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    Wyświetlanie 1-3 z 3
    Tytuł:
    Force ratio in masticatory muscles after total replacement of the temporomandibular joint
    Autorzy:
    Vilimek, M.
    Horak, Z.
    Baca, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/307085.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dynamika odwrotna
    optymalizacja statyczna
    staw skroniowo-żuchwowy
    siły mięśniowe
    inverse dynamics
    static optimization
    temporomandibular joint
    muscle forces
    mastication
    FE analyses
    Opis:
    The temporomandibular (TM) joint is one of the most active joints in the human body, and any defect in this joint has a significant impact on the quality of life. The objective of this study was to analyze changes in the force ratio after TM joint replacement on contralateral TM joint loading. Implantation of an artificial TM joint often requires removal of 3 of the 4 masticatory muscles (activators). In order to perform true loading of the TM joint, loading during mastication was investigated. Input kinematic variables and mastication force were experimentally examined. The inverse dynamics approach and static optimization technique were used for solution of the redundant mechanism. Muscle forces, and reactions in the TM joint were calculated. We modified the model for several different tasks. The m. temporalis and m. masseter were removed individually and together and the forces of mastication on the TM joint were calculated for each variation. To evaluate the results, a parametric numerical FE analysis was created to compare the magnitude of the TM joint loading during the bite process for four different muscle resections. The results show an influence relative to the extent of muscle resection on contralateral TM joint loading in a total TM joint replacement. The biggest increase in the loading magnitude on the contralateral TM joint is most evident after m. masseter and m. temporalis resection. The results from all simulations support our hypothesis that the greater the extent of muscle resection the greater the magnitude of contralateral TM joint overloading.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2016, 18, 3; 131-136
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static optimisation of mechanical systems based on the method of extremal regulation
    Autorzy:
    Homišin, Jaroslav
    Powiązania:
    https://bibliotekanauki.pl/articles/197087.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    static optimisation
    mechanical systems
    method of extremal regulation
    continuous tuning of mechanical systems
    optymalizacja statyczna
    systemy mechaniczne
    metoda ekstremalnej regulacji
    ciągłe dostrajanie układów mechanicznych
    Opis:
    A change in torsional stiffness of pneumatic tuners can be achieved by changing the pressure of the gaseous medium in the course of the mechanical systems' operation or while idle. Based on this statement, we tuned mechanical systems with torsional vibration when they are either idle or when they reach stable condition during operation. The principle of tuning mechanical systems with torsional vibration during operation when their condition is stable lies in the appropriate adaptation of basic dynamic properties (dynamic torsional stiffness and damping factor) of the pneumatic tuner to the dynamics of the system. This was achieved with a control system that helps create a closed control feedback loop. In this way, we can continuously change, that is, adapt the dynamic properties of the pneumatic tuner to the dynamics of the mechanical system so that no dangerous torsional vibrations occur while the system is in operation mode.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2019, 103; 12-29
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design optimization for the weight reduction of 2-cylinder reciprocating compressor crankshaft
    Autorzy:
    Arshad, Ali
    Cong, Pengbo
    Elsayed Elmenshawy, Adham Ahmed Awad
    Blumbergs, Ilmārs
    Powiązania:
    https://bibliotekanauki.pl/articles/1845022.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    reciprocating compressor
    crankshaft optimization
    weight reduction
    topology optimization
    stress
    distribution
    crank web
    lightweight crankshaft design
    crack modeling
    static structural analysis
    modal analysis
    sprężarka tłokowa
    optymalizacja wału korbowego
    redukcja wagi
    optymalizacja topologii
    naprężenie
    dystrybucja
    wstęga korby
    lekka konstrukcja wału korbowego
    modelowanie pęknięć
    statyczna analiza konstrukcji
    analiza modalna
    Opis:
    This study aims to optimize the 2-cylinder in-line reciprocating compressor crankshaft. As the crankshaft is considered the "bulkiest" component of the reciprocating compressor, its weight reduction is the focus of current research for improved performance and lower cost. Therefore, achieving a lightweight crankshaft without compromising the mechanical properties is the core objective of this study. Computational analysis for the crankshaft design optimization was performed in the following steps: kinematic analysis, static analysis, fatigue analysis, topology analysis, and dynamic modal analysis. Material retention by employing topology optimization resulted in a significant amount of weight reduction. A weight reduction of approximately 13% of the original crankshaft was achieved. At the same time, design optimization results demonstrate improvement in the mechanical properties due to better stress concentration and distribution on the crankshaft. In addition, material retention would also contribute to the material cost reduction of the crankshaft. The exact 3D model of the optimized crankshaft with complete design features is the main outcome of this research. The optimization and stress analysis methodology developed in this study can be used in broader fields such as reciprocating compressors/engines, structures, piping, and aerospace industries.
    Źródło:
    Archive of Mechanical Engineering; 2021, LXVIII, 4; 449-471
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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