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    Wyświetlanie 1-9 z 9
    Tytuł:
    Parameters identification of Bodner-Partom model for fluid in MR damper
    Autorzy:
    Skalski, P.
    Woźnica, K.
    Bajkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/387208.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    dynamika
    tłumik magnetoreologiczny
    dynamika amortyzatora
    dynamic
    damper dynamics
    magnetorheological damper
    damper
    Opis:
    This paper presents an approach to describe a dynamic behaviour of magnetorheological damper by the Bodner-Partom constitutive law. The B-P equations usually used for metals are presented for shear stresses to express viscoplastic proprieties of MR fluid. Material parameters for the B-P law for fluid in the LORD RD 1005-3 damper are determined. Experimental results are compared with numerical results.
    Źródło:
    Acta Mechanica et Automatica; 2009, 3, 4; 62-64
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    O wpływie zużycia na dynamikę tłumika drgań
    On the wear influence on a damper dynamics
    Autorzy:
    Awrejcewicz, J.
    Fyrev, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/386610.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    analiza matematyczna
    model matematyczny
    tarcie
    tłumienie drgań
    mathematical model
    mathematical analysis
    vibration damping
    damper dynamics
    Opis:
    W pracy zaproponowano i dokonano analizy modelu matematycznego dynamicznego tłumika drgań z tarciem suchym z uwzględnieniem zjawiska zużycia materiału trących się, ciał. W szczególności oszacowano wpływ parametrów zużycia na charakter ruchu okresowego badanego układu w oparciu o rozwiązania analityczne i symulacje numeryczne.
    A novel mathematical model of a dynamic vibration damper taking into account wear of contacting bodies is proposed and studied. Both analytical and numerical approaches are applied to analyze die system behavior of various parameters. In particular, influence of wear on a periodic dynamics of the system is reported.
    Źródło:
    Acta Mechanica et Automatica; 2007, 1, 1; 11-14
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamical jump attenuation in a non-ideal system through a magnetorheological damper
    Autorzy:
    Piccirillo, V.
    Tusset, A. M.
    Balthazar, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/280364.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    magnetorheological damper
    Sommerfeld effect
    nonlinear dynamics
    Opis:
    This paper is concerned with the Sommerfeld effect (Jump phenomena) attenuation in an non-ideal mechanical oscillator connected with an unbalanced motor excitation with a limited power supply (non-ideal system) using a magnetorheological damper (MRD). The dynamical response of systems with MRD presents different behavior due to their nonlinear characteristic. MRD nonlinear response is associated with adaptive dissipation related to their hysteretic behavior. The Bouc-Wen mathematical model is used to represent the MRD behavior. Numerical simulations show different aspects about the Sommerfeld effect, illustrating the influence of the different electric current applied in the MRD to control the force developed by this damper.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2014, 52, 3; 595-604
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reduction of railway bridge vibration with groundhook mass damper
    Autorzy:
    Wcisło, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/115491.pdf
    Data publikacji:
    2012
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    mass damper
    bridge dynamics
    non-stationary loads
    Opis:
    The aim of this research is to compare eff ectiveness of an ordinary mass damper with a more complex one equipped with an extra spring element connecting the damper mass with the ground. For both simple- and nonlinear- primary structure models and for stable load state, theoretically effi ciency of both types of dampers is just the same therefore their effi ciencies in bridge structures subjected to non-stationary load are investigated.
    Źródło:
    Challenges of Modern Technology; 2012, 3, 4; 53-57
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of friction force and hysteresis on the dynamic responses of passive quarter-car suspension with linear and non-linear damper static characteristics
    Autorzy:
    Klockiewicz, Zbyszko
    Ślaski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2204625.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    vehicle vertical dynamics
    damper model
    friction
    hysteresis
    transfer function
    Opis:
    Vehicle passive suspensions consist of two major elements generating force – spring and passive damper. Both possess non-linear characteristics, which are quite often taken into account in simulations; however, the friction forces inside the hydraulic damper and the damping force’s hysteresis are usually left out. The researchers in this paper present the results of examination of the influence of using complex damper models – with friction and hysteresis; and with linear and non-linear static characteristics – on the chosen dynamic responses of a suspension system for excitations in the typical exploitation frequency range. The results from the simulation tests of the simplified and advanced versions of the damper model – different transfer functions and their relation to the reference model’s transfer functions – are compared. The main conclusion is that friction and hysteresis add extra force to the already existing damping force, acting similar to damping increase for the base static characteristics. But this increase is not linear – it is bigger for smaller frequencies than for higher frequencies. The research shows the importance of including non-linear characteristics and proposed modules in modelling passive dampers.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 2; 205--218
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of vehicle suspension dynamic responses for simplified and advanced adjustable damper models with friction, hysteresis and actuation delay for different comfort-oriented control strategies
    Autorzy:
    Klockiewicz, Zbyszko
    Ślaski, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2204668.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    vehicle vertical dynamics
    damper model
    friction
    hysteresis
    comfort-oriented control strategies
    Skyhook
    ADD
    PDD
    Opis:
    Throughout the years, many control strategies for adjustable dampers have been proposed, designed to boost the performance characteristics of a vehicle. Comfort control strategies such as Skyhook (SH), acceleration-driven damping or power-driven damping have been tested many times using simulation models of vehicles. Those tests, however, were carried out using simplified damper models – linear or simple bilinear with symmetric characteristics. This article presents the results of examination of the influence of using more complex damper models, with friction, hysteresis and time delay of state switching implemented, on the chosen dynamic responses of a suspension system for excitations in the typical exploitation frequency range. The results of the test are compared with those found in the literature and with the results of simulations performed with a simplified version of the advanced model used. The main conclusion is that friction and hysteresis add extra force to the already existing damping force, acting like a damping increase for all analysed control strategies. The actuation delays limit the effectiveness in a sense of comfort increasing to only some frequencies. The research shows the importance of including the proposed modules in testing for both adjustable and passive dampers.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 1--15
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient simulation of a squeeze film damped turbocharger rotor under consideration of fluid inertia and cavitation
    Autorzy:
    Drapatow, Thomas
    Alber, Oliver
    Woschke, Elmar
    Powiązania:
    https://bibliotekanauki.pl/articles/2090678.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotor dynamics
    journal bearings
    squeeze film damper
    fluid inertia
    dynamika wirnika
    łożysko ślizgowe
    bezwładność cieczy
    Opis:
    Squeeze film dampers (SFDs) are commonly used in turbomachinery in order to introduce external damping, thereby reducing rotor vibrations and acoustic emissions. Since SFDs are of similar geometry as hydrodynamic bearings, the REYNOLDS equation of lubrication can be utilised to predict their dynamic behaviour. However, under certain operating conditions, SFDs can experience significant fluid inertia effects, which are neglected in the usual REYNOLDS analysis. An algorithm for the prediction of these effects on the pressure build up inside a finite-length SFD is therefore presented. For this purpose, the REYNOLDS equation is extended with a first-order perturbation in the fluid velocities to account for the local and convective inertia terms of the NAVIER-STOKES equations. Cavitation is taken into account by means of a mass conserving two-phase model. The resulting equation is then discretized using the finite volume method and solved with an LU factorization. The developed algorithm is capable of calculating the pressure field, and thereby the damping force, inside an SFD for arbitrary operating points in a time-efficient manner. It is therefore suited for integration into transient simulations of turbo machinery without the need for bearing force coefficient maps, which are usually restricted to circular centralized orbits. The capabilities of the method are demonstrated on a transient run-up simulation of a turbocharger rotor with two semi-floating bearings. It can be shown that the consideration of fluid inertia effects introduces a significant shift of the pressure field inside the SFDs, and therefore the resulting damper force vector, at high oil temperatures and high rotational speeds. The effect of fluid inertia on the kinematic behaviour of the whole system on the other hand is rather limited for the examined rotor.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139201, s. 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of CFD to modeling of squeeze mode magnetorheological dampers
    Autorzy:
    Gołdasz, J.
    Sapiński, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/386699.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    magnetorheological fluid
    damper
    squeeze-mode
    computational fluid dynamics (CFD)
    mesh animation
    płyny magnetoreologiczne
    amortyzator
    tłumik
    dynamika płynów
    Opis:
    The so-called squeeze flow involves a magnetorheological (MR) fluid sandwiched between two planar surfaces setting up a flow channel. The height of the channel varies according to a prescribed displacement or force profile. When exposed to a magnetic field of sufficient strength MR fluids develop a yield stress. In squeeze-mode devices the yield stress varies with both the magnetic field magnitude and the channel height. In this paper an unsteady flow model of an MR fluid in squeeze mode is proposed. The model is developed in Ansys Fluent R16. The MR material flow model is based on the apparent viscosity approach. In order to investigate the material's behaviour the authors prepared a model of an idealized squeeze-mode damper in which the fluid flow is enforced by varying the height of the channel. Using mesh animation, the model plate is excited, and as the mesh moves, the fluid is squeezed out of the gap. In the simulations the model is subjected to a range of displacement inputs of frequencies from 10 to 20 Hz, and local yield stress levels up to 30 kPa. The results are presented in the form of time histories of the normal force on the squeezing plate and loops of force vs. displacement (velocity).
    Źródło:
    Acta Mechanica et Automatica; 2015, 9, 3; 129-134
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of parameters for a design of the stable electro-dynamic passive magnetic support of a high-speed flexible rotor
    Autorzy:
    Szolc, T.
    Falkowski, F.
    Henzel, M.
    Kurnyta-Mazurek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/201250.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    rotor dynamics
    electrodynamic passive magnetic bearings
    active magnetic damper
    stability analysis
    rotor- shaft system
    dynamika rotora
    wirnik
    amortyzator magnetyczny
    analiza stabilności
    pasywne łożysko magnetyczne
    Opis:
    Electro-dynamic passive magnetic bearings are now viewed as a feasible option when looking for support for high-speed rotors. Nevertheless, because of the skew-symmetrical visco-elastic properties of such bearings, they are prone to operational instability. In order to avoid this, the paper proposes the addition of external damping into the newly designed vibrating laboratory rotor-shaft system. This may be achieved by means of using simple passive dampers that would be found among the components of the electro-dynamic bearing housings along with magnetic dampers, which satisfy the operational principles of active magnetic bearings. Theoretical investigations are going to be conducted by means of a structural computer model of the rotor-shaft under construction, which will take into consideration its actual dimensions and material properties. The additional damping magnitudes required to stabilize the most sensitive lateral eigenmodes of the object under consideration have been determined by means of the Routh-Hurwitz stability criterion.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 91-105
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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