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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dynamics of an inertially driven robot
    Autorzy:
    Fritzkowski, P.
    Starosta, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/127744.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    motion control
    movable internal mass
    vibration-driven robot
    sterowanie ruchem
    ruchoma masa wewnętrzna
    Opis:
    An inertially-driven system that slides on a rough horizontal plane due to periodic oscillations of two internal bodies is studied. Three-phase internal motions with piecewise-constant relative accelerations are considered. It is shown that an always forward motion of the robot can be achieved. The effect of the model parameters on the displacement and average velocity of the system is analyzed.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-9
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy analysis of a mechanical system with a dynamic vibration absorber
    Autorzy:
    Dobry, M. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/128266.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    energy flow
    dynamics of machines
    elimination of energy flow
    przepływ energii
    dynamika maszyn
    eliminacja przepływu energii
    Opis:
    The study relates to the phenomenon of power distribution in mechanical systems equipped with a dynamic vibration absorber. It is one of the methods of eliminating vibrations in a mechanical system, which stabilises its operation. This solution helps to reduce dynamic stress in subsystems of a vehicle's suspension or stabilise the motion of flying machines, such as helicopters. The article describes the phenomenon of power distribution of structural forces, which has not been described so far. The phenomenon reveals the power distribution in a dynamic structure of a system of interest and can be used to determine the rate of energy flow as a function of the dynamic state resulting from the selection of dynamic parameters of the vibration absorber. The energy analysis applied in the study is based on an energy-based optimization method of adjusting the dynamic vibration absorber to the main mechanical system without changing its dynamic parameters, as is the case, for example, in turbine rotor balancing.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 83-90
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning task-based motions of multi-link manipulator models prone to vibration
    Autorzy:
    Jarzębowska, E.
    Augustynek, K.
    Urbaś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/127759.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    dynamics
    GPME algorithm
    manipulator
    LuGre friction model
    dynamika
    algorytm GPME
    model tarcia LuGre
    Opis:
    A new method of designing tip-point trajectories for industrial manipulators with structural flexibility and friction in their supports and joints is presented in the paper. The method is based upon the formulation of the reference dynamics model of the manipulator model. The reference dynamics models are derived off-line for desired trajectories, i.e. trajectory patterns are delivered in constraint equation forms. A library of reference dynamics models can be generated off-line and serve for verification of desired motions feasibility, ability of reaching required velocities and accelerations in order to obtain the desired trajectories, and estimate power needed for desired motions execution. It enables off-line tests of a system model behavior when it moves a desired trajectory. Also, the reference dynamics enables verification of vibrations that may accompany desired motions, since at the stage of defining a desired trajectory, e.g. for performing a servicing task, a system behavior is unknown. The paper is dedicated to reference dynamics analysis, for a multi-link manipulator model, for which friction in joints is modeled by the LuGre model, the manipulator links are rigid but light and prone to vibrations. The results of the reference dynamics analysis are presented in a series of simulation studies.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-9
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of rotor vibration by using full spectra from shaft mounted piezoelectric patches
    Autorzy:
    Kozioł, Mateusz
    Cupiał, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/128134.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    rotor dynamics
    piezoelectric patches
    frequency spectrum
    signal processing
    diagnostics
    dynamika wirników
    czujniki piezoelektryczne
    widmo częstotliwości
    przetwarzanie sygnałów
    diagnostyka
    Opis:
    The work considers the applicability of signals coming from rotor-mounted sensors in machine diagnostics. In the experiments, such sensors were implemented by piezoelectric patches bonded to the surface of a shaft. The laboratory stand also included more common sensors: laser sensors that measured the displacement of the central disc, as well as accelerometers mounted on the supports. The signals measured are analysed using the so-called full FFT method and the spectra are compared. The results show that the signals from piezoelectric sensors can be processed so that their spectral content is similar to typical spectra obtained using stator-mounted sensors.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 2; 1-8
    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
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