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    Wyświetlanie 1-5 z 5
    Tytuł:
    Vibration analysis and modelling of light-weight robot arms
    Autorzy:
    Leniowski, Ryszard
    Wroński, Michał
    Powiązania:
    https://bibliotekanauki.pl/articles/2202421.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    flexible deformation
    vibration analysis
    light-weight robots
    odkształcenie elastyczne
    analiza drgań
    lekkie roboty
    Opis:
    Lightweight robots (LWR) are a new generation of devices intended to be used not only for industrial tasks but also to perform actions in the human environment. This work presents an analysis of selected basic problems related to the vibration properties of light-weight robot arms. The study of vibration is based on the analysis of the root locus on the plane of complex variables. It turns out that their distribution is non-stationary and depends on the parameters of the model (arm geometry, material parameters), but also depends on the type of realised motion, which is not so obvious. Depending on the manoeuvres conducted (acceleration / deceleration), the system may lose (or increase) its oscillating properties at higher frequencies, as well as introduce a structural (measurable) delay. Recognition of the discussed properties along with their modelling is an important element of the design process of the control system of modern, light-weight robots.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 2; art. no. 2022220
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of isogeometric approach to dynamics of curved beam
    Autorzy:
    Łasecka-Plura, Magdalena
    Białasik, Jan
    Kuczma, Mieczysław
    Tabrizikahou, Alireza
    Powiązania:
    https://bibliotekanauki.pl/articles/24201980.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    isogeometric analysis
    free-form curved beam
    Timoshenko beam theory
    vibration analysis
    analiza izogeometryczna
    belka zakrzywiona
    teoria Timoshenki
    analiza drgań
    Opis:
    In the paper dynamics of a free-form Timoshenko curved beam is investigated. The considered problem is solved using isogeometric analysis. Non-uniform rational B-spline (NURBS) basis functions are applied to describe both geometry and displacement field of the considered beam. The Timoshenko beam theory is used to derive the element stiffness and mass matrices. The application of the presented method is shown in numerical examples. The correctness of the presented approach is proved by comparing the obtained results to those available in the literature and calculated by the finite element method. Analysis of convergence is presented for different orders of NURBS basis functions.
    Źródło:
    Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023117
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computational modelling of vibrations transmission loss of auxetic lattice structure
    Autorzy:
    Idczak, E.
    Stręk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/127808.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    auxetics
    negative Poisson's ratio
    dynamic analysis
    VTL factor
    auksetyki
    ujemny współczynnik Poissona
    analiza dynamiczna
    współczynnik utraty przewodzenia drgań
    Opis:
    In this article dynamical properties of auxetic lattice structures will be analysed. Auxetic structures are materials, which have negative Poisson’s ratio and some of these have got specific dynamic properties. Their dynamic behaviour in the frequency domain will be also shown in this article. The possibility of isolation of auxetics will show the factor VTL – Vibration Transmission Loss.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 123-128
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic analysis of optimized two-phase auxetic structure
    Autorzy:
    Idczak, E.
    Stręk, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/127856.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    negative Poisson's ratio
    auxetics
    eigenfrequency
    topology optimization
    dynamic analysis
    ujemny współczynnik Poissona
    auksetyki
    częstotliwość drgań własnych
    optymalizacja topologiczna
    analiza dynamiczna
    Opis:
    This paper presents a dynamic analysis of earlier optimized auxetic structure. This optimization based on the distribution of two materials in such way to obtain a minimal value of Poisson’s ratio (PR), which indicates the auxetic properties. The initial optimized shape was so-called star structure, which if is made from one material has the PR close to 0.188. After optimization with the goal function of PR-minimization, the obtained value was equal to -9.5043. Then the eigenfrequencies for the optimized structure were investigated. The calculations were carried out by means of Finite Element Method (FEM). For optimization of the value of Poisson’s ratio was used algorithm MMA (Method of Moving Asymptotes). The computing of single material properties (PR, Young’s modulus, density) for the whole shape was made by means of SIMP method (Solid Isotropic Method with Penalization).
    Źródło:
    Vibrations in Physical Systems; 2017, 28; 1-12
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Paradigm for natural frequency of an un-cracked simply supported beam and its application to single-edged and multi-edged cracked beam
    Autorzy:
    Khalkar, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/128309.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    paradigm
    natural frequency
    simply supported beam
    ANSYS
    modal analysis
    zero frequency deflection
    condition monitoring
    paradygmat
    częstotliwość drgań własnych
    belka swobodnie podparta
    analiza modalna
    ugięcie zerowe
    monitorowanie stanu technicznego
    Opis:
    In this research paper, a theoretical method of analysis of the first natural frequency of an un-cracked simply supported beam in bending mode is presented. The formula of a paradigm is used to determine the natural frequency of an un-cracked beam. The converged natural frequency formula of a paradigm is then extended to a single edged and multi-edged cracked simply supported beam to evaluate their natural frequency. The main attraction of the proposed method is that it gives one more significant way to the researchers to determine the natural frequency of cracked beams. The limited fatigue strength, defects like corrosion, corrosion-erosion, and corrosion fatigue in the beam are the main causes of formation of edged cracks in beams. Hence the evaluation of natural frequency of cracked beams and its use in the inverse problem is of utmost importance to do the condition monitoring of the structures by the vibration methods.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-12
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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