Temat: damper dynamics - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Parameters identification of Bodner-Partom model for fluid in MR damper
Autorzy:: Skalski, P.
Woźnica, K.
Bajkowski, J.
Tematy:: dynamika
tłumik magnetoreologiczny
dynamika amortyzatora
dynamic
damper dynamics
magnetorheological damper
damper; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/387208.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: O wpływie zużycia na dynamikę tłumika drgań
On the wear influence on a damper dynamics
Autorzy:: Awrejcewicz, J.
Fyrev, Y.
Tematy:: analiza matematyczna
model matematyczny
tarcie
tłumienie drgań
mathematical model
mathematical analysis
vibration damping
damper dynamics; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/386610.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dynamical jump attenuation in a non-ideal system through a magnetorheological damper
Autorzy:: Piccirillo, V.
Tusset, A. M.
Balthazar, J. M.
Tematy:: magnetorheological damper
Sommerfeld effect
nonlinear dynamics; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/280364.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Reduction of railway bridge vibration with groundhook mass damper
Autorzy:: Wcisło, M.
Tematy:: mass damper
bridge dynamics
non-stationary loads; Pokaż więcej
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Powiązania:: https://bibliotekanauki.pl/articles/115491.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Analysis of dynamic characteristics of a sealed ends squeeze film damper considering the fluid inertia force
Autorzy:: Zhou, Hai Lun
Cang, Yang Guang
Zhang, Yu Qi
Guo, Chao
Tematy:: squeeze film damper
fluid inertia
computational fluid dynamics
damping
stiffness; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/59114484.pdf Link otwiera się w nowym oknie
Opis:: In order to effectively calculate dynamic characteristics of a sealed ends squeeze film damper (SFD) under the influence of the inertial force, a computational fluid dynamics model of the sealed ends SFD is established. The fluid inertia coefficient of SFD is investigated by using an energy approximation method. Both the theoretical calculation and numerical simulation are conducted to analyze the effects of eccentricity ratio and whirling frequency on stiffness and damping. In this research, the oil film inertia force of the sealed ends SFD is solved by using long bearing approximation (LBA) theory, which provides guidance for the design and application of the sealed ends SFD.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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
Tematy:: vehicle vertical dynamics
damper model
friction
hysteresis
transfer function; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/2204625.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Transient simulation of a squeeze film damped turbocharger rotor under consideration of fluid inertia and cavitation
Autorzy:: Drapatow, Thomas
Alber, Oliver
Woschke, Elmar
Tematy:: rotor dynamics
journal bearings
squeeze film damper
fluid inertia
dynamika wirnika
łożysko ślizgowe
bezwładność cieczy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2090678.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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
Tematy:: vehicle vertical dynamics
damper model
friction
hysteresis
comfort-oriented control strategies
Skyhook
ADD
PDD; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/2204668.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Application of CFD to modeling of squeeze mode magnetorheological dampers
Autorzy:: Gołdasz, J.
Sapiński, B.
Tematy:: magnetorheological fluid
damper
squeeze-mode
computational fluid dynamics (CFD)
mesh animation
płyny magnetoreologiczne
amortyzator
tłumik
dynamika płynów; Pokaż więcej
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Powiązania:: https://bibliotekanauki.pl/articles/386699.pdf Link otwiera się w nowym oknie
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).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

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.
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; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/201250.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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