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    Wyświetlanie 1-9 z 9
    Tytuł:
    Harvesting mechanical vibrations energy using nonlinear electromagnetic minigenerators - a survey of concepts and problems
    Autorzy:
    Kulik, M.
    Jagieła, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/376373.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    energy harvesting
    nonlinear resonance
    bistability
    electromagnetic induction
    Opis:
    The state of knowledge in the field of conversion of energy of mechanical vibrations into electrical energy using nonlinear electromagnetic generators is presented. The principle of operation of the considered converters is based on the Faraday law. The electromotive force is induced by the relative movement of the coil or permanent magnets under impact of externally applied vibrations. In order to diminish the disadvantages of conventional generators, namely the narrow frequency bandwidth, in recent years the nonlinear systems were introduced that exhibit the nonlinear resonance phenomenon. Broadening the frequency bandwidth, in which the power generated by the system is relatively high, is realized via introduction of nonlinear force into system kinematics. Designing such systems becomes a big challenge. Based on thorough survey of recent publications as well as on own expertise in the field, the work compares a few concepts of nonlinear electromechanical minigenerators in term of their functional characteristics and design problems. Sample calculations of frequency characteristics using time- and frequency-domain models are presented.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 90; 347-358
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Area of the unstable solution of rolling equation : jumps of the oscillations amplitude
    Autorzy:
    Wawrzyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/246425.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    ship rolling
    nonlinear oscillations
    nonlinear resonance
    bistability
    bifurcations
    amplitude jumps
    Opis:
    The most interesting motion of the ship is rolling. This is because the rolling amplitudes are much bigger than amplitudes of other degrees of freedom and under resonance conditions, which can exceed 40º. In such a case, when the maximum of the righting arm curve is placed at relatively small angles, the roll equation reveals a strongly nonlinear character and bistability areas as well as an area of unstable solutions of the roll equation occurs. Together with the appearance of the above-mentioned areas, amplitude jumps are possible. In the study, the case of strongly nonlinear rolling is analysed. For the purpose of numerical simulations, the 1DOF mathematical model of rolling with damping dependent on amplitude and frequency is used. The article presents the roll spectrum including the bistability areas and the area of unstable solutions for one loading condition of the offshore support vessel. It is demonstrated that for strongly nonlinear rolling, rolling with two different amplitudes for the same value of excitation is possible. It is also shown that transitions (jumps) between these amplitudes are possible too. A few scenarios of jumps of the rolling amplitude within the region of unstable solutions of the rolling equation are presented. The presented rolling scenarios show that under some circumstances rolling can be observed as chaotic.
    Źródło:
    Journal of KONES; 2018, 25, 3; 489-496
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of the primary and superharmonic contact resonances – Part 2
    Autorzy:
    Kostek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/279878.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear contact
    vibrations
    superharmonic resonance
    multistability
    Opis:
    This paper presents results of investigations of non-linear normal contact microvibrations excited by a harmonic force in a system of two bodies in planar contact. The system models, for instance, slide units of machine tools or their positioning systems. The main aim of the computational analysis is to present resonance graphs and time histories obtained with numerical and perturbation methods. Good agreement between the perturbation and numerical results leads to the conclusion that the perturbation solution is correct. The obtained perturbation solution describes well both the primary resonance and the superharmonic resonances. Characteristic phenomena typical for non-linear vibrations are depicted, viz. asymmetry of vibrations, multi-harmonic vibrations, non-elliptical phase portraits, loss of contacts, bending resonance peaks, bi-stabilities, and multi-stability.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 687-696
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the primary and superharmonic contact resonances – Part 1.
    Analiza rezonansu kontaktowego głównego oraz rezonansów ultraharmonicznych – Część 1
    Autorzy:
    Kostek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/280998.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear contact
    vibrations
    superharmonic resonance
    multistability
    Opis:
    This paper presents results of numerical and analytical investigations of non-linear normal contact microvibrations excited by a harmonic force in a system of two bodies in planar contact. The system models, for example, the slide unit of machine tools or positioning systems. The main aim of the computational analysis is to present the evolution of the resonance phenomena under various amplitudes of the excitation force. The studies show that, beside the primary resonance, a number of superharmonic resonances appear, which take place in the single-degree-of-freedom non-linear system excited by a harmonic force. Thus, in a resonance plot, a number of peaks is observed. The superharmonic (ultraharmonic) resonances take place at excitation frequencies being below the natural frequency, and becoming stronger with the increase of the excitation amplitude. The resonances are coupled with complex non-linear phenomena like: asymmetry of vibrations, bending resonance peak, bi-stability, multi-stability and loss of contact, which are presented and described in this paper.
    W artykule tym przedstawiono wyniki badań numerycznych oraz analitycznych drgań kontaktowych normalnych. Drgania te zostały wzbudzone przez silę harmoniczną w układzie składającym się z dwóch ciał, które tworzą parę cierną. Głównym celem pracy było zbadanie zmian rezonansów kontaktowych pod wpływem wzrostu amplitudy wymuszenia. Oprócz rezonansu głównego zaobserwowano także rezonanse ultraharmoniczne, które są wzbudzane dla częstotliwości będących poniżej częstotliwości własnej układu. Amplituda rezonansów ultraharmonicznych staje się stopniowo większa wraz ze wzrostem amplitudy wymuszenia. Ponadto zaobserwowano asymetrię drgań kontaktowych, odrywanie się ciał od siebie, wiele atraktorów dla takiego samego wzbudzenia oraz zaginanie się pików rezonansowych. Wymienione zjawiska zaobserwowano dla nieliniowego układu o jednym stopniu swobody.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 2; 475-486
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of the primary and superharmonic contact resonances – Part 3
    Autorzy:
    Kostek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/279972.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    nonlinear contact
    vibrations
    superharmonic resonance
    multistability
    bifurcation
    Opis:
    This paper presents a study of non-linear normal contact vibrations excited by an external harmonic force in a system containing two bodies being in planar contact. The system models, for instance, the slide unit of machine tools or positioning systems. The presented results, which are obtained both with numerical and perturbation methods, show clearly the evolution of resonance phenomena under various excitation amplitudes. Apart from the primary resonance, a number of super-harmonic resonances has been excited in the nonlinear single-degree-of-freedomsystem. Hence, a resonance graph contains a number of peaks being below the natural frequency. The contact vibrations are associated with strongly nonlinear phenomena like: asymmetry of vibrations, loss of contact, bending resonance peak, multi-stability, period-doubling bifurcations, chaotic vibrations, which are far from linear dynamics. These phenomena are presented and described in this article.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 799-812
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear vibrations of rotating system near resonance
    Autorzy:
    Starosta, R.
    Sypniewska-Kamińska, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/128157.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    nonlinear vibrations
    asymptotic methods
    resonance
    drgania nieliniowe
    metoda asymptotyczna
    rezonans
    Opis:
    The paper concerns analysis of nonlinear vibration of the rotating system consisted of two disks and shaft. The analytical multiple time scale method is applied to the analysis dynamics of the system near main resonance. The transition phenomenon depending on the value of the nonlinearity parameter is discussed. All the analytical results have been confirmed numerically.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 265-272
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of some speed parameters on the dynamics of nonlinear flexural vibrations of a drill column
    Autorzy:
    Pukach, P.
    Kuzio, I.
    Nytrebych, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/410646.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Oddział w Lublinie PAN
    Tematy:
    nonlinear elastic properties
    mathematical model
    Galerkin method
    Van der Pol method
    resonance
    Opis:
    We investigate the influence of the motion of fluid flushing the cutter of a well drilling column, and the angular rotational velocity upon dynamic characteristics of its flexural vibrations. We take into account the nonlinear elastic features of column material. As a base of the research we took the Galerkin method and the Van der Pol method. Combining those two methods made possible to obtain the relations describing the main parameters of the dynamical process In both nonresonance and resonance case.
    Źródło:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 4; 61-66
    2084-5715
    Pojawia się w:
    ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Second Generation Intact Stability Criteria: on the validation of codes for direct stability assessment in the framework of an example application
    Autorzy:
    Bulian, G.
    Francescutto, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/260465.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    large amplitude ship motions
    second generation intact stability criteria
    nonlinear roll
    sub-harmonic resonance
    validation
    Opis:
    The Sub-Committee on Stability and Load Lines and on Fishing Vessels Safety (SLF) of the International Maritime Organization (IMO) has undertaken the development of so-called “Second Generation Intact Stability Criteria” (SGISC) with the intention of providing a new set of rules covering those phenomena which are not properly covered by present, mostly semi-empirical, requirements. The first two levels of the envisioned 3+1 tiers structure of SGISC are so-called “vulnerability assessment” levels: most of the discussion has so far been dedicated to these levels. At the highest level there is the so-called “Direct Stability Assessment”, which is also strictly linked with the development of ship-specific “Operational Guidance”. Recent discussion on the topic of “Direct Stability Assessment” (DSA) has touched the issue of “validation” of numerical codes to be employed at this level. Stimulated by, and in view of, the ongoing IMO discussion, this paper presents the results of a recent series of experiments in beam waves (mono-/bichromatic, irregular) and associated simulations based on a 6-DOF blended code. Nonlinear harmonic and sub-harmonic resonances are observed and simulated.
    Źródło:
    Polish Maritime Research; 2013, 4; 52-61
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear dynamic phenomena in fixed and rotating mechanical structures
    Autorzy:
    Warmiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/127654.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    nonlinear vibrations
    rotating structures
    resonance
    saturation control
    composite beams
    drgania nieliniowe
    struktury wirujące
    rezonans
    kontrola saturacji
    belka kompozytowa
    Opis:
    A review of selected nonlinear phenomena which may occur in fixed or rotating structures has been presented in the paper. At first, a self, parametrically and externally exited oscillator with added time delay control has been studied. It has been shown that the interaction between different vibration types may produce an untypical resonance curve, with five solutions occurring, observed by an internal resonance loop. The existence of the loop may be controlled by adding a time delay input signal. A proper selection of the time delay may reduce the loop or eliminate it totally. In the second problem a rotating hub-beam structure has been studied. The blade, apart from passive layers, has been composed of two active PZT layers which enabled active vibration control. A nonlinear coupling of the structure (plant) and the controller resulted in the so called saturation phenomenon which has been effectively used for the vibration reduction.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-6
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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