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Characterization of dynamic behaviour of a magnetorheological fluid in the shear mode under impact of the magnetic field

 
: Herlein, Ruslan

Carrera, E. ; Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren -IZFP-, Institutsteil Dresden; European Community on Computational Methods in Applied Science -ECCOMAS-:
6th ECCOMAS Thematic Conference on Smart Structures and Materials, SMART 2013 : Politecnico di Torino, 24-26 June 2013
Torino, 2013
12 S.
Thematic Conference on Smart Structures and Materials (SMART) <6, 2013, Torino>
Englisch
Konferenzbeitrag
Fraunhofer LBF ()
magneto-rheological fluid; parameter identification; transfer function

Abstract
Today, the applications which use the magneto-rheological fluids (MRF) as force/torque transfer medium capture more and more region in the engineering. The use of the magneto-rheological fluids spread out from damper and vibration absorber till clutch. In this work we analyzed and identified the dynamic behavior of the MRF. Precisely, we measured the frequency response of the transfer from torque to angular acceleration on a rheometer-like device and identified a parameter model as transfer function. During the measurement the induced magnetic field strength was varied. Thus we obtained transfer functions which depend not only of the frequency but also of the magnetic field strength. In addition to the formulation the transfer function by rational function with integer exponents, we used the formulation by that the exponents are rational numbers. A representation of this kind of the transfer functions in the time leads to the differential equations with the fractional derivatives. This formulation yields more flexibility in the amplitude and phase gain shaping. The constitutive equations have fractional derivative terms which physical interpretation is difficult. In standard formulation of the differential equations to achieve the flexibility of the amplitude and phase gain shaping one increases the derivative order. The terms of higher order have just as difficult physical interpretation.

: http://publica.fraunhofer.de/dokumente/N-266508.html