Sound insulation effect of magnetorheological fluid as a function of magnetic field strength and direction
Hao Cheng, Taeuk Lim, Sung‐Hoon Kim, Wonsuk Jung
Abstract
We developed a sound absorber using a magnetorheological fluid(MR-F) based on the density and alignment angle of carbonyl iron powder(CIP) chains by the controlling the magnetic field strength and direction. The magnetically arranged CIP lattice structure considerably influenced the sound transmission loss(STL). We used optical microscopy, energy-dispersive X-ray spectrometry, and X-ray diffraction to investigate the STL by varying the magnetic field strength from 0 to 40 mT and the angle from 0 to 30°. The STL was markedly increased (133%) owing to an ∼10-fold increased density and the CIP alignment. These results were verified using the developed MR-F porous model.
Topics & Concepts
Magnetorheological fluidMaterials scienceMagnetic fieldDiffractionPorosityField strengthComposite materialMagnetCarbonyl ironOpticsMechanical engineeringPhysicsQuantum mechanicsEngineeringVibration Control and Rheological FluidsFluid Dynamics and Vibration AnalysisAcoustic Wave Phenomena Research