Temat: active damper - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Vibration analysis of a half-car model with semi-active damping
Autorzy:: Ferdek, U.
Łuczko, J.
Tematy:: semi-active damper
vibration damping
car suspension
hysteresis; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279944.pdf Link otwiera się w nowym oknie
Opis:: In this paper, analysis of a half-car model with linear and nonlinear semi-active dampers is performed. Using Matlab-Simulink software, a response of the system to a harmonic excitation of variable frequency and to an impulse excitation is found. The effect of both the distribution of spring-supported mass and the asymmetry of the support on the frequency characteristics of velocities and displacements at the mounting points of the dampers are analyzed. Additionally, characteristics of forces generated by the semi-active dampers and the response of the system when crossing an obstacle are determined.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 2.

Tytuł:: Utilising water wave energy – technology profile
Autorzy:: Chybowski, L.
Kuźniewski, B.
Tematy:: wave energy
energy conversion
shore protection
mechanical motor
active damper; Pokaż więcej
Wydawca:: Akademia Morska w Szczecinie. Wydawnictwo AMSz
Powiązania:: https://bibliotekanauki.pl/articles/135591.pdf Link otwiera się w nowym oknie
Opis:: The use of wave energy was studied at the Maritime University of Szczecin. The two main subjects were wave-energy conversion and using wave energy to protect the seashore against the hazardous effects of extreme waves. A construction of new technologies were outlined. Future research and intended cooperation were presented.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 3.

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

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: Active and passive damping of vibrations by torsional damper during steady state motion of a power transmission system
aktywne i pasywne tłumienie drgań skrętnych podczas ruchu ustalonego układu napędowego
Autorzy:: Skup, Z.
Tematy:: active damping
vibrations
torsional damper
structural friction; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281117.pdf Link otwiera się w nowym oknie
Opis:: This paper presents a theoretical study of the process of damping of nonlinear vibrations in a two-mass model of a mechanical system with a torsion damper. The steady-state motion of the system subject to harmonic excitation is considered on the assumption of a uniform frequency and constant amplitude of the forcing torque. Simultaneous structural friction phenomena (passive damping) and the piezoelectric effect (active damping) are been considered as well. The problem is considered on the assumption of a uniform unit pressure distribution between the contacting surfaces of the friction discs and plunger. The aim of the analysis is to asses the influence of geometric parameters, external load, unit pressure and electric parameters on the resonance curves of the steady-state vibrations. The equations of motion of the examined system are solved by means of the Van der Pol method.
Praca dotyczy teoretycznego badania tłumienia drgań nieliniowych układu mechanicznego o dwóch stopniach swobody zawierającego tłumik drgań skrętnych. Rozważany jest ruch ustalony układu przy wymuszeniu harmonicznym z jednostajną częstością o stałej amplitudzie momentu wymuszającego. Uwzględniono tłumienie drgań jednocześnie poprzez zjawisko tarcia konstrukcyjnego (tłumienie pasywne) i elementy piezoelektryczne (tłumienie aktywne). Zagadnienie rozpatrywane jest przy założeniu równomiernego rozkładu nacisków jednostkowych występujących pomiędzy współpracującymi powierzchniami tarcz ciernych i bezwładnika. Zbadano wpływ parametrów geometrycznych układu, nacisku jednostkowego, obciążenia zewnętrznego oraz parametrów elektrycznych na krzywe rezonansowe drgań ustalonych. Równania ruchu badanego układu mechanicznego rozwiązano metodą Van der Pola.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Semi-active vibration control of horizontal seat suspension by using magneto-rheological damper
Autorzy:: Maciejewski, Igor
Krzyżyński, Tomasz
Pecolt, Sebastian
Chamera, Sebastian
Tematy:: vibration isolation
MR damper
semi-active control; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281497.pdf Link otwiera się w nowym oknie
Opis:: In this paper, the modelling process and control strategy of a semi-active seat suspension with a magneto-rheological damper (MR) is presented. The proposed system should protect operators of working machines against vibration in the horizontal direction. The control algorithm mimics the desired force that might be introduced into the seat suspension actively. The model parameters are determined experimentally as a function of the control current. The elaborated system is tested by using an electro-hydraulic shaker that generates vibrations for the semi-active seat suspension with the seated human body. Power spectral densities and transmissibility functions are presented as the results of simulations and measurements. In addition, transmissibility factors and maximum relative displacements of the suspension are evaluated for both the conventional passive seat suspension and the semi-active system with an MR damper.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 6.

Tytuł:: Design and development of a semi-active suspension system for a quarter car model using PI controller
Autorzy:: Siswoyo, H.
Mir-Nasiri, N.
Ali, M. H.
Tematy:: semi-active suspension
control
damper
road profile
vibration; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Powiązania:: https://bibliotekanauki.pl/articles/385074.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the design and development of a semi-active suspension system for a vehicle. The main idea is to develop a system that is able to damp vibration of the vehicle body while crossing the bumps on the road. This system is modeled for a single wheel assembly and then the laboratory prototype of the complete system has been manufactured. It is used to physically simulate the spring-mass-damper system in vehicle and observe the frequency response to the external disturbances. The developed low-cost smart experimental equipment consists of a motor with offset mass which works as an oscillator to induce vibration, a spring-mass-damper system where the variable damper works as a pneumatic cylinder that allows varying the damping constant (c). Proportional-Integral (PI) controller is used to control the damping properties of the semi-active suspension system automatically. The system is designed in contrast to the most of the available suspension systems in the market that have only passive damping properties. The results of this research demonstrate the efficiency of the developed variable damper-based control system for the vehicle suspension system.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: Damping parameters of suspension of passenger vehicle equipped with semi-active dampers with by-pass valve
Parametry tłumienia zawieszenia samochodu osobowego wyposażonego w amortyzatory półaktywne z zaworem obejściowym
Autorzy:: Ślaski, G.
Tematy:: półaktywne zawieszenie
charakteryzacja tłumika
stosunek tłumienia
semi-active suspension
damper characteristic
damping ratio; Pokaż więcej
Wydawca:: Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Powiązania:: https://bibliotekanauki.pl/articles/374847.pdf Link otwiera się w nowym oknie
Opis:: The paper presents results of experimental tests of characteristics of semi-active dampers with by-pass valve and results of calculations evaluating suspension damping ratio taking into consideration also installation ratio and vehicle sprung mass changes. The asymmetry of damper characteristic is also investigated and changes in damper damping coefficients versus damper velocity. The papers also compares these values of passive damper used in this car with tested semi-active damper.
Artykuł prezentuje wyniki badań eksperymentalnych amortyzatorów półaktywnych z zaworem obejściowym, a także wyniki obliczeń oszacowujących bezwymiarowy współczynnik tłumienia zawieszenia z uwzględnieniem przełożenia kinematycznego zawieszenia oraz zmian masy resorowanej pojazdu. Rozpatrzono także asymetrię charakterystyki amortyzatora oraz zmiany współczynnika tłumienia amortyzatora w funkcji prędkości jego pracy. Artykuł porównuje także te wartości dla amortyzatora pasywnego używanego w tym samochodzie z amortyzatorem półaktywnym.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 8.

Tytuł:: Semiactive vibration reduction of operator’s seat with the use of controlled magnetorheological damper
Autorzy:: Chwastek, S.
Kozioł, P.
Tematy:: seats suspensions
mobile machines
magnetorheological damper
semi-active methods
controlled suspension
reduction of vibration; Pokaż więcej
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Powiązania:: https://bibliotekanauki.pl/articles/241873.pdf Link otwiera się w nowym oknie
Opis:: Low speeds of mobile heavy machines makes that the force derived from rough roads cause intense excitation of low frequency vibration, the reduction of which is possible only by active or semi active methods. In conditions of low frequency, the energy dissipation in the tire reduces the vibration intensity in a minor degree only magnetorheological dampers are free from this defect, which they properties changing under influence an electric field functioning on ferromagnetic particles of oil suspension. A controlling coil current, which is mounted in the damper piston, could control density of magnetic field lines (magnetic field intensity) directly in viscous hole of piston, and hence viscous drag force. Electric energy needed to control magnetorheological damper is generally available in each of mobile heavy machines. Simulation tests were performed to investigate effectiveness and stability of the proposed solution and the results were deemed satisfactory. The system was found to be feasible and implementable with respect to every parameter. The purpose of this study was to develop a simulation model of the semi active suspensions of operator’s seat based on magnetorheological damper, and to examine the effectiveness of using different control strategies.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 9.

Tytuł:: Semi-active suboptimal control strategy applied to periodically vibrating mechanical systems
Autorzy:: Miachajłow, M.
Szolc, T.
Tematy:: vibrations
semi-active damping
optimal control
magnethorheological damper
drgania
tłumienie półaktywne
kontrola optymalna
tłumik magnetoreologiczny; Pokaż więcej
Wydawca:: Instytut Podstawowych Problemów Techniki PAN
Powiązania:: https://bibliotekanauki.pl/articles/31343112.pdf Link otwiera się w nowym oknie
Opis:: The aim of this paper is to present the new method for obtaining the semi-active suboptimal control strategy, used for the purpose of vibration reduction in mechanical systems. The method is dedicated to systems where vibrations are of a periodic type. Generally, many semi-active control strategies have been developed up to date, but it seems that none of them are applied directly to the problem of mechanical systems suffering from disadvantageous, periodical vibrations. Probably, the reason why there were no such attempts in the past is that the semi-active vibration damping methods most often were used in situations where systems experience a finite time transient excitation, like for example seismic activity. In a case of systems experiencing repeatable (periodic), steady-state vibrations, such as machines or vehicles working at their nominal conditions, the common approach was to use the passive methods rather than the semi-active ones. This situation is changing nowadays and attempts of using semi-active methods to attenuate the disadvantageous steady state vibrations in machines and vehicles are becoming more common and successful. Therefore, there has been observed a surge in developing of the general purpose methods for determination of the optimal control strategies for such applications. The described method aspires to be the one of possible alternatives.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 10.

Tytuł:: Comparing the performance of using a smart damper in a semi-active suspension instead of a traditional damper using MATLAB/Simulink
Autorzy:: Ali, Lamyaa Mahdi
Al-Zughaibi, Ali I.
Tematy:: tłumik magnetoreologiczny
aktywny układ zawieszenia
pasywny układ zawieszenia
magnetorheological damper
passive
quarter car
semi-active
system feedback controller; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/59123660.pdf Link otwiera się w nowym oknie
Opis:: Given the importance of comfort and safety in various driving circumstances, the suspension system emerges as the most crucial component. Two different suspension systems, passive (PSS) and semi-active (SASS), are compared for effectiveness in this research. MATLAB/Simulink is used for simulation, employing a representative two-degree-of-freedom car model to evaluate and compare the performance results of these systems. The differential equations of motion for the two systems are modeled and simulated using software, which illuminates how they would behave under the same parameters and circumstances. Additionally, a Magnetorheological damper (MR) model with a ¼ vehicle system is used to evaluate its behavior on various types of roads, including those with steps, bumps, and random inputs. This study utilizes the Bingham plastic model to compare the simulation results of SASS and PSS systems. After comparing the numerical and graphical results from the two systems, it is observed that SASSs with controllers perform better than PSSs in terms of suspension adjustment and response time. The SASS is superior to the PSS in suppressing oscillations by 55.12%, 77.47%, and 86.78% for step input, bump, and random inputs, respectively. Additionally, the SASS is faster in eliminating oscillations compared to the PSS by 54% and 51.7% for step input and bump inputs, respectively.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Informacja

Wyszukujesz frazę "active damper" wg kryterium: Temat