
    simulation model
    Opis:
    The work analyzed the effect of additional wraps on the number of layers and thus the tightness of the material under protection. It was assumed that all the overlaps of each two consecutive wraps are the same, and each additional wrap causes the same increase of all the tabs. The mechanical properties of the film and its dimensions were taken into account. We have written our own simulation program that allows us to calculate the percentage of a given number of film layers on the side of the bale and the visualization of the distribution of layers in its cross-section. Calculation examples have been provided. Conclusions and suggestions resulting from the obtained simulation results have been formulated.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2018, 7, 1; 145-150
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The analysis of pedaling techniques with platform pedals
    Autorzy:
    Stępniewski, A. A.
    Grudziński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/955232.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    rower
    pedałowanie
    wał korbowy
    cycling
    platform pedal
    pedaling
    cycling efficiency
    Opis:
    The paper analyzes a pedaling technique with platform pedals in which the influence of the geometric and tribological parameters on the torque course of the active forces in the crank rotation axis is determined. Distribution of forces of feet acting on pedals as a function of the crank rotation angle was performed and on this basis the specific pedaling zones and their ranges and the courses of the value of variable active torque and pedaling work during the full cycle were determined. The course of changes in the movements in the ankle joint is described with a function depending on the crank and limb position and loading of the joint. A numerical example has also been presented and a discussion of the results has been carried out.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 3; 633-642
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the mathematical modelling and optimization of foil consumption for cylindrical bale wrapping
    Autorzy:
    Stankiewicz, A.
    Stępniewski, A. A.
    Nowak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/411265.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    baled silage
    cylindrical bale
    mathematical model
    stretch foil consumption
    optimization
    Opis:
    Aspects of mathematical modelling of wrapping round (i.e. cylindrical) bale related to the optimization of foil consumption are considered for individual bales of agricultural materials wrapped in plastic foil. The article details the mathematical description of bale wrapping, while also identifying both some solved problems and a few open ones, which can be solved to optimize the foil consumption. Mechanical properties of the sealing foil characterized by its Poisson ratio, arbitrary foil and bale size dimensions and overlapping width of subsequent wrapped foil strips were taken into account. After providing a basic understanding of how the foil is consumed in the course of wrapping process, the mathematical model for determining the number of entire foil wrappings is determined. Next the results of mathematical analysis are used for optimization purposes. The foil consumption per unit of the bale volume index is used as a measure of foil expenditure. Two problems of foil consumption optimization are stated and solved. The formulas for computing the optimal foil width and optimal bale size dimensions are derived and estimations of the solution errors are given. Computational results are presented and analyzed for exemplary bale silage.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 3; 101-110
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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