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Numerical study of a two-way MR mount in squeeze-mode

Gołdasz J., Sapiński B.

Czasopismo Techniczne. Elektrotechnika

2016

Y. 113, iss. 2-E

29--40

In the paper, the authors present the results of a numerical study of a magnetorheological (MR) damper prototype operating in the so-called squeeze mode. The analyzed prototype allows achieving a symmetrical response in both directions of piston motion. The authors show the results of magnetostatic analyses of the electro-magnetic circuit of the device and lumped parameter model using calculations of the control circuit and the damping force output.

W artykule przedstawiono wyniki obliczeń prototypowej konstrukcji tłumika z cieczą MR działającej w trybie ściskania. Analizowany prototyp pozwala uzyskać identyczny zakres sił tłumienia w obu kierunkach ruchu. Autorzy prezentują osiągi tłumika oszacowane na podstawie obliczeń polowych oraz obliczeń z wykorzystaniem modelu o parametrach skupionych.

Application of CFD to modeling of squeeze mode magnetorheological dampers

Gołdasz J., Sapiński B.

Acta Mechanica et Automatica

2015

Vol. 9, no. 3

129--134

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).