Semi-active vibration control of MRF core PMC cantilever sandwich beams: Experimental study

Abstract

The semi-active vibration control of sandwich beams made of chopped strand mat glass fiber reinforced polyester resin polymer matrix composite (PMC) and magnetorheological fluid (MRF) core were experimentally investigated in this study. Two-, four- and six-layered glass fiber reinforced polyester resin polymer matrix composites were prepared using the hand-layup technique. The magnetorheological fluid was prepared in-house with 30% volume of carbonyl iron powder and 70% volume of silicone oil. Nine cantilever sandwich beams of varying thicknesses of the top and bottom layers glass fiber reinforced polyester resin polymer matrix composite beams and middle magnetorheological fluid core were prepared. The magnetorheological fluid core was activated with a non-homogeneous magnetic field using permanent magnets. The first three modes, natural frequencies and damping ratios of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams were determined through free vibration analysis using DEWESoft modal analysis software. The amplitude frequency response of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams through forced vibration analysis was determined using LabVIEW. The effect of various parameters such as magnetic flux density, thickness of glass fiber reinforced polyester resin polymer matrix composite layers and magnetorheological fluid core layer on the natural frequencies, damping ratio and vibration amplitude suppressions of the glass fiber reinforced polyester resin polymer matrix composite-magnetorheological fluid core sandwich beams was investigated. Based on the results obtained, 2 mm thickness top and bottom layers glass fiber reinforced polyester resin polymer matrix composite and 5 mm thickness magnetorheological fluid core sample have achieved a high shift in increased natural frequency, damping ratio and vibration amplitude suppression under the influence of magnetic flux density.

Characterization of an In-house Prepared MR Fluid and Vibrational Behaviour of Composite Sandwich Beam with MR Fluid Core

“…The results exhibited signi cant vibration suppression capabilities for the MR sandwich beams [26,27]. The experimental studies on the dynamic behavior of the MR uid sandwich beams with di erent composite face layers were conducted and the reasonable vibration amplitude reduction with the applied magnetic eld was observed [28,29]. To sum up the literature, there are very few studies documented on the rheological properties of the MR uid in the pre-yield region.…”

Study on operational temperature of magneto-rheological fluid and design dimensions of magneto-rheological damper for optimization

“…Rheological behaviour shows more chain formation in the direction of the applied magnetic field [2,3]. Moreover, MR fluid prepared with fumed silica shows more sedimentation stability than MR fluid without additive, and magnetic saturation is more significant than particle shape and size [4][5][6]. Typically, parallel plate gap, applied current, and volume fraction have a higher impact on the shear behaviour of the magnetic fluids [7].…”

Rheological Properties of the In-house Prepared Magneto-rheological Fluid in the Pre-yield Region

“…The straincontrolled rheometer was used to analyze the viscoelastic parameters of the MR fluids. The influence of particle size distribution, volume fraction percentage and applied field on the rheological parameters are reported [27][28][29][30][31][32][33][34][35][36]. Though few studies exist on commercially available MR fluids, the rheological tests on the in-house prepared MR fluids are important because they are cost-effective.…”