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Magneto rheological Fluid Assisted Vibration Damping in Bi-Directional Composite Beam


Author(s):

Biju B , Department of Mechanical Engineering, Mar Athanasius College of Engineering,Ernakulam, Kerala, India. ; Rajendraprasad P, Department of Mechanical Engineering, Mar Athanasius College of Engineering,Ernakulam, Kerala, India. ; Ranjit Joy, Department of Mechanical Engineering, Mar Athanasius College of Engineering,Ernakulam, Kerala, India. ; Roshin Mathews George, Department of Mechanical Engineering, Mar Athanasius College of Engineering,Ernakulam, Kerala, India. ; Tony Varghese, Department of Mechanical Engineering, Mar Athanasius College of Engineering,Ernakulam, Kerala, India.

Keywords:

Magneto-rheological fluid, natural frequency, damping, finite element

Abstract:

In systems having mechanical vibrations, the amplitudes may vary from few nanometers to meters depending upon the system. Detrimental effects of vibration may be system failure, operational inefficiencies etc. Structural vibrations can be mitigated by different methods like stiffening, damping, isolation etc. The damping characteristics of a bi-directional composite beam subjected to vibration damping using magneto-rheological fluid are studied. Composite materials are made from two or more constituent materials with different properties, that when combined, produce a material with entirely different characteristics. By choosing appropriate combination of matrix and reinforcement material a new material can be made that exactly meets the requirement of a particular application. Magneto-rheological fluid (MR fluids) is colloidal suspension which can change from liquid to quasi-solid phase under the influence of external magnetic field. Small sized, magnetisable, ferrous particles contained in low permeability oil constitute a MR fluid. When external field is removed phase changes from solid to liquid. This behavior is used in damping.Magneto-rheological fluid layer is sandwiched between two composite beams and is properly sealed. It is then subjected to free vibration analysis considering the beam as cantilever. The natural frequencies of the beam corresponding to different modes are determined experimentally. The MR fluid sandwiched beam is subjected to magnetic field at different locations on the beam and the variations in natural frequencies are studied. It is observed that the maximum relative change in natural frequency is observed when the field is applied on both sides at the centre as well as the clamped end of the beam.


Other Details:

Manuscript Id :IJSTEV2I11080
Published in :Volume : 2, Issue : 11
Publication Date: 01/06/2016
Page(s): 158-161
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