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1
Content available Observations of MR fluid clumping behaviour in a squeeze-mode damper
Sapiński B.
Acta Mechanica et Automatica
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2016
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Vol. 10, no. 3
239--245
EN
The study summarises the results of quasi-static experimental tests of an MR squeeze-mode damper prototype (MRSQD) performed at the MTS testing machine. Of particular interests was the influence of MR fluid clumping behaviour in the MRSQD working gap on the force output of the device. The MRSQD tests were assessed by measuring the damping force output at prescribed sinusoidal displacement inputs and at various (fixed) voltage levels resulting in the respective average current levels in the control coil. The influence of piston position offset on the damping force was also investigated. The collected data were shown in the form of damping force time histories and damping force-piston displacements loops and discussed with respect to MR fluid clumping behaviour.
2
Content available Theoretical analysis of magnetorheological damper characteristics in squeeze mode
Sapiński B.
Acta Mechanica et Automatica
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2015
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Vol. 9, no. 2
89--92
EN
The paper summarises the theoretical study of a magnetorheological (MR) damper operated in squeeze mode, intended to be used as an actuator in a semi-active mount system in a car motor. The structural design and operating principle of the damper are described and a simplified model of the MR fluid flow in the gap is presented. The plots of the damper force generated by the MR damper are obtained for monoharmonic piston motion with respect to the centre point of the gap height and in the conditions of the control coil being supplied with direct current.
3
Content available remote Analiza siły wibroizolatora z cieczą magnetoreologiczną działającą w trybie ściskania
Sapiński B., Krupa S.
Przegląd Elektrotechniczny
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2014
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R. 90, nr 12
87--90
PL
W pracy przeprowadzono analizę siły wytwarzanej przez wibroizolator z cieczą magnetoreologiczną (MR) działającą w trybie ściskania w stanach quasi-statycznych. Opisano budowę wibroizolatora i model ściskania cienkiej warstwy cieczy MR. Wyznaczono charakterystyki wibroizolatora. Te charakterystyki obrazują przebiegi czasowe siły wibroizolatora i jej składowych oraz zależności siły od przemieszczenia i prędkości tłoka przy stałych wartościach natężenia prądu w cewce sterującej oraz sinusoidalnych przemieszczeniach tłoka.
EN
The study summarises the quasi-static analysis of the damping force generated by a vibration isolator with magnetorheological (MR) fluid in the squeeze mode. The isolator’s structure is described and the model of a simple squeeze-film device is outlined. Force characteristics of the isolator were obtained, plotting, the time patterns of the force and its components determined under sine piston displacements and constant levels of input current in the control coil, as well as force-displacement and force-velocity loops.
4
Content available remote Analiza pola magnetycznego w wibroizolatorze z cieczą magnetoreologiczną działającą w trybie ściskania
Sapiński B., Matras A.
Przegląd Elektrotechniczny
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2014
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R. 90, nr 3
139--142
PL
Obiektem analizy był wibroizolator z cieczą magnetoreologiczną (MR) pracującą w trybie ściskania. Przedstawiono budowę i działanie wibroizolatora oraz wyniki obliczeń numerycznych pola magnetycznego w urządzeniu. Celem obliczeń było wyznaczenie rozkładu pola dla rozważanych wariantów konstrukcyjnych wibroizolatora, zależności składowej osiowej indukcji magnetycznej oraz indukcyjności cewki sterującej od wysokości szczeliny roboczej. Obliczenia przeprowadzono przy użyciu programu program Opera-2d.
EN
The present study investigates the behaviour of a magnetorheological (MR) vibroisolator operated in the squeeze mode. The structure design and operating principles of the vibroisolator are outlined and the results of numerical calculations of the magnetic field in the device are provided. The purpose of the numerical procedure was to find the magnetic field distribution for all considered design options of the device and to establish the dependence of the axial component of magnetic flux density and the inductance of the control coil on the slit height.
5
Content available CFD model of a magnetorheological fluid in squeeze mode
Sapiński B., Szczęch M.
Acta Mechanica et Automatica
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2013
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Vol. 7, no. 3
180--183
EN
The study briefly outlines a CFD model of a magnetorheological (MR) fluid operated in squeeze mode with a constant interface area using the CFD (Computational Fluid Dynamics) approach. The underlying assumption is that the MR fluid is placed between two surfaces of which at least one can be subject to a prescribed displacement or a force input. The widely employed Bingham model, which fails to take into account the yield stress variations depending on the height of the gap, has been modified. Computation data obtained in the ANSYS CFX environment are compared with experimental results.
6
Content available remote Magnetorheological flow, shear and squeeze mode vibration dampers
Sapiński B.
Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika
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2005
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z. 65 [222]
327-334
EN
The study is concerned with the development of magnetorheological (MR) flow, shear and squeeze mode vibration dampers (MR dampers), which has been a part of author's research program for two years. The composition and operating mechanism of MR fluids with an emphasis on modes used to construct MR vibration dampers are of the particular interest. Structures of MR flow and shear mode dampers, and selected results of their experimental tests are presented. Further research work focused on engineering of MR squeeze mode damper is announced.
7
Performance Investigation of Electrorheological Fluid-Based Mount for Vibration Isolation Using Optimal Controller
Tseng W.-K., Wu J.-D., Chen R.-J.
Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica
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2003
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T. 22, z. 3
455-462
EN
Electrorheological (ER) fluids is one of the most favorite actuator materials used in smart materials and structures due to its fast, reversible, controllable and continuous change of rheological properties. In this paper, an optimal electric field control technique for ER fluids in squeeze mode with broadband Vibration source is presented. The proposed controllers are equivalent approaches based on the 2-norm (H2) principle for minimizing broadband Vibration spectrum energy. Both of the theoretical derivation and experimental investigation are conducted in present study. In the theoretical derivation, an optimal damping coefficient of fundamental ER squeeze mode and numerical simulation from model are presented. In the experimental work, the relation of damping coefficients and electric fields are obtained from preliminary experiments. The optimal controller is designed with an optimal damping coefficient for minimize Vibration spectrum energy and implemented on an ER squeeze mode test platform. The experimental results indicate that the proposed controller is effective in suppressing broadband Vibration and yield minimal transmissibility spectrum.
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