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Wyszukujesz frazę "vibration analysis" wg kryterium: Temat

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    Wyświetlanie 1-9 z 9
    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:
    Vibration condition monitoring of the vertical steel tanks
    Autorzy:
    Bouraou, N.
    Lukianchenko, O.
    Tsybulnik, S.
    Shevchuk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/127953.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    vertical steel tank
    numerical analysis
    stress
    deformation
    vibration analysis
    damping factor
    zbiornik stalowy pionowy
    analiza numeryczna
    naprężenie
    deformacje
    analiza wibracji
    współczynnik tłumienia
    Opis:
    This paper presents the results of numerical analysis and physical simulation of the vertical steel tank for usage in the vibration condition monitoring system. For purposes of the numerical analysis the tank is considered as the double steel cylinder consisting of the inner and outside shells. The discrete model of a tank is developed. The estimations of stress and deformation are obtained when the following vertical loads are exerting: weight of the fuel, weight of the tank roof and other structural elements or equipment. The physical model of a tank is used for physical simulation. The impulse responses of this model are measured and analyzed for different levels of tank filling. The methods of Prony and Steiglitz-McBride are used for estimation of the vibration damping factor which depends on the level of tank filling.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 55-60
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the wavelet multifractal analysis of vibration signal for rotating machinery diagnosis
    Autorzy:
    Puchalski, Andrzej
    Komorska, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/128185.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    rotating machines
    multifractal analysis of vibration signal
    maszyny wirujące
    analiza multifraktalna sygnału drganiowego
    Opis:
    The paper proposes the WLMF (Wavelet Leaders Multifractal Formalism) method enabling the adoption of multifractal parameters mapped by vibration signal log-cumulants as diagnostic features, in the procedure of automatic classification of assembly errors and wear of demonstration gearbox. In the analysis of vibration time signals, initially, a multifractal formalism was used based on the study of time series local regularity, which is measured by Holder exponents. The presented test results relate to time-frequency multifractal analysis, the starting point of which was a continuous wavelet transform. Discrete wavelet transform allowed for much better grounded multifractal formalism and more accurate estimation of multifractal parameters using wavelet leaders, which are determined based on wavelet coefficients and are representatives of Holder exponents.
    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:
    Comparison of selected point estimators of vibration signals for purposes of fault detection in rolling bearings
    Autorzy:
    Krol, Adrian
    Fidali, Marek
    Jamrozik, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2146576.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    vibration
    analysis
    bearings
    defects
    diagnosis
    drgania
    analiza
    łożyska
    uszkodzenia
    diagnoza
    Opis:
    Most of machine breakdowns relate to bearing failures thus it is very important to diagnose bearing conditions. The main purpose of the study was to classify the condition of bearings and identify defective ones based on visual inspection and the values of classic parameters of the acceleration signal vibration, such as Peak, RMS, Kurtosis. The results were compared to parameters provided by the SPM method. All vibration parameters were estimated for high pass filtered signals where filters had following cut-off frequencies 0.5; 1, 2, 5 and 8 kHz. Bearings were tested on the laboratory test bench being built at the Silesian University of Technology. Based on the signal analysis and visual inspections it can be stated that there is agreement in the assessment of the conditions between the parameters of the SPM method and the Peak and RMS parameters. It was observed that the sensitivity to the existence of low-intensity defects increases when the vibration parameters are determined for signals in the band above 2kHz.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020212
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of structural damage of technical objects with the use of multidimensional analysis
    Autorzy:
    Mikołajczak, Paweł
    Mikołajczak, Jan
    Werzbicki, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/2146614.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    multidimensional analysis
    vibration
    wheel rim
    resonant frequency
    analiza wielowymiarowa
    drgania
    wieniec koła
    częstotliwość rezonansowa
    Opis:
    The paper presents a damage identification method of technical objects with the use of multidimensional analyses. The studied objects were rolling bearings tested on a laboratory test stand as well as vehicle wheel rims. The rims were examined by an Automated Tester. A group of variables describing the condition of the bearings included basic parameters of acceleration signal such as: RMS, peak value, functions describing the envelope of vibration spectrum and additionally the experimental coefficient of friction for the oscillatory motion. Diagnostic measurements data can be input into the proposed mathematical models and compared with a database of cases of the object technical states. Results of the multidimensional analysis of diagnostic parameters are presented in the form of diagrams (cluster trees). On this basis, the technical condition of the tested object can be easily interpreted. The proposed models supported the classification of wheel rims into groups characterized by similar frequencies and amplitude based on shock tests.
    Źródło:
    Vibrations in Physical Systems; 2021, 32, 2; art. no. 2021211
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Short time vibration analysis and parameterisation as a tool for machine prototypes testing
    Autorzy:
    Barczewski, Roman
    Powiązania:
    https://bibliotekanauki.pl/articles/2146636.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    machine vibration
    non-stationarity identification
    short time signal analysis
    drgania maszyn
    identyfikacja niestacjonarności
    krótkoczasowa analiza sygnału
    Opis:
    The paper outlines the idea of using the short-time vibration signal processing for testing machines of a complex design, particularly the machines consisting of many subassemblies with a non-stationary (e.g. cyclic) operation modes. The method presented consists in graphic representation of vibrations of subassemblies in the form of a trace on a plane. It is created by associating instantaneous rms values of vibration acceleration and instantaneous Rice frequency values obtained as a result of short-time signal processing. On the basis of the shape, orientation of the created trajectory and / or dispersion / concentration of points on the Rf - arms plane, the type of non-stationarity of generated vibrations can be identified. The presented methodology can be used for testing machine prototypes. The results in the proposed form can be helpful to determine the type of vibration reduction systems for individual machine subassemblies. It is also possible to detect subassemblies for which an increase in machine capacity results in an increase in the level of generated vibrations. The location of the averaged values of measures obtained for a new machine on the Rf - arms plane can be a reference point for further monitoring of machine vibration and for detection of damage or malfunction of its subassemblies.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 1; art. no. 2020112
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The modelling method of discrete-continuous systems
    Autorzy:
    Hein, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/128231.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    modelling
    model reduction
    modal analysis
    mechanical system
    dynamic systems
    vibration
    modelowanie
    redukcja modelu
    analiza modalna
    układ mechaniczny
    układy dynamiczne
    drgania
    Opis:
    The paper introduces a method of discrete-continuous systems modelling. In the proposed method a threedimensional system is divided into finite elements in only two directions, with the third direction remaining continuous. The thus obtained discrete-continuous model is described by a set of partial differential equations. General difference equations of discrete system are obtained using the rigid finite element method. The limit of these equations leads to partial differential equations. The derived equations, expressed in matrix form, allow for the creation of a global matrix for the whole system. The equations are solved using the distributed transfer function method. Proposed approach is illustrated with the example of a simple beam fixed at both ends.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 87-92
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of the vibration diagnostics of rotation shaft damage based on fractal analysis
    Autorzy:
    Bouraou, N.
    Pavlovskyi, O.
    Pazdrii, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/128311.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    gas-turbine engine
    cracked shaft
    vibration diagnosis
    fractal analysis
    Hurst exponent
    silniki gazo-turbinowe
    pęknięcie wału
    diagnostyka wibracyjna
    analiza fraktalna
    wykładnik Hursta
    Opis:
    This work is devoted to further research and improvement of the vibration diagnostics of the initial crack-like damage of rotation shaft in aviation gas-turbine engines (GTE). We propose to use fractal analysis of the accelerating shaft response in order to increase the damage detection efficiency. Responses of the accelerating shaft are derived by using simulation in absence and in presence of the initial traverse crack. The responses of the cracked shaft have sub-critical peaks; the increase in size of a crack leads to the increase in peak values of the vibration amplitude in the range of sub-harmonic resonances. The Hurst exponent is obtained for the time series in the range of sub-harmonic resonances. The research shows that a small change in the crack size results in considerable change of the Hurst exponent, which allows to detect the mentioned sub-harmonic resonances of the measured signal in order to identify the initial crack-like damage of the rotation shaft.
    Źródło:
    Vibrations in Physical Systems; 2016, 27; 61-66
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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