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Wyszukujesz frazę "four-bar linkage" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Reduced number of design parameters in optimum path synthesis with timing of four-bar linkage
Autorzy:
Buśkiewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/279257.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
path synthesis
evolutionary algorithm
four-bar linkage
Opis:
The paper presents the method for the optimal synthesis of four-link mechanism generating open/closed paths with time prescription. Although the method is suitable for both closed and open paths, it enables decreasing the number of design parameters describing dimensions, orientation and position of a path generator. Compared to the methods presented in the references, this is a one-phase synthesis method; although the number of design parameters is reduced, the method does not require affine transformations to be performed on the synthesised mechanism. The effectiveness of the method is discussed based on examples of three paths, with two taken from the literature.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 43-55
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinematic analysis of instantaneous centre of rotation of prosthetic knee mechanisms
Autorzy:
Grodzka, Kinga
Sajewicz, Eugeniusz
Dziemianowicz, Marcin
Powiązania:
https://bibliotekanauki.pl/chapters/2215322.pdf
Data publikacji:
2022
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
knee prosthesis
instantaneous center of rotation
four-bar linkage
Opis:
The purpose of this work was to determine the influence of kinematic evidence, based on the trajectories of the instantaneous center of rotation (ICR) on the optimization of the functionality of selected prosthetic knee mechanisms. For the research 11 commercially used knees based on the articulated quadrilateral mechanism were used to visualize the operation of mechanisms with two methods: analytical and graphic. The generated paths were compared in terms of position changeability and shape. It was found that depending on the position of the ICR related to the axes of the mechanism, prosthetic knees obtained different level of stability and energy expenditure. The results have also shown that ICR point position and shapes of its trajectories are variable for particular classes of mechanisms. An analysis of the obtained results suggests that manipulation of the position of the instantaneous center of rotation by a suitable design of the linkages length of the mechanism enable to achieve the desired features, corresponding to the real needs of patients.
Źródło:
Advances in biomedical engineering; 55-70
9788367185400
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The description of the human knee as four-bar linkage
Autorzy:
Dathe, H.
Gezzi, R.
Fiedler, Ch.
Kubein-Meesenburg, D.
Nägerl, H.
Powiązania:
https://bibliotekanauki.pl/articles/307351.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
staw kolanowy
anatomia
kinematyka kolana
human knee
anatomy
knee kinematics
four-bar linkage
analytical description
Opis:
Purpose: We investigate the dependence of the kinematics of the human knee on its anatomy. The idea of describing the kinematics of the knee in the sagittal plane using four-bar linkage is almost as old as kinematics as an independent discipline. We start with a comparison of known four-bar linkage constructions. We then focus on the model by H. Nägerl which is applicable under form closure. Methods: We use geometry and analysis as the mathematical methods. The relevant geometrical parameters of the knee will be determined on the basis of the dimensions of the four-bar linkage. This leads to a system of nonlinear equations. Results: The four-bar linkage will be calculated from the limits of the constructively accessible parameters by means of a quadratic approximation. Conclusions: By adapting these requirements to the dimensions of the human knee, it will be possible to obtain valuable indications for the design of an endoprosthesis which imitates the kinematics of the natural knee.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 4; 107-115
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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